Alpha Metallurgical Resources (AMR) 10-Q 7 Aug 20 2020 Q2 Quarterly report Financial data

Cover Page

Cover Page - shares	6 Months Ended
	Jun. 30, 2020	Jul. 31, 2020
Cover [Abstract]
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Jun. 30, 2020
Document Transition Report	false
Entity File Number	001-38735
Entity Registrant Name	CONTURA ENERGY, INC.
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	81-3015061
Entity Address, Address Line One	340 Martin Luther King Jr. Blvd.
Entity Address, City or Town	Bristol
Entity Address, State or Province	TN
Entity Address, Postal Zip Code	37620
City Area Code	423
Local Phone Number	573-0300
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Title of 12(b) Security	Common Stock
Trading Symbol	CTRA
Security Exchange Name	NYSE
Entity Common Stock, Shares Outstanding		18,308,838
Entity Central Index Key	0001704715
Current Fiscal Year End Date	--12-31
Document Fiscal Year Focus	2020
Document Fiscal Period Focus	Q2
Amendment Flag	false

CONDENSED CONSOLIDATED STATEMEN

CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (Unaudited) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Revenues:
Coal revenues	$ 410,614	$ 653,828	$ 878,981	$ 1,260,788
Other revenues	1,224	2,378	3,317	4,532
Total revenues	411,838	656,206	882,298	1,265,320
Costs and expenses:
Cost of coal sales (exclusive of items shown separately below)	383,279	496,746	781,139	1,012,440
Depreciation, depletion and amortization	49,262	62,814	103,727	124,085
Accretion on asset retirement obligations	7,304	6,847	14,679	13,079
Amortization of acquired intangibles, net	2,096	(343)	2,961	(7,026)
Asset impairment and restructuring	184,173	5,826	217,882	5,826
Selling, general and administrative expenses (exclusive of depreciation, depletion and amortization shown separately above)	12,028	14,783	27,509	35,734
Merger-related costs	0	156	0	987
Total other operating (income) loss:
Mark-to-market adjustment for acquisition-related obligations	(2,052)	1,014	(17,049)	2,950
Other (income) expense	(124)	1,414	(704)	(7,485)
Total costs and expenses	635,966	589,257	1,130,144	1,180,590
(Loss) income from operations	(224,128)	66,949	(247,846)	84,730
Other income (expense):
Interest expense	(18,814)	(16,077)	(36,419)	(31,232)
Interest income	5,533	1,885	6,511	3,821
Loss on modification and extinguishment of debt	0	(26,459)	0	(26,459)
Equity loss in affiliates	(1,047)	(2,475)	(1,790)	(2,959)
Miscellaneous loss, net	188	(523)	(720)	(1,389)
Total other expense, net	(14,140)	(43,649)	(32,418)	(58,218)
(Loss) income from continuing operations before income taxes	(238,268)	23,300	(280,264)	26,512
Income tax (expense) benefit	(33)	1,000	2,155	5,778
Net (loss) income from continuing operations	(238,301)	24,300	(278,109)	32,290
Discontinued operations:
Loss from discontinued operations before income taxes	0	(163,867)	0	(165,457)
Income tax benefit from discontinued operations	0	25,906	0	26,321
Loss from discontinued operations	0	(137,961)	0	(139,136)
Net loss	$ (238,301)	$ (113,661)	$ (278,109)	$ (106,846)
Basic loss per common share:
(Loss) income from continuing operations (in dollars per share)	$ (13.02)	$ 1.27	$ (15.22)	$ 1.70
Loss from discontinued operations (in dollars per share)	0	(7.21)	0	(7.32)
Net loss (in dollars per share)	(13.02)	(5.94)	(15.22)	(5.62)
Diluted loss per common share:
(Loss) income from continuing operations (in dollars per share)	(13.02)	1.25	(15.22)	1.66
Loss from discontinuing operations (in dollars per share)	0	(7.10)	0	(7.14)
Net loss (in dollars per share)	$ (13.02)	$ (5.85)	$ (15.22)	$ (5.48)
Weighted average shares - basic (in shares)	18,304,853	19,123,705	18,275,382	19,009,643
Weighted average shares - diluted (in shares)	18,304,853	19,420,471	18,275,382	19,480,183
Revenue from Contract with Customer, Product and Service [Extensible List]	us-gaap:PublicUtilitiesInventoryCoalMember	us-gaap:PublicUtilitiesInventoryCoalMember	us-gaap:PublicUtilitiesInventoryCoalMember	us-gaap:PublicUtilitiesInventoryCoalMember

CONDENSED CONSOLIDATED STATEM_2

CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE LOSS (Unaudited) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Statement of Other Comprehensive Income [Abstract]
Net loss	$ (238,301)	$ (113,661)	$ (278,109)	$ (106,846)
Employee benefit plans:
Amortization of and adjustments to employee benefit costs	(7,121)	1,187	(11,131)	1,426
Income tax expense	0	(310)	0	(372)
Total other comprehensive (loss) income, net of tax	(7,121)	877	(11,131)	1,054
Total comprehensive loss	$ (245,422)	$ (112,784)	$ (289,240)	$ (105,792)

CONDENSED CONSOLIDATED BALANCE

CONDENSED CONSOLIDATED BALANCE SHEETS (Unaudited) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Current assets:
Cash and cash equivalents	$ 238,438	$ 212,793
Trade accounts receivable, net of allowance for doubtful accounts of $793 and $0 as of June 30, 2020 and December 31, 2019	183,820	244,666
Inventories, net	143,198	162,659
Prepaid expenses and other current assets	122,354	91,361
Total current assets	687,810	711,479
Property, plant, and equipment, net of accumulated depreciation and amortization of $351,561 and $314,276 as of June 30, 2020 and December 31, 2019	423,367	583,262
Owned and leased mineral rights, net of accumulated depletion and amortization of $34,961 and $27,877 as of June 30, 2020 and December 31, 2019	495,303	523,141
Other acquired intangibles, net of accumulated amortization of $35,717 and $32,686 as of June 30, 2020 and December 31, 2019	103,439	125,145
Long-term restricted cash	109,930	122,524
Deferred income taxes	0	33,065
Other non-current assets	220,389	204,207
Total assets	2,040,238	2,302,823
Current liabilities:
Current portion of long-term debt	30,390	28,485
Trade accounts payable	70,027	98,746
Acquisition-related obligations – current	30,019	33,639
Accrued expenses and other current liabilities	161,453	154,282
Total current liabilities	291,889	315,152
Long-term debt	597,706	564,481
Acquisition-related obligations - long-term	18,283	46,259
Workers’ compensation and black lung obligations	266,390	260,778
Pension obligations	198,582	204,086
Asset retirement obligations	207,001	184,130
Deferred income taxes	389	422
Other non-current liabilities	50,583	31,393
Total liabilities	1,630,823	1,606,701
Commitments and Contingencies (Note 17)
Stockholders’ Equity
Preferred stock - par value $0.01, 5.0 million shares authorized, none issued	0	0
Common stock - par value $0.01, 50.0 million shares authorized, 20.6 million issued and 18.3 million outstanding at June 30, 2020 and 20.5 million issued and 18.2 million outstanding at December 31, 2019	206	205
Additional paid-in capital	777,650	775,707
Accumulated other comprehensive loss	(69,747)	(58,616)
Treasury stock, at cost: 2.3 million shares at June 30, 2020 and December 31, 2019	(106,955)	(107,984)
Retained earnings	(191,739)	86,810
Total stockholders’ equity	409,415	696,122
Total liabilities and stockholders’ equity	$ 2,040,238	$ 2,302,823

CONDENSED CONSOLIDATED BALANC_2

CONDENSED CONSOLIDATED BALANCE SHEETS (Unaudited) - Parenthetical - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Statement of Financial Position [Abstract]
Allowance for doubtful accounts	$ 793	$ 0
Property, plant and equipment, accumulated amortization, depreciation and amortization	351,561	314,276
Owned and lease mineral rights, accumulated depletion and amortization	34,961	27,877
Other acquired intangibles, accumulated amortization	$ 35,717	$ 32,686
Preferred stock, par value (in dollars per share)	$ 0.01	$ 0.01
Preferred stock, shares authorized (in shares)	5,000,000	5,000,000
Preferred stock, shares issued (in shares)	0	0
Common stock, par value (in dollars per share	$ 0.01	$ 0.01
Common stock, shares authorized (in shares)	50,000,000	50,000,000
Common stock, shares issued (in shares)	20,600,000	20,500,000
Common stock, shares outstanding (in shares)	18,300,000	18,200,000
Treasury stock, shares at cost (in shares)	2,300,000	2,300,000

CONDENSED CONSOLIDATED STATEM_3

CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019
Operating activities:
Net loss	$ (278,109)	$ (106,846)
Adjustments to reconcile net loss to net cash provided by operating activities:
Depreciation, depletion and amortization	103,727	269,997
Amortization of acquired intangibles, net	2,961	(7,026)
Accretion of acquisition-related obligations discount	2,227	3,220
Amortization of debt issuance costs and accretion of debt discount	7,389	6,724
Mark-to-market adjustment for acquisition-related obligations	(17,049)	2,950
(Gain) loss on disposal of assets	(755)	1,372
Gain on assets acquired in an exchange transaction	0	(9,083)
Loss on modification and extinguishment of debt	0	26,459
Asset impairment and restructuring	217,882	22,294
Accretion on asset retirement obligations	14,679	13,079
Employee benefit plans, net	10,605	9,564
Deferred income taxes	33,032	(33,623)
Stock-based compensation	3,121	4,774
Equity loss in affiliates	1,790	2,959
Other, net	92	405
Changes in operating assets and liabilities	(22,654)	(90,086)
Net cash provided by operating activities	78,938	117,133
Investing activities:
Capital expenditures	(91,090)	(83,882)
Proceeds on disposal of assets	1,285	1,048
Purchases of investment securities	(18,607)	(9,899)
Maturity of investment securities	10,653	21,316
Capital contributions to equity affiliates	(2,416)	(4,807)
Other, net	47	93
Net cash used in investing activities	(100,128)	(76,131)
Financing activities:
Proceeds from borrowings on debt	57,500	544,946
Principal repayments of debt	(29,559)	(550,000)
Principal repayments of notes payable	(574)	(821)
Principal repayments of financing lease obligations	(1,614)	(2,100)
Debt issuance costs	0	(5,839)
Common stock repurchases and related expenses	(155)	(4,874)
Other, net	0	914
Net cash provided by (used in) financing activities	25,598	(17,774)
Net increase in cash and cash equivalents and restricted cash	4,408	23,228
Cash and cash equivalents and restricted cash at beginning of period	347,680	477,246
Cash and cash equivalents and restricted cash at end of period	352,088	500,474
Reconciliation of Cash and Cash Equivalents and Restricted Cash
Total cash and cash equivalents and restricted cash shown in the Condensed Consolidated Statements of Cash Flows	$ 352,088	$ 500,474

CONDENSED CONSOLIDATED STATEM_4

CONDENSED CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY (Unaudited) - USD ($) $ in Thousands	Total	Common Stock	Additional Paid-in Capital	Accumulated Other Comprehensive Income (Loss)	Treasury Stock at Cost	Retained Earnings	Cumulative effect	Cumulative effectRetained Earnings
Beginning balance at Dec. 31, 2018	$ 1,071,140	$ 202	$ 761,301	$ (23,130)	$ (70,362)	$ 403,129
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	6,815					6,815
Other comprehensive income (loss), net	177			177
Stock-based compensation and net issuance of common stock for share vesting	6,377		6,377
Exercise of stock options	306	1	305
Common stock repurchases and related expenses	(4,171)				(4,171)
Ending balance at Mar. 31, 2019	1,080,644	203	767,983	(22,953)	(74,533)	409,944
Beginning balance at Dec. 31, 2018	1,071,140	202	761,301	(23,130)	(70,362)	403,129
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	(106,846)
Other comprehensive income (loss), net	1,054
Ending balance at Jun. 30, 2019	967,221	204	768,046	(22,076)	(75,236)	296,283
Beginning balance at Dec. 31, 2018	1,071,140	202	761,301	(23,130)	(70,362)	403,129
Ending balance at Dec. 31, 2019	$ 696,122	205	775,707	(58,616)	(107,984)	86,810	$ (440)	$ (440)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Accounting Standards Update [Extensible List]	us-gaap:AccountingStandardsUpdate201613Member
Beginning balance at Mar. 31, 2019	$ 1,080,644	203	767,983	(22,953)	(74,533)	409,944
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	(113,661)					(113,661)
Other comprehensive income (loss), net	877			877
Stock-based compensation and net issuance of common stock for share vesting	(545)		(545)
Exercise of stock options	590	1	589
Warrant exercises	19		19
Common stock repurchases and related expenses	(703)				(703)
Ending balance at Jun. 30, 2019	967,221	204	768,046	(22,076)	(75,236)	296,283
Beginning balance at Dec. 31, 2019	696,122	205	775,707	(58,616)	(107,984)	86,810	(440)	(440)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	(39,808)					(39,808)
Other comprehensive income (loss), net	(4,010)			(4,010)
Stock-based compensation and net issuance of common stock for share vesting	900		900
Common stock repurchases and related expenses	1,071				1,071
Ending balance at Mar. 31, 2020	653,835	205	776,607	(62,626)	(106,913)	46,562
Beginning balance at Dec. 31, 2019	696,122	205	775,707	(58,616)	(107,984)	86,810	$ (440)	$ (440)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	(278,109)
Other comprehensive income (loss), net	(11,131)
Ending balance at Jun. 30, 2020	409,415	206	777,650	(69,747)	(106,955)	(191,739)
Beginning balance at Mar. 31, 2020	653,835	205	776,607	(62,626)	(106,913)	46,562
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	(238,301)					(238,301)
Other comprehensive income (loss), net	(7,121)			(7,121)
Stock-based compensation and net issuance of common stock for share vesting	1,044	1	1,043
Common stock repurchases and related expenses	(42)				(42)
Ending balance at Jun. 30, 2020	$ 409,415	$ 206	$ 777,650	$ (69,747)	$ (106,955)	$ (191,739)

Business and Basis of Presentat

Business and Basis of Presentation	6 Months Ended
	Jun. 30, 2020
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Business and Basis of Presentation	Business and Basis of Presentation Basis of Presentation Together, the condensed consolidated statements of operations, comprehensive loss, balance sheets, cash flows and stockholders’ equity for the Company are referred to as the “Condensed Consolidated Financial Statements.” The Condensed Consolidated Financial Statements are also referenced across periods as “Condensed Consolidated Statements of Operations,” “Condensed Consolidated Statements of Comprehensive Loss,” “Condensed Consolidated Balance Sheets,” “Condensed Consolidated Statements of Cash Flows,” and “Condensed Consolidated Statements of Stockholders’ Equity.” The Condensed Consolidated Financial Statements include all wholly-owned subsidiaries’ results of operations for the three and six months ended June 30, 2020 and 2019. All significant intercompany transactions have been eliminated in consolidation. The accompanying interim Condensed Consolidated Financial Statements are unaudited and have been prepared in accordance with accounting principles generally accepted in the United States (“U.S. GAAP”) and in accordance with the rules and regulations of the United States Securities and Exchange Commission (“SEC”) for Form 10-Q. Such rules and regulations allow the omission of certain information and footnote disclosures normally included in the financial statements prepared in accordance with U.S. GAAP as long as the financial statements are not misleading. In the opinion of management, these interim Condensed Consolidated Financial Statements reflect all normal and recurring adjustments necessary for a fair presentation of the results for the periods presented. Results of operations for the three and six months ended June 30, 2020 are not necessarily indicative of the results to be expected for the year ending December 31, 2020 or any other period. These interim Condensed Consolidated Financial Statements should be read in conjunction with the Company’s Consolidated Financial Statements and related notes included in the Company’s Annual Report on Form 10-K for the year ended December 31, 2019. Liquidity Risks and Uncertainties Weak market conditions and depressed coal prices have resulted in operating losses. If market conditions do not improve, the Company may experience continued operating losses and cash outflows in the coming quarters, which would adversely affect its liquidity. The Company may need to raise additional funds more quickly if market conditions deteriorate, and may not be able to do so in a timely fashion, or at all. The Company believes it will have sufficient liquidity to meet its working capital requirements, anticipated capital expenditures, debt service requirements, acquisition-related obligations, and reclamation obligations for the 12 months subsequent to the issuance of these financial statements. The Company relies on a number of assumptions in budgeting for future activities. These include the costs for mine development to sustain capacity of its operating mines, cash flows from operations, effects of regulation and taxes by governmental agencies, mining technology improvements and reclamation costs. These assumptions are inherently subject to significant business, political, economic, regulatory, environmental and competitive uncertainties, contingencies and risks, all of which are difficult to predict and many of which are beyond the Company’s control. Therefore, the cash on hand and from future operations will be subject to any significant changes in these assumptions. COVID-19 Pandemic In the first quarter of 2020, the COVID-19 virus was declared a pandemic by the World Health Organization. The COVID-19 pandemic has had negative impacts on the Company’s business, results of operations, financial condition and cash flows. A continued period of reduced demand for the Company’s products could have significant adverse consequences. The full extent of the impact of the COVID-19 pandemic on the Company’s operational and financial performance will depend on certain developments, including the duration and spread of the outbreak, its impact on its customers and suppliers and the range of governmental and community reactions to the pandemic, which are still uncertain and cannot be fully predicted at this time. In response to the COVID-19 pandemic, on March 27, 2020, the “Coronavirus Aid, Relief, and Economic Security Act” (“CARES Act”) was enacted into law. As a result, the Company expects accelerated refunds of previously generated alternative minimum tax (“AMT”) credits from the Internal Revenue Service (“IRS”) as further described in Note 14 and expects to defer 2020 employer payroll taxes incurred after the date of enactment to future years. The Company will continue to evaluate the implications of the remaining provisions of the CARES Act. As further described in Note 10, on March 20, 2020, the Company borrowed funds under a senior secured asset-based revolving credit facility. The funds were borrowed to augment the Company’s short-term operational flexibility in the face of uncertainty created by the current spread of the COVID-19 virus and its potential effects. On April 3, 2020, the Company announced temporary operational changes in response to market conditions, existing coal inventory levels, and customer deferrals due to concern around the global economic impact of the COVID-19 pandemic. Beginning April 3, 2020, the majority of the Company’s operations were idled for a period of approximately 30 days, with some sites idling for shorter periods of time and a few continuing to operate at a near-normal rate of production. Location-specific schedules were implemented based on existing customer agreements, current inventory levels, and anticipated customer demand. Certain preparation plants, docks, and loadouts continued to operate to support business needs and customer shipments. As of May 4, 2020, all Company sites were back to nearly normal staffing levels and operating capacity with additional precautions in place to help reduce the risk of exposure to COVID-19. Refer to Note 8 for discussion of certain strategic actions during the three months ended June 30, 2020 with respect to two thermal coal mining complexes in an effort to strengthen the Company’s financial performance. The Company will continue to evaluate market conditions amid the continuing uncertainty of the COVID-19 pandemic and expects to adjust its operations accordingly. Recently Adopted Accounting Guidance Credit Losses: In June 2016, the Financial Accounting Standards Board (the “FASB”) issued Accounting Standards Update (“ASU”) 2016-13, Credit Losses (“ASU 2016-13”). ASU 2016-13 Fair Value Measurement : In August 2018, the FASB issued ASU 2018-13, Fair Value Measurement (Topic 820), Disclosure Framework-Changes to the Disclosure Requirements for Fair Value Measurement (“ASU 2018-13”). The amendments in this update modify the disclosure requirements for fair value measurements. The Company adopted ASU 2018-13 during the first quarter of 2020. The adoption of this ASU did not have a material impact on the Company's Condensed Consolidated Financial Statements and related disclosures. Income Taxes : In December 2019, the FASB issued ASU 2019-12, Income Taxes (Topic 740): Simplifying the Accounting for Income Taxes (“ASU 2019-12”). The amendments in this update simplify the accounting for income taxes by removing certain exceptions to the general principles in Topic 740. The amendments also improve consistent application of and simplify U.S. GAAP for other areas of Topic 740 by clarifying and amending existing guidance. The Company adopted ASU 2019-12 during the first quarter of 2020. The adoption of this ASU did not have a material impact on the Company's Condensed Consolidated Financial Statements and related disclosures. Reference Rate Reform : In March 2020, the FASB issued ASU 2020-04, Reference Rate Reform (Topic 848): Facilitation of Effects of Reference Rate Reform on Financial Reporting (“ASU 2020-04”). The amendments in this update provide optional expedients and exceptions, if certain criteria are met, for applying U.S. GAAP to contracts, hedging relationships, and other transactions that reference LIBOR or another reference rate expected to be discontinued because of reference rate reform. The expedients and exceptions provided by the amendments do not apply to contract modifications made and hedging relationships entered into or evaluated after December 31, 2022, except for hedging relationships existing as of December 31, 2022, that an entity has elected certain optional expedients for and that are retained through the end of the hedging relationship. The Company adopted ASU 2020-04, with respect to topics in Accounting Standards Codification (“ASC”) 310 Receivables , ASC 470 Debt , ASC 815 Derivatives and Hedging and ASC 842 Leases , during the first quarter of 2020. The adoption of this ASU did not have a material impact on the Company's Condensed Consolidated Financial Statements and related disclosures. Recent Accounting Guidance Issued Not Yet Effective Defined Benefit Plans : In August 2018, the FASB issued ASU 2018-14, Compensation—Retirement Benefits—Defined Benefit Plans—General (Subtopic 715-20) Disclosure Framework—Changes to the Disclosure Requirements for Defined Benefit Plans (“ASU 2018-14”). The amendments in this update modify the disclosure requirements for employers that sponsor

Discontinued Operations

Discontinued Operations	6 Months Ended
	Jun. 30, 2020
Discontinued Operations and Disposal Groups [Abstract]
Discontinued Operations	Discontinued Operations Discontinued operations in the prior period consisted of activity related to the transactions with Blackjewel and ESM stemming from the sale of assets in the Company’s former PRB operations. On May 29, 2020, Contura Coal West, LLC and Contura Wyoming Land, LLC merged with certain subsidiaries of ESM and survived as wholly-owned subsidiaries of ESM. Contura Coal West, LLC holds, and will continue to hold, the mining permits for the Western Mines, which have been under the operational control of ESM since October 2019 pursuant to the ESM Transaction. Pursuant to terms of the transaction, the Company received from ESM approximately $625 in consideration for assets owned by Contura Coal West, LLC but not previously conveyed. There were no discontinued operations for the three and six months ended June 30, 2020 and as of June 30, 2020. The major components of net loss from discontinued operations in the Condensed Consolidated Statements of Operations for the three and six months ended June 30, 2019 are as follows: Three Months Ended June 30, 2019 Six Months Ended June 30, 2019 Revenues: Total revenues (1) $ 52 $ 148 Costs and expenses: Depreciation, depletion and amortization (2) $ 145,913 $ 145,913 Asset impairment (3) $ 16,468 $ 16,468 Other expenses $ 1,349 $ 2,939 Other non-major expense (income) items, net $ 189 $ 285 (1) Total revenues for the three and six months ended June 30, 2019 consisted entirely of other revenues. (2) The depreciation, depletion and amortization is related to an increase in the Company’s estimate of its asset retirement obligations with respect to the Western Mines as a result of the Blackjewel Chapter 11 bankruptcy filing on July 1, 2019. The Company remeasured its asset retirement obligations based on the expectation that the mining permits would not transfer to Blackjewel and Blackjewel would be unable to perform its contractual obligation to reclaim the properties. The increase in the asset retirement obligation was recorded to expense as the Company no longer owned the underlying mining assets. (3) The asset impairment is primarily related to the write-off of a tax receivable. The Company was considered to be the primary obligor for certain taxes but for which Blackjewel was contractually obligated to pay. During the three months ended June 30, 2019, the Company recorded an impairment charge for the offsetting receivable from Blackjewel as a result of the Blackjewel bankruptcy filing. Refer to Note 5 for net loss per share information related to discontinued operations. There were no major components of asset and liabilities that are classified as discontinued operations in the Condensed Consolidated Balance Sheet as of December 31, 2019. The major components of cash flows related to discontinued operations are as follows: Three Months Ended June 30, 2019 Six Months Ended June 30, 2019 Other significant operating non-cash items related to discontinued operations: Depreciation, depletion and amortization $ 145,913 $ 145,913

Revenue

Revenue	6 Months Ended
	Jun. 30, 2020
Revenue from Contract with Customer [Abstract]
Revenue	Revenue Disaggregation of Revenue from Contracts with Customers The following tables disaggregate the Company’s coal revenues by product category and by market to depict how the nature, amount, timing, and uncertainty of the Company’s coal revenues and cash flows are affected by economic factors: Three Months Ended June 30, 2020 Met Thermal Total Export coal revenues $ 241,905 $ 10,369 $ 252,274 Domestic coal revenues 82,903 75,437 158,340 Total coal revenues $ 324,808 $ 85,806 $ 410,614 Three Months Ended June 30, 2019 Met Thermal Total Export coal revenues $ 345,576 $ 17,262 $ 362,838 Domestic coal revenues 156,053 134,937 290,990 Total coal revenues $ 501,629 $ 152,199 $ 653,828 Six Months Ended June 30, 2020 Met Thermal Total Export coal revenues $ 491,260 $ 17,752 $ 509,012 Domestic coal revenues 197,591 172,378 369,969 Total coal revenues $ 688,851 $ 190,130 $ 878,981 Six Months Ended June 30, 2019 Met Thermal Total Export coal revenues $ 679,762 $ 26,382 $ 706,144 Domestic coal revenues 292,311 262,333 554,644 Total coal revenues $ 972,073 $ 288,715 $ 1,260,788 Performance Obligations The following table includes estimated revenue expected to be recognized in the future related to performance obligations that are unsatisfied as of June 30, 2020. Remainder of 2020 2021 2022 2023 2024 2025 Total Estimated coal revenues $ 223,350 $ 259,065 $ 191,278 $ — $ — $ — $ 673,693

Accumulated Other Comprehensive

Accumulated Other Comprehensive (Loss) Income	6 Months Ended
	Jun. 30, 2020
Equity [Abstract]
Accumulated Other Comprehensive (Loss) Income	Accumulated Other Comprehensive (Loss) Income The following tables summarize the changes to accumulated other comprehensive (loss) income during the six months ended June 30, 2020 and 2019: Balance January 1, 2020 Other comprehensive (loss) income before reclassifications Amounts reclassified from accumulated other comprehensive (loss) income Balance June 30, 2020 Employee benefit costs $ (58,616) $ (14,154) $ 3,023 $ (69,747) Balance January 1, 2019 Other comprehensive (loss) income before reclassifications Amounts reclassified from accumulated other comprehensive (loss) income Balance June 30, 2019 Employee benefit costs $ (23,130) $ 713 $ 341 $ (22,076) The following table summarizes the amounts reclassified from accumulated other comprehensive (loss) income and the Condensed Consolidated Statements of Operations line items affected by the reclassification during the three and six months ended June 30, 2020 and 2019: Details about accumulated other comprehensive (loss) income components Amounts reclassified from accumulated other comprehensive (loss) income Affected line item in the Condensed Consolidated Statements of Operations Three Months Ended June 30, Six Months Ended June 30, 2020 2019 2020 2019 Employee benefit costs: Amortization of actuarial loss (1) $ 934 $ 222 $ 1,728 $ 461 Miscellaneous loss, net Settlement (1) 95 — 1,295 — Miscellaneous loss, net Total before income tax $ 1,029 $ 222 $ 3,023 $ 461 Income tax expense — (58) — (120) Income tax (expense) benefit Total, net of income tax $ 1,029 $ 164 $ 3,023 $ 341 (1) These accumulated other comprehensive (loss) income components are included in the computation of net periodic benefit costs for certain employee benefit plans. Refer to Note 15.

Net (Loss) Income Per Share

Net (Loss) Income Per Share	6 Months Ended
	Jun. 30, 2020
Earnings Per Share [Abstract]
Net (Loss) Income Per Share	Net (Loss) Income Per Share The number of shares used to calculate basic net (loss) income per common share is based on the weighted average number of the Company’s outstanding common shares during the respective period. The number of shares used to calculate diluted net (loss) income per common share is based on the number of common shares used to calculate basic net (loss) income per share plus the dilutive effect of stock options and other stock-based instruments held by the Company’s employees and directors during the period, and the Company’s outstanding Series A warrants. The warrants become dilutive for net income per common share calculations when the market price of the Company’s common stock exceeds the exercise price. For the three and six months ended June 30, 2019, 95,162 stock options and 131,707 restricted stock units were excluded, respectively, from the computation of dilutive net income per share because they would have been anti-dilutive. These potential shares could dilute net income per share in the future. In periods of net loss, all potentially dilutive shares are excluded and the number of shares used to calculate diluted earnings per share is the same as basic earnings per share. The following table presents the net (loss) income per common share for the three and six months ended June 30, 2020 and 2019: Three Months Ended June 30, Six Months Ended June 30, 2020 2019 2020 2019 Net loss (Loss) income from continuing operations $ (238,301) $ 24,300 $ (278,109) $ 32,290 Loss from discontinued operations — (137,961) — (139,136) Net loss $ (238,301) $ (113,661) $ (278,109) $ (106,846) Basic Weighted average common shares outstanding - basic 18,304,853 19,123,705 18,275,382 19,009,643 Basic loss per common share: (Loss) income from continuing operations $ (13.02) $ 1.27 $ (15.22) $ 1.70 Loss from discontinued operations — (7.21) — (7.32) Net loss $ (13.02) $ (5.94) $ (15.22) $ (5.62) Diluted Weighted average common shares outstanding - basic 18,304,853 19,123,705 18,275,382 19,009,643 Diluted effect of warrants — 143,571 — 179,807 Diluted effect of stock options — 74,278 — 139,956 Diluted effect of restricted share units, restricted stock shares and performance-based restricted share units — 78,917 — 150,777 Weighted average common shares outstanding - diluted 18,304,853 19,420,471 18,275,382 19,480,183 Diluted loss per common share: (Loss) income from continuing operations $ (13.02) $ 1.25 $ (15.22) $ 1.66 Loss from discontinued operations — (7.10) — (7.14) Net loss $ (13.02) $ (5.85) $ (15.22) $ (5.48)

Inventories, Net

Inventories, Net	6 Months Ended
	Jun. 30, 2020
Inventory Disclosure [Abstract]
Inventories, Net	Inventories, net Inventories, net consisted of the following: June 30, 2020 December 31, 2019 Raw coal $ 25,962 $ 30,274 Saleable coal 90,572 105,092 Materials, supplies and other, net (1) 26,664 27,293 Total inventories, net $ 143,198 $ 162,659

Acquired Intangibles

Acquired Intangibles	6 Months Ended
	Jun. 30, 2020
Goodwill and Intangible Assets Disclosure [Abstract]
Acquired Intangibles	Acquired IntangiblesThe Company has recognized assets for acquired above market-priced coal supply agreements and acquired mine permits and liabilities for acquired below market-priced coal supply agreements. The coal supply agreements were valued based on the present value of the difference between the expected net contractual cash flows based on the stated contract terms, and the estimated net contractual cash flows derived from applying forward market prices at the Merger or acquisition date for new contracts of similar terms and conditions. The acquired mine permits were valued based on the replacement cost and lost profits method as of the Merger date. The balances and respective balance sheet classifications of such assets and liabilities as of June 30, 2020 and December 31, 2019, net of accumulated amortization, are set forth in the following tables: June 30, 2020 Assets (1) Liabilities (2) Net Total Coal supply agreements, net $ 330 $ (1,745) $ (1,415) Acquired mine permits, net 103,109 — 103,109 Total $ 103,439 $ (1,745) $ 101,694 December 31, 2019 Assets (1) Liabilities (2) Net Total Coal supply agreements, net $ 917 $ (6,018) $ (5,101) Acquired mine permits, net 124,228 — 124,228 Total $ 125,145 $ (6,018) $ 119,127 (1) Included within other acquired intangibles, net of accumulated amortization on the Company’s Condensed Consolidated Balance Sheets. (2) Included within other non-current liabilities on the Company’s Condensed Consolidated Balance Sheets. During the three and six months ended June 30, 2020, the Company recorded a long-lived asset impairment which reduced the carrying value of acquired mine permits, net, by $8,653 and $14,471. Refer to Note 8. The acquired mine permits are amortized over the estimated life of the associated mine. The coal supply agreement assets and liabilities are amortized over the actual number of tons shipped over the life of each contract. The following table details the amortization of mine permits acquired as a result of the Merger and the amortization of above-market and below-market coal supply agreements: Three Months Ended June 30, Six Months Ended June 30, 2020 2019 2020 2019 Amortization of mine permits (1) $ 3,320 $ 5,664 $ 6,648 $ 11,605 Amortization of above-market coal supply agreements $ 215 $ 122 $ 587 $ 879 Amortization of below-market coal supply agreements (1,439) (6,129) (4,274) (19,510) Net income (1) $ (1,224) $ (6,007) $ (3,687) $ (18,631) (1) Included within amortization of acquired intangibles, net in the Condensed Consolidated Statements of Operations.

Asset Impairment and Restructur

Asset Impairment and Restructuring	6 Months Ended
	Jun. 30, 2020
Restructuring and Related Activities [Abstract]
Asset Impairment and Restructuring	Asset Impairment and Restructuring Strategic Actions During the second quarter of 2020, as a result of the weakening coal market conditions due in part to the impact of the global COVID-19 pandemic, the Company announced that it would take certain strategic actions with respect to two of its thermal coal mining complexes in an effort to strengthen its financial performance and improve forecasted liquidity. The Company announced that an underground mine and preparation plant located in West Virginia would be idled during the third quarter of 2020. In addition, the Company decided not to move forward with the construction of a new refuse impoundment at its Cumberland mine in Pennsylvania and would therefore no longer spend the significant capital required in connection with the project. As a result, the Cumberland mine is expected to cease production at the end of 2022, and in the meantime, the Company plans to actively market the Cumberland property for sale. Long-lived Asset Impairment During the three months ended March 31, 2020, due to declines in metallurgical and thermal coal pricing which reduced forecasted margins at certain locations to amounts below those required for full recoverability, the Company determined that indicators of impairment were present for four long-lived asset groups within its CAPP - Met reporting segment and three long- lived asset groups within its CAPP - Thermal reporting segment and performed impairment testing as of February 29, 2020. At February 29, 2020, the Company determined that the carrying amounts of the asset groups exceeded both their undiscounted cash flows and their estimated fair values. The Company estimated the fair value of these asset groups generally using a discounted cash flow analysis utilizing market-participant assumptions. As a result, after allocating the potential impairment to individual assets, the Company recorded a long-lived asset impairment of $33,709, of which $32,951 was recorded within CAPP - Met and $758 was recorded within CAPP - Thermal. The long-lived asset impairment reduced the carrying values of mineral rights by $21,825, property, plant, and equipment, net, by $6,066, and acquired mine permits, net, by $5,818. In connection with the preparation of the Company’s financial statements for the quarter ended June 30, 2020, the Company determined that the strategic actions taken by the Company during the three months ended June 30, 2020, discussed above, shortened the lives of two mining complexes, and that continued weakening in metallurgical and thermal coal pricing had resulted in forecasted margins at certain locations falling below amounts necessary for full recoverability. As a result of these determinations, the Company assessed that indicators of impairment were present for three long-lived asset groups within its CAPP - Met reporting segment and four long-lived asset groups within its CAPP - Thermal reporting segment. The Company therefore performed impairment testing on these assets and determined that, as of May 31, 2020, the carrying amounts of the asset groups exceeded both their undiscounted cash flows and their estimated fair values. The Company estimated the fair value of these asset groups generally using a discounted cash flow analysis utilizing market-participant assumptions. As a result, after allocating the potential impairment to individual assets, the Company recorded a long-lived asset impairment of $161,738, of which $144,348 was recorded within NAPP, $17,385 was recorded within CAPP - Thermal, and $5 recorded in All Other. No long-lived asset impairment was recorded within the CAPP - Met reporting segment as each of the three long-lived asset groups had previously been impaired. The long-lived asset impairment reduced the carrying values of mineral rights by $18,605, property, plant, and equipment, net, by $134,480, and acquired mine permits, net, by $8,653. During three and six months ended June 30, 2019, the Company recorded $5,826 of asset impairment primarily related to the write-off of prepaid purchased coal from Blackjewel as a result of Blackjewel’s Chapter 11 bankruptcy filing on July 1, 2019. Restructuring As a result of the strategic actions discussed above, the Company recorded restructuring expense during the three and six months ended June 30, 2020 as follows: Affected line item in the Condensed Consolidated Balance Sheets Severance and employee-related benefits (1) $ 20,553 Accrued expenses and other current liabilities and Other non-current liabilities Other costs (2) 1,882 Inventories, net and Other non-current assets Total restructuring expense (3) $ 22,435 (1) Severance and employee-related benefits were considered probable and estimable based on provisions of contractual agreements and existing employee benefit plans. (2) Includes accelerated amortization of deferred longwall move expenses of $668, allowance for advanced mining royalties of $407, and allowance for obsolete materials and supplies inventory of $807. (3) Total restructuring expense of $2,310, $18,132, and $1,993 were recorded within the reportable segments CAPP - Thermal, NAPP and All Other, respectively. There were no restructuring expenses recorded during the three and six months ended June 30, 2019.

Leases

Leases	6 Months Ended
	Jun. 30, 2020
Leases [Abstract]
Leases	LeasesSubsequent to the adoption of ASC 842, the Company recognizes right of use assets and lease liabilities on the balance sheet for all leases with a term longer than 12 months. The discount rates used to determine the present value of the lease assets and liabilities are based on the Company’s incremental borrowing rate at the lease commencement date and commensurate with the remaining lease term. As the rates implicit in most of the Company’s leases are not readily determinable, the Company uses a collateralized incremental borrowing rate based on the information available at the lease commencement date in determining the present value of future payments. The Company uses the portfolio approach and groups leases by short-term and long-term categories, applying the corresponding incremental borrowing rates to these categories of leases. For leases with a term of 12 months or less, no right of use assets or liabilities are recognized on the balance sheet and the Company recognizes the lease expense on a straight-line basis over the lease term. Additionally, the Company recognizes variable lease payments as an expense in the period incurred. The Company’s lease population consists primarily of vehicle and heavy equipment leases and leases for office equipment. The Company’s building and land leases relate to corporate office space and certain site offices. The Company determines whether a contract contains a lease based on whether the Company obtains the right to control the use of specifically identifiable property, plant, and equipment for a period of time in exchange for consideration. For the six months ended June 30, 2020 and 2019, the Company identified no instances requiring significant judgment in determining whether any contracts entered into during the period were or were not leases. Additionally, the Company had no material sublease agreements within the scope of ASC 842 or lease agreements for which the Company was the lessor for the six months ended June 30, 2020 and 2019. Renewal options in the Company’s lease population primarily relate to month-to-month extensions on vehicle leases and are immaterial both individually and in the aggregate. The Company includes renewal options that are reasonably certain to be exercised in the measurement of lease liabilities. As of June 30, 2020, the Company does not intend to exercise any termination options on existing leases. As of June 30, 2020 and December 31, 2019, the Company had the following right-of-use assets and lease liabilities within the Company’s Condensed Consolidated Balance Sheets: June 30, 2020 December 31, 2019 Assets Balance Sheet Classification Financing lease assets Property, plant, and equipment, net $ 6,462 $ 9,718 Operating lease right-of-use assets Other non-current assets 6,857 8,678 Total lease assets $ 13,319 $ 18,396 Liabilities Balance Sheet Classification Financing lease liabilities - current Current portion of long-term debt $ 3,371 $ 3,275 Operating lease liabilities - current Accrued expenses and other current liabilities 1,067 1,813 Financing lease liabilities - long-term Long-term debt 2,969 4,674 Operating lease liabilities - long-term Other non-current liabilities 5,790 6,866 Total lease liabilities $ 13,197 $ 16,628 Total lease costs and other lease information for the three and six months ended June 30, 2020 and 2019 included the following: Three Months Ended June 30, Six Months Ended June 30, 2020 2019 2020 2019 Lease cost (1) Finance lease cost: Amortization of leased assets $ 871 $ 1,013 $ 1,741 $ 1,653 Interest on lease liabilities 92 214 196 258 Operating lease cost 515 191 1,094 1,330 Short-term lease cost 354 541 875 980 Total lease cost $ 1,832 $ 1,959 $ 3,906 $ 4,221 (1) The Company had no variable lease costs or sublease income for the six months ended June 30, 2020 and 2019. Six Months Ended June 30, 2020 2019 Other information Cash paid for amounts included in the measurement of lease liabilities $ 3,783 $ 4,154 Operating cash flows from finance leases $ 200 $ 258 Operating cash flows from operating leases $ 1,969 $ 2,310 Financing cash flows from finance leases $ 1,614 $ 1,586 Right-of-use assets obtained in exchange for new finance lease liabilities $ 46 $ 750 Lease Term and Discount Rate Weighted-average remaining lease term in months - finance leases 25.4 35 Weighted-average remaining lease term in months - operating leases 101 95.9 Weighted-average discount rate - finance leases 5.4 % 4.9 % Weighted-average discount rate - operating leases 11.4 % 10.9 % The Company has elected to show net instead of gross amounts for right-of-use assets and liabilities within its Condensed Consolidated Statements of Cash Flows. The following table summarizes the maturity of the Company’s lease liabilities on an undiscounted cash flow basis and a reconciliation to the lease liabilities recognized in the Company’s Condensed Consolidated Balance Sheet as of June 30, 2020: Finance Leases Operating Leases Lease cost Remainder of 2020 $ 1,815 $ 993 2021 2,985 1,474 2022 1,729 1,355 2023 184 1,119 2024 — 982 Thereafter — 4,915 Total future minimum lease payments $ 6,713 $ 10,838 Imputed interest (373) (3,981) Present value of future minimum lease payments $ 6,340 $ 6,857
Leases	LeasesSubsequent to the adoption of ASC 842, the Company recognizes right of use assets and lease liabilities on the balance sheet for all leases with a term longer than 12 months. The discount rates used to determine the present value of the lease assets and liabilities are based on the Company’s incremental borrowing rate at the lease commencement date and commensurate with the remaining lease term. As the rates implicit in most of the Company’s leases are not readily determinable, the Company uses a collateralized incremental borrowing rate based on the information available at the lease commencement date in determining the present value of future payments. The Company uses the portfolio approach and groups leases by short-term and long-term categories, applying the corresponding incremental borrowing rates to these categories of leases. For leases with a term of 12 months or less, no right of use assets or liabilities are recognized on the balance sheet and the Company recognizes the lease expense on a straight-line basis over the lease term. Additionally, the Company recognizes variable lease payments as an expense in the period incurred. The Company’s lease population consists primarily of vehicle and heavy equipment leases and leases for office equipment. The Company’s building and land leases relate to corporate office space and certain site offices. The Company determines whether a contract contains a lease based on whether the Company obtains the right to control the use of specifically identifiable property, plant, and equipment for a period of time in exchange for consideration. For the six months ended June 30, 2020 and 2019, the Company identified no instances requiring significant judgment in determining whether any contracts entered into during the period were or were not leases. Additionally, the Company had no material sublease agreements within the scope of ASC 842 or lease agreements for which the Company was the lessor for the six months ended June 30, 2020 and 2019. Renewal options in the Company’s lease population primarily relate to month-to-month extensions on vehicle leases and are immaterial both individually and in the aggregate. The Company includes renewal options that are reasonably certain to be exercised in the measurement of lease liabilities. As of June 30, 2020, the Company does not intend to exercise any termination options on existing leases. As of June 30, 2020 and December 31, 2019, the Company had the following right-of-use assets and lease liabilities within the Company’s Condensed Consolidated Balance Sheets: June 30, 2020 December 31, 2019 Assets Balance Sheet Classification Financing lease assets Property, plant, and equipment, net $ 6,462 $ 9,718 Operating lease right-of-use assets Other non-current assets 6,857 8,678 Total lease assets $ 13,319 $ 18,396 Liabilities Balance Sheet Classification Financing lease liabilities - current Current portion of long-term debt $ 3,371 $ 3,275 Operating lease liabilities - current Accrued expenses and other current liabilities 1,067 1,813 Financing lease liabilities - long-term Long-term debt 2,969 4,674 Operating lease liabilities - long-term Other non-current liabilities 5,790 6,866 Total lease liabilities $ 13,197 $ 16,628 Total lease costs and other lease information for the three and six months ended June 30, 2020 and 2019 included the following: Three Months Ended June 30, Six Months Ended June 30, 2020 2019 2020 2019 Lease cost (1) Finance lease cost: Amortization of leased assets $ 871 $ 1,013 $ 1,741 $ 1,653 Interest on lease liabilities 92 214 196 258 Operating lease cost 515 191 1,094 1,330 Short-term lease cost 354 541 875 980 Total lease cost $ 1,832 $ 1,959 $ 3,906 $ 4,221 (1) The Company had no variable lease costs or sublease income for the six months ended June 30, 2020 and 2019. Six Months Ended June 30, 2020 2019 Other information Cash paid for amounts included in the measurement of lease liabilities $ 3,783 $ 4,154 Operating cash flows from finance leases $ 200 $ 258 Operating cash flows from operating leases $ 1,969 $ 2,310 Financing cash flows from finance leases $ 1,614 $ 1,586 Right-of-use assets obtained in exchange for new finance lease liabilities $ 46 $ 750 Lease Term and Discount Rate Weighted-average remaining lease term in months - finance leases 25.4 35 Weighted-average remaining lease term in months - operating leases 101 95.9 Weighted-average discount rate - finance leases 5.4 % 4.9 % Weighted-average discount rate - operating leases 11.4 % 10.9 % The Company has elected to show net instead of gross amounts for right-of-use assets and liabilities within its Condensed Consolidated Statements of Cash Flows. The following table summarizes the maturity of the Company’s lease liabilities on an undiscounted cash flow basis and a reconciliation to the lease liabilities recognized in the Company’s Condensed Consolidated Balance Sheet as of June 30, 2020: Finance Leases Operating Leases Lease cost Remainder of 2020 $ 1,815 $ 993 2021 2,985 1,474 2022 1,729 1,355 2023 184 1,119 2024 — 982 Thereafter — 4,915 Total future minimum lease payments $ 6,713 $ 10,838 Imputed interest (373) (3,981) Present value of future minimum lease payments $ 6,340 $ 6,857

Long-Term Debt

Long-Term Debt	6 Months Ended
	Jun. 30, 2020
Debt Disclosure [Abstract]
Long-Term Debt	Long-Term Debt Long-term debt consisted of the following: June 30, 2020 December 31, 2019 Term Loan Credit Facility - due June 2024 $ 556,182 $ 558,991 ABL Facility - due April 2022 30,750 — LCC Note Payable 45,000 45,000 LCC Water Treatment Obligation 8,750 9,375 Other (1) 11,098 9,295 Debt discount and issuance costs (23,684) (29,695) Total long-term debt 628,096 592,966 Less current portion (30,390) (28,485) Long-term debt, net of current portion $ 597,706 $ 564,481 (1) Includes financing leases, refer to Note 9 for additional information. Term Loan Credit Facility - due June 2024 On June 14, 2019, the Company entered into a Credit Agreement with Cantor Fitzgerald Securities, as administrative agent and collateral agent, and the other lenders party thereto (as defined therein) that provides for a senior secured term loan facility in the aggregate principal amount of $561,800 with a maturity date of June 14, 2024 (the “Term Loan Credit Facility”). Principal repayments equal to approximately $1,405 are due each March, June, September and December (commencing with September 30, 2019) with the final principal repayment installment repaid on the maturity date and in an amount equal to the aggregate principal amount outstanding on such date. The Term Loan Credit Facility bears an interest rate per annum based on the character of the loan (defined as either “Base Rate Loan” or “Eurocurrency Rate Loan”). Each loan type bears interest at a rate per annum comprised of a base rate (as defined) plus an applicable percentage (6.00% for Base Rate Loans and 7.00% for Eurocurrency Rate Loans on or prior to the second anniversary of the Closing Date and 7.00% or 8.00% thereafter (the “Applicable Rate”)). The Eurocurrency base rate is subject to a 2.00% floor. Interest accrued on each Base Rate Loan is payable in arrears on the last business day of each March, June, September and December and the maturity date. Interest accrued on each Eurocurrency Rate Loan is payable in arrears on the last day of each interest period as defined therein. As of June 30, 2020, the borrowings made under the Term Loan Credit Facility were comprised of Eurocurrency Rate Loans with an interest rate of 9.00%, calculated as the Eurocurrency rate during the period plus an applicable rate of 7.00%. As of June 30, 2020, the carrying value of the Term Loan Credit Facility was $539,594, with $5,618 classified as current, within the Condensed Consolidated Balance Sheets. As of December 31, 2019, the carrying value of the term loan credit facility was $538,765, with $5,618 classified as current, within the Condensed Consolidated Balance Sheets. The Company used the proceeds from the Term Loan Credit Facility to repay the outstanding principal balance of $543,125 under the Amended and Restated Credit Agreement dated November 9, 2018 and fees related to such refinancing. The Company recorded a loss on modification of debt of $255, primarily related to modification fees paid under the refinance, and a loss on extinguishment of debt of $26,204, primarily related to the write-off of outstanding debt discounts and unamortized debt issuance costs under the Amended and Restated Credit Agreement dated November 9, 2018, which are recorded in loss on modification and extinguishment of debt within the Condensed Consolidated Statements of Operations for the three and six months ended June 30, 2019. All obligations under the Term Loan Credit Facility are substantially guaranteed by the Company’s existing wholly owned domestic subsidiaries, and are required to be guaranteed by the Company’s future wholly owned domestic subsidiaries. Certain obligations under the Term Loan Facility are secured by a senior lien, subject to certain exceptions (including the ABL Priority Collateral described below), by substantially all of the Company’s assets and the assets of the Company’s subsidiary guarantors (“Term Loan Priority Collateral”), in each case subject to exceptions. The obligations under the Term Loan Credit Facility are also secured by a junior lien, again subject to certain exceptions, against the ABL Priority Collateral. The Term Loan Facility contains negative and affirmative covenants including certain financial covenants that are more flexible than the covenants on the Amended and Restated Credit Agreement dated November 9, 2018. The Company was in compliance with all covenants under this agreement as of June 30, 2020. Amended and Restated Asset-Based Revolving Credit Agreement On November 9, 2018, the Company entered into the Amended and Restated Asset-Based Revolving Credit Agreement which includes a senior secured asset-based revolving credit facility (the “ABL Facility”). Under the ABL Facility, the Company may borrow cash from the Lenders (as defined therein) or cause the L/C Issuers (as defined therein) to issue letters of credit, on a revolving basis, in an aggregate amount of up to $225,000, of which no more than $200,000 may be drawn through letters of credit. Any borrowings under the ABL Facility will have a maturity date of April 3, 2022 and will bear interest based on the character of the loan (defined as either “Base Rate Loan” or “Eurocurrency Rate Loan”) plus an applicable rate ranging from 1.00% to 1.50% for Base Rate Loans and 2.00% to 2.50% for Eurocurrency Rate Loans, depending on the amount of credit available. Pursuant to terms of the Amended and Restated Asset-Based Revolving Credit Agreement at each notice period, the Company elects the character of the loan, the interest period, and may provide notice of continuation or conversion of the borrowed principal amount with the ability to repay the borrowed principal amount in advance of the maturity date without penalty. On March 20, 2020, the Company borrowed $57,500 principal amount under the ABL Facility. The funds were borrowed to augment the Company’s short-term operational flexibility in the face of uncertainty created by the current spread of the COVID-19 virus and its potential effects (see further discussion in Note 1). As of June 30, 2020, the borrowings made under the ABL Facility were comprised of Eurocurrency Rate Loans with an interest rate of 3.46%, calculated as the Eurocurrency rate during the period plus an applicable rate of 2.25%; the borrowings will be subject to a continuation or conversion election of both the applicable rate selection and the interest period determination on September 20, 2020. As of June 30, 2020, the carrying value of the ABL Facility was $30,750 with all amounts classified as non-current within the Condensed Consolidated Balance Sheets based on the maturity date of the ABL Facility. As of December 31, 2019, the Company had no borrowings under the ABL Facility. Any letters of credit issued under the ABL Facility will bear a commitment fee rate ranging from 0.25% to 0.375% depending on the amount of availability per terms of the agreement, and a fronting fee of 0.25% of the face amount under each letter of credit, payable to the ABL Facility’s administrative agent. As of June 30, 2020 and December 31, 2019, the Company had $121,726 and $99,876 letters of credit outstanding under the ABL Facility, respectively. The Amended and Restated Asset-Based Revolving Credit Agreement, as amended, and related documents contain negative and affirmative covenants including certain financial covenants. The Company was in compliance with all covenants under these agreements as of June 30, 2020. LCC Note Payable The Lexington Coal Company (“LCC”) Note Payable has no stated interest rate and an imputed interest rate of 12.45%. The carrying value of the LCC Note Payable was $40,214 and $37,695, with $17,500 and $17,500 reported within the current portion of long-term debt as of June 30, 2020 and December 31, 2019, respectively. LCC Water Treatment Stipulation The LCC Water Treatment Stipulation has no stated interest rate and an imputed interest rate of 13.12%. The carrying value of the LCC Water Treatment Stipulation was $7,073 and $7,211, with $2,500 and $1,875 reported within the current portion of long-term debt as of June 30, 2020 and December 31, 2019, respectively.

Acquisition-Related Obligations

Acquisition-Related Obligations	6 Months Ended
	Jun. 30, 2020
Fair Value Disclosures [Abstract]
Acquisition-Related Obligations	Acquisition-Related ObligationsAcquisition-related obligations consisted of the following: June 30, 2020 December 31, 2019 Contingent Revenue Obligation $ 20,668 $ 52,427 Environmental Settlement Obligations 14,241 16,305 Reclamation Funding Liability 12,000 12,000 UMWA Funds Settlement Liability 4,000 4,000 Discount (2,607) (4,834) Total acquisition-related obligations 48,302 79,898 Less current portion (30,019) (33,639) Acquisition-related obligations, net of current portion $ 18,283 $ 46,259 Contingent Revenue Obligation As of June 30, 2020 and December 31, 2019 the carrying value of the Contingent Revenue Obligation was $20,668 and $52,427, with $9,922 and $14,646 classified as current, respectively, classified as an acquisition-related obligation in the Condensed Consolidated Balance Sheets. Refer to Note 13 for further disclosures related to the fair value assignment and methods used. During the second quarter of 2020, the Company paid $15,084, including $374 of unclaimed unsecured claims distributions, pursuant to terms of the Contingent Revenue Obligation. Environmental Settlement Obligations As of June 30, 2020 and December 31, 2019, the carrying value of the Environmental Settlement Obligations was $12,416 and $13,594, net of discounts of $1,825 and $2,711, with $6,245 and $6,185 classified as current, respectively, all of which was classified as an acquisition-related obligation in the Condensed Consolidated Balance Sheets. Reclamation Funding Agreement As of June 30, 2020 and December 31, 2019, the carrying value of the Funding of Restricted Cash Reclamation liability was $11,852 and $10,808, net of discounts of $148 and $1,192, with $11,852 and $10,808 classified as current, respectively, all of which was classified as an acquisition-related obligation in the Condensed Consolidated Balance Sheets.

Asset Retirement Obligations

Asset Retirement Obligations	6 Months Ended
	Jun. 30, 2020
Asset Retirement Obligation Disclosure [Abstract]
Asset Retirement Obligations	Asset Retirement Obligations The following table summarizes the changes in asset retirement obligations for the six months ended June 30, 2020: Total asset retirement obligations at December 31, 2019 $ 224,704 Accretion for the period 14,679 Sites added during the period 621 Revisions in estimated cash flows (1) 13,244 Expenditures for the period (11,047) Total asset retirement obligations at June 30, 2020 242,201 Less current portion (2) (35,200) Long-term portion $ 207,001 (1) The revisions in estimated cash flows resulted from changes in mine plans primarily associated with the strategic actions impacting certain mines during the three months ended June 30, 2020 of which approximately $3,100 was recorded to depreciation, depletion and amortization. Refer to Note 8.

Fair Value of Financial Instrum

Fair Value of Financial Instruments and Fair Value Measurements	6 Months Ended
	Jun. 30, 2020
Fair Value Disclosures [Abstract]
Fair Value of Financial Instruments and Fair Value Measurements	Fair Value of Financial Instruments and Fair Value Measurements The estimated fair values of financial instruments are determined based on relevant market information. These estimates involve uncertainty and cannot be determined with precision. The carrying amounts for cash and cash equivalents, trade accounts receivable, net, prepaid expenses and other current assets, short-term and long-term restricted cash, short-term and long-term deposits, trade accounts payable, and accrued expenses and other current liabilities approximate fair value as of June 30, 2020 and December 31, 2019 due to the short maturity of these instruments. The following tables set forth by level, within the fair value hierarchy, the Company’s long-term debt at fair value as of June 30, 2020 and December 31, 2019: June 30, 2020 Carrying Amount (1) Total Fair Value Quoted Prices in Active Markets Significant Other Observable Inputs Significant Unobservable Inputs Term Loan Credit Facility - due June 2024 $ 539,594 $ 366,524 $ 366,524 $ — $ — ABL Facility - due April 2022 30,750 27,717 — — 27,717 LCC Note Payable 40,214 34,021 — — 34,021 LCC Water Treatment Obligation 7,073 5,281 — — 5,281 Total long-term debt $ 617,631 $ 433,543 $ 366,524 $ — $ 67,019 December 31, 2019 Carrying Amount (1) Total Fair Value Quoted Prices in Active Markets Significant Other Observable Inputs Significant Unobservable Inputs Term Loan Credit Facility - due June 2024 $ 538,765 $ 461,402 $ 461,402 $ — $ — LCC Note Payable 37,695 33,884 — — 33,884 LCC Water Treatment Obligation 7,211 6,280 — — 6,280 Total long-term debt $ 583,671 $ 501,566 $ 461,402 $ — $ 40,164 (1) Net of debt discounts and debt issuance costs. The following tables set forth by level, within the fair value hierarchy, the Company’s acquisition-related obligations at fair value as of June 30, 2020 and December 31, 2019: June 30, 2020 Carrying Amount (1) Total Fair Value Quoted Prices in Active Markets Significant Other Observable Inputs Significant Unobservable Inputs UMWA Funds Settlement Liability $ 3,367 $ 2,867 $ — $ — $ 2,867 Reclamation Funding Liability 11,852 11,708 — — 11,708 Environmental Settlement Obligations 12,416 10,101 — — 10,101 Total acquisition-related obligations $ 27,635 $ 24,676 $ — $ — $ 24,676 December 31, 2019 Carrying Amount (1) Total Fair Value Quoted Prices in Active Markets Significant Other Observable Inputs Significant Unobservable Inputs UMWA Funds Settlement Liability $ 3,069 $ 2,929 $ — $ — $ 2,929 Reclamation Funding Liability 10,808 10,658 — — 10,658 Environmental Settlement Obligations 13,594 12,197 — — 12,197 Total acquisition-related obligations $ 27,471 $ 25,784 $ — $ — $ 25,784 (1) Net of discounts. The following table sets forth by level, within the fair value hierarchy, the Company’s financial and non-financial assets and liabilities that were accounted for at fair value on a recurring basis as of June 30, 2020 and December 31, 2019. Financial and non-financial assets and liabilities are classified in their entirety based on the lowest level of input that is significant to the fair value measurement. The Company’s assessment of the significance of a particular input to the fair value measurement requires judgment, and may affect the determination of fair value for assets and liabilities and their placement within the fair value hierarchy levels. June 30, 2020 Total Fair Value Quoted Prices in Active Markets (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) Contingent Revenue Obligation $ 20,668 $ — $ — $ 20,668 Trading securities $ 27,413 $ 20,973 $ 6,440 $ — December 31, 2019 Total Fair Value Quoted Prices in Active Markets (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) Contingent Revenue Obligation $ 52,427 $ — $ — $ 52,427 Trading securities $ 13,508 $ 5,506 $ 8,002 $ — The following tables are a reconciliation of the financial and non-financial assets and liabilities that were accounted for at fair value on a recurring basis and that were categorized within Level 3 of the fair value hierarchy: December 31, 2019 Payments Loss (Gain) Recognized in Earnings (1) Transfer In (Out) of Level 3 Fair Value Hierarchy June 30, 2020 Contingent Revenue Obligation $ 52,427 $ (14,710) $ (17,049) $ — $ 20,668 (1) The gain recognized in earnings resulted primarily from a change in the forecasted future revenue associated with this obligation and an increase in annual volatility as of June 30, 2020. December 31, 2018 Payments Measurement Period Adjustments Loss (Gain) Recognized in Earnings Transfer In (Out) of Level 3 Fair Value Hierarchy June 30, 2019 Contingent Revenue Obligation $ 59,880 $ (9,627) 5,738 $ 2,950 $ — $ 58,941 The following methods and assumptions were used to estimate the fair values of the assets and liabilities in the tables above: Level 1 Fair Value Measurements Term Loan Credit Facility - due June 2024 - The fair value is based on observable market data. Trading Securities - Includes money market funds and other cash equivalents. The fair value is based on observable market data. Level 2 Fair Value Measurements Trading Securities - Includes certificates of deposit, mutual funds, corporate debt securities and U.S. treasury and agency securities. The fair values of the Company’s trading securities are obtained from a third-party pricing service provider. The fair values provided by the pricing service provider are based on observable market inputs including credit spreads and broker-dealer quotes, among other inputs. The Company classifies the prices obtained from the pricing services within Level 2 of the fair value hierarchy because the underlying inputs are directly observable from active markets. However, the pricing models used entail a certain amount of subjectivity and therefore differing judgments in how the underlying inputs are modeled could result in different estimates of fair value. Level 3 Fair Value Measurements ABL Facility - due April 2022 - Observable transactions are not available to aid in determining the fair value of this item. Therefore, the fair value was derived by using the expected present value approach in which estimated cash flows are discounted using a risk-free interest rate adjusted for credit risk (discount rate of approximately 10%) as of June 30, 2020. LCC Note Payable, LCC Water Treatment Obligation, UMWA Funds Settlement Liability, Environmental Settlement Obligations and Reclamation Funding Liability - Observable transactions are not available to aid in determining the fair value of these items. Therefore, the fair value was derived by using the expected present value approach in which estimated cash flows are discounted using a risk-free interest rate adjusted for credit risk (discount rates of approximately 35% and 21% as of June 30, 2020 and December 31, 2019, respectively). Contingent Revenue Obligation - The fair value of the contingent revenue obligation was estimated using a Black-Scholes pricing model and is marked to market at each reporting period with changes in value reflected in earnings. The inputs included in the Black-Scholes pricing model are the Company's forecasted future revenue, the stated royalty rate, the remaining periods in the obligation; annual risk-free interest rate based on the U.S. Constant Maturity Treasury Curve and annualized volatility. The annualized volatility was calculated by observing volatilities for comparable companies with adjustments for the Company's size and leverage. The range of significant unobservable inputs used to value the contingent revenue obligation as of June 30, 2020 and December 31, 2019, are set forth in the following table: June 30, 2020 December 31, 2019 Forecasted future revenue $0.83 - $0.84 billion $1.1 - $1.2 billion Stated royalty rate 1.0% - 1.5% 1.0% - 1.5% Annualized volatility 13.9% - 30.4% (25.0%) 9.4% - 28.1% (19.9%)

Income Taxes

Income Taxes	6 Months Ended
	Jun. 30, 2020
Income Tax Disclosure [Abstract]
Income Taxes	Income Taxes For the six months ended June 30, 2020, the Company recorded income tax benefit of $2,155 on a loss from continuing operations before income taxes of $280,264. The income tax benefit differs from the expected statutory amount primarily due to the increase in the valuation allowance, partially offset by the permanent impact of percentage depletion deductions, the impact of state income taxes, net of federal tax impact, and the recording of a discrete tax benefit related to the refundability of previously sequestered AMT Credits. The discrete income tax benefit of the previously sequestered AMT Credits is $2,123 and was recorded during the three months ended March 31, 2020. As of June 30, 2020, the Company anticipates that no current federal income tax liability will be generated in 2020. For the six months ended June 30, 2019, the Company recorded income tax benefit of $5,778 on income from continuing operations before income taxes of $26,512. The income tax expense differs from the expected statutory amount primarily due to the permanent impact of percentage depletion and stock-based compensation deductions and the reduction in the valuation allowance. During the six months ended June 30, 2020, the Company recorded an increase of $74,694 to its deferred tax asset valuation allowance. The increase in the valuation allowance results from an increase in deferred tax assets for which the Company is unable to support realization. The Company currently is relying primarily on the reversal of taxable temporary differences, along with consideration of taxable income via carryback to prior years and tax planning strategies, to support the realization of deferred tax assets. For each reporting period, the Company updates its assessment regarding the realizability of its deferred tax assets, including scheduling the reversal of its deferred tax assets and liabilities, to determine the amount of valuation allowance needed. Scheduling the reversal of deferred tax asset and liability balances requires judgment and estimation. The Company believes the deferred tax liabilities relied upon as future taxable income in its assessment will reverse in the same period and jurisdiction and are of the same character as the temporary differences giving rise to the deferred tax assets that will be realized. The valuation allowance recorded represents the portion of deferred tax assets for which the Company is unable to support realization through the methods described above. On March 27, 2020, the CARES Act was enacted into law. As a result of the CARES Act, the Company expects that AMT Credits of $68,252 will be fully refunded during the year ended December 31, 2020. As of June 30, 2020 and December 31, 2019, the Company classified the current portion of AMT Credit refunds receivable of $67,131 and $33,065, respectively, within prepaid expenses and other current assets on the Company’s Condensed Consolidated Balance Sheets.

Employee Benefit Plans

Employee Benefit Plans	6 Months Ended
	Jun. 30, 2020
Compensation Related Costs [Abstract]
Employee Benefit Plans	Employee Benefit Plans The Company provides several types of benefits for its employees, including defined benefit and defined contribution pension plans, workers’ compensation and black lung benefits, and postemployment life insurance. The Company does not participate in any multiemployer plans. The components of net periodic (benefit) expense other than the service cost component for pension, black lung, and life insurance benefits are included in the line item miscellaneous loss, net in the Condensed Consolidated Statements of Operations. Pension Effective as of the September 30, 2019 adjusted funding target attainment percentage certification date under Section 436 of the Internal Revenue Code, certain lump sum benefit restrictions were lifted for one of the qualified non-contributory defined benefit pension plans, allowing certain eligible participants the option to elect to receive lump sum benefits which resulted in a partial plan settlement and the accelerated recognition of a portion of the accumulated other comprehensive loss during the three and six months ended June 30, 2020. Refer to the table below for further information on the partial plan settlement. The following table details the components of the net periodic benefit for pension obligations: Three Months Ended June 30, Six Months Ended June 30, 2020 2019 2020 2019 Interest cost $ 4,656 $ 6,677 $ 9,391 $ 13,293 Expected return on plan assets (6,748) (7,015) (13,560) (14,021) Amortization of net actuarial loss 521 190 990 398 Settlement 63 — 1,230 — Net periodic benefit $ (1,508) $ (148) $ (1,949) $ (330) Black Lung The following table details the components of the net periodic expense for black lung obligations: Three Months Ended June 30, Six Months Ended June 30, 2020 2019 2020 2019 Service cost $ 585 $ 403 $ 1,164 $ 807 Interest cost 848 909 1,746 1,819 Expected return on plan assets (13) (16) (26) (32) Amortization of net actuarial loss 419 45 750 90 Net periodic expense $ 1,839 $ 1,341 $ 3,634 $ 2,684 As a result of the strategic actions impacting certain mines during the three months ended June 30, 2020 (refer to Note 8), black lung obligations were revalued for curtailment and remeasured with an updated discount rate as of May 31, 2020, which resulted in an increase in the liability for black lung obligations of approximately $7,400 with the offset to accumulated other comprehensive loss and a slight increase in net periodic expense to be recognized subsequent to the remeasurement date. Life Insurance Benefits The following table details the components of the net periodic expense for life insurance benefit obligations: Three Months Ended June 30, Six Months Ended June 30, 2020 2019 2020 2019 Interest cost $ 85 $ 106 $ 169 $ 212 Amortization of net actuarial gain (12) (26) (24) (52) Net periodic expense $ 73 $ 80 $ 145 $ 160 Defined Contribution and Profit Sharing Plans The Company sponsors defined contribution plans to assist its eligible employees in providing for retirement. Generally, under the terms of these plans, employees make voluntary contributions through payroll deductions and the Company makes matching and/or discretionary contributions, as defined by each plan. The Company’s total contributions to these plans for the three months ended June 30, 2020 and 2019 was $643 and $3,767, respectively. The Company’s total contributions to these plans for the six months ended June 30, 2020 and 2019 was $5,892 and $19,303, respectively. During the three months ended June 30, 2020, the Company’s matching contributions under the Contura Energy 401(k) Retirement Savings Plan were suspended due to current market conditions. Self-Insured Medical Plan

Related Party Transactions

Related Party Transactions	6 Months Ended
	Jun. 30, 2020
Related Party Transactions [Abstract]
Related Party Transactions	Related Party Transactions There were no material related party transactions for the six months ended June 30, 2020. On June 14, 2019 the Company entered into a Credit Agreement which provides for the Term Loan Credit Facility as provided by a group of existing shareholders as of the agreement date. Refer to Note 10 for additional disclosures. On July 19, 2019, in association with the Blackjewel Chapter 11 bankruptcy filing, the U.S. Bankruptcy Court approved debtor-in-possession (“DIP”) financing of $2,900 with DIP lenders, Highbridge Capital Management, LLC and Whitebox Advisors LLC, shareholders of the Company. The Company entered into an arrangement on July 19, 2019 to purchase the obligations under the DIP financing at the request of the lenders thereunder pursuant to certain terms and conditions. There were no other material related party transactions for the six months ended June 30, 2019.

Commitments and Contingencies

Commitments and Contingencies	6 Months Ended
	Jun. 30, 2020
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	Commitments and Contingencies (a) General Estimated losses from loss contingencies are accrued by a charge to income when information available indicates that it is probable that an asset has been impaired or a liability has been incurred and the amount of the loss can be reasonably estimated. If a loss contingency is not probable or reasonably estimable, disclosure of the loss contingency is made in the Condensed Consolidated Financial Statements when it is at least reasonably possible that a loss may be incurred and that the loss could be material. (b) Commitments and Contingencies Commitments The Company leases coal mining and other equipment under long-term financing and operating leases with varying terms. Refer to Note 9 for further information on leases. In addition, the Company leases mineral interests and surface rights from land owners under various terms and royalty rates. Coal royalty expense was $16,976 and $27,305 for the three months ended June 30, 2020 and 2019, respectively. Coal royalty expense was $35,916 and $51,251 for the six months ended June 30, 2020 and 2019, respectively. Minimum royalty obligations under coal leases total $5,890, $15,974, $14,081, $13,064, $11,110, and $46,274 for the remainder of 2020, 2021, 2022, 2023, 2024, and after 2024, respectively. Other Commitments The Company has obligations under certain coal purchase agreements that contain minimum quantities to be purchased in the remainder of 2020 totaling an estimated $10,686. The Company has obligations under certain coal transportation agreements that contain minimum quantities to be shipped in 2021 totaling $23,897. The Company also has obligations under certain equipment purchase agreements that contain minimum quantities to be purchased in the remainder of 2020, 2021, 2022, and 2024 totaling $20,489, $12,890, $279, and $1,417, respectively. Contingencies Extensive regulation of the impacts of mining on the environment and of maintaining workplace safety has had, and is expected to continue to have, a significant effect on the Company’s costs of production and results of operations. Further regulations, legislation or litigation in these areas may also cause the Company’s sales or profitability to decline by increasing costs or by hindering the Company’s ability to continue mining at existing operations or to permit new operations. During the normal course of business, contract-related matters arise between the Company and its customers. When a loss related to such matters is considered probable and can reasonably be estimated, the Company records a liability. Future Federal Income Tax Refunds As of June 30, 2020, the Company has recorded $67,131 of federal income tax receivable related to AMT Credits. In addition, the Company has recorded a non-current federal income tax receivable of $64,160 and associated interest receivable of $5,039 related to an NOL carryback claim. Because the federal government was a creditor in the Alpha Natural Resources, Inc. (“Predecessor Alpha”) bankruptcy proceedings, it is possible that the federal government could withhold some or all of the tax refund attributable to the NOL carryback claim and the refundable AMT Credits and assert a right to set off the tax refund, refundable credits, and associated interest receivable against its prepetition bankruptcy claims. (c) Guarantees and Financial Instruments with Off-Balance Sheet Risk In the normal course of business, the Company is a party to certain guarantees and financial instruments with off-balance sheet risk, such as bank letters of credit, performance or surety bonds, and other guarantees and indemnities related to the obligations of affiliated entities which are not reflected in the Company’s Condensed Consolidated Balance Sheets. However, the underlying liabilities that they secure, such as asset retirement obligations, workers’ compensation liabilities, and royalty obligations, are reflected in the Company’s Condensed Consolidated Balance Sheets. The Company is required to provide financial assurance in order to perform the post-mining reclamation required by its mining permits, pay its federal production royalties, pay workers’ compensation claims under workers’ compensation laws in various states, pay federal black lung benefits, and perform certain other obligations. In order to provide the required financial assurance, the Company generally uses surety bonds for post-mining reclamation and workers’ compensation obligations. The Company can also use bank letters of credit to collateralize certain obligations. As of June 30, 2020, the Company had outstanding surety bonds with a total face amount of $395,890 to secure various obligations and commitments. To secure the Company’s reclamation-related obligations, the Company currently has $95,877 of collateral supporting these obligations. The Company meets frequently with its surety providers and has discussions with certain providers regarding the extent of and the terms of their participation in the program. These discussions may cause the Company to shift surety bonds between providers or to alter the terms of their participation in our program. To the extent that surety bonds become unavailable or the Company’s surety bond providers require additional collateral, the Company would seek to secure its obligations with letters of credit, cash deposits or other suitable forms of collateral. The Company’s failure to maintain, or inability to acquire, surety bonds or to provide a suitable alternative would have a material adverse effect on its liquidity. These failures could result from a variety of factors including lack of availability, higher cost or unfavorable market terms of new surety bonds, and the exercise by third-party surety bond issuers of their right to refuse to renew the surety. Amounts included in restricted cash represent cash deposits primarily invested in interest bearing accounts that are restricted as to withdrawal as required by certain agreements entered into by the Company and provide collateral for securing the following obligations which have been written on the Company’s behalf: June 30, 2020 December 31, 2019 Workers' compensation $ 39,135 $ 38,944 Black lung 12,768 12,706 Reclamation-related obligations 55,019 67,868 Financial guarantees and other 3,008 3,006 Contingent revenue obligation escrow 3,720 12,363 Total restricted cash 113,650 134,887 Less current portion (1) (3,720) (12,363) Restricted cash, net of current portion $ 109,930 $ 122,524 (1) Included within prepaid expenses and other current assets on the Company’s Condensed Consolidated Balance Sheets. Amounts included in restricted investments consist of certificates of deposit, mutual funds, and U.S. treasury bills that are restricted as to withdrawal as required by certain agreements entered into by the Company and provide collateral for securing the following obligations which have been written on the Company’s behalf: June 30, 2020 December 31, 2019 Workers' compensation $ 3,131 $ 3,100 Reclamation-related obligations 26,715 18,786 Total restricted investments (1), (2) $ 29,846 $ 21,886 (1) Included within other non-current assets on the Company’s Condensed Consolidated Balance Sheets. (2) As of June 30, 2020 and December 31, 2019, respectively, $27,413 and $13,508 are classified as trading securities and $2,433 and $8,378 are classified as held-to-maturity securities. Deposits represent cash deposits held at third parties as required by certain agreements entered into by the Company to provide cash collateral to secure the following obligations which have been written on the Company’s behalf: June 30, 2020 December 31, 2019 Reclamation-related obligations $ 14,143 $ 8,887 Other operating agreements 1,459 1,836 Total deposits (1) $ 15,602 $ 10,723 (1) Included within prepaid expenses and other current assets and other non-current assets on the Company’s Condensed Consolidated Balance Sheets. Letters of Credit As of June 30, 2020, the Company had $121,726 letters of credit outstanding under the Amended and Restated Asset-Based Revolving Credit Agreement. Additionally, as of June 30, 2020, the Company had $14,242 letters of credit outstanding under the Amended and Restated Letter of Credit Agreement dated November 9, 2018 between ANR, Inc. and Citibank, N.A. and $613 letters of credit outstanding under the Credit and Security Agreement dated June 30, 2017, and related amendments, between ANR, Inc. and First Tennessee Bank National Association. DCMWC Reauthorization Process In July 2019, the U.S. Department of Labor (Division of Coal Mine Workers’ Compensation or “DCMWC”) began implementing a new authorization process for all self-insured coal mine operators. As requested by the DCMWC, the Company filed an application and supporting documentation for reauthorization to self-insure certain of its black lung obligations in October 2019. As a result of this application, the DCMWC notified the Company in a letter dated February 21, 2020 that the Company was reauthorized to self-insure certain of its black lung obligations for a period of one-year from February 21, 2020. The DCMWC reauthorization is contingent, however, upon the Company’s providing collateral of $65,700 to secure certain of its black lung obligations. This proposed collateral requirement is an increase from the approximate $2,600 in collateral that the Company currently provides to secure these self-insured black lung obligations. The reauthorization process provided the Company with the right to appeal the security determination in writing within 30 days of the date of the notification, which appeal period the DCMWC agreed to extend to May 22, 2020. The Company exercised this right of appeal in connection with the substantial increase in the amount of required collateral. If the Company’s appeal is unsuccessful, the Company may be required to provide additional letters of credit to receive the self-insurance reauthorization from the DCMWC or alternatively insure these black lung obligations through a third party provider that would likely also require the Company to provide collateral. Either of these outcomes could potentially reduce the Company’s liquidity. (d) Legal Proceedings The Company is party to legal proceedings from time to time. These proceedings, as well as governmental examinations, could involve various business units and a variety of claims including, but not limited to, contract disputes, personal injury claims, property damage claims (including those resulting from blasting, trucking and flooding), environmental and safety issues, securities-related matters and employment matters. While some legal matters may specify the damages claimed by the plaintiffs, many seek an unquantified amount of damages. Even when the amount of damages claimed against the Company or its subsidiaries is stated, (i) the claimed amount may be exaggerated or unsupported; (ii) the claim may be based on a novel legal theory or involve a large number of parties; (iii) there may be uncertainty as to the likelihood of a class being certified or the ultimate size of the class; (iv) there may be uncertainty as to the outcome of pending appeals or motions; and/or (v) there may be significant factual issues to be resolved. As a result, if such legal matters arise in the future, the Company may be unable to estimate a range of possible loss for matters that have not yet progressed sufficiently through discovery and development of important factual information and legal issues. The Company records accruals based on an estimate of the ultimate outcome of these matters, but these estimates can be difficult to determine and involve significant judgment.

Segment Information

Segment Information	6 Months Ended
	Jun. 30, 2020
Segment Reporting [Abstract]
Segment Information	Segment Information The Company extracts, processes and markets met and thermal coal from surface and deep mines for sale to steel and coke producers, industrial customers, and electric utilities. The Company conducts mining operations only in the United States with mines in Central and Northern Appalachia. As of June 30, 2020, the Company has three reportable segments: CAPP - Met, CAPP - Thermal, and NAPP. CAPP - Met consists of four active mines and two preparation plants in Virginia, eighteen active mines and five preparation plants in West Virginia, as well as expenses associated with certain idled/closed mines. CAPP - Thermal consists of three active mines and two preparation plants in West Virginia, as well as expenses associated with certain idled/closed mines. NAPP consists of one active mine in Pennsylvania and one preparation plant, as well as expenses associated with one closed mine. Prior to the third quarter of 2019, the Company had four reportable segments: CAPP - Met, CAPP - Thermal, NAPP, and Trading and Logistics. As a result of the changes in key operating personnel during the third quarter of 2019 including changes to the Company’s Chief Operating Decision Maker (“CODM”), the Company was required to re-evaluate its previous conclusions with respect to its segment reporting during the period. To conform to the current period reportable segments presentation, the prior periods have been restated to reflect the change in reportable segments. In addition to the three reportable segments, the All Other category includes general corporate overhead and corporate assets and liabilities and the elimination of certain intercompany activity. The operating results of these reportable segments are regularly reviewed by the CODM, who is the Chief Executive Officer of the Company. Segment operating results and capital expenditures for the three months ended June 30, 2020 were as follows: Three Months Ended June 30, 2020 CAPP - Met CAPP - Thermal NAPP All Other Consolidated Total revenues $ 316,534 $ 36,313 $ 57,986 $ 1,005 $ 411,838 Depreciation, depletion, and amortization $ 38,800 $ 7,260 $ 2,172 $ 1,030 $ 49,262 Amortization of acquired intangibles, net $ 2,759 $ (903) $ 215 $ 25 $ 2,096 Adjusted EBITDA $ 17,617 $ 2,492 $ 9,036 $ (12,242) $ 16,903 Capital expenditures $ 27,647 $ 2,504 $ 10,873 $ 507 $ 41,531 Segment operating results and capital expenditures for the three months ended June 30, 2019 were as follows: Three Months Ended June 30, 2019 CAPP - Met CAPP - Thermal NAPP All Other Consolidated Total revenues $ 494,525 $ 82,035 $ 78,928 $ 718 $ 656,206 Depreciation, depletion, and amortization $ 38,829 $ 16,502 $ 6,522 $ 961 $ 62,814 Amortization of acquired intangibles, net $ 3,870 $ (4,213) $ — $ — $ (343) Adjusted EBITDA $ 123,051 $ 11,034 $ 21,298 $ (14,631) $ 140,752 Capital expenditures $ 28,106 $ 5,190 $ 8,204 $ 1,298 $ 42,798 Segment operating results and capital expenditures for the six months ended June 30, 2020 were as follows: Six Months Ended June 30, 2020 CAPP - Met CAPP - Thermal NAPP All Other Consolidated Total revenues $ 679,293 $ 75,581 $ 125,543 $ 1,881 $ 882,298 Depreciation, depletion, and amortization $ 80,522 $ 12,109 $ 9,021 $ 2,075 $ 103,727 Amortization of acquired intangibles, net $ 5,340 $ (2,998) $ 569 $ 50 $ 2,961 Adjusted EBITDA $ 86,821 $ 304 $ 13,395 $ (23,377) $ 77,143 Capital expenditures $ 60,781 $ 5,584 $ 24,169 $ 556 $ 91,090 Segment operating results and capital expenditures for the six months ended June 30, 2019 were as follows: Six Months Ended June 30, 2019 CAPP - Met CAPP - Thermal NAPP All Other Consolidated Total revenues $ 967,328 $ 145,266 $ 151,304 $ 1,422 $ 1,265,320 Depreciation, depletion, and amortization $ 75,502 $ 30,614 $ 13,149 $ 4,820 $ 124,085 Amortization of acquired intangibles, net $ 1,050 $ (8,782) $ 706 $ — $ (7,026) Adjusted EBITDA $ 224,683 $ 6,751 $ 26,052 $ (33,352) $ 224,134 Capital expenditures $ 57,692 $ 7,659 $ 16,203 $ 2,328 $ 83,882 The following table presents a reconciliation of net income (loss) to Adjusted EBITDA for the three months ended June 30, 2020: Three Months Ended June 30, 2020 CAPP - Met CAPP - Thermal NAPP All Other Consolidated Net loss from continuing operations $ (26,987) $ (25,830) $ (156,092) $ (29,392) $ (238,301) Interest expense (376) 2 (504) 19,692 18,814 Interest income (2) — (4) (5,527) (5,533) Income tax expense — — — 33 33 Depreciation, depletion and amortization 38,800 7,260 2,172 1,030 49,262 Non-cash stock compensation expense (94) 1 — 1,137 1,044 Mark-to-market adjustment - acquisition-related obligations — — — (2,052) (2,052) Accretion on asset retirement obligations 3,517 2,267 769 751 7,304 Asset impairment and restructuring (1) — 19,695 162,480 1,998 184,173 Loss on partial settlement of benefit obligations — — — 63 63 Amortization of acquired intangibles, net 2,759 (903) 215 25 2,096 Adjusted EBITDA $ 17,617 $ 2,492 $ 9,036 $ (12,242) $ 16,903 (1) Asset impairment and restructuring for the three months ended June 30, 2020 includes long-lived asset impairments of $161,738 and restructuring expense of $22,435 as a result of continued weakening coal prices and the strategic actions with respect to two thermal coal mining complexes. Refer to Note 8 for further information. The following table presents a reconciliation of net income (loss) to Adjusted EBITDA for the three months ended June 30, 2019: Three Months Ended June 30, 2019 CAPP - Met CAPP - Thermal NAPP All Other Consolidated Net income (loss) from continuing operations $ 70,600 $ (3,932) $ 13,771 $ (56,139) $ 24,300 Interest expense 194 6 — 15,877 16,077 Interest income (4) — (11) (1,870) (1,885) Income tax benefit — — — (1,000) (1,000) Depreciation, depletion and amortization 38,829 16,502 6,522 961 62,814 Merger-related costs — — — 156 156 Non-cash stock compensation expense 376 5 — (927) (546) Mark-to-market adjustment - acquisition-related obligations — — — 1,014 1,014 Accretion on asset retirement obligations 2,327 2,666 1,016 838 6,847 Loss on modification and extinguishment of debt — — — 26,459 26,459 Asset impairment (1) 5,826 — — — 5,826 Cost impact of coal inventory fair value adjustment (2) 1,033 — — — 1,033 Amortization of acquired intangibles, net 3,870 (4,213) — — (343) Adjusted EBITDA $ 123,051 $ 11,034 $ 21,298 $ (14,631) $ 140,752 (1) Asset impairment primarily related to the write-off of prepaid purchased coal from Blackjewel as a result of Blackjewel’s Chapter 11 bankruptcy filing on July 1, 2019. (2) The cost impact of the coal inventory fair value adjustment as a result of the Alpha Merger was completed during the three months ended June 30, 2019. The following table presents a reconciliation of net income (loss) to Adjusted EBITDA for the six months ended June 30, 2020: Six Months Ended June 30, 2020 CAPP - Met CAPP - Thermal NAPP All Other Consolidated Net loss from continuing operations $ (38,451) $ (33,896) $ (159,132) $ (46,630) $ (278,109) Interest expense (1,306) 4 (1,074) 38,795 36,419 Interest income (60) — (14) (6,437) (6,511) Income tax benefit — — — (2,155) (2,155) Depreciation, depletion and amortization 80,522 12,109 9,021 2,075 103,727 Non-cash stock compensation expense 305 8 — 2,809 3,122 Mark-to-market adjustment - acquisition-related obligations — — — (17,049) (17,049) Accretion on asset retirement obligations 7,019 4,619 1,539 1,502 14,679 Asset impairment and restructuring (1) 32,951 20,453 162,480 1,998 217,882 Management restructuring costs (2) 501 5 6 435 947 Loss on partial settlement of benefit obligations — — — 1,230 1,230 Amortization of acquired intangibles, net 5,340 (2,998) 569 50 2,961 Adjusted EBITDA $ 86,821 $ 304 $ 13,395 $ (23,377) $ 77,143 (1) Asset impairment and restructuring for the six months ended June 30, 2020 includes long-lived asset impairments of $195,447 and restructuring expense of $22,435 as a result of continued weakening coal prices and the strategic actions with respect to two thermal coal mining complexes. Refer to Note 8 for further information. (2) Management restructuring costs are related to severance expense associated with senior management changes during the three months ended March 31, 2020. The following table presents a reconciliation of net income (loss) to Adjusted EBITDA for the six months ended June 30, 2019: Six Months Ended June 30, 2019 CAPP - Met CAPP - Thermal NAPP All Other Consolidated Net income (loss) from continuing operations $ 140,984 $ (23,337) $ 10,186 $ (95,543) $ 32,290 Interest expense 222 10 1 30,999 31,232 Interest income (8) — (23) (3,790) (3,821) Income tax benefit — — — (5,778) (5,778) Depreciation, depletion and amortization 75,502 30,614 13,149 4,820 124,085 Merger related costs — — — 987 987 Non-cash stock compensation expense 779 57 — 3,889 4,725 Mark-to-market adjustment - acquisition-related obligations — — — 2,950 2,950 Accretion on asset retirement obligations 4,660 4,731 2,033 1,655 13,079 Loss on modification and extinguishment of debt — — — 26,459 26,459 Asset impairment (1) 5,826 — — — 5,826 Cost impact of coal inventory fair value adjustment (2) 4,751 3,458 — — 8,209 Gain on assets acquired in an exchange transaction (3) (9,083) — — — (9,083) Amortization of acquired intangibles, net 1,050 (8,782) 706 — (7,026) Adjusted EBITDA $ 224,683 $ 6,751 $ 26,052 $ (33,352) $ 224,134 (1) Asset impairment primarily related to the write-off of prepaid purchased coal from Blackjewel as a result of Blackjewel’s Chapter 11 bankruptcy filing on July 1, 2019. (2) The cost impact of the coal inventory fair value adjustment as a result of the Alpha Merger was completed during the three months ended June 30, 2019. (3) During the six months ended June 30, 2019, the Company entered into an exchange transaction which primarily included the release of the PRB overriding royalty interest owed to the Company in exchange for met coal reserves which resulted in a gain of $9,083. No asset information has been provided for these reportable segments as the CODM does not regularly review asset information by reportable segment. The Company markets produced, processed and purchased coal to customers in the United States and in international markets, primarily India, Brazil, Turkey, Netherlands, and Ukraine. Export coal revenues were the following: Three Months Ended June 30, Six Months Ended June 30, 2020 2019 2020 2019 Total coal revenues $ 410,614 $ 653,828 $ 878,981 $ 1,260,788 Export coal revenues (1) $ 252,273 $ 362,838 $ 509,011 $ 706,144 Export coal revenues as % of total coal revenues 61 % 55 % 58 % 56 % (1) The amounts for the three months ended June 30, 2020 include $60,457 and $46,193 of export coal revenues from external customers in India and Brazil, respectively, recorded within the CAPP - Met, CAPP - Thermal, and NAPP segments. The amounts for the three months ended June 30, 2019 include $71,991 of export coal revenues from external customers in India, recorded within the CAPP - Met, CAPP - Thermal, and NAPP segments. The amounts for the six months ended June 30, 2020 include $116,442 and $96,773 of export coal revenues from external customers in India and Brazil, respectively, recorded within the CAPP - Met, CAPP - Thermal, and NAPP segments. The amounts for the six months ended June 30, 2019 include $197,589 of export coal revenues from external customers in India recorded within the CAPP - Met, CAPP - Thermal, and NAPP segments. Revenue is tracked within the Company’s accounting records based on the product destination.

Business and Basis of Present_2

Business and Basis of Presentation (Policies)	6 Months Ended
	Jun. 30, 2020
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Basis of Presentation	Basis of Presentation Together, the condensed consolidated statements of operations, comprehensive loss, balance sheets, cash flows and stockholders’ equity for the Company are referred to as the “Condensed Consolidated Financial Statements.” The Condensed Consolidated Financial Statements are also referenced across periods as “Condensed Consolidated Statements of Operations,” “Condensed Consolidated Statements of Comprehensive Loss,” “Condensed Consolidated Balance Sheets,” “Condensed Consolidated Statements of Cash Flows,” and “Condensed Consolidated Statements of Stockholders’ Equity.” The Condensed Consolidated Financial Statements include all wholly-owned subsidiaries’ results of operations for the three and six months ended June 30, 2020 and 2019. All significant intercompany transactions have been eliminated in consolidation.
Liquidity Risk and Uncertainties	Liquidity Risks and UncertaintiesWeak market conditions and depressed coal prices have resulted in operating losses. If market conditions do not improve, the Company may experience continued operating losses and cash outflows in the coming quarters, which would adversely affect its liquidity. The Company may need to raise additional funds more quickly if market conditions deteriorate, and may not be able to do so in a timely fashion, or at all. The Company believes it will have sufficient liquidity to meet its working capital requirements, anticipated capital expenditures, debt service requirements, acquisition-related obligations, and reclamation obligations for the 12 months subsequent to the issuance of these financial statements. The Company relies on a number of assumptions in budgeting for future activities. These include the costs for mine development to sustain capacity of its operating mines, cash flows from operations, effects of regulation and taxes by governmental agencies, mining technology improvements and reclamation costs. These assumptions are inherently subject to significant business, political, economic, regulatory, environmental and competitive uncertainties, contingencies and risks, all of which are difficult to predict and many of which are beyond the Company’s control. Therefore, the cash on hand and from future operations will be subject to any significant changes in these assumptions.
Recently Adopted Accounting Guidance	Recently Adopted Accounting Guidance Credit Losses: In June 2016, the Financial Accounting Standards Board (the “FASB”) issued Accounting Standards Update (“ASU”) 2016-13, Credit Losses (“ASU 2016-13”). ASU 2016-13 Fair Value Measurement : In August 2018, the FASB issued ASU 2018-13, Fair Value Measurement (Topic 820), Disclosure Framework-Changes to the Disclosure Requirements for Fair Value Measurement (“ASU 2018-13”). The amendments in this update modify the disclosure requirements for fair value measurements. The Company adopted ASU 2018-13 during the first quarter of 2020. The adoption of this ASU did not have a material impact on the Company's Condensed Consolidated Financial Statements and related disclosures. Income Taxes : In December 2019, the FASB issued ASU 2019-12, Income Taxes (Topic 740): Simplifying the Accounting for Income Taxes (“ASU 2019-12”). The amendments in this update simplify the accounting for income taxes by removing certain exceptions to the general principles in Topic 740. The amendments also improve consistent application of and simplify U.S. GAAP for other areas of Topic 740 by clarifying and amending existing guidance. The Company adopted ASU 2019-12 during the first quarter of 2020. The adoption of this ASU did not have a material impact on the Company's Condensed Consolidated Financial Statements and related disclosures. Reference Rate Reform : In March 2020, the FASB issued ASU 2020-04, Reference Rate Reform (Topic 848): Facilitation of Effects of Reference Rate Reform on Financial Reporting (“ASU 2020-04”). The amendments in this update provide optional expedients and exceptions, if certain criteria are met, for applying U.S. GAAP to contracts, hedging relationships, and other transactions that reference LIBOR or another reference rate expected to be discontinued because of reference rate reform. The expedients and exceptions provided by the amendments do not apply to contract modifications made and hedging relationships entered into or evaluated after December 31, 2022, except for hedging relationships existing as of December 31, 2022, that an entity has elected certain optional expedients for and that are retained through the end of the hedging relationship. The Company adopted ASU 2020-04, with respect to topics in Accounting Standards Codification (“ASC”) 310 Receivables , ASC 470 Debt , ASC 815 Derivatives and Hedging and ASC 842 Leases , during the first quarter of 2020. The adoption of this ASU did not have a material impact on the Company's Condensed Consolidated Financial Statements and related disclosures. Recent Accounting Guidance Issued Not Yet Effective Defined Benefit Plans : In August 2018, the FASB issued ASU 2018-14, Compensation—Retirement Benefits—Defined Benefit Plans—General (Subtopic 715-20) Disclosure Framework—Changes to the Disclosure Requirements for Defined Benefit Plans (“ASU 2018-14”). The amendments in this update modify the disclosure requirements for employers that sponsor

Discontinued Operations (Tables

Discontinued Operations (Tables)	6 Months Ended
	Jun. 30, 2020
Discontinued Operations and Disposal Groups [Abstract]
Discontinued Operations	The major components of net loss from discontinued operations in the Condensed Consolidated Statements of Operations for the three and six months ended June 30, 2019 are as follows: Three Months Ended June 30, 2019 Six Months Ended June 30, 2019 Revenues: Total revenues (1) $ 52 $ 148 Costs and expenses: Depreciation, depletion and amortization (2) $ 145,913 $ 145,913 Asset impairment (3) $ 16,468 $ 16,468 Other expenses $ 1,349 $ 2,939 Other non-major expense (income) items, net $ 189 $ 285 (1) Total revenues for the three and six months ended June 30, 2019 consisted entirely of other revenues. (2) The depreciation, depletion and amortization is related to an increase in the Company’s estimate of its asset retirement obligations with respect to the Western Mines as a result of the Blackjewel Chapter 11 bankruptcy filing on July 1, 2019. The Company remeasured its asset retirement obligations based on the expectation that the mining permits would not transfer to Blackjewel and Blackjewel would be unable to perform its contractual obligation to reclaim the properties. The increase in the asset retirement obligation was recorded to expense as the Company no longer owned the underlying mining assets. (3) The asset impairment is primarily related to the write-off of a tax receivable. The Company was considered to be the primary obligor for certain taxes but for which Blackjewel was contractually obligated to pay. During the three months ended June 30, 2019, the Company recorded an impairment charge for the offsetting receivable from Blackjewel as a result of the Blackjewel bankruptcy filing. The major components of cash flows related to discontinued operations are as follows: Three Months Ended June 30, 2019 Six Months Ended June 30, 2019 Other significant operating non-cash items related to discontinued operations: Depreciation, depletion and amortization $ 145,913 $ 145,913

Revenue (Tables)

Revenue (Tables)	6 Months Ended
	Jun. 30, 2020
Revenue from Contract with Customer [Abstract]
Disaggregation of Revenue	The following tables disaggregate the Company’s coal revenues by product category and by market to depict how the nature, amount, timing, and uncertainty of the Company’s coal revenues and cash flows are affected by economic factors: Three Months Ended June 30, 2020 Met Thermal Total Export coal revenues $ 241,905 $ 10,369 $ 252,274 Domestic coal revenues 82,903 75,437 158,340 Total coal revenues $ 324,808 $ 85,806 $ 410,614 Three Months Ended June 30, 2019 Met Thermal Total Export coal revenues $ 345,576 $ 17,262 $ 362,838 Domestic coal revenues 156,053 134,937 290,990 Total coal revenues $ 501,629 $ 152,199 $ 653,828 Six Months Ended June 30, 2020 Met Thermal Total Export coal revenues $ 491,260 $ 17,752 $ 509,012 Domestic coal revenues 197,591 172,378 369,969 Total coal revenues $ 688,851 $ 190,130 $ 878,981 Six Months Ended June 30, 2019 Met Thermal Total Export coal revenues $ 679,762 $ 26,382 $ 706,144 Domestic coal revenues 292,311 262,333 554,644 Total coal revenues $ 972,073 $ 288,715 $ 1,260,788
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction	The following table includes estimated revenue expected to be recognized in the future related to performance obligations that are unsatisfied as of June 30, 2020. Remainder of 2020 2021 2022 2023 2024 2025 Total Estimated coal revenues $ 223,350 $ 259,065 $ 191,278 $ — $ — $ — $ 673,693

Accumulated Other Comprehensi_2

Accumulated Other Comprehensive (Loss) Income (Tables)	6 Months Ended
	Jun. 30, 2020
Equity [Abstract]
Schedule of Accumulated Other Comprehensive Income (Loss)	The following tables summarize the changes to accumulated other comprehensive (loss) income during the six months ended June 30, 2020 and 2019: Balance January 1, 2020 Other comprehensive (loss) income before reclassifications Amounts reclassified from accumulated other comprehensive (loss) income Balance June 30, 2020 Employee benefit costs $ (58,616) $ (14,154) $ 3,023 $ (69,747) Balance January 1, 2019 Other comprehensive (loss) income before reclassifications Amounts reclassified from accumulated other comprehensive (loss) income Balance June 30, 2019 Employee benefit costs $ (23,130) $ 713 $ 341 $ (22,076) The following table summarizes the amounts reclassified from accumulated other comprehensive (loss) income and the Condensed Consolidated Statements of Operations line items affected by the reclassification during the three and six months ended June 30, 2020 and 2019: Details about accumulated other comprehensive (loss) income components Amounts reclassified from accumulated other comprehensive (loss) income Affected line item in the Condensed Consolidated Statements of Operations Three Months Ended June 30, Six Months Ended June 30, 2020 2019 2020 2019 Employee benefit costs: Amortization of actuarial loss (1) $ 934 $ 222 $ 1,728 $ 461 Miscellaneous loss, net Settlement (1) 95 — 1,295 — Miscellaneous loss, net Total before income tax $ 1,029 $ 222 $ 3,023 $ 461 Income tax expense — (58) — (120) Income tax (expense) benefit Total, net of income tax $ 1,029 $ 164 $ 3,023 $ 341 (1) These accumulated other comprehensive (loss) income components are included in the computation of net periodic benefit costs for certain employee benefit plans. Refer to Note 15.

Net (Loss) Income Per Share (Ta

Net (Loss) Income Per Share (Tables)	6 Months Ended
	Jun. 30, 2020
Earnings Per Share [Abstract]
Schedule of Earnings Per Share, Basic and Diluted	The following table presents the net (loss) income per common share for the three and six months ended June 30, 2020 and 2019: Three Months Ended June 30, Six Months Ended June 30, 2020 2019 2020 2019 Net loss (Loss) income from continuing operations $ (238,301) $ 24,300 $ (278,109) $ 32,290 Loss from discontinued operations — (137,961) — (139,136) Net loss $ (238,301) $ (113,661) $ (278,109) $ (106,846) Basic Weighted average common shares outstanding - basic 18,304,853 19,123,705 18,275,382 19,009,643 Basic loss per common share: (Loss) income from continuing operations $ (13.02) $ 1.27 $ (15.22) $ 1.70 Loss from discontinued operations — (7.21) — (7.32) Net loss $ (13.02) $ (5.94) $ (15.22) $ (5.62) Diluted Weighted average common shares outstanding - basic 18,304,853 19,123,705 18,275,382 19,009,643 Diluted effect of warrants — 143,571 — 179,807 Diluted effect of stock options — 74,278 — 139,956 Diluted effect of restricted share units, restricted stock shares and performance-based restricted share units — 78,917 — 150,777 Weighted average common shares outstanding - diluted 18,304,853 19,420,471 18,275,382 19,480,183 Diluted loss per common share: (Loss) income from continuing operations $ (13.02) $ 1.25 $ (15.22) $ 1.66 Loss from discontinued operations — (7.10) — (7.14) Net loss $ (13.02) $ (5.85) $ (15.22) $ (5.48)

Inventories, Net (Tables)

Inventories, Net (Tables)	6 Months Ended
	Jun. 30, 2020
Inventory Disclosure [Abstract]
Schedule of Inventory	Inventories, net consisted of the following: June 30, 2020 December 31, 2019 Raw coal $ 25,962 $ 30,274 Saleable coal 90,572 105,092 Materials, supplies and other, net (1) 26,664 27,293 Total inventories, net $ 143,198 $ 162,659

Acquired Intangibles (Tables)

Acquired Intangibles (Tables)	6 Months Ended
	Jun. 30, 2020
Goodwill and Intangible Assets Disclosure [Abstract]
Schedule of Intangibles	The balances and respective balance sheet classifications of such assets and liabilities as of June 30, 2020 and December 31, 2019, net of accumulated amortization, are set forth in the following tables: June 30, 2020 Assets (1) Liabilities (2) Net Total Coal supply agreements, net $ 330 $ (1,745) $ (1,415) Acquired mine permits, net 103,109 — 103,109 Total $ 103,439 $ (1,745) $ 101,694 December 31, 2019 Assets (1) Liabilities (2) Net Total Coal supply agreements, net $ 917 $ (6,018) $ (5,101) Acquired mine permits, net 124,228 — 124,228 Total $ 125,145 $ (6,018) $ 119,127 (1) Included within other acquired intangibles, net of accumulated amortization on the Company’s Condensed Consolidated Balance Sheets. (2) Included within other non-current liabilities on the Company’s Condensed Consolidated Balance Sheets. Three Months Ended June 30, Six Months Ended June 30, 2020 2019 2020 2019 Amortization of mine permits (1) $ 3,320 $ 5,664 $ 6,648 $ 11,605 Amortization of above-market coal supply agreements $ 215 $ 122 $ 587 $ 879 Amortization of below-market coal supply agreements (1,439) (6,129) (4,274) (19,510) Net income (1) $ (1,224) $ (6,007) $ (3,687) $ (18,631) (1) Included within amortization of acquired intangibles, net in the Condensed Consolidated Statements of Operations.

Asset Impairment and Restruct_2

Asset Impairment and Restructuring (Tables)	6 Months Ended
	Jun. 30, 2020
Restructuring and Related Activities [Abstract]
Restructuring and Related Costs	As a result of the strategic actions discussed above, the Company recorded restructuring expense during the three and six months ended June 30, 2020 as follows: Affected line item in the Condensed Consolidated Balance Sheets Severance and employee-related benefits (1) $ 20,553 Accrued expenses and other current liabilities and Other non-current liabilities Other costs (2) 1,882 Inventories, net and Other non-current assets Total restructuring expense (3) $ 22,435 (1) Severance and employee-related benefits were considered probable and estimable based on provisions of contractual agreements and existing employee benefit plans. (2) Includes accelerated amortization of deferred longwall move expenses of $668, allowance for advanced mining royalties of $407, and allowance for obsolete materials and supplies inventory of $807.

Leases (Tables)

Leases (Tables)	6 Months Ended
	Jun. 30, 2020
Leases [Abstract]
Right-of-use Assets and Lease Liabilities	As of June 30, 2020 and December 31, 2019, the Company had the following right-of-use assets and lease liabilities within the Company’s Condensed Consolidated Balance Sheets: June 30, 2020 December 31, 2019 Assets Balance Sheet Classification Financing lease assets Property, plant, and equipment, net $ 6,462 $ 9,718 Operating lease right-of-use assets Other non-current assets 6,857 8,678 Total lease assets $ 13,319 $ 18,396 Liabilities Balance Sheet Classification Financing lease liabilities - current Current portion of long-term debt $ 3,371 $ 3,275 Operating lease liabilities - current Accrued expenses and other current liabilities 1,067 1,813 Financing lease liabilities - long-term Long-term debt 2,969 4,674 Operating lease liabilities - long-term Other non-current liabilities 5,790 6,866 Total lease liabilities $ 13,197 $ 16,628
Lease Costs and Other Information	Total lease costs and other lease information for the three and six months ended June 30, 2020 and 2019 included the following: Three Months Ended June 30, Six Months Ended June 30, 2020 2019 2020 2019 Lease cost (1) Finance lease cost: Amortization of leased assets $ 871 $ 1,013 $ 1,741 $ 1,653 Interest on lease liabilities 92 214 196 258 Operating lease cost 515 191 1,094 1,330 Short-term lease cost 354 541 875 980 Total lease cost $ 1,832 $ 1,959 $ 3,906 $ 4,221 (1) The Company had no variable lease costs or sublease income for the six months ended June 30, 2020 and 2019. Six Months Ended June 30, 2020 2019 Other information Cash paid for amounts included in the measurement of lease liabilities $ 3,783 $ 4,154 Operating cash flows from finance leases $ 200 $ 258 Operating cash flows from operating leases $ 1,969 $ 2,310 Financing cash flows from finance leases $ 1,614 $ 1,586 Right-of-use assets obtained in exchange for new finance lease liabilities $ 46 $ 750 Lease Term and Discount Rate Weighted-average remaining lease term in months - finance leases 25.4 35 Weighted-average remaining lease term in months - operating leases 101 95.9 Weighted-average discount rate - finance leases 5.4 % 4.9 % Weighted-average discount rate - operating leases 11.4 % 10.9 %
Operating Lease Maturity	The following table summarizes the maturity of the Company’s lease liabilities on an undiscounted cash flow basis and a reconciliation to the lease liabilities recognized in the Company’s Condensed Consolidated Balance Sheet as of June 30, 2020: Finance Leases Operating Leases Lease cost Remainder of 2020 $ 1,815 $ 993 2021 2,985 1,474 2022 1,729 1,355 2023 184 1,119 2024 — 982 Thereafter — 4,915 Total future minimum lease payments $ 6,713 $ 10,838 Imputed interest (373) (3,981) Present value of future minimum lease payments $ 6,340 $ 6,857
Finance Lease Maturity	The following table summarizes the maturity of the Company’s lease liabilities on an undiscounted cash flow basis and a reconciliation to the lease liabilities recognized in the Company’s Condensed Consolidated Balance Sheet as of June 30, 2020: Finance Leases Operating Leases Lease cost Remainder of 2020 $ 1,815 $ 993 2021 2,985 1,474 2022 1,729 1,355 2023 184 1,119 2024 — 982 Thereafter — 4,915 Total future minimum lease payments $ 6,713 $ 10,838 Imputed interest (373) (3,981) Present value of future minimum lease payments $ 6,340 $ 6,857

Long-Term Debt (Tables)

Long-Term Debt (Tables)	6 Months Ended
	Jun. 30, 2020
Debt Disclosure [Abstract]
Schedule of Long-term Debt Instruments	Long-term debt consisted of the following: June 30, 2020 December 31, 2019 Term Loan Credit Facility - due June 2024 $ 556,182 $ 558,991 ABL Facility - due April 2022 30,750 — LCC Note Payable 45,000 45,000 LCC Water Treatment Obligation 8,750 9,375 Other (1) 11,098 9,295 Debt discount and issuance costs (23,684) (29,695) Total long-term debt 628,096 592,966 Less current portion (30,390) (28,485) Long-term debt, net of current portion $ 597,706 $ 564,481 (1) Includes financing leases, refer to Note 9 for additional information.

Acquisition-Related Obligatio_2

Acquisition-Related Obligations (Tables)	6 Months Ended
	Jun. 30, 2020
Fair Value Disclosures [Abstract]
Schedule of Acquisition-Related Obligations	Acquisition-related obligations consisted of the following: June 30, 2020 December 31, 2019 Contingent Revenue Obligation $ 20,668 $ 52,427 Environmental Settlement Obligations 14,241 16,305 Reclamation Funding Liability 12,000 12,000 UMWA Funds Settlement Liability 4,000 4,000 Discount (2,607) (4,834) Total acquisition-related obligations 48,302 79,898 Less current portion (30,019) (33,639) Acquisition-related obligations, net of current portion $ 18,283 $ 46,259

Asset Retirement Obligations (T

Asset Retirement Obligations (Tables)	6 Months Ended
	Jun. 30, 2020
Asset Retirement Obligation Disclosure [Abstract]
Summary of Changes in Asset Retirement Obligations	The following table summarizes the changes in asset retirement obligations for the six months ended June 30, 2020: Total asset retirement obligations at December 31, 2019 $ 224,704 Accretion for the period 14,679 Sites added during the period 621 Revisions in estimated cash flows (1) 13,244 Expenditures for the period (11,047) Total asset retirement obligations at June 30, 2020 242,201 Less current portion (2) (35,200) Long-term portion $ 207,001 (1) The revisions in estimated cash flows resulted from changes in mine plans primarily associated with the strategic actions impacting certain mines during the three months ended June 30, 2020 of which approximately $3,100 was recorded to depreciation, depletion and amortization. Refer to Note 8.

Fair Value of Financial Instr_2

Fair Value of Financial Instruments and Fair Value Measurements (Tables)	6 Months Ended
	Jun. 30, 2020
Fair Value Disclosures [Abstract]
Fair Value Measurements, Nonrecurring	The following tables set forth by level, within the fair value hierarchy, the Company’s long-term debt at fair value as of June 30, 2020 and December 31, 2019: June 30, 2020 Carrying Amount (1) Total Fair Value Quoted Prices in Active Markets Significant Other Observable Inputs Significant Unobservable Inputs Term Loan Credit Facility - due June 2024 $ 539,594 $ 366,524 $ 366,524 $ — $ — ABL Facility - due April 2022 30,750 27,717 — — 27,717 LCC Note Payable 40,214 34,021 — — 34,021 LCC Water Treatment Obligation 7,073 5,281 — — 5,281 Total long-term debt $ 617,631 $ 433,543 $ 366,524 $ — $ 67,019 December 31, 2019 Carrying Amount (1) Total Fair Value Quoted Prices in Active Markets Significant Other Observable Inputs Significant Unobservable Inputs Term Loan Credit Facility - due June 2024 $ 538,765 $ 461,402 $ 461,402 $ — $ — LCC Note Payable 37,695 33,884 — — 33,884 LCC Water Treatment Obligation 7,211 6,280 — — 6,280 Total long-term debt $ 583,671 $ 501,566 $ 461,402 $ — $ 40,164 (1) Net of debt discounts and debt issuance costs. The following tables set forth by level, within the fair value hierarchy, the Company’s acquisition-related obligations at fair value as of June 30, 2020 and December 31, 2019: June 30, 2020 Carrying Amount (1) Total Fair Value Quoted Prices in Active Markets Significant Other Observable Inputs Significant Unobservable Inputs UMWA Funds Settlement Liability $ 3,367 $ 2,867 $ — $ — $ 2,867 Reclamation Funding Liability 11,852 11,708 — — 11,708 Environmental Settlement Obligations 12,416 10,101 — — 10,101 Total acquisition-related obligations $ 27,635 $ 24,676 $ — $ — $ 24,676 December 31, 2019 Carrying Amount (1) Total Fair Value Quoted Prices in Active Markets Significant Other Observable Inputs Significant Unobservable Inputs UMWA Funds Settlement Liability $ 3,069 $ 2,929 $ — $ — $ 2,929 Reclamation Funding Liability 10,808 10,658 — — 10,658 Environmental Settlement Obligations 13,594 12,197 — — 12,197 Total acquisition-related obligations $ 27,471 $ 25,784 $ — $ — $ 25,784 (1) Net of discounts.
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis	The following table sets forth by level, within the fair value hierarchy, the Company’s financial and non-financial assets and liabilities that were accounted for at fair value on a recurring basis as of June 30, 2020 and December 31, 2019. Financial and non-financial assets and liabilities are classified in their entirety based on the lowest level of input that is significant to the fair value measurement. The Company’s assessment of the significance of a particular input to the fair value measurement requires judgment, and may affect the determination of fair value for assets and liabilities and their placement within the fair value hierarchy levels. June 30, 2020 Total Fair Value Quoted Prices in Active Markets (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) Contingent Revenue Obligation $ 20,668 $ — $ — $ 20,668 Trading securities $ 27,413 $ 20,973 $ 6,440 $ — December 31, 2019 Total Fair Value Quoted Prices in Active Markets (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) Contingent Revenue Obligation $ 52,427 $ — $ — $ 52,427 Trading securities $ 13,508 $ 5,506 $ 8,002 $ — The following tables are a reconciliation of the financial and non-financial assets and liabilities that were accounted for at fair value on a recurring basis and that were categorized within Level 3 of the fair value hierarchy: December 31, 2019 Payments Loss (Gain) Recognized in Earnings (1) Transfer In (Out) of Level 3 Fair Value Hierarchy June 30, 2020 Contingent Revenue Obligation $ 52,427 $ (14,710) $ (17,049) $ — $ 20,668 (1) The gain recognized in earnings resulted primarily from a change in the forecasted future revenue associated with this obligation and an increase in annual volatility as of June 30, 2020. December 31, 2018 Payments Measurement Period Adjustments Loss (Gain) Recognized in Earnings Transfer In (Out) of Level 3 Fair Value Hierarchy June 30, 2019 Contingent Revenue Obligation $ 59,880 $ (9,627) 5,738 $ 2,950 $ — $ 58,941 June 30, 2020 December 31, 2019 Forecasted future revenue $0.83 - $0.84 billion $1.1 - $1.2 billion Stated royalty rate 1.0% - 1.5% 1.0% - 1.5% Annualized volatility 13.9% - 30.4% (25.0%) 9.4% - 28.1% (19.9%)

Employee Benefit Plans (Tables)

Employee Benefit Plans (Tables)	6 Months Ended
	Jun. 30, 2020
Compensation Related Costs [Abstract]
Schedule of Net Periodic Benefit Cost	The following table details the components of the net periodic benefit for pension obligations: Three Months Ended June 30, Six Months Ended June 30, 2020 2019 2020 2019 Interest cost $ 4,656 $ 6,677 $ 9,391 $ 13,293 Expected return on plan assets (6,748) (7,015) (13,560) (14,021) Amortization of net actuarial loss 521 190 990 398 Settlement 63 — 1,230 — Net periodic benefit $ (1,508) $ (148) $ (1,949) $ (330) The following table details the components of the net periodic expense for black lung obligations: Three Months Ended June 30, Six Months Ended June 30, 2020 2019 2020 2019 Service cost $ 585 $ 403 $ 1,164 $ 807 Interest cost 848 909 1,746 1,819 Expected return on plan assets (13) (16) (26) (32) Amortization of net actuarial loss 419 45 750 90 Net periodic expense $ 1,839 $ 1,341 $ 3,634 $ 2,684 The following table details the components of the net periodic expense for life insurance benefit obligations: Three Months Ended June 30, Six Months Ended June 30, 2020 2019 2020 2019 Interest cost $ 85 $ 106 $ 169 $ 212 Amortization of net actuarial gain (12) (26) (24) (52) Net periodic expense $ 73 $ 80 $ 145 $ 160

Commitments and Contingencies (

Commitments and Contingencies (Tables)	6 Months Ended
	Jun. 30, 2020
Commitments and Contingencies Disclosure [Abstract]
Schedule of Restricted Cash Deposits	Amounts included in restricted cash represent cash deposits primarily invested in interest bearing accounts that are restricted as to withdrawal as required by certain agreements entered into by the Company and provide collateral for securing the following obligations which have been written on the Company’s behalf: June 30, 2020 December 31, 2019 Workers' compensation $ 39,135 $ 38,944 Black lung 12,768 12,706 Reclamation-related obligations 55,019 67,868 Financial guarantees and other 3,008 3,006 Contingent revenue obligation escrow 3,720 12,363 Total restricted cash 113,650 134,887 Less current portion (1) (3,720) (12,363) Restricted cash, net of current portion $ 109,930 $ 122,524 (1) Included within prepaid expenses and other current assets on the Company’s Condensed Consolidated Balance Sheets.
Schedule of Restricted Investments and Deposit Assets	Amounts included in restricted investments consist of certificates of deposit, mutual funds, and U.S. treasury bills that are restricted as to withdrawal as required by certain agreements entered into by the Company and provide collateral for securing the following obligations which have been written on the Company’s behalf: June 30, 2020 December 31, 2019 Workers' compensation $ 3,131 $ 3,100 Reclamation-related obligations 26,715 18,786 Total restricted investments (1), (2) $ 29,846 $ 21,886 (1) Included within other non-current assets on the Company’s Condensed Consolidated Balance Sheets. (2) As of June 30, 2020 and December 31, 2019, respectively, $27,413 and $13,508 are classified as trading securities and $2,433 and $8,378 are classified as held-to-maturity securities. Deposits represent cash deposits held at third parties as required by certain agreements entered into by the Company to provide cash collateral to secure the following obligations which have been written on the Company’s behalf: June 30, 2020 December 31, 2019 Reclamation-related obligations $ 14,143 $ 8,887 Other operating agreements 1,459 1,836 Total deposits (1) $ 15,602 $ 10,723 (1) Included within prepaid expenses and other current assets and other non-current assets on the Company’s Condensed Consolidated Balance Sheets.

Segment Information (Tables)

Segment Information (Tables)	6 Months Ended
	Jun. 30, 2020
Segment Reporting [Abstract]
Schedule of Segment Operating Results and Capital Expenditures	Segment operating results and capital expenditures for the three months ended June 30, 2020 were as follows: Three Months Ended June 30, 2020 CAPP - Met CAPP - Thermal NAPP All Other Consolidated Total revenues $ 316,534 $ 36,313 $ 57,986 $ 1,005 $ 411,838 Depreciation, depletion, and amortization $ 38,800 $ 7,260 $ 2,172 $ 1,030 $ 49,262 Amortization of acquired intangibles, net $ 2,759 $ (903) $ 215 $ 25 $ 2,096 Adjusted EBITDA $ 17,617 $ 2,492 $ 9,036 $ (12,242) $ 16,903 Capital expenditures $ 27,647 $ 2,504 $ 10,873 $ 507 $ 41,531 Segment operating results and capital expenditures for the three months ended June 30, 2019 were as follows: Three Months Ended June 30, 2019 CAPP - Met CAPP - Thermal NAPP All Other Consolidated Total revenues $ 494,525 $ 82,035 $ 78,928 $ 718 $ 656,206 Depreciation, depletion, and amortization $ 38,829 $ 16,502 $ 6,522 $ 961 $ 62,814 Amortization of acquired intangibles, net $ 3,870 $ (4,213) $ — $ — $ (343) Adjusted EBITDA $ 123,051 $ 11,034 $ 21,298 $ (14,631) $ 140,752 Capital expenditures $ 28,106 $ 5,190 $ 8,204 $ 1,298 $ 42,798 Segment operating results and capital expenditures for the six months ended June 30, 2020 were as follows: Six Months Ended June 30, 2020 CAPP - Met CAPP - Thermal NAPP All Other Consolidated Total revenues $ 679,293 $ 75,581 $ 125,543 $ 1,881 $ 882,298 Depreciation, depletion, and amortization $ 80,522 $ 12,109 $ 9,021 $ 2,075 $ 103,727 Amortization of acquired intangibles, net $ 5,340 $ (2,998) $ 569 $ 50 $ 2,961 Adjusted EBITDA $ 86,821 $ 304 $ 13,395 $ (23,377) $ 77,143 Capital expenditures $ 60,781 $ 5,584 $ 24,169 $ 556 $ 91,090 Segment operating results and capital expenditures for the six months ended June 30, 2019 were as follows: Six Months Ended June 30, 2019 CAPP - Met CAPP - Thermal NAPP All Other Consolidated Total revenues $ 967,328 $ 145,266 $ 151,304 $ 1,422 $ 1,265,320 Depreciation, depletion, and amortization $ 75,502 $ 30,614 $ 13,149 $ 4,820 $ 124,085 Amortization of acquired intangibles, net $ 1,050 $ (8,782) $ 706 $ — $ (7,026) Adjusted EBITDA $ 224,683 $ 6,751 $ 26,052 $ (33,352) $ 224,134 Capital expenditures $ 57,692 $ 7,659 $ 16,203 $ 2,328 $ 83,882 The Company markets produced, processed and purchased coal to customers in the United States and in international markets, primarily India, Brazil, Turkey, Netherlands, and Ukraine. Export coal revenues were the following: Three Months Ended June 30, Six Months Ended June 30, 2020 2019 2020 2019 Total coal revenues $ 410,614 $ 653,828 $ 878,981 $ 1,260,788 Export coal revenues (1) $ 252,273 $ 362,838 $ 509,011 $ 706,144 Export coal revenues as % of total coal revenues 61 % 55 % 58 % 56 % (1) The amounts for the three months ended June 30, 2020 include $60,457 and $46,193 of export coal revenues from external customers in India and Brazil, respectively, recorded within the CAPP - Met, CAPP - Thermal, and NAPP segments. The amounts for the three months ended June 30, 2019 include $71,991 of export coal revenues from external customers in India, recorded within the CAPP - Met, CAPP - Thermal, and NAPP segments. The amounts for the six months ended June 30, 2020 include $116,442 and $96,773 of export coal revenues from external customers in India and Brazil, respectively, recorded within the CAPP - Met, CAPP - Thermal, and NAPP segments. The amounts for the six months ended June 30, 2019 include $197,589 of export coal revenues from external customers in India recorded within the CAPP - Met, CAPP - Thermal, and NAPP segments. Revenue is tracked within the Company’s accounting records based on the product destination.
Reconciliation of Net Income (Loss) to Adjusted EBITDA	The following table presents a reconciliation of net income (loss) to Adjusted EBITDA for the three months ended June 30, 2020: Three Months Ended June 30, 2020 CAPP - Met CAPP - Thermal NAPP All Other Consolidated Net loss from continuing operations $ (26,987) $ (25,830) $ (156,092) $ (29,392) $ (238,301) Interest expense (376) 2 (504) 19,692 18,814 Interest income (2) — (4) (5,527) (5,533) Income tax expense — — — 33 33 Depreciation, depletion and amortization 38,800 7,260 2,172 1,030 49,262 Non-cash stock compensation expense (94) 1 — 1,137 1,044 Mark-to-market adjustment - acquisition-related obligations — — — (2,052) (2,052) Accretion on asset retirement obligations 3,517 2,267 769 751 7,304 Asset impairment and restructuring (1) — 19,695 162,480 1,998 184,173 Loss on partial settlement of benefit obligations — — — 63 63 Amortization of acquired intangibles, net 2,759 (903) 215 25 2,096 Adjusted EBITDA $ 17,617 $ 2,492 $ 9,036 $ (12,242) $ 16,903 (1) Asset impairment and restructuring for the three months ended June 30, 2020 includes long-lived asset impairments of $161,738 and restructuring expense of $22,435 as a result of continued weakening coal prices and the strategic actions with respect to two thermal coal mining complexes. Refer to Note 8 for further information. The following table presents a reconciliation of net income (loss) to Adjusted EBITDA for the three months ended June 30, 2019: Three Months Ended June 30, 2019 CAPP - Met CAPP - Thermal NAPP All Other Consolidated Net income (loss) from continuing operations $ 70,600 $ (3,932) $ 13,771 $ (56,139) $ 24,300 Interest expense 194 6 — 15,877 16,077 Interest income (4) — (11) (1,870) (1,885) Income tax benefit — — — (1,000) (1,000) Depreciation, depletion and amortization 38,829 16,502 6,522 961 62,814 Merger-related costs — — — 156 156 Non-cash stock compensation expense 376 5 — (927) (546) Mark-to-market adjustment - acquisition-related obligations — — — 1,014 1,014 Accretion on asset retirement obligations 2,327 2,666 1,016 838 6,847 Loss on modification and extinguishment of debt — — — 26,459 26,459 Asset impairment (1) 5,826 — — — 5,826 Cost impact of coal inventory fair value adjustment (2) 1,033 — — — 1,033 Amortization of acquired intangibles, net 3,870 (4,213) — — (343) Adjusted EBITDA $ 123,051 $ 11,034 $ 21,298 $ (14,631) $ 140,752 (1) Asset impairment primarily related to the write-off of prepaid purchased coal from Blackjewel as a result of Blackjewel’s Chapter 11 bankruptcy filing on July 1, 2019. (2) The cost impact of the coal inventory fair value adjustment as a result of the Alpha Merger was completed during the three months ended June 30, 2019. The following table presents a reconciliation of net income (loss) to Adjusted EBITDA for the six months ended June 30, 2020: Six Months Ended June 30, 2020 CAPP - Met CAPP - Thermal NAPP All Other Consolidated Net loss from continuing operations $ (38,451) $ (33,896) $ (159,132) $ (46,630) $ (278,109) Interest expense (1,306) 4 (1,074) 38,795 36,419 Interest income (60) — (14) (6,437) (6,511) Income tax benefit — — — (2,155) (2,155) Depreciation, depletion and amortization 80,522 12,109 9,021 2,075 103,727 Non-cash stock compensation expense 305 8 — 2,809 3,122 Mark-to-market adjustment - acquisition-related obligations — — — (17,049) (17,049) Accretion on asset retirement obligations 7,019 4,619 1,539 1,502 14,679 Asset impairment and restructuring (1) 32,951 20,453 162,480 1,998 217,882 Management restructuring costs (2) 501 5 6 435 947 Loss on partial settlement of benefit obligations — — — 1,230 1,230 Amortization of acquired intangibles, net 5,340 (2,998) 569 50 2,961 Adjusted EBITDA $ 86,821 $ 304 $ 13,395 $ (23,377) $ 77,143 (1) Asset impairment and restructuring for the six months ended June 30, 2020 includes long-lived asset impairments of $195,447 and restructuring expense of $22,435 as a result of continued weakening coal prices and the strategic actions with respect to two thermal coal mining complexes. Refer to Note 8 for further information. (2) Management restructuring costs are related to severance expense associated with senior management changes during the three months ended March 31, 2020. The following table presents a reconciliation of net income (loss) to Adjusted EBITDA for the six months ended June 30, 2019: Six Months Ended June 30, 2019 CAPP - Met CAPP - Thermal NAPP All Other Consolidated Net income (loss) from continuing operations $ 140,984 $ (23,337) $ 10,186 $ (95,543) $ 32,290 Interest expense 222 10 1 30,999 31,232 Interest income (8) — (23) (3,790) (3,821) Income tax benefit — — — (5,778) (5,778) Depreciation, depletion and amortization 75,502 30,614 13,149 4,820 124,085 Merger related costs — — — 987 987 Non-cash stock compensation expense 779 57 — 3,889 4,725 Mark-to-market adjustment - acquisition-related obligations — — — 2,950 2,950 Accretion on asset retirement obligations 4,660 4,731 2,033 1,655 13,079 Loss on modification and extinguishment of debt — — — 26,459 26,459 Asset impairment (1) 5,826 — — — 5,826 Cost impact of coal inventory fair value adjustment (2) 4,751 3,458 — — 8,209 Gain on assets acquired in an exchange transaction (3) (9,083) — — — (9,083) Amortization of acquired intangibles, net 1,050 (8,782) 706 — (7,026) Adjusted EBITDA $ 224,683 $ 6,751 $ 26,052 $ (33,352) $ 224,134 (1) Asset impairment primarily related to the write-off of prepaid purchased coal from Blackjewel as a result of Blackjewel’s Chapter 11 bankruptcy filing on July 1, 2019. (2) The cost impact of the coal inventory fair value adjustment as a result of the Alpha Merger was completed during the three months ended June 30, 2019. (3) During the six months ended June 30, 2019, the Company entered into an exchange transaction which primarily included the release of the PRB overriding royalty interest owed to the Company in exchange for met coal reserves which resulted in a gain of $9,083.

Business and Basis of Present_3

Business and Basis of Presentation (Details) - USD ($) $ in Thousands	Apr. 03, 2020	Jan. 01, 2020	Dec. 31, 2019	Jun. 30, 2020	Mar. 31, 2020	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Idled operation term	30 days
Accounting Standards Update [Extensible List]		us-gaap:AccountingStandardsUpdate201613Member	us-gaap:AccountingStandardsUpdate201613Member
Stockholder's equity			$ 696,122	$ 409,415	$ 653,835	$ 967,221	$ 1,080,644	$ 1,071,140
Retained Earnings
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Stockholder's equity			86,810	$ (191,739)	$ 46,562	$ 296,283	$ 409,944	$ 403,129
Cumulative effect
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Stockholder's equity			(440)
Cumulative effect | Retained Earnings
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Stockholder's equity			$ (440)

Discontinued Operations - Narra

Discontinued Operations - Narrative (Details) $ in Thousands	May 29, 2020USD ($)
PRB Transaction | Discontinued Operations
Guarantor Obligations [Line Items]
Consideration	$ 625

Discontinued Operations - Major

Discontinued Operations - Major Components of Net Income (Loss) (Details) - PRB Transaction - Discontinued Operations - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
	Jun. 30, 2019	Jun. 30, 2019
Revenues:
Total revenues	$ 52	$ 148
Costs and expenses:
Depreciation, Depletion and amortization	145,913	145,913
Asset impairment	16,468	16,468
Other expenses	1,349	2,939
Other non-major expense (income) items, net	$ 189	$ 285

Discontinued Operations - Maj_2

Discontinued Operations - Major Components of Cash Flows (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
	Jun. 30, 2019	Jun. 30, 2019
PRB Transaction | Discontinued Operations
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Depreciation, depletion and amortization	$ 145,913	$ 145,913

Revenue - Disaggregation of Rev

Revenue - Disaggregation of Revenue by Segment (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Disaggregation of Revenue [Line Items]
Revenues	$ 410,614	$ 653,828	$ 878,981	$ 1,260,788
Coal
Disaggregation of Revenue [Line Items]
Revenues	410,614	653,828	878,981	1,260,788
Met
Disaggregation of Revenue [Line Items]
Revenues	324,808	501,629	688,851	972,073
Thermal
Disaggregation of Revenue [Line Items]
Revenues	85,806	152,199	190,130	288,715
Export coal revenues
Disaggregation of Revenue [Line Items]
Revenues	252,273	362,838	509,011	706,144
Export coal revenues | Coal
Disaggregation of Revenue [Line Items]
Revenues	252,274	362,838	509,012	706,144
Export coal revenues | Met
Disaggregation of Revenue [Line Items]
Revenues	241,905	345,576	491,260	679,762
Export coal revenues | Thermal
Disaggregation of Revenue [Line Items]
Revenues	10,369	17,262	17,752	26,382
Domestic coal revenues | Coal
Disaggregation of Revenue [Line Items]
Revenues	158,340	290,990	369,969	554,644
Domestic coal revenues | Met
Disaggregation of Revenue [Line Items]
Revenues	82,903	156,053	197,591	292,311
Domestic coal revenues | Thermal
Disaggregation of Revenue [Line Items]
Revenues	$ 75,437	$ 134,937	$ 172,378	$ 262,333

Revenue - Performance Obligatio

Revenue - Performance Obligations (Details) $ in Thousands	Jun. 30, 2020USD ($)
Revenue from Contract with Customer [Abstract]
Estimated coal revenues	$ 673,693
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2020-07-01
Revenue from Contract with Customer [Abstract]
Estimated coal revenues	$ 223,350
Disaggregation of Revenue [Line Items]
Revenue, remaining performance obligation, period	6 months
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2021-01-01
Revenue from Contract with Customer [Abstract]
Estimated coal revenues	$ 259,065
Disaggregation of Revenue [Line Items]
Revenue, remaining performance obligation, period	1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2022-01-01
Revenue from Contract with Customer [Abstract]
Estimated coal revenues	$ 191,278
Disaggregation of Revenue [Line Items]
Revenue, remaining performance obligation, period	1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2023-01-01
Revenue from Contract with Customer [Abstract]
Estimated coal revenues	$ 0
Disaggregation of Revenue [Line Items]
Revenue, remaining performance obligation, period	1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2024-01-01
Revenue from Contract with Customer [Abstract]
Estimated coal revenues	$ 0
Disaggregation of Revenue [Line Items]
Revenue, remaining performance obligation, period	1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2025-01-01
Revenue from Contract with Customer [Abstract]
Estimated coal revenues	$ 0
Disaggregation of Revenue [Line Items]
Revenue, remaining performance obligation, period	1 year

Accumulated Other Comprehensi_3

Accumulated Other Comprehensive (Loss) Income - Changes to Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	$ 696,122	$ 1,071,140
Ending balance	409,415	967,221
Employee benefit costs
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	(58,616)	(23,130)
Other comprehensive (loss) income before reclassifications	(14,154)	713
Amounts reclassified from accumulated other comprehensive (loss) income	3,023	341
Ending balance	$ (69,747)	$ (22,076)

Accumulated Other Comprehensi_4

Accumulated Other Comprehensive (Loss) Income - Summary of Amounts Reclassified (Details) - USD ($) $ in Thousands	3 Months Ended				6 Months Ended
	Jun. 30, 2020	Mar. 31, 2020	Jun. 30, 2019	Mar. 31, 2019	Jun. 30, 2020	Jun. 30, 2019
Employee benefit costs:
Miscellaneous loss, net	$ 188		$ (523)		$ (720)	$ (1,389)
(Loss) income from continuing operations before income taxes	(238,268)		23,300		(280,264)	26,512
Income tax (expense) benefit	(33)		1,000		2,155	5,778
Net loss	(238,301)	$ (39,808)	(113,661)	$ 6,815	(278,109)	(106,846)
Amounts reclassified from accumulated other comprehensive (loss) income | Amortization of actuarial loss
Employee benefit costs:
Miscellaneous loss, net	934		222		1,728	461
Amounts reclassified from accumulated other comprehensive (loss) income | Settlement
Employee benefit costs:
Miscellaneous loss, net	95		0		1,295	0
Amounts reclassified from accumulated other comprehensive (loss) income | Employee benefit costs
Employee benefit costs:
(Loss) income from continuing operations before income taxes	1,029		222		3,023	461
Income tax (expense) benefit	0		(58)		0	(120)
Net loss	$ 1,029		$ 164		$ 3,023	$ 341

Net (Loss) Income Per Share - N

Net (Loss) Income Per Share - Narrative (Details) - shares	3 Months Ended	6 Months Ended
	Jun. 30, 2019	Jun. 30, 2019
Stock option
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities excluded from computation of earnings per share (in shares)	95,162	95,162
Restricted stock units
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities excluded from computation of earnings per share (in shares)	131,707	131,707

Net (Loss) Income Per Share - S

Net (Loss) Income Per Share - Schedule of Net Income (Loss) Per Common Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended				6 Months Ended
	Jun. 30, 2020	Mar. 31, 2020	Jun. 30, 2019	Mar. 31, 2019	Jun. 30, 2020	Jun. 30, 2019
Net loss
(Loss) income from continuing operations	$ (238,301)		$ 24,300		$ (278,109)	$ 32,290
Loss from discontinued operations	0		(137,961)		0	(139,136)
Net loss	$ (238,301)	$ (39,808)	$ (113,661)	$ 6,815	$ (278,109)	$ (106,846)
Basic
Weighted average common shares outstanding - basic (in shares)	18,304,853		19,123,705		18,275,382	19,009,643
Basic loss per common share:
(Loss) income from continuing operations (in dollars per share)	$ (13.02)		$ 1.27		$ (15.22)	$ 1.70
Loss from discontinued operations (in dollars per share)	0		(7.21)		0	(7.32)
Net loss (in dollars per share)	$ (13.02)		$ (5.94)		$ (15.22)	$ (5.62)
Diluted
Weighted average common shares outstanding - basic (in shares)	18,304,853		19,123,705		18,275,382	19,009,643
Diluted effect of warrants (in shares)	0		143,571		0	179,807
Weighted average common shares outstanding - diluted (in shares)	18,304,853		19,420,471		18,275,382	19,480,183
Diluted loss per common share:
(Loss) income from continuing operations (in dollars per share)	$ (13.02)		$ 1.25		$ (15.22)	$ 1.66
Loss from discontinuing operations (in dollars per share)	0		(7.10)		0	(7.14)
Net loss (in dollars per share)	$ (13.02)		$ (5.85)		$ (15.22)	$ (5.48)
Diluted effect of stock options
Diluted
Dilutive effect of share-based payment awards (in shares)	0		74,278		0	139,956
Diluted effect of restricted share units, restricted stock shares and performance-based restricted share units
Diluted
Dilutive effect of share-based payment awards (in shares)	0		78,917		0	150,777

Inventories, Net (Details)

Inventories, Net (Details) - USD ($) $ in Thousands	3 Months Ended
	Jun. 30, 2020	Dec. 31, 2019
Inventory [Line Items]
Total inventories, net	$ 143,198	$ 162,659
Allowance for obsolete materials and supplies inventory	807
Coal
Inventory [Line Items]
Raw coal	25,962	30,274
Saleable coal	90,572	105,092
Material, supplies and other, net
Inventory [Line Items]
Materials, supplies and other, net	$ 26,664	$ 27,293

Acquired Intangibles (Details)

Acquired Intangibles (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Finite-Lived Intangible Assets [Line Items]
Assets	$ 103,439	$ 125,145
Liabilities	(1,745)	(6,018)
Net Total	101,694	119,127
Coal supply agreements, net
Finite-Lived Intangible Assets [Line Items]
Assets	330	917
Acquired mine permits, net
Finite-Lived Intangible Assets [Line Items]
Assets	103,109	124,228
Coal supply agreements, net
Finite-Lived Intangible Assets [Line Items]
Liabilities	(1,745)	(6,018)
Acquired mine permits, net
Finite-Lived Intangible Assets [Line Items]
Liabilities	0	0
Coal supply agreements, net
Finite-Lived Intangible Assets [Line Items]
Net Total	(1,415)	(5,101)
Acquired mine permits, net
Finite-Lived Intangible Assets [Line Items]
Net Total	$ 103,109	$ 124,228

Acquired Intangibles - Narrativ

Acquired Intangibles - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Mar. 31, 2020	Jun. 30, 2020
Finite-Lived Intangible Assets [Line Items]
Asset impairment, change in carrying value		$ 33,709
Acquired mine permits, net
Finite-Lived Intangible Assets [Line Items]
Asset impairment, change in carrying value	$ 8,653		$ 14,471

Acquired Intangibles - Amortiza

Acquired Intangibles - Amortization of Intangible Assets (Liabilities) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Finite-Lived Intangible Assets [Line Items]
Amortization of acquired intangibles, net	$ 2,096	$ (343)	$ 2,961	$ (7,026)
Coal supply agreements, net
Finite-Lived Intangible Assets [Line Items]
Amortization of acquired intangibles, net	(1,224)	(6,007)	(3,687)	(18,631)
Acquired mine permits, net
Finite-Lived Intangible Assets [Line Items]
Amortization of intangible assets	3,320	5,664	6,648	11,605
Coal supply agreements, net
Finite-Lived Intangible Assets [Line Items]
Amortization of intangible assets	215	122	587	879
Coal supply agreements, net
Finite-Lived Intangible Assets [Line Items]
Amortization of intangible liabilities	$ (1,439)	$ (6,129)	$ (4,274)	$ (19,510)

Asset Impairment and Restruct_3

Asset Impairment and Restructuring - Narrative (Details)	3 Months Ended			6 Months Ended
	Jun. 30, 2020USD ($)asset_group	Mar. 31, 2020USD ($)asset_group	Jun. 30, 2019USD ($)	Jun. 30, 2020USD ($)	Jun. 30, 2019USD ($)
Impaired Long-Lived Assets Held and Used [Line Items]
Asset impairment		$ 33,709,000
Restructuring expense	$ 22,435,000		$ 0	$ 22,435,000	$ 0
Strategic Actions with Respect to Two Thermal Coal Mining Complexes
Impaired Long-Lived Assets Held and Used [Line Items]
Asset impairment			$ 5,826,000		$ 5,826,000
Restructuring expense	22,435,000			22,435,000
Operating Segments
Impaired Long-Lived Assets Held and Used [Line Items]
Asset impairment	161,738,000
All Other
Impaired Long-Lived Assets Held and Used [Line Items]
Asset impairment	5,000
All Other | Strategic Actions with Respect to Two Thermal Coal Mining Complexes
Impaired Long-Lived Assets Held and Used [Line Items]
Restructuring expense	$ 1,993,000			1,993,000
CAPP - Met
Impaired Long-Lived Assets Held and Used [Line Items]
Number of assets impaired | asset_group	3	4
CAPP - Met | Operating Segments
Impaired Long-Lived Assets Held and Used [Line Items]
Asset impairment	$ 0	$ 32,951,000
CAPP - Thermal
Impaired Long-Lived Assets Held and Used [Line Items]
Number of assets impaired | asset_group	4	3
CAPP - Thermal | Operating Segments
Impaired Long-Lived Assets Held and Used [Line Items]
Asset impairment	$ 17,385,000	$ 758,000
CAPP - Thermal | Operating Segments | Strategic Actions with Respect to Two Thermal Coal Mining Complexes
Impaired Long-Lived Assets Held and Used [Line Items]
Restructuring expense	2,310,000			2,310,000
NAPP | Operating Segments
Impaired Long-Lived Assets Held and Used [Line Items]
Asset impairment	144,348,000
NAPP | Operating Segments | Strategic Actions with Respect to Two Thermal Coal Mining Complexes
Impaired Long-Lived Assets Held and Used [Line Items]
Restructuring expense	18,132,000			$ 18,132,000
Mineral rights
Impaired Long-Lived Assets Held and Used [Line Items]
Asset impairment	18,605,000	21,825,000
Property, plant and equipment
Impaired Long-Lived Assets Held and Used [Line Items]
Asset impairment	134,480,000	6,066,000
Acquired mine permits, net
Impaired Long-Lived Assets Held and Used [Line Items]
Asset impairment	$ 8,653,000	$ 5,818,000

Asset Impairment and Restruct_4

Asset Impairment and Restructuring - Restructuring Expense (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Restructuring Cost and Reserve [Line Items]
Total restructuring expense	$ 22,435	$ 0	$ 22,435	$ 0
Allowance for obsolete materials and supplies inventory	807
Strategic Actions with Respect to Two Thermal Coal Mining Complexes
Restructuring Cost and Reserve [Line Items]
Severance and employee-related benefits	20,553		20,553
Other costs	1,882		1,882
Total restructuring expense	22,435		22,435
Deferred longwall move expenses	668		668
Allowance for advanced mining royalties	407		407
Allowance for obsolete materials and supplies inventory	807		807
All Other | Strategic Actions with Respect to Two Thermal Coal Mining Complexes
Restructuring Cost and Reserve [Line Items]
Total restructuring expense	1,993		1,993
CAPP - Thermal | Operating Segments | Strategic Actions with Respect to Two Thermal Coal Mining Complexes
Restructuring Cost and Reserve [Line Items]
Total restructuring expense	2,310		2,310
NAPP | Operating Segments | Strategic Actions with Respect to Two Thermal Coal Mining Complexes
Restructuring Cost and Reserve [Line Items]
Total restructuring expense	$ 18,132		$ 18,132

Leases - Right-of-use Assets an

Leases - Right-of-use Assets and Lease Liabilities (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Assets
Financing lease assets	$ 6,462	$ 9,718
Financing lease assets	us-gaap:PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetAfterAccumulatedDepreciationAndAmortization	us-gaap:PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetAfterAccumulatedDepreciationAndAmortization
Operating lease right-of-use assets	$ 6,857	$ 8,678
Operating lease right-of-use assets	us-gaap:OtherAssetsNoncurrent	us-gaap:OtherAssetsNoncurrent
Total lease assets	$ 13,319	$ 18,396
Liabilities
Financing lease liabilities - current	$ 3,371	$ 3,275
Financing lease liabilities - current	us-gaap:LongTermDebtAndCapitalLeaseObligationsCurrent	us-gaap:LongTermDebtAndCapitalLeaseObligationsCurrent
Operating lease liabilities - current	$ 1,067	$ 1,813
Operating lease liabilities - current	us-gaap:AccruedLiabilitiesCurrent	us-gaap:AccruedLiabilitiesCurrent
Financing lease liabilities - long-term	$ 2,969	$ 4,674
Financing lease liabilities - long-term	us-gaap:LongTermDebtAndCapitalLeaseObligations	us-gaap:LongTermDebtAndCapitalLeaseObligations
Operating lease liabilities - long-term	$ 5,790	$ 6,866
Operating lease liabilities - long-term	us-gaap:OtherLiabilitiesNoncurrent	us-gaap:OtherLiabilitiesNoncurrent
Total lease liabilities	$ 13,197	$ 16,628

Leases - Lease Costs and Other

Leases - Lease Costs and Other Information (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019	Dec. 31, 2019
Finance lease cost:
Amortization of leased assets	$ 871,000	$ 1,013,000	$ 1,741,000	$ 1,653,000
Interest on lease liabilities	92,000	214,000	196,000	258,000
Operating lease cost	515,000	191,000	1,094,000	1,330,000
Short-term lease cost	354,000	541,000	875,000	980,000
Total lease cost	$ 1,832,000	$ 1,959,000	3,906,000	4,221,000
Variable lease income			0	0
Sublease income			0
Other information
Cash paid for amounts included in the measurement of lease liabilities			3,783,000	4,154,000
Operating cash flows from finance leases			200,000	258,000
Operating cash flows from operating leases			1,969,000	2,310,000
Financing cash flows from finance leases			1,614,000	1,586,000
Right-of-use assets obtained in exchange for new finance lease liabilities			$ 46,000	$ 750,000
Lease Term and Discount Rate
Weighted-average remaining lease term in months - finance leases	2 years 1 month 13 days		2 years 1 month 13 days		2 years 11 months 1 day
Weighted-average remaining lease term in months - operating leases	8 years 5 months 1 day		8 years 5 months 1 day		7 years 11 months 26 days
Weighted-average discount rate - finance leases	5.40%	4.90%	5.40%	4.90%
Weighted-average discount rate - operating leases	11.40%	10.90%	11.40%	10.90%

Leases - Maturities of Lease Li

Leases - Maturities of Lease Liabilities (Details) $ in Thousands	Jun. 30, 2020USD ($)
Finance Leases
Remainder of 2020	$ 1,815
2021	2,985
2022	1,729
2023	184
2024	0
Thereafter	0
Total future minimum lease payments	6,713
Imputed interest	(373)
Present value of future minimum lease payments	6,340
Operating Leases
Remainder of 2020	993
2021	1,474
2022	1,355
2023	1,119
2024	982
Thereafter	4,915
Total future minimum lease payments	10,838
Imputed interest	(3,981)
Present value of future minimum lease payments	$ 6,857

Long-Term Debt - Schedule of Lo

Long-Term Debt - Schedule of Long-Term Debt (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Debt Instrument [Line Items]
Debt discount and issuance costs	$ (23,684)	$ (29,695)
Total long-term debt	628,096	592,966
Less current portion	(30,390)	(28,485)
Long-term debt, net of current portion	597,706	564,481
Term Loan Credit Facility | Term Loan Credit Facility - due June 2024
Debt Instrument [Line Items]
Long-term debt, gross	556,182	558,991
Line of Credit | ABL Facility - due April 2022
Debt Instrument [Line Items]
Long-term debt, gross	30,750	0
Note Payable | LCC Note Payable
Debt Instrument [Line Items]
Long-term debt, gross	45,000	45,000
Note Payable | LCC Water Treatment Obligation
Debt Instrument [Line Items]
Long-term debt, gross	8,750	9,375
Other
Debt Instrument [Line Items]
Long-term debt, gross	$ 11,098	$ 9,295

Long-Term Debt - Narrative (Det

Long-Term Debt - Narrative (Details) - USD ($)	Jun. 14, 2019	Nov. 09, 2018	Jun. 30, 2020	Mar. 20, 2020	Dec. 31, 2019
Term Loan Credit Facility | Term Loan Credit Facility - due June 2024
Debt Instrument [Line Items]
Aggregate amount of debt	$ 561,800,000
Principal payments due in March, June, September and December	$ 1,405,000
Outstanding borrowings			$ 539,594,000		$ 538,765,000
Current portion of long-term debt			$ 5,618,000		5,618,000
Term Loan Credit Facility | Term Loan Credit Facility - due June 2024 | Eurocurrency
Debt Instrument [Line Items]
Variable interest rate			7.00%
Variable interest rate floor	2.00%
Interest rate at period end			9.00%
Term Loan Credit Facility | Term Loan Credit Facility, due November 2025
Debt Instrument [Line Items]
Loans repaid	$ 543,125,000
Losses on modification of debt	255,000
Loss on extinguishment of debt	$ 26,204,000
Line of Credit | ABL Facility - due April 2022
Debt Instrument [Line Items]
Letters of credit outstanding			$ 121,726,000
Note Payable | LCC Note Payable
Debt Instrument [Line Items]
Outstanding borrowings			40,214,000		37,695,000
Current portion of long-term debt			$ 17,500,000		17,500,000
Stated interest rate			0.00%
Imputed interest rate			12.45%
Note Payable | LCC Water Treatment Obligation
Debt Instrument [Line Items]
Outstanding borrowings			$ 7,073,000		7,211,000
Current portion of long-term debt			$ 2,500,000		1,875,000
Stated interest rate			0.00%
Imputed interest rate			13.12%
Revolving Credit Facility | Line of Credit | ABL Facility - due April 2022
Debt Instrument [Line Items]
Outstanding borrowings			$ 30,750,000	$ 57,500,000	0
Maximum borrowing capacity		$ 225,000,000
Fronting fee rate			0.25%
Letters of credit outstanding			$ 121,726,000		$ 99,876,000
Revolving Credit Facility | Line of Credit | ABL Facility - due April 2022 | Minimum
Debt Instrument [Line Items]
Commitment fee rate			0.25%
Revolving Credit Facility | Line of Credit | ABL Facility - due April 2022 | Maximum
Debt Instrument [Line Items]
Commitment fee rate			0.375%
Revolving Credit Facility | Line of Credit | ABL Facility - due April 2022 | Base Rate
Debt Instrument [Line Items]
Variable interest rate			2.25%
Interest rate at period end			3.46%
Revolving Credit Facility | Line of Credit | ABL Facility - due April 2022 | Base Rate | Minimum
Debt Instrument [Line Items]
Variable interest rate		1.00%
Revolving Credit Facility | Line of Credit | ABL Facility - due April 2022 | Base Rate | Maximum
Debt Instrument [Line Items]
Variable interest rate		1.50%
Revolving Credit Facility | Line of Credit | ABL Facility - due April 2022 | Eurocurrency | Minimum
Debt Instrument [Line Items]
Variable interest rate		2.00%
Revolving Credit Facility | Line of Credit | ABL Facility - due April 2022 | Eurocurrency | Maximum
Debt Instrument [Line Items]
Variable interest rate		2.50%
Letter of Credit | Line of Credit | ABL Facility - due April 2022
Debt Instrument [Line Items]
Maximum borrowing capacity		$ 200,000,000
Interest Rate Period One | Term Loan Credit Facility | Term Loan Credit Facility - due June 2024 | Base Rate
Debt Instrument [Line Items]
Variable interest rate	6.00%
Interest Rate Period One | Term Loan Credit Facility | Term Loan Credit Facility - due June 2024 | Eurocurrency
Debt Instrument [Line Items]
Variable interest rate	7.00%
Interest Rate Period Two | Term Loan Credit Facility | Term Loan Credit Facility - due June 2024 | Eurocurrency | Minimum
Debt Instrument [Line Items]
Variable interest rate	7.00%
Interest Rate Period Two | Term Loan Credit Facility | Term Loan Credit Facility - due June 2024 | Eurocurrency | Maximum
Debt Instrument [Line Items]
Variable interest rate	8.00%

Acquisition-Related Obligatio_3

Acquisition-Related Obligations (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Fair Value, Option, Quantitative Disclosures [Line Items]
Discount	$ (2,607)	$ (4,834)
Total acquisition-related obligations	48,302	79,898
Less current portion	(30,019)	(33,639)
Acquisition-related obligations, net of current portion	18,283	46,259
Contingent Revenue Obligation
Fair Value, Option, Quantitative Disclosures [Line Items]
Total acquisition-related obligations - long-term, gross	20,668	52,427
Total acquisition-related obligations	20,668	52,427
Less current portion	(9,922)	(14,646)
Environmental Settlement Obligations
Fair Value, Option, Quantitative Disclosures [Line Items]
Total acquisition-related obligations - long-term, gross	14,241	16,305
Discount	(1,825)	(2,711)
Total acquisition-related obligations	12,416	13,594
Less current portion	(6,245)	(6,185)
Reclamation Funding Liability
Fair Value, Option, Quantitative Disclosures [Line Items]
Total acquisition-related obligations - long-term, gross	12,000	12,000
Discount	(148)	(1,192)
Total acquisition-related obligations	11,852	10,808
Less current portion	(11,852)	(10,808)
UMWA Funds Settlement Liability
Fair Value, Option, Quantitative Disclosures [Line Items]
Total acquisition-related obligations - long-term, gross	$ 4,000	$ 4,000

Acquisition-Related Obligatio_4

Acquisition-Related Obligations - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended
	Jun. 30, 2020	Dec. 31, 2019
Business Acquisition, Contingent Consideration [Line Items]
Acquisition related obligations	$ 48,302	$ 79,898
Acquisition related obligations, current	30,019	33,639
Discount	2,607	4,834
Contingent Revenue Obligation
Business Acquisition, Contingent Consideration [Line Items]
Acquisition related obligations	20,668	52,427
Acquisition related obligations, current	9,922	14,646
Payments for acquisition-related obligations	15,084
Payments for acquisition-related obligations, unclaimed	374
Environmental Settlement Obligations
Business Acquisition, Contingent Consideration [Line Items]
Acquisition related obligations	12,416	13,594
Acquisition related obligations, current	6,245	6,185
Discount	1,825	2,711
Reclamation Funding Liability
Business Acquisition, Contingent Consideration [Line Items]
Acquisition related obligations	11,852	10,808
Acquisition related obligations, current	11,852	10,808
Discount	$ 148	$ 1,192

Asset Retirement Obligations (D

Asset Retirement Obligations (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
	Jun. 30, 2020	Jun. 30, 2020	Dec. 31, 2019
Asset Retirement Obligation [Line Items]
Revisions in estimated cash flows		$ 13,244
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward]
Total asset retirement obligations at December 31, 2019		224,704
Accretion for the period		14,679
Sites added during the period		621
Revisions in estimated cash flows		13,244
Expenditures for the period		(11,047)
Total asset retirement obligations at June 30, 2020	$ 242,201	$ 224,704	$ 224,704
Less current portion (2)	(35,200)
Long-term portion	207,001		$ 184,130
Depreciation, Depletion And Amortization
Asset Retirement Obligation [Line Items]
Revisions in estimated cash flows	3,100
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward]
Revisions in estimated cash flows	$ 3,100

Fair Value of Financial Instr_3

Fair Value of Financial Instruments and Fair Value Measurements - Summary of Long-Term Debt (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Carrying Amount
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total long term debt	$ 617,631	$ 583,671
Carrying Amount | Term Loan Agreement | Term Loan Credit Facility - due June 2024
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total long term debt	539,594	538,765
Carrying Amount | Line of Credit | ABL Facility - due April 2022
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total long term debt	30,750
Carrying Amount | Note Payable | LCC Note Payable
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total long term debt	40,214	37,695
Carrying Amount | Note Payable | LCC Water Treatment Obligation
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total long term debt	7,073	7,211
Fair Value, Measurements, Nonrecurring | Total Fair Value
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total long term debt	433,543	501,566
Fair Value, Measurements, Nonrecurring | Total Fair Value | Quoted Prices in Active Markets (Level 1)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total long term debt	366,524	461,402
Fair Value, Measurements, Nonrecurring | Total Fair Value | Significant Other Observable Inputs (Level 2)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total long term debt	0	0
Fair Value, Measurements, Nonrecurring | Total Fair Value | Significant Unobservable Inputs (Level 3)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total long term debt	67,019	40,164
Fair Value, Measurements, Nonrecurring | Total Fair Value | Term Loan Agreement | Term Loan Credit Facility - due June 2024
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total long term debt	366,524	461,402
Fair Value, Measurements, Nonrecurring | Total Fair Value | Term Loan Agreement | Term Loan Credit Facility - due June 2024 | Quoted Prices in Active Markets (Level 1)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total long term debt	366,524	461,402
Fair Value, Measurements, Nonrecurring | Total Fair Value | Term Loan Agreement | Term Loan Credit Facility - due June 2024 | Significant Other Observable Inputs (Level 2)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total long term debt	0	0
Fair Value, Measurements, Nonrecurring | Total Fair Value | Term Loan Agreement | Term Loan Credit Facility - due June 2024 | Significant Unobservable Inputs (Level 3)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total long term debt	0	0
Fair Value, Measurements, Nonrecurring | Total Fair Value | Line of Credit | ABL Facility - due April 2022
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total long term debt	27,717
Fair Value, Measurements, Nonrecurring | Total Fair Value | Line of Credit | ABL Facility - due April 2022 | Quoted Prices in Active Markets (Level 1)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total long term debt	0
Fair Value, Measurements, Nonrecurring | Total Fair Value | Line of Credit | ABL Facility - due April 2022 | Significant Other Observable Inputs (Level 2)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total long term debt	0
Fair Value, Measurements, Nonrecurring | Total Fair Value | Line of Credit | ABL Facility - due April 2022 | Significant Unobservable Inputs (Level 3)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total long term debt	27,717
Fair Value, Measurements, Nonrecurring | Total Fair Value | Note Payable | LCC Note Payable
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total long term debt	34,021	33,884
Fair Value, Measurements, Nonrecurring | Total Fair Value | Note Payable | LCC Note Payable | Quoted Prices in Active Markets (Level 1)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total long term debt	0	0
Fair Value, Measurements, Nonrecurring | Total Fair Value | Note Payable | LCC Note Payable | Significant Other Observable Inputs (Level 2)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total long term debt	0	0
Fair Value, Measurements, Nonrecurring | Total Fair Value | Note Payable | LCC Note Payable | Significant Unobservable Inputs (Level 3)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total long term debt	34,021	33,884
Fair Value, Measurements, Nonrecurring | Total Fair Value | Note Payable | LCC Water Treatment Obligation
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total long term debt	5,281	6,280
Fair Value, Measurements, Nonrecurring | Total Fair Value | Note Payable | LCC Water Treatment Obligation | Quoted Prices in Active Markets (Level 1)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total long term debt	0	0
Fair Value, Measurements, Nonrecurring | Total Fair Value | Note Payable | LCC Water Treatment Obligation | Significant Other Observable Inputs (Level 2)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total long term debt	0	0
Fair Value, Measurements, Nonrecurring | Total Fair Value | Note Payable | LCC Water Treatment Obligation | Significant Unobservable Inputs (Level 3)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total long term debt	$ 5,281	$ 6,280

Fair Value of Financial Instr_4

Fair Value of Financial Instruments and Fair Value Measurements - Acquisition-related Obligations at Fair Value (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Carrying Amount
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total Fair Value	$ 27,635	$ 27,471
Carrying Amount | UMWA Funds Settlement Liability
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total Fair Value	3,367	3,069
Carrying Amount | Reclamation Funding Liability
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total Fair Value	11,852	10,808
Carrying Amount | Environmental Settlement Obligations
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total Fair Value	12,416	13,594
Fair Value, Measurements, Nonrecurring | Total Fair Value
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total Fair Value	24,676	25,784
Fair Value, Measurements, Nonrecurring | Total Fair Value | Quoted Prices in Active Markets (Level 1)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total Fair Value	0	0
Fair Value, Measurements, Nonrecurring | Total Fair Value | Significant Other Observable Inputs (Level 2)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total Fair Value	0	0
Fair Value, Measurements, Nonrecurring | Total Fair Value | Significant Unobservable Inputs (Level 3)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total Fair Value	24,676	25,784
Fair Value, Measurements, Nonrecurring | Total Fair Value | UMWA Funds Settlement Liability
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total Fair Value	2,867	2,929
Fair Value, Measurements, Nonrecurring | Total Fair Value | UMWA Funds Settlement Liability | Quoted Prices in Active Markets (Level 1)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total Fair Value	0	0
Fair Value, Measurements, Nonrecurring | Total Fair Value | UMWA Funds Settlement Liability | Significant Other Observable Inputs (Level 2)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total Fair Value	0	0
Fair Value, Measurements, Nonrecurring | Total Fair Value | UMWA Funds Settlement Liability | Significant Unobservable Inputs (Level 3)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total Fair Value	2,867	2,929
Fair Value, Measurements, Nonrecurring | Total Fair Value | Reclamation Funding Liability
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total Fair Value	11,708	10,658
Fair Value, Measurements, Nonrecurring | Total Fair Value | Reclamation Funding Liability | Quoted Prices in Active Markets (Level 1)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total Fair Value	0	0
Fair Value, Measurements, Nonrecurring | Total Fair Value | Reclamation Funding Liability | Significant Other Observable Inputs (Level 2)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total Fair Value	0	0
Fair Value, Measurements, Nonrecurring | Total Fair Value | Reclamation Funding Liability | Significant Unobservable Inputs (Level 3)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total Fair Value	11,708	10,658
Fair Value, Measurements, Nonrecurring | Total Fair Value | Environmental Settlement Obligations
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total Fair Value	10,101	12,197
Fair Value, Measurements, Nonrecurring | Total Fair Value | Environmental Settlement Obligations | Quoted Prices in Active Markets (Level 1)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total Fair Value	0	0
Fair Value, Measurements, Nonrecurring | Total Fair Value | Environmental Settlement Obligations | Significant Other Observable Inputs (Level 2)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total Fair Value	0	0
Fair Value, Measurements, Nonrecurring | Total Fair Value | Environmental Settlement Obligations | Significant Unobservable Inputs (Level 3)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total Fair Value	$ 10,101	$ 12,197

Fair Value of Financial Instr_5

Fair Value of Financial Instruments and Fair Value Measurements - Schedule of Fair Value on Recurring Basis (Details) - Fair Value, Measurements, Recurring - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Contingent Revenue Obligation	$ 20,668	$ 52,427
Trading securities	27,413	13,508
Quoted Prices in Active Markets (Level 1)
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Contingent Revenue Obligation	0	0
Trading securities	20,973	5,506
Significant Other Observable Inputs (Level 2)
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Contingent Revenue Obligation	0	0
Trading securities	6,440	8,002
Significant Unobservable Inputs (Level 3)
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Contingent Revenue Obligation	20,668	52,427
Trading securities	$ 0	$ 0

Fair Value of Financial Instr_6

Fair Value of Financial Instruments and Fair Value Measurements - Level 3 of the Fair Value Hierarchy (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Measurement Period Adjustments		$ 5,738
Significant Unobservable Inputs (Level 3)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Beginning balance	$ 52,427	59,880
Payments	(14,710)	(9,627)
Loss (Gain) Recognized in Earnings	(17,049)	2,950
Transfer In (Out) of Level 3 Fair Value Hierarchy	0	0
Ending balance	$ 20,668	$ 58,941

Fair Value of Financial Instr_7

Fair Value of Financial Instruments and Fair Value Measurements - Level 3 Fair Value Measurements (Details) $ in Millions	Jun. 30, 2020USD ($)	Dec. 31, 2019USD ($)
Black Scholes | Forecasted future revenue | Minimum | Contingent Revenue Obligation
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Acquisition-related obligation, measurement input	830	1,100
Black Scholes | Forecasted future revenue | Maximum | Contingent Revenue Obligation
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Acquisition-related obligation, measurement input	840	1,200
Black Scholes | Stated royalty rate | Minimum | Contingent Revenue Obligation
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Acquisition-related obligation, measurement input	0.010	0.010
Black Scholes | Stated royalty rate | Maximum | Contingent Revenue Obligation
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Acquisition-related obligation, measurement input	0.015	0.015
Black Scholes | Annualized volatility | Minimum | Contingent Revenue Obligation
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Acquisition-related obligation, measurement input	0.139	0.094
Black Scholes | Annualized volatility | Maximum | Contingent Revenue Obligation
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Acquisition-related obligation, measurement input	0.304	0.281
Black Scholes | Annualized volatility | Weighted Average | Contingent Revenue Obligation
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Acquisition-related obligation, measurement input	0.250	0.199
Fair Value, Measurements, Recurring | Discounted cash flow | Significant Unobservable Inputs (Level 3) | Discount rate | Notes Payable, UMWA Funds Settlement Liability, Enviromental Settlement Obligations, and Reclaimation Funding Liability,
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Debt and acquisition-related obligation, measurement input	0.35	0.21
Line of Credit | Fair Value, Measurements, Recurring | Discounted cash flow | ABL Facility - due April 2022 | Significant Unobservable Inputs (Level 3) | Discount rate
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Debt, measurement input	0.10

Income Taxes (Details)

Income Taxes (Details) - USD ($) $ in Thousands	3 Months Ended			6 Months Ended
	Jun. 30, 2020	Mar. 31, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019	Dec. 31, 2019
Income Tax [Line Items]
Income tax (expense) benefit	$ (33)		$ 1,000	$ 2,155	$ 5,778
Income (loss) from continuing operations before income taxes	(238,268)		$ 23,300	(280,264)	$ 26,512
Discrete income tax benefit from AMT credit		$ 2,123
Increase (decrease) in deferred tax asset valuation allowance				74,694
AMT credit to be refunded during year	68,252			68,252
Prepaid Expenses and Other Current Assets
Income Tax [Line Items]
AMT credit	$ 67,131			$ 67,131		$ 33,065

Employee Benefit Plans - Schedu

Employee Benefit Plans - Schedule of Components of Net Periodic Benefit Cost (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Pension
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Interest cost	$ 4,656	$ 6,677	$ 9,391	$ 13,293
Expected return on plan assets	(6,748)	(7,015)	(13,560)	(14,021)
Amortization of net actuarial loss (gain)	521	190	990	398
Settlement	63	0	1,230	0
Net periodic expense	(1,508)	(148)	(1,949)	(330)
Black Lung
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Service cost	585	403	1,164	807
Interest cost	848	909	1,746	1,819
Expected return on plan assets	(13)	(16)	(26)	(32)
Amortization of net actuarial loss (gain)	419	45	750	90
Net periodic expense	1,839	1,341	3,634	2,684
Life Insurance Benefits
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Interest cost	85	106	169	212
Amortization of net actuarial loss (gain)	(12)	(26)	(24)	(52)
Net periodic expense	$ 73	$ 80	$ 145	$ 160

Employee Benefit Plans (Details

Employee Benefit Plans (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Compensation Related Costs [Abstract]
Contributions to defined contribution and profit sharing plans	$ 643	$ 3,767	$ 5,892	$ 19,303
Expense for self-insured medical plan	14,211	$ 18,859	$ 31,103	$ 37,897
Black Lung
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Increase in obligations for curtailment	$ 7,400

Related Party Transactions - Na

Related Party Transactions - Narrative (Details) $ in Thousands	Jul. 19, 2019USD ($)
Affiliated Entity | DIP Financing with Shareholders
Related Party Transaction [Line Items]
Allocated expenses	$ 2,900

Commitments and Contingencies_2

Commitments and Contingencies (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019	Feb. 21, 2020	Feb. 20, 2020
Long-term Purchase Commitment [Line Items]
Coal royalty expense	$ 16,976	$ 27,305	$ 35,916	$ 51,251
Income tax receivable	67,131		67,131
Income tax receivable related to NOL carryback claim	64,160		64,160
Income tax receivable related to NOL carryback claim, interest receivable	5,039		5,039
Black Lung
Long-term Purchase Commitment [Line Items]
Collateral for self insurance black lunch obligations					$ 65,700	$ 2,600
Term Loan Credit Facility - due November 2025 | Line of Credit
Long-term Purchase Commitment [Line Items]
Letters of credit outstanding	121,726		121,726
ANR, Inc. and Citibank, N.A. Credit Agreement | Line of Credit
Long-term Purchase Commitment [Line Items]
Letters of credit outstanding	14,242		14,242
Credit and Security Agreement | Line of Credit
Long-term Purchase Commitment [Line Items]
Letters of credit outstanding	613		613
Coal Purchase Agreements
Long-term Purchase Commitment [Line Items]
Minimum quantities to be purchased, 2020	10,686		10,686
Equipment Purchase Agreements
Long-term Purchase Commitment [Line Items]
Minimum quantities to be purchased, 2020	20,489		20,489
Minimum quantities to be purchased, 2021	12,890		12,890
Minimum quantities to be purchased, 2022	279		279
Minimum quantities to be purchased, 2024	1,417		1,417
Shipping
Long-term Purchase Commitment [Line Items]
Minimum royalty obligations, 2022	23,897		23,897
Reclamation-related obligations
Long-term Purchase Commitment [Line Items]
Guarantees	395,890		395,890
Collateral supporting guarantees	95,877		95,877
Royalty Agreements | Coal
Long-term Purchase Commitment [Line Items]
Minimum royalty obligations, 2020	5,890		5,890
Minimum royalty obligations, 2021	15,974		15,974
Minimum royalty obligations, 2022	14,081		14,081
Minimum royalty obligations, 2023	13,064		13,064
Minimum royalty obligations, 2024	11,110		11,110
Minimum royalty obligations, to be paid after 2024	$ 46,274		$ 46,274

Commitments and Contingencies -

Commitments and Contingencies - Schedule of Restricted Cash Deposits (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019	Jun. 30, 2019
Long-term Purchase Commitment [Line Items]
Total restricted cash	$ 113,650	$ 134,887
Less current portion	(3,720)	(12,363)	$ (34,309)
Long-term restricted cash	109,930	122,524	$ 216,568
Workers' compensation
Long-term Purchase Commitment [Line Items]
Total restricted cash	39,135	38,944
Black lung
Long-term Purchase Commitment [Line Items]
Total restricted cash	12,768	12,706
Reclamation-related obligations
Long-term Purchase Commitment [Line Items]
Total restricted cash	55,019	67,868
Financial guarantees and other
Long-term Purchase Commitment [Line Items]
Total restricted cash	3,008	3,006
Contingent revenue obligation escrow
Long-term Purchase Commitment [Line Items]
Total restricted cash	$ 3,720	$ 12,363

Commitments and Contingencies_3

Commitments and Contingencies - Schedule of Restricted Investments (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Long-term Purchase Commitment [Line Items]
Total restricted investments	$ 29,846	$ 21,886
Restricted investments, trading	27,413	13,508
Restricted investments, held-to-maturity	2,433	8,378
Workers' compensation
Long-term Purchase Commitment [Line Items]
Total restricted investments	3,131	3,100
Reclamation-related obligations
Long-term Purchase Commitment [Line Items]
Total restricted investments	$ 26,715	$ 18,786

Commitments and Contingencies_4

Commitments and Contingencies - Cash Deposits Held by Third Parties (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Long-term Purchase Commitment [Line Items]
Total deposits	$ 15,602	$ 10,723
Reclamation-related obligations
Long-term Purchase Commitment [Line Items]
Total deposits	14,143	8,887
Other operating agreements
Long-term Purchase Commitment [Line Items]
Total deposits	$ 1,459	$ 1,836

Segment Information - Schedule

Segment Information - Schedule of Operating Results and Capital Expenditures (Details) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020USD ($)	Jun. 30, 2019USD ($)	Jun. 30, 2020USD ($)mineplantsegment	Jun. 30, 2019USD ($)segment
Segment Reporting Information [Line Items]
Number of reportable segments | segment			3	4
Total revenues	$ 411,838	$ 656,206	$ 882,298	$ 1,265,320
Depreciation, depletion and amortization	49,262	62,814	103,727	124,085
Amortization of acquired intangibles, net	2,096	(343)	2,961	(7,026)
Adjusted EBITDA	16,903	140,752	77,143	224,134
Capital expenditures	41,531	42,798	$ 91,090	83,882
CAPP - Met | Virginia
Segment Reporting Information [Line Items]
Number of active mines | mine			4
Number of preparation plants | plant			2
CAPP - Met | West Virginia
Segment Reporting Information [Line Items]
Number of active mines | mine			18
Number of preparation plants | plant			5
CAPP - Thermal | West Virginia
Segment Reporting Information [Line Items]
Number of active mines | mine			3
Number of preparation plants | plant			2
NAPP | Pennsylvania
Segment Reporting Information [Line Items]
Number of active mines | mine			1
Number of preparation plants | plant			1
Number of closed mines | mine			1
Operating Segments | CAPP - Met
Segment Reporting Information [Line Items]
Total revenues	316,534	494,525	$ 679,293	967,328
Depreciation, depletion and amortization	38,800	38,829	80,522	75,502
Amortization of acquired intangibles, net	2,759	3,870	5,340	1,050
Adjusted EBITDA	17,617	123,051	86,821	224,683
Capital expenditures	27,647	28,106	60,781	57,692
Operating Segments | CAPP - Thermal
Segment Reporting Information [Line Items]
Total revenues	36,313	82,035	75,581	145,266
Depreciation, depletion and amortization	7,260	16,502	12,109	30,614
Amortization of acquired intangibles, net	(903)	(4,213)	(2,998)	(8,782)
Adjusted EBITDA	2,492	11,034	304	6,751
Capital expenditures	2,504	5,190	5,584	7,659
Operating Segments | NAPP
Segment Reporting Information [Line Items]
Total revenues	57,986	78,928	125,543	151,304
Depreciation, depletion and amortization	2,172	6,522	9,021	13,149
Amortization of acquired intangibles, net	215	0	569	706
Adjusted EBITDA	9,036	21,298	13,395	26,052
Capital expenditures	10,873	8,204	24,169	16,203
All Other
Segment Reporting Information [Line Items]
Total revenues	1,005	718	1,881	1,422
Depreciation, depletion and amortization	1,030	961	2,075	4,820
Amortization of acquired intangibles, net	25	0	50	0
Adjusted EBITDA	(12,242)	(14,631)	(23,377)	(33,352)
Capital expenditures	$ 507	$ 1,298	$ 556	$ 2,328

Segment Information - Reconcili

Segment Information - Reconciliation of Net Income (Loss) to Adjusted EBITDA (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Segment Reporting, Other Significant Reconciling Item [Line Items]
Net (loss) income from continuing operations	$ (238,301)	$ 24,300	$ (278,109)	$ 32,290
Interest expense	18,814	16,077	36,419	31,232
Interest income	(5,533)	(1,885)	(6,511)	(3,821)
Income tax expense (benefit)	33	(1,000)	(2,155)	(5,778)
Depreciation, depletion and amortization	49,262	62,814	103,727	124,085
Merger-related costs	0	156	0	987
Non-cash stock compensation expense	1,044	(546)	3,122	4,725
Mark-to-market adjustment - acquisition-related obligations		1,014	(17,049)	2,950
Mark-to-market adjustment for acquisition-related obligations	(2,052)	1,014	(17,049)	2,950
Accretion on asset retirement obligations	7,304	6,847	14,679	13,079
Loss on modification and extinguishment of debt	0	26,459	0	26,459
Asset impairment	161,738	5,826	195,447	5,826
Asset impairment and restructuring			217,882	22,294
Loss on partial settlement of benefit obligations	63		1,230
Cost impact of coal inventory fair value adjustment		1,033		8,209
Gain on assets acquired in an exchange transaction			0	(9,083)
Amortization of acquired intangibles, net	2,096	(343)	2,961	(7,026)
Adjusted EBITDA	16,903	140,752	77,143	224,134
Restructuring expense	22,435	0	22,435	0
Strategic Actions with Respect to Two Thermal Coal Mining Complexes
Segment Reporting, Other Significant Reconciling Item [Line Items]
Asset impairment and restructuring	184,173		217,882
Management restructuring costs	20,553		20,553
Restructuring expense	22,435		22,435
Senior Management Changes
Segment Reporting, Other Significant Reconciling Item [Line Items]
Management restructuring costs			947
Operating Segments | CAPP - Met
Segment Reporting, Other Significant Reconciling Item [Line Items]
Net (loss) income from continuing operations	(26,987)	70,600	(38,451)	140,984
Interest expense	(376)	194	(1,306)	222
Interest income	(2)	(4)	(60)	(8)
Income tax expense (benefit)	0	0	0	0
Depreciation, depletion and amortization	38,800	38,829	80,522	75,502
Merger-related costs		0		0
Non-cash stock compensation expense	(94)	376	305	779
Mark-to-market adjustment - acquisition-related obligations		0	0	0
Mark-to-market adjustment for acquisition-related obligations	0
Accretion on asset retirement obligations	3,517	2,327	7,019	4,660
Loss on modification and extinguishment of debt		0		0
Asset impairment		5,826		5,826
Loss on partial settlement of benefit obligations	0		0
Cost impact of coal inventory fair value adjustment		1,033		4,751
Gain on assets acquired in an exchange transaction				(9,083)
Amortization of acquired intangibles, net	2,759	3,870	5,340	1,050
Adjusted EBITDA	17,617	123,051	86,821	224,683
Operating Segments | CAPP - Met | Strategic Actions with Respect to Two Thermal Coal Mining Complexes
Segment Reporting, Other Significant Reconciling Item [Line Items]
Asset impairment and restructuring	0		32,951
Operating Segments | CAPP - Met | Senior Management Changes
Segment Reporting, Other Significant Reconciling Item [Line Items]
Management restructuring costs			501
Operating Segments | CAPP - Thermal
Segment Reporting, Other Significant Reconciling Item [Line Items]
Net (loss) income from continuing operations	(25,830)	(3,932)	(33,896)	(23,337)
Interest expense	2	6	4	10
Interest income	0	0	0	0
Income tax expense (benefit)	0	0	0	0
Depreciation, depletion and amortization	7,260	16,502	12,109	30,614
Merger-related costs		0		0
Non-cash stock compensation expense	1	5	8	57
Mark-to-market adjustment - acquisition-related obligations		0	0	0
Mark-to-market adjustment for acquisition-related obligations	0
Accretion on asset retirement obligations	2,267	2,666	4,619	4,731
Loss on modification and extinguishment of debt		0		0
Asset impairment		0		0
Loss on partial settlement of benefit obligations	0		0
Cost impact of coal inventory fair value adjustment		0		3,458
Gain on assets acquired in an exchange transaction				0
Amortization of acquired intangibles, net	(903)	(4,213)	(2,998)	(8,782)
Adjusted EBITDA	2,492	11,034	304	6,751
Operating Segments | CAPP - Thermal | Strategic Actions with Respect to Two Thermal Coal Mining Complexes
Segment Reporting, Other Significant Reconciling Item [Line Items]
Asset impairment and restructuring	19,695		20,453
Restructuring expense	2,310		2,310
Operating Segments | CAPP - Thermal | Senior Management Changes
Segment Reporting, Other Significant Reconciling Item [Line Items]
Management restructuring costs			5
Operating Segments | NAPP
Segment Reporting, Other Significant Reconciling Item [Line Items]
Net (loss) income from continuing operations	(156,092)	13,771	(159,132)	10,186
Interest expense	(504)	0	(1,074)	1
Interest income	(4)	(11)	(14)	(23)
Income tax expense (benefit)	0	0	0	0
Depreciation, depletion and amortization	2,172	6,522	9,021	13,149
Merger-related costs		0		0
Non-cash stock compensation expense	0	0	0	0
Mark-to-market adjustment - acquisition-related obligations		0	0	0
Mark-to-market adjustment for acquisition-related obligations	0
Accretion on asset retirement obligations	769	1,016	1,539	2,033
Loss on modification and extinguishment of debt		0		0
Asset impairment		0		0
Loss on partial settlement of benefit obligations	0		0
Cost impact of coal inventory fair value adjustment		0		0
Gain on assets acquired in an exchange transaction				0
Amortization of acquired intangibles, net	215	0	569	706
Adjusted EBITDA	9,036	21,298	13,395	26,052
Operating Segments | NAPP | Strategic Actions with Respect to Two Thermal Coal Mining Complexes
Segment Reporting, Other Significant Reconciling Item [Line Items]
Asset impairment and restructuring	162,480		162,480
Restructuring expense	18,132		18,132
Operating Segments | NAPP | Senior Management Changes
Segment Reporting, Other Significant Reconciling Item [Line Items]
Management restructuring costs			6
All Other
Segment Reporting, Other Significant Reconciling Item [Line Items]
Net (loss) income from continuing operations	(29,392)	(56,139)	(46,630)	(95,543)
Interest expense	19,692	15,877	38,795	30,999
Interest income	(5,527)	(1,870)	(6,437)	(3,790)
Income tax expense (benefit)	33	(1,000)	(2,155)	(5,778)
Depreciation, depletion and amortization	1,030	961	2,075	4,820
Merger-related costs		156		987
Non-cash stock compensation expense	1,137	(927)	2,809	3,889
Mark-to-market adjustment - acquisition-related obligations		1,014	(17,049)	2,950
Mark-to-market adjustment for acquisition-related obligations	(2,052)
Accretion on asset retirement obligations	751	838	1,502	1,655
Loss on modification and extinguishment of debt		26,459		26,459
Asset impairment		0		0
Loss on partial settlement of benefit obligations	63		1,230
Cost impact of coal inventory fair value adjustment		0		0
Gain on assets acquired in an exchange transaction				0
Amortization of acquired intangibles, net	25	0	50	0
Adjusted EBITDA	(12,242)	$ (14,631)	(23,377)	$ (33,352)
All Other | Strategic Actions with Respect to Two Thermal Coal Mining Complexes
Segment Reporting, Other Significant Reconciling Item [Line Items]
Asset impairment and restructuring	1,998		1,998
Restructuring expense	$ 1,993		1,993
All Other | Senior Management Changes
Segment Reporting, Other Significant Reconciling Item [Line Items]
Management restructuring costs			$ 435

Segment Information - Revenue f

Segment Information - Revenue from External Customers (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Revenues from External Customers and Long-Lived Assets [Line Items]
Coal revenues	$ 410,614	$ 653,828	$ 878,981	$ 1,260,788
Export coal revenues
Revenues from External Customers and Long-Lived Assets [Line Items]
Coal revenues	252,273	362,838	509,011	706,144
India
Revenues from External Customers and Long-Lived Assets [Line Items]
Coal revenues	60,457	$ 71,991	116,442	$ 197,589
Brazil
Revenues from External Customers and Long-Lived Assets [Line Items]
Coal revenues	$ 46,193		$ 96,773
Geographic Concentration Risk | Export coal revenues | Revenues
Revenues from External Customers and Long-Lived Assets [Line Items]
Concentration risk percentage	61.00%	55.00%	58.00%	56.00%