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Cover Page - shares	6 Months Ended
Cover Page - shares	Jun. 30, 2019	Aug. 01, 2019
Cover page.
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Jun. 30, 2019
Document Transition Report	false
Entity File Number	1-07908
Entity Registrant Name	ADAMS RESOURCES & ENERGY, INC.
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	74-1753147
Entity Address, Address Line One	17 South Briar Hollow Lane
Entity Address, Address Line Two	Suite 100
Entity Address, City or Town	Houston
Entity Address, State or Province	TX
Entity Address, Postal Zip Code	77027
City Area Code	713
Local Phone Number	881-3600
Title of 12(b) Security	Common Stock
Trading Symbol	AE
Security Exchange Name	NYSEAMER
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Accelerated Filer
Entity Small Business	true
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Common Stock, Shares Outstanding		4,233,587
Document Fiscal Year Focus	2019
Entity Central Index Key	0000002178
Current Fiscal Year End Date	--12-31
Document Fiscal Period Focus	Q2
Amendment Flag	false

UNAUDITED CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Current assets:
Cash and cash equivalents	$ 127,670	$ 117,066
Restricted cash	4,876	0
Accounts receivable, net of allowance for doubtful accounts of $117 and $153, respectively	74,499	85,197
Accounts receivable – related party	0	425
Inventory	19,977	22,779
Derivative assets	240	162
Income tax receivable	2,217	2,404
Prepayments and other current assets	1,828	1,557
Total current assets	231,307	229,590
Property and equipment, net	55,555	44,623
Operating lease right-of-use assets	10,093
Intangible assets	1,936	0
Cash deposits and other assets	2,873	4,657
Total assets	301,764	278,870
Current liabilities:
Accounts payable	116,983	116,068
Accounts payable – related party	6	29
Derivative liabilities	236	139
Current portion of finance lease obligations	2,116	883
Current portion of operating lease liabilities	2,097
Other current liabilities	9,913	6,148
Total current liabilities	131,351	123,267
Other long-term liabilities:
Asset retirement obligations	1,550	1,525
Finance lease obligations	5,473	3,209
Operating lease liabilities	7,999
Deferred taxes and other liabilities	5,283	4,271
Total liabilities	151,656	132,272
Commitments and contingencies (Note 14)
Shareholders’ equity:
Preferred stock - $1.00 par value, 960,000 shares authorized, none outstanding	0	0
Common stock - $0.10 par value, 7,500,000 shares authorized, 4,233,587 and 4,217,596 shares outstanding, respectively	423	422
Contributed capital	12,497	11,948
Retained earnings	137,188	134,228
Total shareholders’ equity	150,108	146,598
Total liabilities and shareholders’ equity	$ 301,764	$ 278,870

UNAUDITED CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Current assets:
Allowance for doubtful accounts	$ 117	$ 153
Shareholders’ equity:
Preferred stock - par value (in dollars per share)	$ 1.00	$ 1.00
Preferred stock - shares authorized (in shares)	960,000	960,000
Preferred stock - shares outstanding (in shares)	0	0
Common stock - par value (in dollars per share)	$ 0.10	$ 0.10
Common stock - shares authorized (in shares)	7,500,000	7,500,000
Common stock - shares outstanding (in shares)	4,233,587	4,217,596

UNAUDITED CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Revenues:
Total revenues	$ 484,433	$ 452,417	$ 929,601	$ 839,673
Costs and expenses:
General and administrative	2,582	2,284	5,266	4,567
Depreciation and amortization	4,284	2,262	7,873	4,674
Total costs and expenses	485,076	448,119	924,991	834,298
Operating (losses) earnings	(643)	4,298	4,610	5,375
Other income (expense):
Gain on dissolution of investment	75	0	573	0
Interest income	731	498	1,387	885
Interest expense	(117)	(15)	(182)	(34)
Total other income (expense), net	689	483	1,778	851
Earnings before income taxes	46	4,781	6,388	6,226
Income tax provision	(40)	(1,161)	(1,474)	(1,468)
Net earnings	$ 6	$ 3,620	$ 4,914	$ 4,758
Earnings per share:
Basic net earnings per common share (in dollars per share)	$ 0	$ 0.86	$ 1.16	$ 1.13
Diluted net earnings per common share (in dollars per share)	0	0.86	1.16	1.13
Dividends per common share (in dollars per share)	$ 0.24	$ 0.22	$ 0.46	$ 0.44
Marketing
Revenues:
Total revenues	$ 467,040	$ 438,791	$ 896,801	$ 812,429
Costs and expenses:
Cost of goods and services sold	463,774	431,683	884,315	800,866
Transportation
Revenues:
Total revenues	17,393	13,626	32,800	27,244
Costs and expenses:
Cost of goods and services sold	$ 14,436	$ 11,890	$ 27,537	$ 24,191

UNAUDITED CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018
Operating activities:
Net earnings	$ 4,914	$ 4,758
Adjustments to reconcile net earnings to net cash provided by operating activities:
Depreciation and amortization	7,873	4,674
Gains on sales of property	(434)	(446)
Provision for doubtful accounts	(36)	(32)
Stock-based compensation expense	197	3
Deferred income taxes	1,012	(832)
Net change in fair value contracts	19	(3)
Gain on dissolution of AREC	(573)	0
Changes in assets and liabilities:
Accounts receivable	11,812	2,852
Accounts receivable/payable, affiliates	(23)	0
Inventories	2,802	(9,321)
Income tax receivable	187	1,317
Prepayments and other current assets	(271)	67
Accounts payable	1,505	15,634
Accrued liabilities	3,765	2,441
Other	999	125
Net cash provided by operating activities	33,748	21,237
Investing activities:
Property and equipment additions	(13,121)	(2,728)
Asset acquisition	(5,611)	0
Proceeds from property sales	1,287	655
Proceeds from dissolution of AREC	998	0
Insurance and state collateral (deposits) refunds	774	465
Net cash used in investing activities	(15,673)	(1,608)
Financing activities:
Principal repayments of finance lease obligations	(651)	(167)
Dividends paid on common stock	(1,944)	(1,856)
Net cash used in financing activities	(2,595)	(2,023)
Increase in cash and cash equivalents, including restricted cash	15,480	17,606
Cash and cash equivalents, including restricted cash, at beginning of period	117,066	109,393
Cash and cash equivalents, including restricted cash, at end of period	$ 132,546	$ 126,999

UNAUDITED CONDENSED CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY - USD ($) $ in Thousands	Total	Common Stock	Contributed Capital	Retained Earnings
Beginning balance at Dec. 31, 2017	$ 147,119	$ 422	$ 11,693	$ 135,004
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net earnings	1,138			1,138
Dividends declared:
Common stock, $0.22/share	(928)			(928)
Ending balance at Mar. 31, 2018	147,329	422	11,693	135,214
Beginning balance at Dec. 31, 2017	147,119	422	11,693	135,004
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net earnings	4,758
Ending balance at Jun. 30, 2018	150,024	422	11,696	137,906
Beginning balance at Mar. 31, 2018	147,329	422	11,693	135,214
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net earnings	3,620			3,620
Stock-based compensation expense	3		3
Dividends declared:
Common stock, $0.22/share	(928)			(928)
Ending balance at Jun. 30, 2018	150,024	422	11,696	137,906
Beginning balance at Dec. 31, 2018	146,598	422	11,948	134,228
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net earnings	4,908			4,908
Stock-based compensation expense	123		123
Dividends declared:
Common stock, $0.22/share	(928)			(928)
Awards under LTIP, $0.22/share	(2)			(2)
Ending balance at Mar. 31, 2019	150,699	422	12,071	138,206
Beginning balance at Dec. 31, 2018	146,598	422	11,948	134,228
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net earnings	4,914
Ending balance at Jun. 30, 2019	150,108	423	12,497	137,188
Beginning balance at Mar. 31, 2019	150,699	422	12,071	138,206
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net earnings	6			6
Stock-based compensation expense	74		74
Issuance of common shares for acquisition	392	1	391
Cancellation of shares withheld to cover taxes upon vesting of restricted awards	(39)		(39)
Dividends declared:
Common stock, $0.22/share	(1,016)			(1,016)
Awards under LTIP, $0.22/share	(8)			(8)
Ending balance at Jun. 30, 2019	$ 150,108	$ 423	$ 12,497	$ 137,188

- Definition

The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

+ References + Details

UNAUDITED CONDENSED CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY (Parenthetical) - $ / shares	3 Months Ended
	Jun. 30, 2019	Mar. 31, 2019
Statement of Stockholders' Equity [Abstract]
Dividends per common share (in dollars per share)	$ 0.24	$ 0.22
Awards under LTIP (in dollars per share)	$ 0.24	$ 0.22

Organization and Basis of Presentation	6 Months Ended
Organization and Basis of Presentation	Jun. 30, 2019
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Organization and Basis of Presentation	Organization and Basis of Presentation Organization Adams Resources & Energy, Inc. (“AE”) is a publicly traded Delaware corporation organized in 1973, the common shares of which are listed on the NYSE American LLC under the ticker symbol “AE”. We, through our subsidiaries, are primarily engaged in the business of crude oil marketing, transportation and storage in various crude oil and natural gas basins in the lower 48 states of the United States (“U.S.”). We also conduct tank truck transportation of liquid chemicals and dry bulk primarily in the lower 48 states of the U.S. with deliveries into Canada and Mexico, and with terminals in the Gulf Coast region of the U.S. Unless the context requires otherwise, references to “we,” “us,” “our,” the “Company” or “AE” are intended to mean the business and operations of Adams Resources & Energy, Inc. and its consolidated subsidiaries. We operate and report in two business segments: (i) crude oil marketing, transportation and storage, and (ii) tank truck transportation of liquid chemicals and dry bulk. Basis of Presentation Our results of operations for the three and six months ended June 30, 2019 are not necessarily indicative of results expected for the full year of 2019. In the opinion of management, the accompanying unaudited condensed consolidated financial statements reflect all adjustments consisting of normal recurring accruals necessary for fair presentation. The condensed consolidated financial statements and the accompanying notes are prepared in accordance with U.S. generally accepted accounting principles (“GAAP”) for interim financial statements and the rules of the U.S. Securities and Exchange Commission (“SEC”). Certain information and footnote disclosures required by GAAP for complete annual financial statements have been omitted and, therefore, these interim financial statements should be read in conjunction with our audited consolidated financial statements included in our Annual Report on Form 10-K for the year ended December 31, 2018 (the “2018 Form 10-K”) filed with the SEC on March 8, 2019. All significant intercompany transactions and balances have been eliminated in consolidation. Use of Estimates The preparation of our financial statements in conformity with GAAP requires management to use estimates and assumptions that affect the reported amount of assets and liabilities and disclosure of contingent assets and liabilities at the date of the financial statements and the reported amounts of revenues and expenses during the reporting period. We base our estimates and judgments on historical experience and on various other assumptions and information we believe to be reasonable under the circumstances. Estimates and assumptions about future events and their effects cannot be perceived with certainty and, accordingly, these estimates may change as new events occur, as more experience is acquired, as additional information is obtained and as the operating environment changes. While we believe the estimates and assumptions used in the preparation of these condensed consolidated financial statements are appropriate, actual results could differ from those estimates.

Summary of Significant Accounting Policies

6 Months Ended

Jun. 30, 2019

Accounting Policies [Abstract]

Summary of Significant Accounting Policies

Cash, Cash Equivalents and Restricted Cash

Restricted cash represents an amount held in a segregated bank account by Wells Fargo as collateral for amounts outstanding under our letter of credit facility. In June 2019, the amount of outstanding letters of credit under our letter of credit facility exceeded the borrowing base as defined in the letter of credit facility agreement. As a result, we were required to deposit cash with the lender as security for the outstanding letters of credit. See “Letter of Credit Facility” within this Note 2 for further information. Our borrowing base is based on our net receivable balance, and due to customer prepayments, our borrowing base as outlined in the letter of credit facility did not fully

support the outstanding letters of credit that have been issued. As a result, on July 1, 2019, we canceled the letter of credit facility, and secured the outstanding letters of credit with our restricted cash balance.

The following table provides a reconciliation of cash and cash equivalents and restricted cash as reported with the unaudited condensed consolidated balance sheet that totals to the amounts shown in the unaudited condensed consolidated statements of cash flow (in thousands):


	June 30,
	2019

Cash and cash equivalents	$	127,670
Restricted cash	4,876
Total cash, cash equivalents and restricted cash shown in the
unaudited condensed consolidated statements of cash flow	$	132,546

Earnings Per Share

Basic earnings (losses) per share is computed by dividing our net earnings (losses) by the weighted average number of shares of common stock outstanding during the period. Diluted earnings (losses) per share is computed by giving effect to all potential shares of common stock outstanding, including our stock related to unvested restricted stock unit awards. Unvested restricted stock unit awards granted under the Adams Resources & Energy, Inc. 2018 Long-Term Incentive Plan (“2018 LTIP”) are not considered to be participating securities as the holders of these shares do not have non-forfeitable dividend rights in the event of our declaration of a dividend for common shares (see Note 10 for further discussion).

A reconciliation of the calculation of basic and diluted earnings per share is as follows (in thousands, except per share data):


	Three Months Ended June 30,						Six Months Ended June 30,

	2019		2018		2019		2018
Earnings per share — numerator:
Net earnings	$	6	$	3,620	$	4,914	$	4,758

Denominator:
Basic weighted average number of shares outstanding	4,227		4,218		4,223		4,218

Basic earnings per share	$	—	$	0.86	$	1.16	$	1.13

Diluted earnings per share:
Diluted weighted average number of shares outstanding:
Common shares	4,227		4,218		4,223		4,218
Restricted stock unit awards	—		—		6		—
Performance share unit awards⁽¹⁾	—		—		—		—
Total	4,227		4,218		4,229		4,218

Diluted earnings per share	$	—	$	0.86	$	1.16	$	1.13

_______________

(1) The dilutive effect of performance share awards are included in the calculation of diluted earnings per share when the performance share award performance conditions have been achieved. The performance conditions for the performance share unit awards granted in 2018 were achieved as of December 31, 2018. For the three and six months ended June 30, 2019, the effect of the performance share awards on earning per share is anti-dilutive.

Fair Value Measurements

The carrying amounts reported in the unaudited condensed consolidated balance sheets for cash and cash equivalents, accounts receivable and accounts payable approximates fair value because of the immediate or short-term maturity of these financial instruments. Marketable securities are recorded at fair value based on market quotations from actively traded liquid markets.

A three-tier hierarchy has been established that classifies fair value amounts recognized in the financial statements based on the observability of inputs used to estimate these fair values. The hierarchy considers fair value amounts based on observable inputs (Levels 1 and 2) to be more reliable and predictable than those based primarily on unobservable inputs (Level 3). At each balance sheet reporting date, we categorize our financial assets and liabilities using this hierarchy.

Fair value contracts consist of derivative financial instruments and are recorded as either an asset or liability measured at its fair value. Changes in fair value are recognized immediately in earnings unless the derivatives qualify for, and we elect, cash flow hedge accounting. We had no contracts designated for hedge accounting during any current reporting periods (see Note 10 for further information).

Income Taxes

Income taxes are accounted for using the asset and liability method. Under this approach, deferred tax assets and liabilities are recognized based on anticipated future tax consequences attributable to differences between financial statement carrying amounts of these items and their respective tax basis.

Letter of Credit Facility

We maintained a Credit and Security Agreement with Wells Fargo Bank, National Association to provide for the issuance of up to $60.0 million in stand-by letters of credit primarily used to support crude oil purchases within our crude oil marketing segment and for other purposes. We used the letter of credit facility for letters of credit related to our insurance program. This facility was collateralized by the eligible accounts receivable within our crude oil marketing segment and expires on August 30, 2019.

The issued stand-by letters of credit were canceled as the underlying purchase obligations were satisfied by cash payment when due. The letter of credit facility placed certain restrictions on GulfMark Energy, Inc., one of our wholly owned subsidiaries. These restrictions included the maintenance of positive net earnings excluding inventory valuation changes, as defined, among other restrictions. At June 30, 2019 and December 31, 2018, we had $4.6 million and $4.6 million, respectively, of letters of credit outstanding under this facility. On July 1, 2019, we canceled the letter of credit facility, and secured the outstanding letters of credit with our restricted cash balance.

Property and Equipment

Property and equipment is recorded at cost. Expenditures for additions, improvements and other enhancements to property and equipment are capitalized, and minor replacements, maintenance and repairs that do not extend asset life or add value are charged to expense as incurred. When property and equipment assets are retired or otherwise disposed of, the related cost and accumulated depreciation is removed from the accounts and any resulting gain or loss is included in results of operations in operating costs and expenses for the respective period. Property and equipment, except for land, is depreciated using the straight-line method over the estimated average useful lives ranging from two to thirty-nine years.

We review our long-lived assets for impairment whenever there is evidence that the carrying value of these assets may not be recoverable. Any impairment recognized is permanent and may not be restored. Property and equipment is reviewed at the lowest level of identifiable cash flows. For properties requiring impairment, the fair value is estimated based on an internal discounted cash flow model of future cash flows.

See Note 5 for additional information regarding our property and equipment.

Stock-Based Compensation

We measure all share-based payments, including the issuance of restricted stock units and performance share units to employees and board members, using a fair-value based method. The cost of services received from employees and non-employee board members in exchange for awards of equity instruments is recognized in the consolidated statement of operations based on the estimated fair value of those awards on the grant date and amortized on a straight-line basis over the requisite service period. The fair value of restricted stock unit awards and performance share unit awards is based on the closing price of our common stock on the grant date. We account for forfeitures as they occur. See Note 11 for additional information regarding our 2018 LTIP.

Common Shares Outstanding

The following table reconciles our outstanding common stock for the periods indicated:


						Common
						shares

Balance, January 1, 2019						4,217,596
Vesting of restricted stock unit awards						375
Balance, March 31, 2019						4,217,971
Issuance of shares in acquisition (see Note 6)						11,145
Vesting of restricted stock unit awards (see Note 11)						5,354
Shares withheld to cover taxes upon vesting of restricted stock unit awards						(883)
Balance, June 30, 2019						4,233,587

Revenue Recognition

6 Months Ended

Jun. 30, 2019

Revenue from Contract with Customer [Abstract]

Revenue Recognition

Revenue Disaggregation

The following table disaggregates our revenue by segment and by major source for the periods indicated (in thousands):


	Reporting Segments
	Marketing		Transportation		Total

Three Months Ended June 30, 2019
Revenues from contracts with customers	$	390,407	$	17,393	$	407,800
Other ⁽¹⁾	76,633		—		76,633
Total revenues	$	467,040	$	17,393	$	484,433

Timing of revenue recognition:
Goods transferred at a point in time	$	390,407	$	—	$	390,407
Services transferred over time	—		17,393		17,393
Total revenues from contracts with customers	$	390,407	$	17,393	$	407,800

Three Months Ended June 30, 2018
Revenues from contracts with customers	$	419,365	$	13,626	$	432,991
Other ⁽¹⁾	19,426		—		19,426
Total revenues	$	438,791	$	13,626	$	452,417

Timing of revenue recognition:
Goods transferred at a point in time	$	419,365	$	—	$	419,365
Services transferred over time	—		13,626		13,626
Total revenues from contracts with customers	$	419,365	$	13,626	$	432,991

Six Months Ended June 30, 2019
Revenues from contracts with customers	$	751,138	$	32,800	$	783,938
Other ⁽¹⁾	145,663		—		145,663
Total revenues	$	896,801	$	32,800	$	929,601

Timing of revenue recognition:
Goods transferred at a point in time	$	751,138	$	—	$	751,138
Services transferred over time	—		32,800		32,800
Total revenues from contracts with customers	$	751,138	$	32,800	$	783,938

Six Months Ended June 30, 2018
Revenues from contracts with customers	$	779,450	$	27,244	$	806,694
Other ⁽¹⁾	32,979		—		32,979
Total revenues	$	812,429	$	27,244	$	839,673

Timing of revenue recognition:
Goods transferred at a point in time	$	779,450	$	—	$	779,450
Services transferred over time	—		27,244		27,244
Total revenues from contracts with customers	$	779,450	$	27,244	$	806,694

_______________

(1) Other marketing revenues are recognized under ASC 815, Derivatives and Hedging, and ASC 845, Nonmonetary Transactions – Purchases and Sales of Inventory with the Same Counterparty.

Other Marketing Revenue

Certain of the commodity purchase and sale contracts utilized by our crude oil marketing business qualify as derivative instruments with certain specifically identified contracts also designated as trading activity. From the time of contract origination, these contracts are marked-to-market and recorded on a net revenue basis in the accompanying consolidated financial statements.

Certain of our crude oil contracts may be with a single counterparty to provide for similar quantities of crude oil to be bought and sold at different locations. These contracts are entered into for a variety of reasons, including effecting the transportation of the commodity, to minimize credit exposure, and/or to meet the competitive demands of the customer. These buy/sell arrangements are reflected on a net revenue basis in the accompanying consolidated financial statements.

Reporting these crude oil contracts on a gross revenue basis would increase our reported revenues as follows for the periods indicated (in thousands):


	Three Months Ended						Six Months Ended
	June 30,						June 30,
	2019		2018		2019		2018

Revenue gross-up	$	223,043	$	56,335	$	465,166	$	102,026

Prepayments and Other Current Assets

6 Months Ended

Jun. 30, 2019

Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]

Prepayments and Other Current Assets

The components of prepayments and other current assets were as follows at the dates indicated (in thousands):


	June 30,		December 31,
	2019		2018

Insurance premiums	$	705	$	677
Rents, licenses and other	1,123		880
Total	$	1,828	$	1,557

Property and Equipment

6 Months Ended

Jun. 30, 2019

Property, Plant and Equipment [Abstract]

Property and Equipment

The historical costs of our property and equipment and related accumulated depreciation balances were as follows at the dates indicated (in thousands):


	Estimated
	Useful Life	June 30,		December 31,
	in Years	2019		2018

Tractors and trailers ⁽¹⁾	5 – 6	$	106,046	$	96,523
Field equipment ⁽²⁾	2 – 20	24,895		20,725
Buildings	5 – 39	16,003		15,746
Office equipment	2 – 5	1,923		1,863
Land		1,790		1,790
Construction in progress		2,538		2,794
Total		153,195		139,441
Less accumulated depreciation		(97,640)		(94,818)
Property and equipment, net		$	55,555	$	44,623

_______________

(1) Amounts include assets held under finance leases for certain tractors in our marketing segment. Gross property and equipment associated with these assets held under finance leases were $5.5 million and $4.7 million at June 30, 2019 and December 31, 2018, respectively. Accumulated amortization associated with assets held under these finance leases were $1.2 million and $0.7 million at June 30, 2019 and December 31, 2018, respectively (see Note 13 for further information).

(2) At June 30, 2019, amount includes assets held under finance leases for certain tank storage and throughput arrangements in our marketing segment. Gross property and equipment associated with these assets held under finance leases were $3.3 million. Accumulated amortization associated with these assets held under finance leases was $0.2 million (see Note 13 for further information).

Components of depreciation and amortization expense were as follows for the periods indicated (in thousands):


	Three Months Ended						Six Months Ended
	June 30,						June 30,
	2019		2018		2019		2018
Depreciation and amortization, excluding amounts
under finance leases	$	3,828	$	2,171	$	7,172	$	4,493
Amortization of property and equipment under
finance leases	456		91		701		181
Total depreciation and amortization	$	4,284	$	2,262	$	7,873	$	4,674

Assets Acquisition

6 Months Ended

Jun. 30, 2019

Asset Acquisition [Abstract]

Asset Acquisition

Asset AcquisitionOn April 10, 2019, we entered into a purchase and sale agreement with EH Transport, Inc. and affiliates (collectively, “EH Transport”), a Houston, Texas based bulk carrier trucking company, for the purchase of certain transportation assets. On May 6, 2019, we closed on the asset acquisition for approximately $6.4 million, which consisted of $5.6 million in cash after post-closing adjustments related to equipment qualifications, 11,145 of our common shares valued at $0.4 million and contingent consideration valued at approximately $0.4 million.

This acquisition added approximately 39 tractors and 53 trailers to our existing transportation fleet, and these assets will be included in our transportation segment. This acquisition adds new customers and new product lines to our transportation segment portfolio, which allows us to grow into new markets. In addition to general chemical products, we expect to haul liquefied petroleum gas, asphalt, bleach and crude oil for customers.

We incurred approximately $0.1 million of acquisition costs in connection with this acquisition, which has been included in the allocation of the purchase price to the assets acquired.

The following table summarizes the consideration paid for the EH Transport assets and the estimated fair value of the assets acquired at the acquisition date (in thousands):


Consideration:
Cash	$	5,611
Value of AE common shares issued	392
Contingent consideration arrangement	431
Fair value of total consideration transferred	$	6,434

Recognized amounts of identifiable assets acquired:
Property and equipment — tractors and trailers	$	4,408
Shop, office and telecommunication equipment	19
Intangible assets — customer relationships	2,007
Total purchase price	$	6,434

The fair market value of the common shares issued in this transaction was determined based upon the closing share price of AE common stock on May 6, 2019 of $35.15.

We assumed no liabilities in this acquisition. The estimated fair value of the acquired property and equipment was determined using the estimated market value of each type of asset. The estimated fair value of the acquired customer relationship intangible assets was determined using an income approach, specifically a discounted cash flow analysis. The income approach estimates the future benefits of the customer relationships and deducts the expenses incurred in servicing the relationships and the contributions from the other business assets to derive the future net benefits of these assets. The future net benefits are discounted back to present value using the appropriate discount rate, which results in the value of the customer relationships.

A customer relationship intangible asset is the relationship between EH Transport and various customers in which we did not have a previous relationship. The customer relationships we acquired in this transaction provide us with access to those customers in which we did not have a previous relationship and allows us to enter product markets in which we had not previously participated. Because of the highly competitive and fragmented transportation market, we believe access to these customers and product lines will provide us with an entry into new markets.

The discounted cash flow analysis used to estimate the fair value of the EH Transport customer relationships relied on Level 3 fair value inputs. Level 3 fair values are based on unobservable inputs. Unobservable inputs are used to measure fair value to the extent that observable inputs are not available, thereby allowing for situations in which there is little, if any, market activity for the asset at the measurement date. With respect to the EH Transport customer relationships, the Level 3 inputs include the rate of retention of the current customers of EH Transport as of the valuation date, our transportation segment historical customer retention rate and projected future revenues associated with the customers. The EH Transport customers expected to remain with us after the transaction were included in the valuation of the customer relationships. We expect to amortize the customer relationship intangible assets over a period of seven years, using a modified straight-line approach.

During the six months ended June 30, 2019, we recorded $0.1 million of amortization expense related to these intangible assets. The purchase and sale agreement includes a contingent consideration arrangement that requires us to pay the former owner of the assets up to a quarterly maximum amount of $146,875 (undiscounted) plus interest for the first four quarters following the closing date of the acquisition. The amount to be paid is based upon the number of qualified truck drivers that are employed by us at the end of each quarter. The potential undiscounted amount of all future payments that could be required to be paid under the contingent consideration arrangement is between $0 and $587,500. The fair value of the contingent consideration arrangement of $0.4 million was estimated by applying an income valuation approach, which is based on Level 3 inputs, including the number of qualified truck drivers we expect to be employed at each payment date.

Cash Deposits and Other Assets

6 Months Ended

Jun. 30, 2019

Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]

Cash Deposits and Other Assets

Components of cash deposits and other assets were as follows at the dates indicated (in thousands):


	June 30,		December 31,
	2019		2018

Amounts associated with liability insurance program:
Insurance collateral deposits	$	1,071	$	1,453
Excess loss fund	821		1,916
Accumulated interest income	527		788
Other amounts:
State collateral deposits	61		57
Materials and supplies	393		443

Total	$	2,873	$	4,657

We have established certain deposits to support participation in our liability insurance program and remittance of state crude oil severance taxes and other state collateral deposits. Insurance collateral deposits are held by the insurance company to cover past or potential open claims based upon a percentage of the maximum assessment under our insurance policies. Insurance collateral deposits are invested at the discretion of our insurance carrier. Excess amounts in our loss fund represent premium payments in excess of claims incurred to date that we may be entitled to recover through settlement or commutation as claim periods are closed. Interest income is earned on the majority of amounts held by the insurance companies and will be paid to us upon settlement of policy years.

Segment Reporting

6 Months Ended

Jun. 30, 2019

Segment Reporting [Abstract]

Segment Reporting

We operate and report in two business segments: (i) crude oil marketing, transportation and storage, and (ii) tank truck transportation of liquid chemicals and dry bulk.

Information concerning our various business activities was as follows for the periods indicated (in thousands):


	Reporting Segments
	Marketing		Transportation		Other		Total

Three Months Ended June 30, 2019
Revenues	$	467,040	$	17,393	$	—	$	484,433
Segment operating earnings ⁽¹⁾	962		977		—		1,939
Depreciation and amortization	2,304		1,980		—		4,284
Property and equipment additions ⁽²⁾	1,348		3,422		—		4,770

Three Months Ended June 30, 2018
Revenues	$	438,791	$	13,626	$	—	$	452,417
Segment operating earnings ⁽¹⁾	5,772		810		—		6,582
Depreciation and amortization	1,336		926		—		2,262
Property and equipment additions	277		1,572		—		1,849

Six Months Ended June 30, 2019
Revenues	$	896,801	$	32,800	$	—	$	929,601
Segment operating (losses) earnings ⁽¹⁾	8,060		1,816		—		9,876
Depreciation, depletion and amortization	4,426		3,447		—		7,873
Property and equipment additions ⁽²⁾	3,002		10,119		—		13,121

Six Months Ended June 30, 2018
Revenues	$	812,429	$	27,244	$	—	$	839,673
Segment operating (losses) earnings ⁽¹⁾	8,730		1,212		—		9,942
Depreciation, depletion and amortization	2,833		1,841		—		4,674
Property and equipment additions	1,070		1,645		—		2,715

_______________

(1) Our crude oil marketing segment’s operating earnings included inventory valuation losses of $1.0 million and inventory liquidation gains of $1.9 million for the three months ended June 30, 2019 and 2018, respectively. For the six months ended June 30, 2019 and 2018, our marketing segment’s operating earnings included inventory liquidation gains of $3.5 million and $2.5 million, respectively.

(2) Our crude oil marketing segment’s property and equipment additions do not include approximately $3.6 million and $4.1 million of tractors and tank storage and throughput arrangements acquired under finance leases during the three and six months ended June 30, 2019, respectively.

Segment operating earnings reflect revenues net of operating costs and depreciation and amortization expense and are reconciled to earnings before income taxes, as follows for the periods indicated (in thousands):


	Three Months Ended June 30,						Six Months Ended June 30,

	2019		2018		2019		2018

Segment operating earnings	$	1,939	$	6,582	$	9,876	$	9,942
General and administrative	(2,582)		(2,284)		(5,266)		(4,567)
Operating earnings	(643)		4,298		4,610		5,375
Gain on dissolution of investment	75		—		573		—



Interest income	731		498		1,387		885
Interest expense	(117)		(15)		(182)		(34)
Earnings before income taxes	$	46	$	4,781	$	6,388	$	6,226

Identifiable assets by business segment were as follows at the dates indicated (in thousands):


	June 30,		December 31,
	2019		2018

Reporting segment:
Marketing	$	113,554	$	119,370
Transportation	47,688		34,112

Cash and other	140,522		125,388
Total assets	$	301,764	$	278,870

There were no intersegment sales during the three and six months ended June 30, 2019 and 2018, respectively. Other identifiable assets are primarily corporate cash, corporate accounts receivable and properties not identified with any specific segment of our business. Accounting policies for transactions between reportable segments are consistent with applicable accounting policies as disclosed herein.

Transactions with Affiliates

6 Months Ended

Jun. 30, 2019

Transactions with Affiliates

We enter into certain transactions in the normal course of business with affiliated entities including direct cost reimbursement for shared phone and administrative services. In addition, we lease our corporate office space from an affiliated entity.

Activities with affiliates were as follows for the periods indicated (in thousands):


	Three Months Ended						Six Months Ended
	June 30,						June 30,
	2019		2018		2019		2018


Affiliate billings to us	$	26	$	25	$	43	$	40
Billings to affiliates	1		1		2		3
Rentals paid to affiliate	122		122		244		244

Derivative Instruments and Fair Value Measurements

6 Months Ended

Jun. 30, 2019

Derivative Instruments and Hedging Activities Disclosure [Abstract]

Derivative Instruments and Fair Value Measurements

Derivative Instruments

In the normal course of our operations, our crude oil marketing segment purchases and sells crude oil. We seek to profit by procuring the commodity as it is produced and then delivering the material to the end users or the intermediate use marketplace. As typical for the industry, these transactions are made pursuant to the terms of forward month commodity purchase and/or sale contracts. Some of these contracts meet the definition of a derivative instrument, and therefore, we account for these contracts at fair value, unless the normal purchase and sale exception is applicable. These types of underlying contracts are standard for the industry and are the governing document for our crude oil marketing segment. None of our derivative instruments have been designated as hedging instruments.

At June 30, 2019, we had in place eight commodity purchase and sale contracts, of which six of these contracts had no fair value associated with them as the contractual prices of crude oil were within the range of prices specified in the agreements. These commodity purchase and sale contracts encompassed approximately:

•322 barrels per day of crude oil during July 2019 through August 2019;

•516 barrels per day of crude oil during September 2019 through December 2019; and

•258 barrels per day of crude oil during January 2020 through February 2020.

The estimated fair value of forward month commodity contracts (derivatives) reflected in the accompanying unaudited condensed consolidated balance sheet were as follows at the date indicated (in thousands):


	June 30, 2019
	Balance Sheet Location and Amount
	Current		Other		Current		Other
	Assets		Assets		Liabilities		Liabilities
Asset derivatives:
Fair value forward hydrocarbon commodity
contracts at gross valuation	$	240	$	—	$	—	$	—
Liability derivatives:
Fair value forward hydrocarbon commodity
contracts at gross valuation	—		—		236		—
Less counterparty offsets	—		—		—		—
As reported fair value contracts	$	240	$	—	$	236	$	—

At December 31, 2018, we had in place 10 commodity purchase and sale contracts with fair value associated with them as the contractual prices of crude oil were outside of the range of prices specified in the agreements. These commodity purchase and sale contracts encompassed approximately:

•322 barrels per day of crude oil during January 2019 through April 2019;

•258 barrels per day of crude oil during May 2019;

•322 barrels per day of crude oil during June 2019 through August 2019; and

•258 barrels per day of crude oil during September 2019 through December 2019.


	December 31, 2018
	Balance Sheet Location and Amount
	Current		Other		Current		Other
	Assets		Assets		Liabilities		Liabilities
Asset derivatives:
Fair value forward hydrocarbon commodity
contracts at gross valuation	$	162	$	—	$	—	$	—
Liability derivatives:
Fair value forward hydrocarbon commodity
contracts at gross valuation	—		—		139		—
Less counterparty offsets	—		—		—		—
As reported fair value contracts	$	162	$	—	$	139	$	—

We only enter into commodity contracts with creditworthy counterparties and evaluate our exposure to significant counterparties on an ongoing basis. At June 30, 2019 and December 31, 2018, we were not holding nor have we posted any collateral to support our forward month fair value derivative activity. We are not subject to any credit-risk related trigger events. We have no other financial investment arrangements that would serve to offset our derivative contracts.

Forward month commodity contracts (derivatives) reflected in the accompanying unaudited condensed consolidated statements of operations were as follows for the periods indicated (in thousands):


	Gains (losses)
	Three Months Ended						Six Months Ended
	June 30,						June 30,
	2019		2018		2019		2018

Revenues – marketing	$	—	$	1	$	(20)	$	2

Fair Value Measurements

The following tables set forth, by level with the Level 1, 2 and 3 fair value hierarchy, the carrying values of our financial assets and liabilities at the dates indicated (in thousands):


	June 30, 2019
	Fair Value Measurements Using
	Quoted Prices
	in Active		Significant
	Markets for		Other		Significant
	Identical Assets		Observable		Unobservable
	and Liabilities		Inputs		Inputs		Counterparty
	(Level 1)		(Level 2)		(Level 3)		Offsets		Total

Derivatives:
Current assets	$	—	$	240	$	—	$	—	$	240
Current liabilities	—		(236)		—		—		(236)
Net value	$	—	$	4	$	—	$	—	$	4


	December 31, 2018
	Fair Value Measurements Using
	Quoted Prices
	in Active		Significant
	Markets for		Other		Significant
	Identical Assets		Observable		Unobservable
	and Liabilities		Inputs		Inputs		Counterparty
	(Level 1)		(Level 2)		(Level 3)		Offsets		Total
Derivatives:
Current assets	$	—	$	162	$	—	$	—	$	162
Current liabilities	—		(139)		—		—		(139)
Net value	$	—	$	23	$	—	$	—	$	23

These assets and liabilities are measured on a recurring basis and are classified based on the lowest level of input used to estimate their fair value. Our assessment of the relative significance of these inputs requires judgments.

When determining fair value measurements, we make credit valuation adjustments to reflect both our own nonperformance risk and our counterparty’s nonperformance risk. When adjusting the fair value of derivative contracts for the effect of nonperformance risk, we consider the impact of netting and any applicable credit enhancements. Credit valuation adjustments utilize Level 3 inputs, such as credit scores to evaluate the likelihood of default by us or our counterparties. At June 30, 2019 and December 31, 2018, credit valuation adjustments were not significant to the overall valuation of our fair value contracts. As a result, applicable fair value assets and liabilities are included in their entirety in the fair value hierarchy.

Share-Based Compensation Plan

6 Months Ended

Jun. 30, 2019

Share-based Payment Arrangement [Abstract]

Share-Based Compensation Plan

We have in place a long-term incentive plan under which any employee or non-employee director who provides services to us is eligible to participate in the plan. The 2018 LTIP, which is overseen by the Compensation Committee of our Board of Directors, provides for the grant of various types of equity awards, of which restricted stock unit awards and performance-based compensation awards have been granted. The maximum number of shares authorized for issuance under the 2018 LTIP is 150,000 shares, and the 2018 LTIP is effective until May 8, 2028. After giving effect to awards granted under the 2018 LTIP and assuming the potential achievement of the maximum amounts of the performance factors through June 30, 2019, a total of 98,213 shares were available for issuance.

Compensation expense recognized in connection with equity-based awards was as follows for the periods presented (in thousands):


	Three Months Ended						Six Months Ended
	June 30,						June 30,
	2019		2018		2019		2018

Compensation expense	$	74	$	3	$	197	$	3

At June 30, 2019 and December 31, 2018, we had $15,602 and $9,533, respectively, of accrued dividend amounts for awards granted under the 2018 LTIP.

Restricted Stock Unit Awards

The following table presents restricted stock unit award activity for the periods indicated:


		Weighted-
		Average Grant
	Number of	Date Fair Value
	Shares	per Share ⁽¹⁾

Restricted stock unit awards at January 1, 2019	13,733	$	43.00
Granted ⁽²⁾	14,376	$	34.00
Vested	(5,729)	$	43.00
Forfeited	(325)	$	43.00
Restricted stock unit awards at June 30, 2019	22,055

_______________

(1) Determined by dividing the aggregate grant date fair value of awards by the number of awards issued.

(2) The aggregate grant date fair value of restricted stock unit awards issued during 2019 was $0.5 million based on a grant date market price of our common shares of $34.00 per share.

Unrecognized compensation cost associated with restricted stock unit awards was approximately $0.7 million at June 30, 2019. Due to the graded vesting provisions of these awards, we expect to recognize the remaining compensation cost for these awards over a weighted-average period of 1.8 years.

Performance Share Unit Awards

The following table presents performance share unit award activity for the periods indicated:


		Weighted-
		Average Grant
	Number of	Date Fair Value
	Shares	per Share ⁽¹⁾

Performance share unit awards at January 1, 2019	3,966	$	43.00
Granted ⁽²⁾	8,094	$	34.00
Performance factor decrease ⁽³⁾	(185)	$	43.00
Vested	—	$	—
Forfeited	(117)	$	43.00
Performance share unit awards at June 30, 2019	11,758

_______________

(1) Determined by dividing the aggregate grant date fair value of awards by the number of awards issued.

(2) The aggregate grant date fair value of performance share unit awards issued during 2019 was $0.3 million based on a grant date market price of our common shares of $34.00 per share and assuming a performance factor of 100 percent.

(3) The performance factor for awards granted during 2018 was lowered to 47.5 percent based upon a comparison of actual results for 2018 to performance goals.

Unrecognized compensation cost associated with performance share unit awards was approximately $0.4 million at June 30, 2019. We expect to recognize the remaining compensation cost for these awards over a weighted-average period of 2.6 years.

Supplemental Cash Flow Information

6 Months Ended

Jun. 30, 2019

Supplemental Cash Flow Elements [Abstract]

Supplemental Cash Flow Information

Supplemental cash flows and non-cash transactions were as follows for the periods indicated (in thousands):


	Six Months Ended
	June 30,
	2019		2018

Cash paid for interest	$	182	$	34
Cash paid for federal and state income taxes	233		210

Non-cash transactions:
Change in accounts payable related to property and equipment additions	(1,179)		(44)
Property and equipment acquired under finance leases	4,148		—
Issuance of common shares in asset acquisition (see Note 6)	392		—

See Note 13 for information related to non-cash transactions related to the adoption of the new lease accounting standard.

Leases

6 Months Ended

Jun. 30, 2019

Leases [Abstract]

Leases

Adoption of ASC 842

In February 2016, the Financial Accounting Standards Board issued Accounting Standards Codification 842, Leases (“ASC 842”), which requires lessees to recognize a right-of-use (“ROU”) asset and a corresponding lease liability for leases with terms longer than twelve months. We adopted the new standard effective January 1, 2019, using a modified retrospective transition method and applied certain optional transitional practical expedients.

We elected an optional transition method that allowed application of the new standard at the adoption date and the recognition of a cumulative-effect adjustment to the opening balance of retained earnings in the period of adoption with no adjustment to previously reported results. In accordance with this approach, our consolidated financial statements for periods prior to January 1, 2019 were not revised to reflect the new lease accounting guidance. We also elected the package of practical expedients permitted under the transition guidance within the new standard, which among other things, allowed the carry forward of historical lease classification. We did not elect the practical expedient related to hindsight.

ASC 842 changes the way our operating leases are recorded, presented and disclosed in our consolidated financial statements. Upon adoption of ASC 842 on January 1, 2019, we recognized a ROU asset and a corresponding lease liability based on the present value of then existing operating lease obligations of approximately $11.4 million on our consolidated balance sheet. In addition, there are several key accounting policy elections that we made upon adoption of ASC 842 including:

•We did not recognize ROU assets and lease liabilities for short-term leases and instead record them in a manner similar to operating leases under ASC 840, Leases, lease accounting guidelines. A short term lease is one with a maximum lease term of 12 months or less and does not include a purchase option or renewal option the lessee is reasonably certain to exercise.

•We have also elected the non-lease component practical expedient for any asset class where lease and non-lease components are comingled and the non-lease component is determined to be insignificant when compared to the lease component.

Lease Recognition

We determine if an arrangement is a lease at inception. Operating leases are included in operating lease ROU assets, other current liabilities and operating lease liabilities in the condensed consolidated balance sheets. Finance leases are included in property and equipment, other current liabilities and other long-term liabilities in the condensed consolidated balance sheets.

ROU assets represent our right to use an underlying asset for the lease term and lease liabilities represent our obligation to make lease payments arising from the lease. ROU assets and liabilities are recognized at the lease commencement date based on the present value of lease payments over the lease term. As most of our leases do not provide an implicit rate, we use our incremental borrowing rate based on the information available at commencement date in determining the present value of lease payments. We use the implicit rate when readily determinable. At adoption, the ROU asset also includes any lease payment made and excludes lease incentives and initial direct costs. Our lease terms may include options to extend or terminate the lease when it is reasonably certain that we will exercise that option. Lease expense for lease payments is recognized on a straight-line basis over the lease term.

Our lease agreements do not contain any leases with variable lease payments (i.e., payments that depend on a percentage of sales of a lessee or payments that increase based upon an index such as CPI), residual value guarantees probable of being paid or material restrictive covenants. Lease agreements with lease and non-lease components are generally accounted for separately when practical. For leases where the lease and non-lease component are comingled and the non-lease component is determined to be insignificant when compared to the lease component, the lease and the non-lease components are treated as a single lease component for all asset classes.

We are a lessee in noncancellable (1) operating leases for office space, equipment and lease and terminal access contracts for tank storage and dock access for our crude oil marketing business, and (2) finance leases for tractors and tank storage and throughput for our crude oil marketing business. Leases with an initial term of twelve months or less are not included on the balance sheet.

Some leases include one or more options to renew, with renewal terms that can extend the lease term for generally one year with exercise of lease renewal options being at our sole discretion as lessee.

The following table provides the components of lease expense for the period indicated (in thousands):


	Three Months		Six Months
	Ended		Ended
	June 30,		June 30,
	2019		2019
Finance lease cost:
Amortization of ROU assets	$	456	$	701
Interest on lease liabilities	81		127
Operating lease cost	717		1,579
Short-term lease cost	2,863		4,828


Total lease expense	$	4,117	$	7,235

The following table provides supplemental cash flow and other information related to leases for the period indicated (in thousands):


	Six Months
	Ended
	June 30,
	2019
Cash paid for amounts included in measurement of lease liabilities:
Operating cash flows from operating leases ⁽¹⁾	$	1,274
Operating cash flows from finance leases	94
Financing cash flows from finance leases	651

ROU assets obtained in exchange for new lease liabilities:
Finance leases	4,148
Operating leases	11,111

______________

(1) Amount is included in Other operating activities on the unaudited condensed consolidated cash flow statement.

The following table provides the lease term and discount rate for the period indicated:


						Six Months
						Ended
						June 30,
						2019
Weighted-average remaining lease term (years):
Finance leases						3.52
Operating leases						5.24

Weighted-average discount rate:
Finance leases						4.9%
Operating leases						5.0%

The following table provides supplemental balance sheet information related to leases at the date indicated (in thousands):


	June 30,
	2019
Assets
Finance lease assets ⁽¹⁾	$	7,490
Operating lease ROU assets	10,093

Liabilities
Current
Finance lease liabilities	2,116
Operating lease liabilities	2,097
Noncurrent
Finance lease liabilities	5,473
Operating lease liabilities	7,999

______________

(1) Amount is included in Property and equipment, net on the unaudited condensed consolidated balance sheet.

The following table provides maturities of undiscounted lease liabilities at June 30, 2019 (in thousands):


	Finance		Operating
	Lease		Lease

Remainder of 2019	$	1,213	$	1,280
2020	2,426		2,498
2021	2,426		2,102
2022	1,492		1,770
2023	642		1,668
Thereafter	37		2,112
Total lease payments	8,236		11,430
Less: Interest	(647)		(1,334)
Present value of lease liabilities	7,589		10,096
Less: Current portion of lease obligation	(2,116)		(2,097)
Total long-term lease obligation	$	5,473	$	7,999

The following table provides maturities of undiscounted lease liabilities at December 31, 2018 (in thousands):


	Finance		Operating
	Lease		Lease

2019	$	1,052	$	4,242
2020	1,052		2,258
2021	1,052		2,107
2022	909		1,782
2023	451		1,495
Thereafter	—		1,488
Total lease payments	4,516		$	13,372
Less: Interest	(424)
Present value of lease liabilities	4,092
Less: Current portion of lease obligation	(883)
Total long-term lease obligation	$	3,209

Leases

Adoption of ASC 842

Lease Recognition

The following table provides the components of lease expense for the period indicated (in thousands):


	Three Months		Six Months
	Ended		Ended
	June 30,		June 30,
	2019		2019
Finance lease cost:
Amortization of ROU assets	$	456	$	701
Interest on lease liabilities	81		127
Operating lease cost	717		1,579
Short-term lease cost	2,863		4,828


Total lease expense	$	4,117	$	7,235

The following table provides supplemental cash flow and other information related to leases for the period indicated (in thousands):


	Six Months
	Ended
	June 30,
	2019
Cash paid for amounts included in measurement of lease liabilities:
Operating cash flows from operating leases ⁽¹⁾	$	1,274
Operating cash flows from finance leases	94
Financing cash flows from finance leases	651

ROU assets obtained in exchange for new lease liabilities:
Finance leases	4,148
Operating leases	11,111

______________

(1) Amount is included in Other operating activities on the unaudited condensed consolidated cash flow statement.

The following table provides the lease term and discount rate for the period indicated:


						Six Months
						Ended
						June 30,
						2019
Weighted-average remaining lease term (years):
Finance leases						3.52
Operating leases						5.24

Weighted-average discount rate:
Finance leases						4.9%
Operating leases						5.0%

The following table provides supplemental balance sheet information related to leases at the date indicated (in thousands):


	June 30,
	2019
Assets
Finance lease assets ⁽¹⁾	$	7,490
Operating lease ROU assets	10,093

Liabilities
Current
Finance lease liabilities	2,116
Operating lease liabilities	2,097
Noncurrent
Finance lease liabilities	5,473
Operating lease liabilities	7,999

______________

(1) Amount is included in Property and equipment, net on the unaudited condensed consolidated balance sheet.

The following table provides maturities of undiscounted lease liabilities at June 30, 2019 (in thousands):


	Finance		Operating
	Lease		Lease

Remainder of 2019	$	1,213	$	1,280
2020	2,426		2,498
2021	2,426		2,102
2022	1,492		1,770
2023	642		1,668
Thereafter	37		2,112
Total lease payments	8,236		11,430
Less: Interest	(647)		(1,334)
Present value of lease liabilities	7,589		10,096
Less: Current portion of lease obligation	(2,116)		(2,097)
Total long-term lease obligation	$	5,473	$	7,999

The following table provides maturities of undiscounted lease liabilities at December 31, 2018 (in thousands):


	Finance		Operating
	Lease		Lease

2019	$	1,052	$	4,242
2020	1,052		2,258
2021	1,052		2,107
2022	909		1,782
2023	451		1,495
Thereafter	—		1,488
Total lease payments	4,516		$	13,372
Less: Interest	(424)
Present value of lease liabilities	4,092
Less: Current portion of lease obligation	(883)
Total long-term lease obligation	$	3,209

Commitments and Contingencies

6 Months Ended

Jun. 30, 2019

Commitments and Contingencies Disclosure [Abstract]

Commitments and Contingencies

Insurance Policies

We establish a liability under our automobile and workers’ compensation insurance policies for expected claims incurred but not reported on a monthly basis. As claims are paid, the liability is relieved. Our accruals for automobile and workers’ compensation claims are presented in the table below.

For periods prior to October 1, 2017, we pre-funded our estimated claims, and therefore, we could either receive a return of premium paid or be assessed for additional premiums up to pre-established limits. Additionally, in certain instances, the risk of insured losses was shared with a group of similarly situated entities through an insurance captive. We have appropriately recognized estimated expenses and liabilities related to these policies for losses incurred but not reported to us or our insurance carrier. The amount of pre-funded insurance premiums left to cover potential future losses are presented in the table below. If the potential insurance claims do not further develop, the pre-funded premiums will be returned to us as a premium refund.

The amount of pre-funded insurance premiums left to cover potential future losses related to periods prior to October 1, 2017, and our accruals for automobile and workers’ compensation claims were as follows at the dates indicated (in thousands):


	June 30,		December 31,
	2019		2018

Pre-funded premiums for losses incurred but not reported	$	236	$	427
Accrued automobile and workers’ compensation claims	3,007		2,246

We maintain a self-insurance program for managing employee medical claims. A liability for expected claims incurred but not reported is established on a monthly basis. As claims are paid, the liability is relieved. We also maintain third party insurance stop-loss coverage for individual medical claims exceeding a certain minimum threshold. In addition, we maintain $1.0 million of umbrella insurance coverage for annual aggregate medical claims exceeding approximately $9.6 million. Medical accrual amounts were as follows at the dates indicated (in thousands):


	June 30,		December 31,
	2019		2018

Accrued medical claims	$	1,387	$	1,181

Litigation

From time to time as incidental to our operations, we may become involved in various lawsuits and/or disputes. Primarily as an operator of an extensive trucking fleet, we are a party to motor vehicle accidents, worker compensation claims and other items of general liability as would be typical for the industry. We are presently unaware of any claims against us that are either outside the scope of insurance coverage or that may exceed the level of insurance coverage and could potentially represent a material adverse effect on our financial position or results of operations.

Summary of Significant Accounting Policies (Policies)	6 Months Ended
Summary of Significant Accounting Policies (Policies)	Jun. 30, 2019
Accounting Policies [Abstract]
Organization	Organization Adams Resources & Energy, Inc. (“AE”) is a publicly traded Delaware corporation organized in 1973, the common shares of which are listed on the NYSE American LLC under the ticker symbol “AE”. We, through our subsidiaries, are primarily engaged in the business of crude oil marketing, transportation and storage in various crude oil and natural gas basins in the lower 48 states of the United States (“U.S.”). We also conduct tank truck transportation of liquid chemicals and dry bulk primarily in the lower 48 states of the U.S. with deliveries into Canada and Mexico, and with terminals in the Gulf Coast region of the U.S. Unless the context requires otherwise, references to “we,” “us,” “our,” the “Company” or “AE” are intended to mean the business and operations of Adams Resources & Energy, Inc. and its consolidated subsidiaries. We operate and report in two business segments: (i) crude oil marketing, transportation and storage, and (ii) tank truck transportation of liquid chemicals and dry bulk.
Basis of Presentation	Basis of Presentation Our results of operations for the three and six months ended June 30, 2019 are not necessarily indicative of results expected for the full year of 2019. In the opinion of management, the accompanying unaudited condensed consolidated financial statements reflect all adjustments consisting of normal recurring accruals necessary for fair presentation. The condensed consolidated financial statements and the accompanying notes are prepared in accordance with U.S. generally accepted accounting principles (“GAAP”) for interim financial statements and the rules of the U.S. Securities and Exchange Commission (“SEC”). Certain information and footnote disclosures required by GAAP for complete annual financial statements have been omitted and, therefore, these interim financial statements should be read in conjunction with our audited consolidated financial statements included in our Annual Report on Form 10-K for the year ended December 31, 2018 (the “2018 Form 10-K”) filed with the SEC on March 8, 2019. All significant intercompany transactions and balances have been eliminated in consolidation.
Use of Estimates	Use of EstimatesThe preparation of our financial statements in conformity with GAAP requires management to use estimates and assumptions that affect the reported amount of assets and liabilities and disclosure of contingent assets and liabilities at the date of the financial statements and the reported amounts of revenues and expenses during the reporting period. We base our estimates and judgments on historical experience and on various other assumptions and information we believe to be reasonable under the circumstances. Estimates and assumptions about future events and their effects cannot be perceived with certainty and, accordingly, these estimates may change as new events occur, as more experience is acquired, as additional information is obtained and as the operating environment changes. While we believe the estimates and assumptions used in the preparation of these condensed consolidated financial statements are appropriate, actual results could differ from those estimates.
Cash, Cash Equivalents and Restricted Cash	Cash, Cash Equivalents and Restricted Cash Restricted cash represents an amount held in a segregated bank account by Wells Fargo as collateral for amounts outstanding under our letter of credit facility. In June 2019, the amount of outstanding letters of credit under our letter of credit facility exceeded the borrowing base as defined in the letter of credit facility agreement. As a result, we were required to deposit cash with the lender as security for the outstanding letters of credit. See “Letter of Credit Facility” within this Note 2 for further information. Our borrowing base is based on our net receivable balance, and due to customer prepayments, our borrowing base as outlined in the letter of credit facility did not fully support the outstanding letters of credit that have been issued. As a result, on July 1, 2019, we canceled the letter of credit facility, and secured the outstanding letters of credit with our restricted cash balance.
Earnings Per Share	Earnings Per ShareBasic earnings (losses) per share is computed by dividing our net earnings (losses) by the weighted average number of shares of common stock outstanding during the period. Diluted earnings (losses) per share is computed by giving effect to all potential shares of common stock outstanding, including our stock related to unvested restricted stock unit awards. Unvested restricted stock unit awards granted under the Adams Resources & Energy, Inc. 2018 Long-Term Incentive Plan (“2018 LTIP”) are not considered to be participating securities as the holders of these shares do not have non-forfeitable dividend rights in the event of our declaration of a dividend for common shares (see Note 10 for further discussion).
Fair Value Measurements	Fair Value Measurements The carrying amounts reported in the unaudited condensed consolidated balance sheets for cash and cash equivalents, accounts receivable and accounts payable approximates fair value because of the immediate or short-term maturity of these financial instruments. Marketable securities are recorded at fair value based on market quotations from actively traded liquid markets. A three-tier hierarchy has been established that classifies fair value amounts recognized in the financial statements based on the observability of inputs used to estimate these fair values. The hierarchy considers fair value amounts based on observable inputs (Levels 1 and 2) to be more reliable and predictable than those based primarily on unobservable inputs (Level 3). At each balance sheet reporting date, we categorize our financial assets and liabilities using this hierarchy. Fair value contracts consist of derivative financial instruments and are recorded as either an asset or liability measured at its fair value. Changes in fair value are recognized immediately in earnings unless the derivatives qualify for, and we elect, cash flow hedge accounting. We had no contracts designated for hedge accounting during any current reporting periods (see Note 10 for further information).
Income Taxes	Income TaxesIncome taxes are accounted for using the asset and liability method. Under this approach, deferred tax assets and liabilities are recognized based on anticipated future tax consequences attributable to differences between financial statement carrying amounts of these items and their respective tax basis.
Letter of Credit Facility	Letter of Credit Facility We maintained a Credit and Security Agreement with Wells Fargo Bank, National Association to provide for the issuance of up to $60.0 million in stand-by letters of credit primarily used to support crude oil purchases within our crude oil marketing segment and for other purposes. We used the letter of credit facility for letters of credit related to our insurance program. This facility was collateralized by the eligible accounts receivable within our crude oil marketing segment and expires on August 30, 2019. The issued stand-by letters of credit were canceled as the underlying purchase obligations were satisfied by cash payment when due. The letter of credit facility placed certain restrictions on GulfMark Energy, Inc., one of our wholly owned subsidiaries. These restrictions included the maintenance of positive net earnings excluding inventory valuation changes, as defined, among other restrictions.
Property and Equipment	Property and Equipment Property and equipment is recorded at cost. Expenditures for additions, improvements and other enhancements to property and equipment are capitalized, and minor replacements, maintenance and repairs that do not extend asset life or add value are charged to expense as incurred. When property and equipment assets are retired or otherwise disposed of, the related cost and accumulated depreciation is removed from the accounts and any resulting gain or loss is included in results of operations in operating costs and expenses for the respective period. Property and equipment, except for land, is depreciated using the straight-line method over the estimated average useful lives ranging from two to thirty-nine years. We review our long-lived assets for impairment whenever there is evidence that the carrying value of these assets may not be recoverable. Any impairment recognized is permanent and may not be restored. Property and equipment is reviewed at the lowest level of identifiable cash flows. For properties requiring impairment, the fair value is estimated based on an internal discounted cash flow model of future cash flows.
Stock-Based Compensation	Stock-Based CompensationWe measure all share-based payments, including the issuance of restricted stock units and performance share units to employees and board members, using a fair-value based method. The cost of services received from employees and non-employee board members in exchange for awards of equity instruments is recognized in the consolidated statement of operations based on the estimated fair value of those awards on the grant date and amortized on a straight-line basis over the requisite service period. The fair value of restricted stock unit awards and performance share unit awards is based on the closing price of our common stock on the grant date. We account for forfeitures as they occur.
Other Marketing Revenue	Other Marketing Revenue Certain of the commodity purchase and sale contracts utilized by our crude oil marketing business qualify as derivative instruments with certain specifically identified contracts also designated as trading activity. From the time of contract origination, these contracts are marked-to-market and recorded on a net revenue basis in the accompanying consolidated financial statements. Certain of our crude oil contracts may be with a single counterparty to provide for similar quantities of crude oil to be bought and sold at different locations. These contracts are entered into for a variety of reasons, including effecting the transportation of the commodity, to minimize credit exposure, and/or to meet the competitive demands of the customer. These buy/sell arrangements are reflected on a net revenue basis in the accompanying consolidated financial statements

Summary of Significant Accounting Policies (Tables)

6 Months Ended

Jun. 30, 2019

Accounting Policies [Abstract]

Summary of Cash and Cash Equivalents and Restricted Cash


	June 30,
	2019

Cash and cash equivalents	$	127,670
Restricted cash	4,876
Total cash, cash equivalents and restricted cash shown in the
unaudited condensed consolidated statements of cash flow	$	132,546

Schedule of Earnings Per Share, Basic and Diluted

A reconciliation of the calculation of basic and diluted earnings per share is as follows (in thousands, except per share data):


	Three Months Ended June 30,						Six Months Ended June 30,

	2019		2018		2019		2018
Earnings per share — numerator:
Net earnings	$	6	$	3,620	$	4,914	$	4,758

Denominator:
Basic weighted average number of shares outstanding	4,227		4,218		4,223		4,218

Basic earnings per share	$	—	$	0.86	$	1.16	$	1.13

Diluted earnings per share:
Diluted weighted average number of shares outstanding:
Common shares	4,227		4,218		4,223		4,218
Restricted stock unit awards	—		—		6		—
Performance share unit awards⁽¹⁾	—		—		—		—
Total	4,227		4,218		4,229		4,218

Diluted earnings per share	$	—	$	0.86	$	1.16	$	1.13

_______________

Schedule of Common Stock Outstanding

The following table reconciles our outstanding common stock for the periods indicated:


						Common
						shares

Balance, January 1, 2019						4,217,596
Vesting of restricted stock unit awards						375
Balance, March 31, 2019						4,217,971
Issuance of shares in acquisition (see Note 6)						11,145
Vesting of restricted stock unit awards (see Note 11)						5,354
Shares withheld to cover taxes upon vesting of restricted stock unit awards						(883)
Balance, June 30, 2019						4,233,587

Revenue Recognition (Tables)

6 Months Ended

Jun. 30, 2019

Revenue from Contract with Customer [Abstract]

Disaggregation of Revenue

The following table disaggregates our revenue by segment and by major source for the periods indicated (in thousands):


	Reporting Segments
	Marketing		Transportation		Total

Three Months Ended June 30, 2019
Revenues from contracts with customers	$	390,407	$	17,393	$	407,800
Other ⁽¹⁾	76,633		—		76,633
Total revenues	$	467,040	$	17,393	$	484,433

Timing of revenue recognition:
Goods transferred at a point in time	$	390,407	$	—	$	390,407
Services transferred over time	—		17,393		17,393
Total revenues from contracts with customers	$	390,407	$	17,393	$	407,800

Three Months Ended June 30, 2018
Revenues from contracts with customers	$	419,365	$	13,626	$	432,991
Other ⁽¹⁾	19,426		—		19,426
Total revenues	$	438,791	$	13,626	$	452,417

Timing of revenue recognition:
Goods transferred at a point in time	$	419,365	$	—	$	419,365
Services transferred over time	—		13,626		13,626
Total revenues from contracts with customers	$	419,365	$	13,626	$	432,991

Six Months Ended June 30, 2019
Revenues from contracts with customers	$	751,138	$	32,800	$	783,938
Other ⁽¹⁾	145,663		—		145,663
Total revenues	$	896,801	$	32,800	$	929,601

Timing of revenue recognition:
Goods transferred at a point in time	$	751,138	$	—	$	751,138
Services transferred over time	—		32,800		32,800
Total revenues from contracts with customers	$	751,138	$	32,800	$	783,938

Six Months Ended June 30, 2018
Revenues from contracts with customers	$	779,450	$	27,244	$	806,694
Other ⁽¹⁾	32,979		—		32,979
Total revenues	$	812,429	$	27,244	$	839,673

Timing of revenue recognition:
Goods transferred at a point in time	$	779,450	$	—	$	779,450
Services transferred over time	—		27,244		27,244
Total revenues from contracts with customers	$	779,450	$	27,244	$	806,694

_______________

(1) Other marketing revenues are recognized under ASC 815, Derivatives and Hedging, and ASC 845, Nonmonetary Transactions – Purchases and Sales of Inventory with the Same Counterparty.

Schedule of New Accounting Pronouncements and Changes in Accounting Principles

Reporting these crude oil contracts on a gross revenue basis would increase our reported revenues as follows for the periods indicated (in thousands):


	Three Months Ended						Six Months Ended
	June 30,						June 30,
	2019		2018		2019		2018

Revenue gross-up	$	223,043	$	56,335	$	465,166	$	102,026

Prepayments and Other Current Assets (Tables)

6 Months Ended

Jun. 30, 2019

Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]

Components of Prepayments and Other Current Assets

The components of prepayments and other current assets were as follows at the dates indicated (in thousands):


	June 30,		December 31,
	2019		2018

Insurance premiums	$	705	$	677
Rents, licenses and other	1,123		880
Total	$	1,828	$	1,557

Property and Equipment (Tables)

6 Months Ended

Jun. 30, 2019

Property, Plant and Equipment [Abstract]

Property and equipment

The historical costs of our property and equipment and related accumulated depreciation balances were as follows at the dates indicated (in thousands):


	Estimated
	Useful Life	June 30,		December 31,
	in Years	2019		2018

Tractors and trailers ⁽¹⁾	5 – 6	$	106,046	$	96,523
Field equipment ⁽²⁾	2 – 20	24,895		20,725
Buildings	5 – 39	16,003		15,746
Office equipment	2 – 5	1,923		1,863
Land		1,790		1,790
Construction in progress		2,538		2,794
Total		153,195		139,441
Less accumulated depreciation		(97,640)		(94,818)
Property and equipment, net		$	55,555	$	44,623

_______________

Components of depreciation and amortization expense were as follows for the periods indicated (in thousands):


	Three Months Ended						Six Months Ended
	June 30,						June 30,
	2019		2018		2019		2018
Depreciation and amortization, excluding amounts
under finance leases	$	3,828	$	2,171	$	7,172	$	4,493
Amortization of property and equipment under
finance leases	456		91		701		181
Total depreciation and amortization	$	4,284	$	2,262	$	7,873	$	4,674

Assets Acquisition (Tables)

6 Months Ended

Jun. 30, 2019

Asset Acquisition [Abstract]

Schedule Of Asset Acquisition

The following table summarizes the consideration paid for the EH Transport assets and the estimated fair value of the assets acquired at the acquisition date (in thousands):


Consideration:
Cash	$	5,611
Value of AE common shares issued	392
Contingent consideration arrangement	431
Fair value of total consideration transferred	$	6,434

Recognized amounts of identifiable assets acquired:
Property and equipment — tractors and trailers	$	4,408
Shop, office and telecommunication equipment	19
Intangible assets — customer relationships	2,007
Total purchase price	$	6,434

Cash Deposits and Other Assets (Tables)

6 Months Ended

Jun. 30, 2019

Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]

Components of cash deposits and other assets

Components of cash deposits and other assets were as follows at the dates indicated (in thousands):


	June 30,		December 31,
	2019		2018

Amounts associated with liability insurance program:
Insurance collateral deposits	$	1,071	$	1,453
Excess loss fund	821		1,916
Accumulated interest income	527		788
Other amounts:
State collateral deposits	61		57
Materials and supplies	393		443

Total	$	2,873	$	4,657

Segment Reporting (Tables)

6 Months Ended

Jun. 30, 2019

Segment Reporting [Abstract]

Information concerning business activities

Information concerning our various business activities was as follows for the periods indicated (in thousands):


	Reporting Segments
	Marketing		Transportation		Other		Total

Three Months Ended June 30, 2019
Revenues	$	467,040	$	17,393	$	—	$	484,433
Segment operating earnings ⁽¹⁾	962		977		—		1,939
Depreciation and amortization	2,304		1,980		—		4,284
Property and equipment additions ⁽²⁾	1,348		3,422		—		4,770

Three Months Ended June 30, 2018
Revenues	$	438,791	$	13,626	$	—	$	452,417
Segment operating earnings ⁽¹⁾	5,772		810		—		6,582
Depreciation and amortization	1,336		926		—		2,262
Property and equipment additions	277		1,572		—		1,849

Six Months Ended June 30, 2019
Revenues	$	896,801	$	32,800	$	—	$	929,601
Segment operating (losses) earnings ⁽¹⁾	8,060		1,816		—		9,876
Depreciation, depletion and amortization	4,426		3,447		—		7,873
Property and equipment additions ⁽²⁾	3,002		10,119		—		13,121

Six Months Ended June 30, 2018
Revenues	$	812,429	$	27,244	$	—	$	839,673
Segment operating (losses) earnings ⁽¹⁾	8,730		1,212		—		9,942
Depreciation, depletion and amortization	2,833		1,841		—		4,674
Property and equipment additions	1,070		1,645		—		2,715

_______________

Reconciliation of segment earnings to earnings before income taxes


	Three Months Ended June 30,						Six Months Ended June 30,

	2019		2018		2019		2018

Segment operating earnings	$	1,939	$	6,582	$	9,876	$	9,942
General and administrative	(2,582)		(2,284)		(5,266)		(4,567)
Operating earnings	(643)		4,298		4,610		5,375
Gain on dissolution of investment	75		—		573		—



Interest income	731		498		1,387		885
Interest expense	(117)		(15)		(182)		(34)
Earnings before income taxes	$	46	$	4,781	$	6,388	$	6,226

Identifiable assets by industry segment

Identifiable assets by business segment were as follows at the dates indicated (in thousands):


	June 30,		December 31,
	2019		2018

Reporting segment:
Marketing	$	113,554	$	119,370
Transportation	47,688		34,112

Cash and other	140,522		125,388
Total assets	$	301,764	$	278,870

Transactions with Affiliates (Tables)

6 Months Ended

Jun. 30, 2019

Activities with affiliates

Activities with affiliates were as follows for the periods indicated (in thousands):


	Three Months Ended						Six Months Ended
	June 30,						June 30,
	2019		2018		2019		2018


Affiliate billings to us	$	26	$	25	$	43	$	40
Billings to affiliates	1		1		2		3
Rentals paid to affiliate	122		122		244		244

Derivative Instruments and Fair Value Measurements (Tables)

6 Months Ended

Jun. 30, 2019

Derivative Instruments and Hedging Activities Disclosure [Abstract]

Derivatives reflected in the consolidated balance sheet


	June 30, 2019
	Balance Sheet Location and Amount
	Current		Other		Current		Other
	Assets		Assets		Liabilities		Liabilities
Asset derivatives:
Fair value forward hydrocarbon commodity
contracts at gross valuation	$	240	$	—	$	—	$	—
Liability derivatives:
Fair value forward hydrocarbon commodity
contracts at gross valuation	—		—		236		—
Less counterparty offsets	—		—		—		—
As reported fair value contracts	$	240	$	—	$	236	$	—

•322 barrels per day of crude oil during January 2019 through April 2019;

•258 barrels per day of crude oil during May 2019;

•322 barrels per day of crude oil during June 2019 through August 2019; and

•258 barrels per day of crude oil during September 2019 through December 2019.


	December 31, 2018
	Balance Sheet Location and Amount
	Current		Other		Current		Other
	Assets		Assets		Liabilities		Liabilities
Asset derivatives:
Fair value forward hydrocarbon commodity
contracts at gross valuation	$	162	$	—	$	—	$	—
Liability derivatives:
Fair value forward hydrocarbon commodity
contracts at gross valuation	—		—		139		—
Less counterparty offsets	—		—		—		—
As reported fair value contracts	$	162	$	—	$	139	$	—

Derivatives reflected in the consolidated statement of operations

Forward month commodity contracts (derivatives) reflected in the accompanying unaudited condensed consolidated statements of operations were as follows for the periods indicated (in thousands):


	Gains (losses)
	Three Months Ended						Six Months Ended
	June 30,						June 30,
	2019		2018		2019		2018

Revenues – marketing	$	—	$	1	$	(20)	$	2

Fair value assets and liabilities

The following tables set forth, by level with the Level 1, 2 and 3 fair value hierarchy, the carrying values of our financial assets and liabilities at the dates indicated (in thousands):


	June 30, 2019
	Fair Value Measurements Using
	Quoted Prices
	in Active		Significant
	Markets for		Other		Significant
	Identical Assets		Observable		Unobservable
	and Liabilities		Inputs		Inputs		Counterparty
	(Level 1)		(Level 2)		(Level 3)		Offsets		Total

Derivatives:
Current assets	$	—	$	240	$	—	$	—	$	240
Current liabilities	—		(236)		—		—		(236)
Net value	$	—	$	4	$	—	$	—	$	4


	December 31, 2018
	Fair Value Measurements Using
	Quoted Prices
	in Active		Significant
	Markets for		Other		Significant
	Identical Assets		Observable		Unobservable
	and Liabilities		Inputs		Inputs		Counterparty
	(Level 1)		(Level 2)		(Level 3)		Offsets		Total
Derivatives:
Current assets	$	—	$	162	$	—	$	—	$	162
Current liabilities	—		(139)		—		—		(139)
Net value	$	—	$	23	$	—	$	—	$	23

Share-Based Compensation Plan (Tables)

6 Months Ended

Jun. 30, 2019

Share-based Payment Arrangement [Abstract]

Schedule of Share-based Payment Arrangement

Compensation expense recognized in connection with equity-based awards was as follows for the periods presented (in thousands):


	Three Months Ended						Six Months Ended
	June 30,						June 30,
	2019		2018		2019		2018

Compensation expense	$	74	$	3	$	197	$	3

Share-based Compensation, Activity

The following table presents restricted stock unit award activity for the periods indicated:


		Weighted-
		Average Grant
	Number of	Date Fair Value
	Shares	per Share ⁽¹⁾

Restricted stock unit awards at January 1, 2019	13,733	$	43.00
Granted ⁽²⁾	14,376	$	34.00
Vested	(5,729)	$	43.00
Forfeited	(325)	$	43.00
Restricted stock unit awards at June 30, 2019	22,055

_______________

(1) Determined by dividing the aggregate grant date fair value of awards by the number of awards issued.

(2) The aggregate grant date fair value of restricted stock unit awards issued during 2019 was $0.5 million based on a grant date market price of our common shares of $34.00 per share.

Performance Share Unit Awards

The following table presents performance share unit award activity for the periods indicated:


		Weighted-
		Average Grant
	Number of	Date Fair Value
	Shares	per Share ⁽¹⁾

Performance share unit awards at January 1, 2019	3,966	$	43.00
Granted ⁽²⁾	8,094	$	34.00
Performance factor decrease ⁽³⁾	(185)	$	43.00
Vested	—	$	—
Forfeited	(117)	$	43.00
Performance share unit awards at June 30, 2019	11,758

_______________

(1) Determined by dividing the aggregate grant date fair value of awards by the number of awards issued.

(3) The performance factor for awards granted during 2018 was lowered to 47.5 percent based upon a comparison of actual results for 2018 to performance goals.

Supplemental Cash Flow Information (Tables)

6 Months Ended

Jun. 30, 2019

Supplemental Cash Flow Elements [Abstract]

Supplemental Cash Flow Information

Supplemental cash flows and non-cash transactions were as follows for the periods indicated (in thousands):


	Six Months Ended
	June 30,
	2019		2018

Cash paid for interest	$	182	$	34
Cash paid for federal and state income taxes	233		210

Non-cash transactions:
Change in accounts payable related to property and equipment additions	(1,179)		(44)
Property and equipment acquired under finance leases	4,148		—
Issuance of common shares in asset acquisition (see Note 6)	392		—

Leases (Tables)

6 Months Ended

Jun. 30, 2019

Leases [Abstract]

Lease, Cost

The following table provides the components of lease expense for the period indicated (in thousands):


	Three Months		Six Months
	Ended		Ended
	June 30,		June 30,
	2019		2019
Finance lease cost:
Amortization of ROU assets	$	456	$	701
Interest on lease liabilities	81		127
Operating lease cost	717		1,579
Short-term lease cost	2,863		4,828


Total lease expense	$	4,117	$	7,235

The following table provides supplemental cash flow and other information related to leases for the period indicated (in thousands):


	Six Months
	Ended
	June 30,
	2019
Cash paid for amounts included in measurement of lease liabilities:
Operating cash flows from operating leases ⁽¹⁾	$	1,274
Operating cash flows from finance leases	94
Financing cash flows from finance leases	651

ROU assets obtained in exchange for new lease liabilities:
Finance leases	4,148
Operating leases	11,111

______________

(1) Amount is included in Other operating activities on the unaudited condensed consolidated cash flow statement.

The following table provides the lease term and discount rate for the period indicated:


						Six Months
						Ended
						June 30,
						2019
Weighted-average remaining lease term (years):
Finance leases						3.52
Operating leases						5.24

Weighted-average discount rate:
Finance leases						4.9%
Operating leases						5.0%

Assets And Liabilities, Lessee

The following table provides supplemental balance sheet information related to leases at the date indicated (in thousands):


	June 30,
	2019
Assets
Finance lease assets ⁽¹⁾	$	7,490
Operating lease ROU assets	10,093

Liabilities
Current
Finance lease liabilities	2,116
Operating lease liabilities	2,097
Noncurrent
Finance lease liabilities	5,473
Operating lease liabilities	7,999

______________

(1) Amount is included in Property and equipment, net on the unaudited condensed consolidated balance sheet.

Lessee, Operating Lease, Liability, Maturity

The following table provides maturities of undiscounted lease liabilities at June 30, 2019 (in thousands):


	Finance		Operating
	Lease		Lease

Remainder of 2019	$	1,213	$	1,280
2020	2,426		2,498
2021	2,426		2,102
2022	1,492		1,770
2023	642		1,668
Thereafter	37		2,112
Total lease payments	8,236		11,430
Less: Interest	(647)		(1,334)
Present value of lease liabilities	7,589		10,096
Less: Current portion of lease obligation	(2,116)		(2,097)
Total long-term lease obligation	$	5,473	$	7,999

Finance Lease, Liability, Maturity

The following table provides maturities of undiscounted lease liabilities at June 30, 2019 (in thousands):


	Finance		Operating
	Lease		Lease

Remainder of 2019	$	1,213	$	1,280
2020	2,426		2,498
2021	2,426		2,102
2022	1,492		1,770
2023	642		1,668
Thereafter	37		2,112
Total lease payments	8,236		11,430
Less: Interest	(647)		(1,334)
Present value of lease liabilities	7,589		10,096
Less: Current portion of lease obligation	(2,116)		(2,097)
Total long-term lease obligation	$	5,473	$	7,999

Schedule of Principal Contractual Commitments Outstanding Under Capital Leases

The following table provides maturities of undiscounted lease liabilities at December 31, 2018 (in thousands):


	Finance		Operating
	Lease		Lease

2019	$	1,052	$	4,242
2020	1,052		2,258
2021	1,052		2,107
2022	909		1,782
2023	451		1,495
Thereafter	—		1,488
Total lease payments	4,516		$	13,372
Less: Interest	(424)
Present value of lease liabilities	4,092
Less: Current portion of lease obligation	(883)
Total long-term lease obligation	$	3,209

Schedule of Principal Contractual Commitments Outstanding Under Operating Leases

The following table provides maturities of undiscounted lease liabilities at December 31, 2018 (in thousands):


	Finance		Operating
	Lease		Lease

2019	$	1,052	$	4,242
2020	1,052		2,258
2021	1,052		2,107
2022	909		1,782
2023	451		1,495
Thereafter	—		1,488
Total lease payments	4,516		$	13,372
Less: Interest	(424)
Present value of lease liabilities	4,092
Less: Current portion of lease obligation	(883)
Total long-term lease obligation	$	3,209

Commitments and Contingencies (Tables)

6 Months Ended

Jun. 30, 2019

Commitments and Contingencies Disclosure [Abstract]

Schedule of expenses and losses incurred but not reported and accrued workers' compensation


	June 30,		December 31,
	2019		2018

Pre-funded premiums for losses incurred but not reported	$	236	$	427
Accrued automobile and workers’ compensation claims	3,007		2,246

Schedule of accrued medical claims

Medical accrual amounts were as follows at the dates indicated (in thousands):


	June 30,		December 31,
	2019		2018

Accrued medical claims	$	1,387	$	1,181

Organization and Basis of Presentation (Details)	6 Months Ended
Organization and Basis of Presentation (Details)	Jun. 30, 2019 segment state
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Number of states in which entity operates \| state	48
Number of operating segments	2
Number of reportable segments	2

Summary of Significant Accounting Policies - Reconciliation of Cash and Restricted Cash (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018	Jun. 30, 2018	Dec. 31, 2017
Accounting Policies [Abstract]
Cash and cash equivalents	$ 127,670	$ 117,066
Restricted cash	4,876	0
Total cash, cash equivalents and restricted cash shown in the unaudited condensed consolidated statements of cash flows	$ 132,546	$ 117,066	$ 126,999	$ 109,393

Summary of Significant Accounting Policies - Reconciliation of Basic and Diluted Earnings (Losses) per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended				6 Months Ended
	Jun. 30, 2019	Mar. 31, 2019	Jun. 30, 2018	Mar. 31, 2018	Jun. 30, 2019	Jun. 30, 2018
Basic earnings per share:
Net earnings	$ 6	$ 4,908	$ 3,620	$ 1,138	$ 4,914	$ 4,758
Basic weighted average number of shares outstanding (in shares)	4,227		4,218		4,223	4,218
Basic earnings per share (in dollars per share)	$ 0		$ 0.86		$ 1.16	$ 1.13
Diluted weighted average number of shares outstanding:
Basic weighted average number of shares outstanding (in shares)	4,227		4,218		4,223	4,218
Total (in shares)	4,227		4,218		4,229	4,218
Diluted earnings per share (in dollars per share)	$ 0		$ 0.86		$ 1.16	$ 1.13
Restricted stock unit awards
Diluted weighted average number of shares outstanding:
Unit awards	0		0		6	0
Performance Unit Awards
Diluted weighted average number of shares outstanding:
Unit awards	0		0		0	0

Summary of Significant Accounting Policies - Letters of Credit Facility (Details) - Wells Fargo Bank - Standby Letter of Credit - USD ($)	Jun. 30, 2019	Dec. 31, 2018
Letter of Credit Facility [Abstract]
Line of credit facility, maximum borrowing capacity	$ 60,000,000.0
Stand-by letters of credit	$ 4,600,000	$ 4,600,000

Summary of Significant Accounting Policies - Property and Equipment (Details)	6 Months Ended
	Jun. 30, 2019
Minimum
Property, Plant and Equipment [Abstract]
Property and equipment, useful life	2 years
Maximum
Property, Plant and Equipment [Abstract]
Property and equipment, useful life	39 years

Summary of Significant Accounting Policies - Common Shares Outstanding (Details) - shares	3 Months Ended
	Jun. 30, 2019	Mar. 31, 2019
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance (in shares)	4,217,971	4,217,596
Issuance of shares in acquisition (in shares)	11,145
Vesting of restricted stock unit awards (in shares)	5,354	375
Shares withheld to cover taxes (in shares)	(883)
Ending balance (in shares)	4,233,587	4,217,971

Revenue Recognition - Revenue Disaggregation (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Disaggregation of Revenue [Line Items]
Total revenues from contracts with customers	$ 407,800	$ 432,991	$ 783,938	$ 806,694
Total revenues	484,433	452,417	929,601	839,673
Goods transferred at a point in time
Disaggregation of Revenue [Line Items]
Total revenues from contracts with customers	390,407	419,365	751,138	779,450
Services transferred over time
Disaggregation of Revenue [Line Items]
Total revenues from contracts with customers	17,393	13,626	32,800	27,244
Revenues from contracts with customers
Disaggregation of Revenue [Line Items]
Total revenues from contracts with customers	407,800	432,991	783,938	806,694
Other
Disaggregation of Revenue [Line Items]
Total revenues from contracts with customers	76,633	19,426	145,663	32,979
Marketing
Disaggregation of Revenue [Line Items]
Total revenues from contracts with customers	390,407	419,365	751,138	779,450
Total revenues	467,040	438,791	896,801	812,429
Marketing \| Goods transferred at a point in time
Disaggregation of Revenue [Line Items]
Total revenues from contracts with customers	390,407	419,365	751,138	779,450
Marketing \| Services transferred over time
Disaggregation of Revenue [Line Items]
Total revenues from contracts with customers	0	0	0	0
Marketing \| Revenues from contracts with customers
Disaggregation of Revenue [Line Items]
Total revenues from contracts with customers	390,407	419,365	751,138	779,450
Marketing \| Other
Disaggregation of Revenue [Line Items]
Total revenues from contracts with customers	76,633	19,426	145,663	32,979
Transportation
Disaggregation of Revenue [Line Items]
Total revenues from contracts with customers	17,393	13,626	32,800	27,244
Total revenues	17,393	13,626	32,800	27,244
Transportation \| Goods transferred at a point in time
Disaggregation of Revenue [Line Items]
Total revenues from contracts with customers	0	0	0	0
Transportation \| Services transferred over time
Disaggregation of Revenue [Line Items]
Total revenues from contracts with customers	17,393	13,626	32,800	27,244
Transportation \| Revenues from contracts with customers
Disaggregation of Revenue [Line Items]
Total revenues from contracts with customers	17,393	13,626	32,800	27,244
Transportation \| Other
Disaggregation of Revenue [Line Items]
Total revenues from contracts with customers	$ 0	$ 0	$ 0	$ 0

Revenue Recognition - Other Revenue (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Total revenues from contracts with customers	$ 407,800	$ 432,991	$ 783,938	$ 806,694
Accounting Standards Update 2014-09 \| Revenue gross-up
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Total revenues from contracts with customers	$ 223,043	$ 56,335	$ 465,166	$ 102,026

Prepayments and Other Current Assets (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]
Insurance premiums	$ 705	$ 677
Rents, licenses and other	1,123	880
Total	$ 1,828	$ 1,557

Property and Equipment (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
Property and Equipment (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018	Dec. 31, 2018
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 153,195		$ 153,195		$ 139,441
Less accumulated depreciation	(97,640)		(97,640)		(94,818)
Property and equipment, net	55,555		55,555		44,623
Total depreciation and amortization	4,284	$ 2,262	$ 7,873	$ 4,674
Minimum
Property, Plant and Equipment [Line Items]
Property and equipment, useful life			2 years
Maximum
Property, Plant and Equipment [Line Items]
Property and equipment, useful life			39 years
Assets not held under capital leases
Property, Plant and Equipment [Line Items]
Total depreciation and amortization	3,828	2,171	$ 7,172	4,493
Assets held under finance leases
Property, Plant and Equipment [Line Items]
Total depreciation and amortization	456	$ 91	701	$ 181
Tractors and trailers
Property, Plant and Equipment [Line Items]
Property and equipment, gross	106,046		$ 106,046		96,523
Tractors and trailers \| Minimum
Property, Plant and Equipment [Line Items]
Property and equipment, useful life			5 years
Tractors and trailers \| Maximum
Property, Plant and Equipment [Line Items]
Property and equipment, useful life			6 years
Tractors and trailers \| Assets held under finance leases
Property, Plant and Equipment [Line Items]
Property and equipment, gross	5,500		$ 5,500		4,700
Less accumulated depreciation	(1,200)		(1,200)		(700)
Field equipment
Property, Plant and Equipment [Line Items]
Property and equipment, gross	24,895		$ 24,895		20,725
Field equipment \| Minimum
Property, Plant and Equipment [Line Items]
Property and equipment, useful life			2 years
Field equipment \| Maximum
Property, Plant and Equipment [Line Items]
Property and equipment, useful life			20 years
Field equipment \| Assets held under finance leases
Property, Plant and Equipment [Line Items]
Property and equipment, gross	3,300		$ 3,300
Less accumulated depreciation	(200)		(200)
Buildings
Property, Plant and Equipment [Line Items]
Property and equipment, gross	16,003		$ 16,003		15,746
Buildings \| Minimum
Property, Plant and Equipment [Line Items]
Property and equipment, useful life			5 years
Buildings \| Maximum
Property, Plant and Equipment [Line Items]
Property and equipment, useful life			39 years
Office equipment
Property, Plant and Equipment [Line Items]
Property and equipment, gross	1,923		$ 1,923		1,863
Office equipment \| Minimum
Property, Plant and Equipment [Line Items]
Property and equipment, useful life			2 years
Office equipment \| Maximum
Property, Plant and Equipment [Line Items]
Property and equipment, useful life			5 years
Land
Property, Plant and Equipment [Line Items]
Property and equipment, gross	1,790		$ 1,790		1,790
Construction in progress
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 2,538		$ 2,538		$ 2,794

Assets Acquisition - Additional Information (Details) - EH Trucking		6 Months Ended
	May 06, 2019 USD ($) trailer truck $ / shares shares	Jun. 30, 2019 USD ($)
Schedule of Asset Acquisition [Line Items]
Consideration transferred	$ 6,434,000
Payments for asset acquisitions, cash	$ 5,611,000
Number of shares (in shares) \| shares	11,145
Value assigned to shares	$ 400,000
Contingent consideration, liability	$ 400,000
Number of tractor trailer trucks \| truck	39
Number of trailers \| trailer	53
Transaction sosts	$ 100,000
Share price \| $ / shares	$ 35.15
Maximum quarterly payment	$ 146,875
Range of outcomes, value, low	0
Range of outcomes, value, high	$ 587,500
Customer Relationships
Schedule of Asset Acquisition [Line Items]
Useful life	7 years
Amortization expense		$ 100,000

Assets Acquisition - Consideration Paid (Details) - EH Trucking $ in Thousands	May 06, 2019 USD ($)
Consideration:
Payments for asset acquisitions, cash	$ 5,611
Value of AE common shares issued	392
Contingent consideration arrangement	431
Fair value of total consideration transferred	6,434
Recognized amounts of identifiable assets acquired:
Property and equipment — tractors and trailers	4,408
Shop, office and telecommunication equipment	19
Intangible assets — customer relationships	2,007
Total purchase price	$ 6,434

Cash Deposits and Other Assets (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]
Insurance collateral deposits	$ 1,071	$ 1,453
Excess loss fund	821	1,916
Accumulated interest income	527	788
State collateral deposits	61	57
Materials and supplies	393	443
Total	$ 2,873	$ 4,657

Segment Reporting - Information Concerning Business Activities (Details) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019 USD ($)	Jun. 30, 2018 USD ($)	Jun. 30, 2019 USD ($) segment	Jun. 30, 2018 USD ($)
Segment Reporting [Abstract]
Number of reportable segments \| segment			2
Number of operating segments \| segment			2
Segment Reporting Information [Line Items]
Revenues	$ 484,433	$ 452,417	$ 929,601	$ 839,673
Segment operating earnings	(643)	4,298	4,610	5,375
Depreciation and amortization	4,284	2,262	7,873	4,674
Inventory liquidation (losses) gains	1,000
Tractors and Tank Storage and Throughput Arrangements
Segment Reporting Information [Line Items]
Property and equipment additions	3,600		4,100
Marketing
Segment Reporting Information [Line Items]
Revenues	467,040	438,791	896,801	812,429
Inventory liquidation (losses) gains		(1,900)	(3,500)	(2,500)
Transportation
Segment Reporting Information [Line Items]
Revenues	17,393	13,626	32,800	27,244
Reporting Segments
Segment Reporting Information [Line Items]
Revenues	484,433	452,417	929,601	839,673
Segment operating earnings	1,939	6,582	9,876	9,942
Depreciation and amortization	4,284	2,262	7,873	4,674
Property and equipment additions	4,770	1,849	13,121	2,715
Reporting Segments \| Marketing
Segment Reporting Information [Line Items]
Revenues	467,040	438,791	896,801	812,429
Segment operating earnings	962	5,772	8,060	8,730
Depreciation and amortization	2,304	1,336	4,426	2,833
Property and equipment additions	1,348	277	3,002	1,070
Reporting Segments \| Transportation
Segment Reporting Information [Line Items]
Revenues	17,393	13,626	32,800	27,244
Segment operating earnings	977	810	1,816	1,212
Depreciation and amortization	1,980	926	3,447	1,841
Property and equipment additions	3,422	1,572	10,119	1,645
Reporting Segments \| Oil and Gas
Segment Reporting Information [Line Items]
Revenues	0	0	0	0
Segment operating earnings	0	0	0	0
Depreciation and amortization	0	0	0	0
Property and equipment additions	$ 0	$ 0	$ 0	$ 0

Segment Reporting - Reconciliation of Segment Earnings to Earnings Before Income Taxes (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Reconciliation of Operating Profit (Loss) from Segments to Consolidated [Abstract]
Operating earnings	$ (643)	$ 4,298	$ 4,610	$ 5,375
Gain on dissolution of investment	75	0	573	0
Interest income	731	498	1,387	885
Interest expense	(117)	(15)	(182)	(34)
Earnings before income taxes	46	4,781	6,388	6,226
Reporting Segments
Reconciliation of Operating Profit (Loss) from Segments to Consolidated [Abstract]
Operating earnings	1,939	6,582	9,876	9,942
General and administrative
Reconciliation of Operating Profit (Loss) from Segments to Consolidated [Abstract]
Operating earnings	(2,582)	(2,284)	(5,266)	(4,567)
Segment reconciling items
Reconciliation of Operating Profit (Loss) from Segments to Consolidated [Abstract]
Gain on dissolution of investment	75	0	573	0
Interest income	731	498	1,387	885
Interest expense	$ (117)	$ (15)	$ (182)	$ (34)

Segment Reporting - Identifiable Assets by Industry Segment (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Segment Reconciliation [Abstract]
Total assets	$ 301,764	$ 278,870
Reporting Segments
Segment Reconciliation [Abstract]
Total assets	301,764	278,870
Reporting Segments \| Marketing
Segment Reconciliation [Abstract]
Total assets	113,554	119,370
Reporting Segments \| Transportation
Segment Reconciliation [Abstract]
Total assets	47,688	34,112
Cash and other
Segment Reconciliation [Abstract]
Total assets	$ 140,522	$ 125,388

Transactions with Affiliates (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Transactions with Affiliates [Abstract]
Billings to affiliates	$ 407,800	$ 432,991	$ 783,938	$ 806,694
Affiliated entities
Transactions with Affiliates [Abstract]
Affiliate billings to us	26	25	43	40
Billings to affiliates	1	1	2	3
Rentals paid to affiliate	$ 122	$ 122	$ 244	$ 244

Derivative Instruments and Fair Value Measurements - Narrative (Details) - Commodity Contract	6 Months Ended	12 Months Ended
	Jun. 30, 2019 barrel_of_oil_per_day contract	Dec. 31, 2018 barrel_of_oil_per_day contract
Derivative Instruments, Gain (Loss) [Line Items]
Number of contracts held \| contract	8	10
July 2019 through August 2019
Derivative Instruments, Gain (Loss) [Line Items]
Production	322
September 2019 through December 2019
Derivative Instruments, Gain (Loss) [Line Items]
Production	516	258
January 2020 through February 2020
Derivative Instruments, Gain (Loss) [Line Items]
Production	258
January through April 2019
Derivative Instruments, Gain (Loss) [Line Items]
Production		322
May 2019
Derivative Instruments, Gain (Loss) [Line Items]
Production		258
June 2019 through August 2019
Derivative Instruments, Gain (Loss) [Line Items]
Production		322
Reported Value Measurement
Derivative Instruments, Gain (Loss) [Line Items]
Number of contracts held \| contract	6

Derivative Instruments and Fair Value Measurements - Use of Derivative Instruments (Details) - Commodity Contract - Not Designated as Hedging Instrument - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Current Assets
Derivatives, Fair Value [Line Items]
Asset derivatives	$ 240	$ 162
Liability derivatives	0	0
Less counterparty offsets	0	0
As reported fair value contracts	240	162
Other Assets
Derivatives, Fair Value [Line Items]
Asset derivatives	0	0
Liability derivatives	0	0
Less counterparty offsets	0	0
As reported fair value contracts	0	0
Current Liabilities
Derivatives, Fair Value [Line Items]
Asset derivatives	0	0
Liability derivatives	236	139
Less counterparty offsets	0	0
As reported fair value contracts	236	139
Other Liabilities
Derivatives, Fair Value [Line Items]
Asset derivatives	0	0
Liability derivatives	0	0
Less counterparty offsets	0	0
As reported fair value contracts	$ 0	$ 0

Derivative Instruments and Fair Value Measurements - Gain (Loss) on Derivatives (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Revenues – marketing \| Not Designated as Hedging Instrument \| Commodity Contract
Derivative [Line Items]
Gain (loss) on derivative	$ 0	$ 1	$ (20)	$ 2

Derivative Instruments and Fair Value Measurements - Fair Value Measurements (Details) - Fair Value, Measurements, Recurring - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Derivatives:
Current assets	$ 240	$ 162
Current assets, counterparty offsets	0	0
Current liabilities	(236)	(139)
Current liabilities, counterparty offsets	0	0
Net value	4	23
Net value, counterparty offsets	0	0
Quoted Prices in Active Markets for Identical Assets and Liabilities (Level 1)
Derivatives:
Current assets	0	0
Current liabilities	0	0
Net value	0	0
Significant Other Observable Inputs (Level 2)
Derivatives:
Current assets	240	162
Current liabilities	(236)	(139)
Net value	4	23
Significant Unobservable Inputs (Level 3)
Derivatives:
Current assets	0	0
Current liabilities	0	0
Net value	$ 0	$ 0

Share-Based Compensation Plan (Details) - The 2018 LTIP - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018	Dec. 31, 2018	May 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares authorized (in shares)	98,213		98,213			150,000
Compensation expense	$ 74,000	$ 3,000	$ 197,000	$ 3,000
Accrued dividends	$ 15,602		$ 15,602		$ 9,533
Restricted stock unit awards
Number of Shares
Restricted stock unit awards at January 1, 2018 (in shares)			13,733
Granted (in shares)			14,376
Vested (in shares)			(5,729)
Forfeited (in shares)			325
Restricted stock unit awards at September 30, 2018 (in shares)	22,055		22,055
Weighted Average Grant Date Fair Value per Share
Restricted stock unit awards at January 1, 2018 (in dollars per share)			$ 43.00
Granted (in dollars per share)			34.00
Vested (in dollars per share)			43.00
Forfeited (in dollars per share)			$ 43.00
Aggregate grant date fair value awards issues			$ 500,000
Unrecognized compensation cost	$ 700,000		$ 700,000
Period for recognition for remaining compensation cost			1 year 9 months 18 days
Performance Unit Awards
Number of Shares
Restricted stock unit awards at January 1, 2018 (in shares)			3,966
Granted (in shares)			8,094
Performance factor decrease (in shares)			(185)
Vested (in shares)			0
Forfeited (in shares)			117
Restricted stock unit awards at September 30, 2018 (in shares)	11,758		11,758
Weighted Average Grant Date Fair Value per Share
Restricted stock unit awards at January 1, 2018 (in dollars per share)			$ 43.00
Granted (in dollars per share)			34.00
Performance factor decrease (in dollars per share)			43.00
Vested (in dollars per share)			0
Forfeited (in dollars per share)			$ 43.00
Aggregate grant date fair value awards issues			$ 300,000
Performance factor			47.50%
Unrecognized compensation cost	$ 400,000		$ 400,000
Period for recognition for remaining compensation cost			2 years 7 months 6 days
Performance Unit Awards \| Awards Issued During 2019
Weighted Average Grant Date Fair Value per Share
Performance factor			100000.00%

Supplemental Cash Flow Information (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018
Supplemental Cash Flow Elements [Abstract]
Cash paid for interest	$ 182	$ 34
Cash paid for federal and state income taxes	233	210
Non-cash transactions:
Change in accounts payable related to property and equipment additions	(1,179)	(44)
Property and equipment acquired under finance leases	4,148	0
Issuance of common shares in asset acquisition (see Note 6)	$ 392	$ 0

Leases (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
Leases (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Jun. 30, 2019	Jan. 01, 2019	Dec. 31, 2018
Leases [Abstract]
Operating lease right-of-use assets	$ 10,093	$ 10,093	$ 11,400
Finance lease liability	7,589	7,589	11,400
Lease, Cost [Abstract]
Amortization of ROU assets	456	701
Interest on lease liabilities	81	127
Operating lease cost	717	1,579
Short-term lease cost	2,863	4,828
Total lease expense	$ 4,117	7,235
Operating cash flows from operating leases		1,274
Operating cash flows from finance leases		94
Financing cash flows from finance leases		651
ROU assets obtained in exchange for new lease liabilities, Finance leases		4,148
ROU assets obtained in exchange for new lease liabilities, Operating leases		$ 11,111
Weighted-average remaining lease term (years), Finance leases	3 years 6 months 7 days	3 years 6 months 7 days
Weighted-average remaining lease term (years), Operating leases	5 years 2 months 26 days	5 years 2 months 26 days
Weighted-average discount rate, Finance leases	4.90%	4.90%
Weighted-average discount rate, Operating leases	5.00%	5.00%
Assets and Liabilities, Lessee [Abstract]
Finance lease assets	$ 7,490	$ 7,490
Operating lease ROU assets	10,093	10,093	11,400
Finance lease liabilities, Current	2,116	2,116		$ 883
Operating lease liabilities, Current	2,097	2,097
Finance lease liabilities, Noncurrent	5,473	5,473		3,209
Operating lease liabilities, Noncurrent	7,999	7,999
Finance Lease Liabilities, Payments
Remainder of 2019	1,213	1,213
2020	2,426	2,426
2021	2,426	2,426
2022	1,492	1,492
2023	642	642
Thereafter	37	37
Total lease payments	8,236	8,236
Less: Interest	(647)	(647)
Present value of lease liabilities	7,589	7,589	$ 11,400
Less: Current portion of lease obligation	(2,116)	(2,116)		(883)
Finance lease obligations	5,473	5,473		3,209
Operating Lease Liabilities, Payments Due
Remainder of 2019	1,280	1,280
2020	2,498	2,498
2021	2,102	2,102
2022	1,770	1,770
2023	1,668	1,668
Thereafter	2,112	2,112
Total lease payments	11,430	11,430
Less: Interest	(1,334)	(1,334)
Present value of lease liabilities	10,096	10,096
Less: Current portion of lease obligation	(2,097)	(2,097)
Total long-term lease obligation	$ 7,999	$ 7,999
Capital Lease Maturities
2019				1,052
2020				1,052
2021				1,052
2022				909
2023				451
Thereafter				0
Total lease payments				4,516
Less: Interest				(424)
Present value of lease liabilities				4,092
Less: Current portion of lease obligation				(883)
Total long-term lease obligation				3,209
Operating Lease Maturities
2019				4,242
2020				2,258
2021				2,107
2022				1,782
2023				1,495
Thereafter				1,488
Total lease payments				$ 13,372

Commitments and Contingencies - Pre-funded Insurance (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Commitments and Contingencies Disclosure [Abstract]
Pre-funded premiums for losses incurred but not reported	$ 236	$ 427
Accrued automobile and workers’ compensation claims	$ 3,007	$ 2,246

Commitments and Contingencies - Schedule of Accrued Medical Claims (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2019	Dec. 31, 2018
Commitments and Contingencies Disclosure [Abstract]
Umbrellas insurance coverage	$ 1,000
Aggregate medical claims for umbrella insurance coverage per calendar year	9,600
Accrued medical claims	$ 1,387	$ 1,181