Arch Resources (ARCH) 10-Q 27 Jul 17 2017 Q2 Quarterly report Financial data

Document And Entity Information

Document And Entity Information - shares	6 Months Ended
	Jun. 30, 2017	Jul. 21, 2017
Document and Entity Information [Abstract]
Entity Registrant Name	ARCH COAL INC
Entity Central Index Key	1,037,676
Document Type	10-Q
Document Period End Date	Jun. 30, 2017
Amendment Flag	false
Current Fiscal Year End Date	--12-31
Document Fiscal Year Focus	2,017
Document Fiscal Period Focus	Q2
Entity Filer Category	Non-accelerated Filer
Entity Common Stock, Shares Outstanding		24,310,578

Condensed Consolidated Statemen

Condensed Consolidated Statements of Operations - USD ($) shares in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Costs, expenses and other operating
Asset impairment and mine closure costs		$ 43,700,000
Successor
Revenues	$ 549,866,000		$ 1,150,841,000
Costs, expenses and other operating
Cost of sales (exclusive of items shown separately below)	435,038,000		896,448,000
Depreciation, depletion and amortization	30,701,000		62,622,000
Accretion on asset retirement obligations	7,623,000		15,246,000
Amortization of sales contracts, net	14,352,000		29,042,000
Change in fair value of coal derivatives and coal trading activities, net	863,000		1,717,000
Asset impairment and mine closure costs	0		0
Selling, general and administrative expenses	22,146,000		42,669,000
Other operating income, net	(3,549,000)		(5,859,000)
Total operating expenses	507,174,000		1,041,885,000
Income (loss) from operations	42,692,000		108,956,000
Interest expense, net
Interest expense	(6,003,000)		(15,428,000)
Interest and investment income	842,000		1,369,000
Interest expense, net	(5,161,000)		(14,059,000)
Income (loss) before nonoperating expenses	37,531,000		94,897,000
Nonoperating expenses
Net loss resulting from early retirement of debt and debt restructuring	(31,000)		(2,061,000)
Reorganization items, net	(21,000)		(2,849,000)
Nonoperating income (expense)	(52,000)		(4,910,000)
Income (loss) before income taxes	37,479,000		89,987,000
Provision for (benefit from) income taxes	319,000		1,159,000
Net income (loss)	$ 37,160,000		$ 88,828,000
Net income (loss) per common share
Basic earnings (loss) per common share (in dollars per share)	$ 1.51		$ 3.58
Diluted earnings (loss) per common share (in dollars per share)	$ 1.48		$ 3.52
Weighted average shares outstanding
Basic weighted average shares outstanding (shares)	24,659		24,834
Diluted weighted average shares outstanding (shares)	25,082		25,245
Dividends declared per common share (in dollars per share)	$ 0.35		$ 0.35
Predecessor
Revenues		420,298,000		$ 848,404,000
Costs, expenses and other operating
Cost of sales (exclusive of items shown separately below)		410,992,000		822,002,000
Depreciation, depletion and amortization		58,459,000		122,158,000
Accretion on asset retirement obligations		8,050,000		16,356,000
Amortization of sales contracts, net		1,000		(832,000)
Change in fair value of coal derivatives and coal trading activities, net		1,158,000		2,368,000
Asset impairment and mine closure costs		43,701,000		129,221,000
Selling, general and administrative expenses		19,019,000		38,845,000
Other operating income, net		(10,561,000)		(12,781,000)
Total operating expenses		530,819,000		1,117,337,000
Income (loss) from operations		(110,521,000)		(268,933,000)
Interest expense, net
Interest expense		(45,273,000)		(89,724,000)
Interest and investment income		933,000		2,071,000
Interest expense, net		(44,340,000)		(87,653,000)
Income (loss) before nonoperating expenses		(154,861,000)		(356,586,000)
Nonoperating expenses
Net loss resulting from early retirement of debt and debt restructuring		0		(2,213,000)
Reorganization items, net		(21,271,000)		(25,146,000)
Nonoperating income (expense)		(21,271,000)		(27,359,000)
Income (loss) before income taxes		(176,132,000)		(383,945,000)
Provision for (benefit from) income taxes		(245,000)		(1,356,000)
Net income (loss)		$ (175,887,000)		$ (382,589,000)
Net income (loss) per common share
Basic earnings (loss) per common share (in dollars per share)		$ (8.26)		$ (17.97)
Diluted earnings (loss) per common share (in dollars per share)		$ (8.26)		$ (17.97)
Weighted average shares outstanding
Basic weighted average shares outstanding (shares)		21,293		21,293
Diluted weighted average shares outstanding (shares)		21,293		21,293
Dividends declared per common share (in dollars per share)		$ 0		$ 0

Condensed Consolidated Stateme3

Condensed Consolidated Statements of Comprehensive Income (Loss) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Successor
Net income (loss)	$ 37,160		$ 88,828
Derivative instruments
Comprehensive income (loss) before tax	257		276
Income tax benefit (provision)	0		0
Derivatives qualifying as hedges, adjustment, net of tax	257		276
Pension, postretirement and other post-employment benefits
Comprehensive income (loss) before tax	3,154		3,154
Income tax benefit (provision)	0		0
Pension and other postretirement benefit plans, adjustment, net of tax	3,154		3,154
Available-for-sale securities
Comprehensive income (loss) before tax	0		(387)
Income tax benefit (provision)	0		0
Available-for-sale securities adjustment, net of tax	0		(387)
Total other comprehensive income (loss)	3,411		3,043
Total comprehensive income (loss)	$ 40,571		$ 91,871
Predecessor
Net income (loss)		$ (175,887)		$ (382,589)
Derivative instruments
Comprehensive income (loss) before tax		(162)		(386)
Income tax benefit (provision)		0		81
Derivatives qualifying as hedges, adjustment, net of tax		(162)		(305)
Pension, postretirement and other post-employment benefits
Comprehensive income (loss) before tax		(2,749)		(4,087)
Income tax benefit (provision)		0		481
Pension and other postretirement benefit plans, adjustment, net of tax		(2,749)		(3,606)
Available-for-sale securities
Comprehensive income (loss) before tax		504		3,407
Income tax benefit (provision)		0		(1,043)
Available-for-sale securities adjustment, net of tax		504		2,364
Total other comprehensive income (loss)		(2,407)		(1,547)
Total comprehensive income (loss)		$ (178,294)		$ (384,136)

Condensed Consolidated Balance

Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Current assets
Cash and cash equivalents	$ 333,548	$ 305,372
Short term investments	159,822	88,072
Restricted cash	41,755	71,050
Trade accounts receivable	190,256	184,483
Other receivables	21,504	19,877
Inventories	137,056	113,462
Other current assets	61,474	96,306
Total current assets	945,415	878,622
Property, plant and equipment, net	1,007,570	1,053,603
Other assets
Equity investments	104,015	96,074
Other noncurrent assets	75,058	108,298
Total other assets	179,073	204,372
Total assets	2,132,058	2,136,597
Current Liabilities
Accounts payable	127,059	95,953
Accrued expenses and other current liabilities	169,533	205,240
Current maturities of debt	7,414	11,038
Total current liabilities	304,006	312,231
Long-term debt	315,639	351,841
Asset retirement obligations	342,680	337,227
Accrued pension benefits	32,092	38,884
Accrued postretirement benefits other than pension	101,407	101,445
Accrued workers’ compensation	186,128	184,568
Other noncurrent liabilities	65,048	63,824
Total liabilities	1,347,000	1,390,020
Stockholders' equity
Common stock, $0.01 par value, authorized 300,000 shares, issued 25,021 shares and 25,002 shares at June 30, 2017 and December 31, 2016, respectively	250	250
Paid-in capital	694,780	688,424
Retained earnings	113,574	33,449
Treasury stock, 711 shares at June 30, 2017, at cost	(51,043)	0
Accumulated other comprehensive income	27,497	24,454
Total stockholders’ equity	785,058	746,577
Total liabilities and stockholders’ equity	$ 2,132,058	$ 2,136,597

Condensed Consolidated Balance5

Condensed Consolidated Balance Sheets (Parenthetical) - $ / shares	Jun. 30, 2017	Dec. 31, 2016
Statement of Financial Position [Abstract]
Common stock, par value (in usd per share)	$ 0.01	$ 0.01
Common stock, shares authorized	300,000,000	300,000,000
Common stock, shares issued	25,021,000	25,002,000
Treasury stock, shares	711

Condensed Consolidated Stateme6

Condensed Consolidated Statements of Cash Flows - USD ($)	6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016
Financing activities
Net loss resulting from early retirement of debt and debt restructuring	$ (2,100,000)	$ (2,200,000)
Cash and cash equivalents, beginning of period	305,372,000
Cash and cash equivalents, end of period	333,548,000
Successor
Operating activities
Net income (loss)	88,828,000
Adjustments to reconcile to cash provided by operating activities:
Depreciation, depletion and amortization	62,622,000
Accretion on asset retirement obligations	15,246,000
Amortization of sales contracts, net	29,042,000
Prepaid royalties expensed	2,288,000
Deferred income taxes	5,996,000
Employee stock-based compensation expense	4,942,000
Gains on disposals and divestitures, net	(2,005,000)
Asset impairment and non-cash mine closure costs	0
Net loss resulting from early retirement of debt and debt restructuring	2,061,000
Non-cash bankruptcy reorganization items	0
Amortization relating to financing activities	1,565,000
Changes in:
Receivables	(3,864,000)
Inventories	(23,594,000)
Accounts payable, accrued expenses and other current liabilities	(89,000)
Income taxes, net	(3,796,000)
Other	21,557,000
Cash provided by (used in) operating activities	200,799,000
Investing activities
Capital expenditures	(16,922,000)
Minimum royalty payments	(4,211,000)
Proceeds from (consideration paid for) disposals and divestitures	4,186,000
Purchases of short term investments	(157,364,000)
Proceeds from sales of short term investments	85,035,000
Investments in and advances to affiliates, net	(8,934,000)
Withdrawals (deposits) of restricted cash	29,295,000
Cash used in investing activities	(68,915,000)
Financing activities
Proceeds from issuance of term loan due 2024	298,500,000
Payments to extinguish term loan due 2021	(325,684,000)
Payments on term loan due 2024	(750,000)
Net payments on other debt	(5,207,000)
Debt financing costs	(8,900,000)
Net loss resulting from early retirement of debt and debt restructuring	(2,061,000)
Dividends paid	(8,563,000)
Purchases of treasury stock	(51,043,000)
Cash used in financing activities	(103,708,000)
Increase (decrease) in cash and cash equivalents	28,176,000
Cash and cash equivalents, beginning of period	305,372,000
Cash and cash equivalents, end of period	$ 333,548,000
Predecessor
Operating activities
Net income (loss)		(382,589,000)
Adjustments to reconcile to cash provided by operating activities:
Depreciation, depletion and amortization		122,158,000
Accretion on asset retirement obligations		16,356,000
Amortization of sales contracts, net		(832,000)
Prepaid royalties expensed		1,770,000
Deferred income taxes		(418,000)
Employee stock-based compensation expense		1,435,000
Gains on disposals and divestitures, net		(6,269,000)
Asset impairment and non-cash mine closure costs		119,194,000
Net loss resulting from early retirement of debt and debt restructuring		2,213,000
Non-cash bankruptcy reorganization items		(14,892,000)
Amortization relating to financing activities		7,657,000
Changes in:
Receivables		(7,776,000)
Inventories		21,152,000
Accounts payable, accrued expenses and other current liabilities		84,160,000
Income taxes, net		(937,000)
Other		(22,634,000)
Cash provided by (used in) operating activities		(60,252,000)
Investing activities
Capital expenditures		(74,137,000)
Minimum royalty payments		(217,000)
Proceeds from (consideration paid for) disposals and divestitures		(3,303,000)
Purchases of short term investments		(98,750,000)
Proceeds from sales of short term investments		94,589,000
Investments in and advances to affiliates, net		(2,890,000)
Withdrawals (deposits) of restricted cash		(4,695,000)
Cash used in investing activities		(89,403,000)
Financing activities
Payments on term loan due 2024		0
Net payments on other debt		(10,293,000)
Debt financing costs		(18,806,000)
Net loss resulting from early retirement of debt and debt restructuring		(2,213,000)
Dividends paid		0
Purchases of treasury stock		0
Cash used in financing activities		(31,312,000)
Increase (decrease) in cash and cash equivalents		(180,967,000)
Cash and cash equivalents, beginning of period		450,781,000
Cash and cash equivalents, end of period		$ 269,814,000

Basis of Presentation

Basis of Presentation	6 Months Ended
	Jun. 30, 2017
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Basis of Presentation	Basis of Presentation The accompanying unaudited condensed consolidated financial statements include the accounts of Arch Coal, Inc. ("Arch Coal") and its subsidiaries (the “Company”). Unless the context indicates otherwise, the terms “Arch” and the “Company” are used interchangeably in this Quarterly Report on Form 10-Q refer to both the Predecessor and Successor Company. The Company’s primary business is the production of thermal and metallurgical coal from surface and underground mines located throughout the United States, for sale to utility, industrial and steel producers both in the United States and around the world. The Company currently operates mining complexes in West Virginia, Kentucky, Virginia, Illinois, Wyoming and Colorado. All subsidiaries are wholly-owned. Intercompany transactions and accounts have been eliminated in consolidation. The accompanying unaudited condensed consolidated financial statements have been prepared in accordance with accounting principles generally accepted in the United States for interim financial reporting and U.S. Securities and Exchange Commission regulations. In the opinion of management, all adjustments, consisting of normal, recurring accruals considered necessary for a fair presentation, have been included. Results of operations for the three and six months ended June 30, 2017 are not necessarily indicative of results to be expected for the year ending December 31, 2017 . These financial statements should be read in conjunction with the audited financial statements and related notes as of and for the year ended December 31, 2016 included in the Company’s Annual Report on Form 10-K filed with the U.S. Securities and Exchange Commission. On January 11, 2016 (the “Petition Date”), Arch Coal and substantially all of its wholly owned domestic subsidiaries (the “Filing Subsidiaries” and, together with Arch Coal, the “Debtors”; the Debtors, solely following the effective date of the Plan, the “Reorganized Debtors”) filed voluntary petitions for reorganization (collectively, the “Bankruptcy Petitions”) under Chapter 11 of Title 11 of the U.S. Code (the “Bankruptcy Code”) in the United States Bankruptcy Court for the Eastern District of Missouri (the “Court”). The Debtors’ Chapter 11 Cases (collectively, the “Chapter 11 Cases”) were jointly administered under the caption In re Arch Coal, Inc., et al. Case No. 16-40120 (lead case). During the Chapter 11 Cases, each Debtor operated its business as a “debtor in possession” under the jurisdiction of the Court and in accordance with the applicable provisions of the Bankruptcy Code and the orders of the Court. Upon emergence from bankruptcy on October 5, 2016, Arch Coal applied the provisions of fresh start accounting effective October 1, 2016 which resulted in Arch becoming a new entity for financial reporting purposes. Accordingly, the consolidated financial statements and accompanying footnotes on or after October 1, 2016 are not comparable to the consolidated financial statements prior to that date. References to “Successor” in the consolidated financial statements and footnotes are in reference to reporting dates on or after October 2, 2016; references to “Predecessor” in the consolidated financial statements and footnotes are in reference to reporting dates through October 1, 2016 which includes the impact of the Plan provisions and the application of fresh start accounting.

Accounting Policies

Accounting Policies	6 Months Ended
	Jun. 30, 2017
Accounting Policies [Abstract]
Accounting Policies	Accounting Policies Recently Adopted Accounting Guidance In March 2016, the FASB issued Accounting Standards Update No. 2016-09, Compensation – Stock Compensation (Topic 718) ("ASU 2016-09"). ASU 2016-09 identifies areas for simplification involving several aspects of accounting for share-based payment transactions, including the income tax consequences, classification of awards as either equity or liabilities, an option to recognize gross stock compensation expense with actual forfeitures recognized as they occur, as well as certain classifications on the statement of cash flows. The Company adopted all provisions of this new accounting standard in the first quarter of 2017 and changed its forfeiture policy to recognize the impact of forfeitures when they occur from estimating expected forfeitures in determining stock-based compensation expense. There was no material impact to the Company's financial statements. Recent Accounting Guidance Issued Not Yet Effective In May 2014, the FASB issued ASU No. 2014-09, “Revenue from Contracts with Customers.” ASU 2014-09 is a comprehensive revenue recognition standard that will supersede nearly all existing revenue recognition guidance under current U.S. GAAP and replace it with a principle based approach for determining revenue recognition. ASU 2014-09 will require that companies recognize revenue based on the value of transferred goods or services as they occur in the contract. The ASU also will require additional disclosure about the nature, amount, timing and uncertainty of revenue and cash flows arising from customer contracts, including significant judgments and changes in judgments and assets recognized from costs incurred to obtain or fulfill a contract. ASU 2014-09 is effective for interim and annual periods beginning after December 15, 2017. Early adoption is permitted only in annual reporting periods beginning after December 15, 2016, including interim periods therein. Entities will be able to transition to the standard either retrospectively or as a cumulative-effect adjustment as of the date of adoption. The Company’s primary source of revenue is from the sale of coal through both short-term and long-term contracts with utilities, industrial customers and steel producers whereby revenue is currently recognized when risk of loss has passed to the customer. Upon adoption of this new standard, the Company believes that the timing of revenue recognition related to its coal sales will remain consistent with its current practice. The Company is in the process of reviewing its portfolio of coal sales contracts and the various terms and clauses within each contract. Additionally, the Company is evaluating other revenue streams to determine the potential impact related to the adoption of the standard, as well as potential disclosures required by the standard. The Company will be adopting the standard under the modified retrospective approach. In March 2017, the FASB issued ASU 2017-07, Compensation-Retirement Benefits (Topic 715) Improving the Presentation of Net Periodic Pension Cost and Net Periodic Postretirement Benefit Cost. ASU 2017-07 changes the income statement presentation of defined benefit plan expense by requiring separation between operating expense (service cost component) and non-operating expense (all other components, including interest cost, amortization of prior service cost, curtailments and settlements, etc.). The operating expense component is reported with similar compensation costs while the non-operating components are reported in Nonoperating expense. In addition, only the service cost component is eligible for capitalization as part of an asset such as inventory or property, plant and equipment. The Company is currently assessing the impact that adopting this new accounting standard will have on its consolidated financial statements. The ASU is effective for public companies for fiscal years beginning after December 15, 2017, and interim periods therein; early adoption is permitted.

Accumulated Other Comprehensive

Accumulated Other Comprehensive Income	6 Months Ended
	Jun. 30, 2017
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]
Accumulated Other Comprehensive Income	Accumulated Other Comprehensive Income The following items are included in accumulated other comprehensive income ("AOCI"): Pension, Postretirement and Other Accumulated Post- Other Derivative Employment Available-for- Comprehensive Instruments Benefits Sale Securities Income (In thousands) Balance at December 31, 2016 $ — $ 24,067 $ 387 $ 24,454 Unrealized gains (losses) 276 3,641 (55 ) 3,862 Amounts reclassified from AOCI — (487 ) (332 ) (819 ) Balance at June 30, 2017 $ 276 $ 27,221 $ — $ 27,497 The following amounts were reclassified out of AOCI: Successor Predecessor Successor Predecessor Line Item in the Condensed Consolidated Statement of Operations Details About AOCI Components Three Months Ended June 30, 2017 Three Months Ended June 30, 2016 Six Months Ended June 30, 2017 Six Months Ended June 30, 2016 (In thousands) Derivative instruments $ — $ 96 $ — $ 321 Revenues — — — (81 ) Provision for (benefit from) income taxes $ — $ 96 $ — $ 240 Net of tax Pension, postretirement and other post-employment benefits Amortization of prior service credits $ — $ 2,672 $ — $ 5,344 Amortization of actuarial gains (losses), net — 77 — (1,257 ) Pension settlement 487 — 487 — 487 2,749 487 4,087 — — — (481 ) Provision for (benefit from) income taxes $ 487 $ 2,749 $ 487 $ 3,606 Net of tax Available-for-sale securities $ — $ — $ 332 $ (2,895 ) Interest and investment income — — — 1,038 Provision for (benefit from) income taxes $ — $ — $ 332 $ (1,857 ) Net of tax

Reorganization items, net

Reorganization items, net	6 Months Ended
	Jun. 30, 2017
Discontinued Operations and Disposal Groups [Abstract]
Reorganization items, net	Reorganization items, net In accordance with Accounting Codification Standard 852, “Reorganizations,” the statement of operations shall portray the results of operations of the reporting entity while it is in Chapter 11. Revenues, expenses (including professional fees), realized gains and losses, and provisions for losses resulting from reorganization and restructuring of the business shall be reported separately as reorganization items. During the three months ended June 30, 2017 and 2016 , the Company recorded a minimal charge in the current quarter and $21.3 million , respectively in “Reorganization items, net” primarily comprised of professional fee expenses. Net cash paid for “Reorganization items, net” totaled $0.9 million and $13.6 million during the three months ended June 30, 2017 and 2016 , respectively. During the six months ended June 30, 2017 and 2016 , the Company recorded a charge of $2.8 million and $25.1 million , respectively, in “Reorganization items, net.” The 2017 amount is primarily comprised of professional fees and 2016 is comprised of $40.0 million in professional fees, partially offset by non-cash gains on rejected contracts of $14.9 million . Net cash paid for “Reorganization items, net” totaled $4.7 million and $15.1 million during the six months ended June 30, 2017 and 2016 .

Asset Impairments and Mine Clos

Asset Impairments and Mine Closure Costs	6 Months Ended
	Jun. 30, 2017
Discontinued Operations and Disposal Groups [Abstract]
Asset Impairment and Mine Closure Costs	Asset Impairment and Mine Closure Costs During the second quarter of 2016 , the Company recorded $43.7 million of “Asset impairment and mine closure costs” in the Condensed Consolidated Statements of Operations. The amount included the following: a $38.0 million impairment of the Company’s equity investment in a brownfield bulk commodity terminal on the Columbia River in Longview, Washington as the Company relinquished its ownership rights in exchange for future throughput rights; $3.6 million curtailment charge related to the Company’s pension, postretirement health and black lung actuarial liabilities due to headcount reductions in the first half of 2016 ; and $2.1 million of severance expense related to headcount reductions during the quarter. During the first quarter of 2016 , the Company recorded $85.5 million of “Asset impairment and mine closure costs” in the Condensed Consolidated Statements of Operations. The amount included the following: a $74.1 million impairment of coal reserves and surface land in Kentucky that are being leased to a mining company that idled its mining operations related to those reserves during the quarter; $5.1 million of severance expense related to headcount reductions at Company operations; $3.4 million related to an impairment charge on the portion of an advance royalty balance on a reserve base mined at the Company’s Mountain Laurel operation that was no longer deemed recoupable; and $2.9 million related to an other-than-temporary-impairment charge on an available-for-sale security.

Inventories

Inventories	6 Months Ended
	Jun. 30, 2017
Inventory Disclosure [Abstract]
Inventories	Inventories Inventories consist of the following: June 30, December 31, 2017 2016 (In thousands) Coal $ 60,887 $ 37,268 Repair parts and supplies 76,169 76,194 $ 137,056 $ 113,462 The repair parts and supplies are stated net of an allowance for slow-moving and obsolete inventories of $0.1 million at June 30, 2017 and $0.0 million at December 31, 2016 .

Investments in Available-for-Sa

Investments in Available-for-Sale Securities	6 Months Ended
	Jun. 30, 2017
Available-for-sale Securities [Abstract]
Investments in Available-for-Sale Securities	Investments in Available-for-Sale Securities The Company has invested in marketable debt securities, primarily highly liquid U.S. Treasury securities and investment grade corporate bonds. These investments are held in the custody of a major financial institution. These securities, along with the Company’s investments in marketable equity securities, are classified as available-for-sale securities and, accordingly, the unrealized gains and losses are recorded through other comprehensive income. The Company’s investments in available-for-sale marketable securities are as follows: June 30, 2017 Balance Sheet Classification Gross Unrealized Fair Short-Term Other Cost Basis Gains Losses Value Investments Assets (In thousands) Available-for-sale: U.S. treasury securities $ 57,382 $ 32 $ (24 ) $ 57,390 $ 57,390 $ — Corporate notes and bonds 102,497 10 (75 ) 102,432 102,432 — Total Investments $ 159,879 $ 42 $ (99 ) $ 159,822 $ 159,822 $ — December 31, 2016 Balance Sheet Classification Gross Unrealized Fair Short-Term Other Cost Basis Gains Losses Value Investments Assets (In thousands) Available-for-sale: Corporate notes and bonds $ 88,161 $ — $ (89 ) $ 88,072 $ 88,072 $ — Equity securities 1,749 388 — 2,137 — 2,137 Total Investments $ 89,910 $ 388 $ (89 ) $ 90,209 $ 88,072 $ 2,137 The aggregate fair value of investments with unrealized losses that were owned for less than a year was $92.0 million and $47.6 million at June 30, 2017 and December 31, 2016 , respectively. The aggregate fair value of investments with unrealized losses that were owned for over a year was $20.7 million and $40.4 million at June 30, 2017 and December 31, 2016 , respectively. The unrealized losses in the Company’s portfolio at June 30, 2017 are the result of normal market fluctuations. The Company does not currently intend to sell these investments before recovery of their amortized cost base. The debt securities outstanding at June 30, 2017 have maturity dates ranging from the third quarter of 2017 through the third quarter of 2018 . The Company classifies its investments as current based on the nature of the investments and their availability to provide cash for use in current operations.

Sales Contracts

Sales Contracts	6 Months Ended
	Jun. 30, 2017
Acquired Sales Contracts [Abstract]
Sales Contracts	Sales Contracts The sales contracts reflected in the consolidated balance sheets are as follows: June 30, 2017 December 31, 2016 Assets Liabilities Net Total Assets Liabilities Net Total (In thousands) (In thousands) Original fair value $ 97,196 $ 31,742 $ 97,196 $ 31,742 Accumulated amortization (59,408 ) (29,569 ) (25,625 ) (24,829 ) Total $ 37,788 $ 2,173 $ 35,615 $ 71,571 $ 6,913 $ 64,658 Balance Sheet classification: Other current $ 31,670 $ 827 $ 59,702 $ 5,114 Other noncurrent $ 6,118 $ 1,346 $ 11,869 $ 1,799 The Company anticipates amortization of sales contracts, based upon expected shipments in the next five years, to be an expense of approximately $54.4 million in 2017, $11.1 million in 2018, income of $0.6 million in 2019, and income of $0.1 million in 2020 and 2021.

Derivatives

Derivatives	6 Months Ended
	Jun. 30, 2017
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Derivatives	Derivatives Diesel fuel price risk management The Company is exposed to price risk with respect to diesel fuel purchased for use in its operations. The Company anticipates purchasing approximately 40 to 45 million gallons of diesel fuel for use in its operations during 2017 . To protect the Company’s cash flows from increases in the price of diesel fuel for its operations, the Company uses forward physical diesel purchase contracts and purchased heating oil call options. At June 30, 2017 , the Company had protected the price of approximately 70% of its expected diesel fuel purchases for the remainder of 2017 at an average strike price of $1.82 per gallon. Additionally, the Company has protected approximately 25% of its expected 2018 purchases with call options with an average strike price of $1.81 per gallon. At June 30, 2017 , the Company had outstanding heating oil call options for approximately 27 million gallons for the purpose of managing the price risk associated with future diesel purchases. These positions are not designated as hedges for accounting purposes, and therefore, changes in the fair value are recorded immediately to earnings. Coal price risk management positions The Company may sell or purchase forward contracts, swaps and options in the over-the-counter coal market in order to manage its exposure to coal prices. The Company has exposure to the risk of fluctuating coal prices related to forecasted, index-priced sales or purchases of coal or to the risk of changes in the fair value of a fixed price physical sales contract. Certain derivative contracts may be designated as hedges of these risks. At June 30, 2017 , the Company held derivatives for risk management purposes that are expected to settle in the following years: (Tons in thousands) 2017 2018 Total Coal sales 371 — 371 Coal purchases 363 — 363 The Company has also entered into a nominal quantity of natural gas put options to protect the Company from decreases in natural gas prices, which could impact thermal coal demand. These options are not designated as hedges. Additionally, the Company has also entered into a nominal quantity of foreign currency put options protecting for decreases in the Australian to United States dollar exchange rate, which could impact metallurgical coal demand. These options are not designated as hedges. Coal trading positions The Company may sell or purchase forward contracts, swaps and options in the over-the-counter coal market for trading purposes. The Company is exposed to the risk of changes in coal prices on the value of its coal trading portfolio. The estimated future realization of the value of the trading portfolio is $0.6 million of losses during the remainder of 2017 and $0.8 million of losses during 2018 . Tabular derivatives disclosures The Company has master netting agreements with all of its counterparties which allow for the settlement of contracts in an asset position with contracts in a liability position in the event of default or termination. Such netting arrangements reduce the Company’s credit exposure related to these counterparties. For classification purposes, the Company records the net fair value of all the positions with a given counterparty as a net asset or liability in the Condensed Consolidated Balance Sheets. The amounts shown in the table below represent the fair value position of individual contracts, and not the net position presented in the accompanying Condensed Consolidated Balance Sheets. The fair value and location of derivatives reflected in the accompanying Condensed Consolidated Balance Sheets are as follows: June 30, 2017 December 31, 2016 Fair Value of Derivatives Asset Liability Asset Liability (In thousands) Derivative Derivative Derivative Derivative Derivatives Designated as Hedging Instruments Coal $ 17 $ — $ — $ (15 ) Derivatives Not Designated as Hedging Instruments Heating oil -- diesel purchases 661 — 4,646 — Coal -- held for trading purposes 41,813 (43,157 ) 68,948 (68,740 ) Coal -- risk management 67 (146 ) 475 (580 ) Natural gas 103 (71 ) 86 (13 ) Total 42,644 (43,374 ) 74,155 (69,333 ) Total derivatives 42,661 (43,374 ) 74,155 (69,348 ) Effect of counterparty netting (41,947 ) 41,947 (69,247 ) 69,247 Net derivatives as classified in the balance sheets $ 714 $ (1,427 ) $ (713 ) $ 4,908 $ (101 ) $ 4,807 June 30, 2017 December 31, 2016 Net derivatives as reflected on the balance sheets (in thousands) Heating oil and coal Other current assets $ 714 $ 4,908 Coal Accrued expenses and other current liabilities (1,427 ) (101 ) $ (713 ) $ 4,807 The Company had a current asset for the right to reclaim cash collateral of $4.6 million at June 30, 2017 and $2.8 million at December 31, 2016 , respectively. These amounts are not included with the derivatives presented in the table above and are included in “other current assets” in the accompanying Condensed Consolidated Balance Sheets. The effects of derivatives on measures of financial performance are as follows: Derivatives used in Cash Flow Hedging Relationships (in thousands) Three Months Ended June 30, Gain (Loss) Recognized in Other Comprehensive Income(Effective Portion) Gains (Losses) Reclassified from Other Comprehensive Income into Income (Effective Portion) Successor Predecessor Successor Predecessor 2017 2016 2017 2016 Coal sales (1) $ 49 $ (73 ) $ — $ 157 Coal purchases (2) (34 ) 6 — (61 ) Totals $ 15 $ (67 ) $ — $ 96 No ineffectiveness or amounts excluded from effectiveness testing relating to the Company’s cash flow hedging relationships were recognized in the results of operations in the three month periods ended June 30, 2017 and 2016 . Derivatives Not Designated as Hedging Instruments (in thousands) Three Months Ended June 30, Gain (Loss) Recognized Successor Predecessor 2017 2016 Coal — unrealized (3) $ — $ 19 Coal — realized (4) $ — $ (180 ) Natural gas — unrealized (3) $ (27 ) $ 235 Heating oil — diesel purchases (4) $ (1,147 ) $ 2,039 Foreign currency (4) $ — $ 34 ____________________________________________________________ Location in statement of operations: (1) — Revenues (2) — Cost of sales (3) — Change in fair value of coal derivatives and coal trading activities, net (4) — Other operating (income) expense, net Derivatives used in Cash Flow Hedging Relationships (in thousands) Six Months Ended June 30, Gain (Loss) Recognized in Other Comprehensive Income(Effective Portion) Gains (Losses) Reclassified from Other Comprehensive Income into Income Successor Predecessor Successor Predecessor 2017 2016 2017 2016 Coal sales (1) $ 269 $ (60 ) $ — $ 1,526 Coal purchases (2) (234 ) (5 ) — (1,205 ) Totals $ 35 $ (65 ) $ — $ 321 No ineffectiveness or amounts excluded from effectiveness testing relating to the Company’s cash flow hedging relationships were recognized in the results of operations in the six month periods ended June 30, 2017 and 2016 . Derivatives Not Designated as Hedging Instruments (in thousands) Six Months Ended June 30, Gain (Loss) Recognized Successor Predecessor 2017 2016 Coal — unrealized (3) $ 26 $ (1,096 ) Coal — realized (4) $ — $ (343 ) Natural gas — unrealized (3) $ (496 ) $ (384 ) Heating oil — diesel purchases (4) $ (4,725 ) $ 1,596 Foreign currency (4) $ — $ (137 ) ____________________________________________________________ Location in statement of operations: (1) — Revenues (2) — Cost of sales (3) — Change in fair value of coal derivatives and coal trading activities, net (4) — Other operating (income) expense, net Based on fair values at June 30, 2017 , amounts on derivative contracts designated as hedge instruments in cash flow hedges to be reclassified from other comprehensive income into earnings during the next twelve months are immaterial. Related to its trading portfolio, the Company recognized net unrealized and realized losses of $0.8 million and $1.0 million during the three months ended June 30, 2017 and 2016 , respectively; and net unrealized and realized losses of $1.5 million and $1.0 million during the six months ended June 30, 2017 and 2016 , respectively. Gains and losses from trading activities are included in the caption “Change in fair value of coal derivatives and coal trading activities, net” in the accompanying Condensed Consolidated Statements of Operations, and are not included in the previous tables reflecting the effects of derivatives on measures of financial performance.

Accrued Expenses and Other Curr

Accrued Expenses and Other Current Liabilities	6 Months Ended
	Jun. 30, 2017
Payables and Accruals [Abstract]
Accrued Expenses and Other Current Liabilities	Accrued Expenses and Other Current Liabilities Accrued expenses and other current liabilities consist of the following: June 30, December 31, 2017 2016 (In thousands) Payroll and employee benefits $ 51,400 $ 58,468 Taxes other than income taxes 78,132 92,733 Interest 130 8,032 Acquired sales contracts 827 5,114 Workers’ compensation 15,926 15,184 Asset retirement obligations 17,817 19,515 Other 5,301 6,194 $ 169,533 $ 205,240

Debt and Financing Arrangements

Debt and Financing Arrangements	6 Months Ended
	Jun. 30, 2017
Debt Disclosure [Abstract]
Debt and Financing Arrangements	Debt and Financing Arrangements June 30, December 31, 2017 2016 (In thousands) Term loan due 2024 ($299.3 million face value) $ 297,808 $ — Term loan due 2021 ($325.7 million face value) — 325,684 Other 32,065 37,195 Debt issuance costs (6,820 ) — 323,053 362,879 Less: current maturities of debt 7,414 11,038 Long-term debt $ 315,639 $ 351,841 Term Loan Facility On March 7, 2017, the Company entered into a new senior secured term loan credit agreement in an aggregate principal amount of $300 million (the “New Term Loan Debt Facility) with Credit Suisse AG, Cayman Islands Branch, as administrative agent and collateral agent (in such capacities, the “Agent”), and the other financial institutions from time to time party thereto (collectively, the “Lenders”). The New Term Loan Debt Facility was issued at 99.50% of the face amount and will mature on March 7, 2024. Borrowings under the New Term Loan Debt Facility bear interest at a per annum rate equal to, at the Company’s option, either (i) a London interbank offered rate plus an applicable margin of 4% , subject to a 1% LIBOR floor (the “LIBOR Rate”), or (ii) a base rate plus an applicable margin of 3% . The term loans provided under the New Term Loan Debt Facility (the “Term Loans”) are subject to quarterly principal amortization payments in an amount equal to $750,000 . The New Term Loan Debt Facility is guaranteed by all existing and future wholly owned domestic subsidiaries of the Company (collectively, the “Subsidiary Guarantors” and, together with Arch Coal, the “Loan Parties”), subject to customary exceptions, and is secured by first priority security interests on substantially all assets of the Loan Parties, including 100% of the voting equity interests of directly owned domestic subsidiaries and 65% of the voting equity interests of directly owned foreign subsidiaries, subject to customary exceptions. The Company has the right to prepay Term Loans at any time and from time to time in whole or in part without premium or penalty, upon written notice, except that any prepayment of Term Loans that bear interest at the LIBOR Rate other than at the end of the applicable interest periods therefor shall be made with reimbursement for any funding losses and redeployment costs of the Lenders resulting therefrom. The New Term Loan Debt Facility is subject to certain usual and customary mandatory prepayment events, including 100% of net cash proceeds of (i) debt issuances (other than debt permitted to be incurred under the terms of the New Term Loan Debt Facility) and (ii) non-ordinary course asset sales or dispositions, subject to customary thresholds, exceptions and reinvestment rights. The New Term Loan Debt Facility contains customary affirmative covenants and representations. The New Term Loan Debt Facility also contains customary negative covenants, which, among other things, and subject to certain exceptions, include restrictions on (i) indebtedness, (ii) liens, (iii) liquidations, mergers, consolidations and acquisitions, (iv) disposition of assets or subsidiaries, (v) affiliate transactions, (vi) creation or ownership of certain subsidiaries, partnerships and joint ventures, (vii) continuation of or change in business, (viii) restricted payments, (ix) prepayment of subordinated and junior lien indebtedness, (x) restrictions in agreements on dividends, intercompany loans and granting liens on the collateral, (xi) loans and investments, (xii) sale and leaseback transactions, (xiii) changes in organizational documents and fiscal year and (xiv) transactions with respect to bonding subsidiaries. The New Term Loan Debt Facility does not contain any financial maintenance covenant. The New Term Loan Debt Facility contains customary events of default, subject to customary thresholds and exceptions, including, among other things, (i) nonpayment of principal and nonpayment of interest and fees, (ii) a material inaccuracy of a representation or warranty at the time made, (iii) a failure to comply with any covenant, subject to customary grace periods in the case of certain affirmative covenants, (iv) cross-events of default to indebtedness of at least $50 million , (v) cross-events of default to surety, reclamation or similar bonds securing obligations with an aggregate face amount of at least $50 million , (vi) uninsured judgments in excess of $50 million , (vii) any loan document shall cease to be a legal, valid and binding agreement, (viii) uninsured losses or proceedings against assets with a value in excess of $50 million , (ix) certain ERISA events, (x) a change of control or (xi) bankruptcy or insolvency proceedings relating to the Company or any material subsidiary of the Company. On the effective date of the New Term Loan Debt Facility, all outstanding obligations under the Company’s previously existing term loan credit agreement, dated as of October 5, 2016, among the Company, as borrower, the lender party thereto and Wilmington Trust, National Association, as administrative agent and collateral agent (the “Previous First Lien Debt Facility”), other than indemnification and other contingent obligations, were paid in cash in full and the related transaction documents were terminated (other than with respect to certain provisions that customarily survive termination); there was no gain or loss recognized on the extinguishment of the previously existing term loan credit agreement. All liens on property of the Company and the guarantors thereunder arising out of or related to the Previous First Lien Debt Facility were terminated. Inventory-Based Revolving Credit Facility On April 27, 2017, the Company and certain subsidiaries of Arch Coal entered into a new senior secured inventory-based revolving credit facility in an aggregate principal amount of $40 million (the “New Inventory Facility”) with Regions Bank (“Regions”) as administrative agent and collateral agent (in such capacities, the “Agent”), as lender and swingline lender (in such capacities, the “ Lender ”) and as letter of credit issuer. Availability under the New Inventory Facility is subject to a borrowing base consisting of (i) 85% of the net orderly liquidation value of eligible coal inventory, (ii) the lesser of (x) 85% of the net orderly liquidation value of eligible parts and supplies inventory and (y) 35% of the amount determined pursuant to clause (i), and (iii) 100% of Arch Coal’s Eligible Cash (defined in the New Inventory Facility), subject to reduction for reserves imposed by Regions. The commitments under the New Inventory Facility will terminate on the date that is the earliest to occur of (i) the third anniversary of the Inventory Facility Closing Date, (ii) the date, if any, that is 364 days following the first day that Liquidity (defined in the New Inventory Facility and consistent with the definition in the Extended Securitization Facility (as defined below)) is less than $250 million for a period of 60 consecutive days and (iii) the date, if any, that is 60 days following the maturity, termination or repayment in full of the Extended Securitization Facility. Revolving loan borrowings under the New Inventory Facility bear interest at a per annum rate equal to, at the option of Arch Coal, either at the base rate or the London interbank offered rate plus, in each case, a margin ranging from 2.25% to 2.50% (in the case of LIBOR loans) and 1.25% to 1.50% (in the case of base rate loans) determined using a Liquidity-based grid. Letters of credit under the New Inventory Facility are subject to a fee in an amount equal to the applicable margin for LIBOR loans, plus customary fronting and issuance fees. All existing and future direct and indirect domestic subsidiaries of Arch Coal, subject to customary exceptions, will either constitute co-borrowers under or guarantors of the New Inventory Facility (collectively with Arch Coal, the “Loan Parties”). The New Inventory Facility is secured by first priority security interests in the ABL Priority Collateral (defined in the New Inventory Facility) of the Loan Parties and second priority security interests in substantially all other assets of the Loan Parties, subject to customary exceptions (including an exception for the collateral that secures the Extended Securitization Facility). Arch Coal has the right to prepay borrowings under the New Inventory Facility at any time and from time to time in whole or in part without premium or penalty, upon written notice, except that any prepayment of such borrowings that bear interest at the LIBOR rate other than at the end of the applicable interest periods therefore shall be made with reimbursement for any funding losses and redeployment costs of the Lender resulting therefrom. The New Inventory Facility is subject to certain usual and customary mandatory prepayment events, including non-ordinary course asset sales or dispositions, subject to customary thresholds, exceptions (including exceptions for required prepayments under Arch Coal’s term loan facility) and reinvestment rights. The New Inventory Facility contains certain customary affirmative and negative covenants; events of default, subject to customary thresholds and exceptions; and representations, including certain cash management and reporting requirements that are customary for asset-based credit facilities. The New Inventory Facility also includes a requirement to maintain Liquidity equal to or exceeding $175 million at all times. As of June 30, 2017 , letters of credit totaling $21.2 million were outstanding under the facility. Accounts Receivable Securitization Facility On April 27, 2017, the Company extended and amended its existing trade accounts receivable securitization facility provided to Arch Receivable Company, LLC, a special-purpose entity that is a wholly owned subsidiary of Arch Coal (“Arch Receivable”) (the “Extended Securitization Facility”), which supports the issuance of letters of credit and requests for cash advances. The amendment to the Extended Securitization Facility decreases the borrowing capacity from $200 million to $160 million and extends the maturity date to the date that is three years after the Securitization Facility Closing Date. Pursuant to the Extended Securitization Facility, Arch Receivable also agreed to a revised schedule of fees payable to the administrator and the providers of the Extended Securitization Facility. The Extended Securitization Facility will terminate at the earliest of (i) three years from the Securitization Facility Closing Date, (ii) if the Liquidity (defined in the Extended Securitization Facility and consistent with the definition in the New Inventory Facility) is less than $175 million for a period of 60 consecutive days, the date that is the 364th day after the first day of such 60 consecutive day period and (iii) the occurrence of certain predefined events substantially consistent with the existing transaction documents. Under the Extended Securitization Facility, Arch Receivable, Arch Coal and certain of Arch Coal’s subsidiaries party to the Extended Securitization Facility have granted to the administrator of the Extended Securitization Facility a first priority security interest in eligible trade accounts receivable generated by such parties from the sale of coal and all proceeds thereof. As of June 30, 2017 , letters of credit totaling $130.4 million were outstanding under the facility which had a borrowing base of $88.7 million . As a result, cash collateral of $41.7 million has been placed in the facility and there is no availability for borrowings. Interest Rate Swaps During the second quarter of 2017 , the Company entered into a series of interest rate swaps to fix a portion of the LIBOR interest rate within the term loan. The interest rate swaps qualify for cash flow hedge accounting treatment and as such, the change in the fair value of the interest rate swaps are recorded on the Company’s Condensed Consolidated Balance Sheet as an asset or liability with the effective portion of the gains or losses reported as a component of accumulated other comprehensive income and the ineffective portion reported in earnings. As interest payments are made on the term loan, amounts in accumulated other comprehensive income will be reclassified into earnings through interest expense to reflect a net interest on the term loan equal to the effective yield of the fixed rate of the swap plus 4% which is the spread on the LIBOR term loan. In the event that an interest rate swap is terminated prior to maturity, gains or losses in accumulated other comprehensive income will remain deferred and reclassified into earnings in the periods which the hedged forecasted transaction affects earnings. Below is a summary of the Company’s outstanding interest rate swap agreements designated as hedges as of June 30, 2017 : Notional Amount (in millions) Effective Date Fixed Rate Receive Rate Expiration Date $ 250.0 June 30, 2017 1.372 % 1-month LIBOR June 29, 2018 $ 250.0 June 29, 2018 1.662 % 1-month LIBOR June 28, 2019 $ 200.0 June 28, 2019 1.952 % 1-month LIBOR June 30, 2020 $ 100.0 June 30, 2020 2.182 % 1-month LIBOR June 30, 2021 The fair value of the interest rate swaps at June 30, 2017 is an asset of $0.2 million which is recorded within Other noncurrent assets with the offset to accumulated other comprehensive income on the Company’s Condensed Consolidated Balance Sheet. The interest rate swaps are classified as level 2 within the fair value hierarchy. Financing Costs The Company paid financing costs of $8.9 million during the six months ended June 30, 2017 ; $7.2 million of which related to the issuance of the New Term Loan Debt facility discussed above. These issuance costs were capitalized during the first quarter and will be amortized using the effective interest method over the term of the facility. An additional $1.7 million is related to the inventory-based revolving credit facility and accounts receivable securitization facility. These issuance costs will be amortized on a straight-line basis over the term of the facility. During the six months ended June 30, 2016 , the Company paid $18.8 million primarily related to the Superpriority Secured Debtor-in-Possession Credit Agreement related to the Company’s bankruptcy filing. The Company incurred $2.1 million of legal and financial advisory fees associated with debt refinancing activities during the six months ended June 30, 2017 ; $1.0 million relates to fees associated with the extinguishment of the “Previous First Lien Debt Facility” while the remaining amount relates to financing fees incurred from initial efforts to replace the existing accounts receivable securitization facility. The Company also incurred $2.2 million in debt restructuring costs during the six months ended June 30, 2016 related to debt restructuring activities prior to the Company’s Chapter 11 filing. Contractual Interest Expense During Bankruptcy Upon the filing of bankruptcy, the Company discontinued recording interest expense on unsecured debt that was classified as a liability subject to compromise. Contractual interest expense during the three and six months ended June 30, 2016 was $100.8 million and $199.3 million .

Income Taxes

Income Taxes	6 Months Ended
	Jun. 30, 2017
Income Tax Disclosure [Abstract]
Income Taxes	Income Taxes A reconciliation of the statutory federal income tax provision (benefit) at the statutory rate to the actual provision for (benefit from) income taxes follows: Successor Predecessor Successor Predecessor Three Months Ended June 30, 2017 Three Months Ended June 30, 2016 Six Months Ended June 30, 2017 Six Months Ended June 30, 2016 (In thousands) Income tax provision (benefit) at statutory rate $ 13,118 $ (61,645 ) $ 31,496 $ (134,380 ) Percentage depletion allowance (5,692 ) 5,909 (12,731 ) (19,758 ) State taxes, net of effect of federal taxes 408 (2,571 ) 891 (7,061 ) Change in valuation allowance (8,316 ) 58,665 (20,218 ) 159,227 Other, net 801 (603 ) 1,721 616 $ 319 $ (245 ) $ 1,159 $ (1,356 )

Fair Value Measurements

Fair Value Measurements	6 Months Ended
	Jun. 30, 2017
Fair Value Disclosures [Abstract]
Fair Value Measurements	Fair Value Measurements The hierarchy of fair value measurements assigns a level to fair value measurements based on the inputs used in the respective valuation techniques. The levels of the hierarchy, as defined below, give the highest priority to unadjusted quoted prices in active markets for identical assets or liabilities and the lowest priority to unobservable inputs. · Level 1 is defined as observable inputs such as quoted prices in active markets for identical assets. Level 1 assets include available-for-sale equity securities, U.S. Treasury securities, and coal futures that are submitted for clearing on the New York Mercantile Exchange. · Level 2 is defined as observable inputs other than Level 1 prices. These include quoted prices for similar assets or liabilities in an active market, quoted prices for identical assets and liabilities in markets that are not active, or other inputs that are observable or can be corroborated by observable market data for substantially the full term of the assets or liabilities. The Company’s level 2 assets and liabilities include U.S. government agency securities, interest rate swaps and commodity contracts (coal and heating oil) with fair values derived from quoted prices in over-the-counter markets or from prices received from direct broker quotes. · Level 3 is defined as unobservable inputs in which little or no market data exists, therefore requiring an entity to develop its own assumptions. These include the Company’s commodity option contracts (coal, natural gas and heating oil) valued using modeling techniques, such as Black-Scholes, that require the use of inputs, particularly volatility, that are rarely observable. Changes in the unobservable inputs would not have a significant impact on the reported Level 3 fair values at June 30, 2017 . The table below sets forth, by level, the Company’s financial assets and liabilities that are recorded at fair value in the accompanying condensed consolidated balance sheet: June 30, 2017 Total Level 1 Level 2 Level 3 (In thousands) Assets: Investments in marketable securities $ 159,822 $ 57,390 $ 102,432 $ — Derivatives 963 — 302 661 Total assets $ 160,785 $ 57,390 $ 102,734 $ 661 Liabilities: Derivatives $ 1,427 $ 1,434 $ 30 $ (37 ) The Company’s contracts with its counterparties allow for the settlement of contracts in an asset position with contracts in a liability position in the event of default or termination. For classification purposes, the Company records the net fair value of all the positions with these counterparties as a net asset or liability. Each level in the table above displays the underlying contracts according to their classification in the accompanying Condensed Consolidated Balance Sheet, based on this counterparty netting. The following table summarizes the change in the fair values of financial instruments categorized as Level 3. Three Months Ended June 30, 2017 Six Months Ended June 30, 2017 (In thousands) Balance, beginning of period $ 1,369 $ 4,537 Realized and unrealized gains recognized in earnings, net (1,332 ) (5,400 ) Purchases 1,158 2,553 Issuances (317 ) (499 ) Settlements (180 ) (493 ) Ending balance $ 698 $ 698 Net unrealized losses of $1.5 million and $1.3 million were recognized in the Condensed Consolidated Statement of Operations within Other operating income, net during the three and six months ended June 30, 2017 related to Level 3 financial instruments held on June 30, 2017 . Fair Value of Long-Term Debt At June 30, 2017 and December 31, 2016 , the fair value of the Company’s debt, including amounts classified as current, was $331.3 million and $362.9 million , respectively. Fair values are based upon observed prices in an active market, when available, or from valuation models using market information, which fall into Level 2 in the fair value hierarchy.

Earnings (loss) per common shar

Earnings (loss) per common share	6 Months Ended
	Jun. 30, 2017
Earnings Per Share [Abstract]
Earnings (loss) per common share	Earnings (loss) per Common Share The Company computes basic net income per share using the weighted average number of common shares outstanding during the period. Diluted net income per share is computed using the weighted average number of common shares and the effect of potentially dilutive securities outstanding during the period. Potentially dilutive securities may consist of warrants, restricted stock units or other contingently issuable shares. The dilutive effect of outstanding warrants, restricted stock units and other contingently issuable shares is reflected in diluted earnings per share by application of the treasury stock method. The following table provides the basis for basic and diluted earnings (loss) per share by reconciling the numerators and denominators of the computations: Successor Predecessor Successor Predecessor Three Months Ended June 30, 2017 Three Months Ended June 30, 2016 Six Months Ended June 30, 2017 Six Months Ended June 30, 2016 (In Thousands) Weighted average shares outstanding: Basic weighted average shares outstanding 24,659 21,293 24,834 21,293 Effect of dilutive securities 423 — 411 — Diluted weighted average shares outstanding 25,082 21,293 25,245 21,293

Workers' Compensation Expense

Workers' Compensation Expense	6 Months Ended
	Jun. 30, 2017
Compensation Related Costs [Abstract]
Workers' Compensation Expense	Workers Compensation Expense The Company is liable under the Federal Mine Safety and Health Act of 1969, as subsequently amended, to provide for pneumoconiosis (occupational disease) benefits to eligible employees, former employees and dependents. The Company currently provides for federal claims principally through a self-insurance program. The Company is also liable under various state workers’ compensation statutes for occupational disease benefits. The occupational disease benefit obligation represents the present value of the of the actuarially computed present and future liabilities for such benefits over the employees’ applicable years of service. In addition, the Company is liable for workers’ compensation benefits for traumatic injuries which are calculated using actuarially-based loss rates, loss development factors and discounted based on a risk free rate. Traumatic workers’ compensation claims are insured with varying retentions/deductibles, or through state-sponsored workers’ compensation programs. Workers’ compensation expense consists of the following components: Successor Predecessor Successor Predecessor Three Months Ended June 30, 2017 Three Months Ended June 30, 2016 Six Months Ended June 30, 2017 Six Months Ended June 30, 2016 (In thousands) Self-insured occupational disease benefits: Service cost $ 1,559 $ 1,310 $ 3,117 $ 2,415 Interest cost 1,168 1,029 2,337 2,086 Net amortization — 1,006 — 2,147 Curtailments $ — $ 4,156 $ — $ 4,156 Total occupational disease $ 2,727 $ 7,501 $ 5,454 $ 10,804 Traumatic injury claims and assessments 2,532 1,246 5,410 4,213 Total workers’ compensation expense $ 5,259 $ 8,747 $ 10,864 $ 15,017

Employee Benefit Plans

Employee Benefit Plans	6 Months Ended
	Jun. 30, 2017
Pension and Other Postretirement Benefits Cost (Reversal of Cost) [Abstract]
Employee Benefit Plans	Employee Benefit Plans The following table details the components of pension benefit costs (credits): Successor Predecessor Successor Predecessor Three Months Ended June 30, 2017 Three Months Ended June 30, 2016 Six Months Ended June 30, 2017 Six Months Ended June 30, 2016 (In thousands) Interest cost $ 2,991 $ 3,197 $ 5,982 $ 6,535 Expected return on plan assets (4,499 ) (4,444 ) (8,996 ) (8,982 ) Pension settlement (487 ) 454 (487 ) 454 Amortization of other actuarial losses — 924 — 1,681 Net benefit cost (credit) $ (1,995 ) $ 131 $ (3,501 ) $ (312 ) During the second quarter of 2017 the Company recorded a pension settlement related to its cash balance pension plan as the qualifying distributions from the plan exceeded the annual service and interest costs of the plan. Additionally, in accordance with accounting guidance, the Company revalued the cash balance pension liability which reduced the liability by approximately $3.6 million with the offset to accumulated other comprehensive income. The discount rate used for the revaluation was 3.59% . The following table details the components of other postretirement benefit costs (credits): Successor Predecessor Successor Predecessor Three Months Ended June 30, 2017 Three Months Ended June 30, 2016 Six Months Ended June 30, 2017 Six Months Ended June 30, 2016 (In thousands) Service cost $ 171 $ 105 $ 341 $ 265 Interest cost 1,059 1,138 2,117 2,272 Curtailments — (970 ) — (970 ) Amortization of prior service credits — (2,672 ) — (5,345 ) Amortization of other actuarial losses (gains) — (566 ) — (1,132 ) Net benefit cost (credit) $ 1,230 $ (2,965 ) $ 2,458 $ (4,910 )

Commitments and Contingencies

Commitments and Contingencies	6 Months Ended
	Jun. 30, 2017
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	Commitments and Contingencies The Company accrues for costs related to contingencies when a loss is probable and the amount is reasonably determinable. Disclosure of contingencies is included in the financial statements when it is at least reasonably possible that a material loss or an additional material loss in excess of amounts already accrued may be incurred. In addition, the Company is a party to numerous other claims and lawsuits with respect to various matters. As of June 30, 2017 and December 31, 2016 , the Company had accrued $0.2 million and $2.2 million , respectively, for all legal matters, of which all amounts are classified as current. The ultimate resolution of any such legal matter could result in outcomes which may be materially different from amounts the Company has accrued for such matters.

Segment Information

Segment Information	6 Months Ended
	Jun. 30, 2017
Segment Reporting [Abstract]
Segment Information	Segment Information The Company’s reportable business segments are based on two distinct lines of business, metallurgical and thermal, and may include a number of mine complexes. The Company manages its coal sales by market, not by individual mining complex. Geology, coal transportation routes to customers, and regulatory environments also have a significant impact on the Company’s marketing and operations management. Mining operations are evaluated based on Adjusted EBITDAR, per-ton cash operating costs (defined as including all mining costs except depreciation, depletion, amortization, accretion on asset retirement obligations, and pass-through transportation expenses), and on other non-financial measures, such as safety and environmental performance. Adjusted EBITDAR is not a measure of financial performance in accordance with generally accepted accounting principles, and items excluded from Adjusted EBITDAR are significant in understanding and assessing our financial condition. Therefore, Adjusted EBITDAR should not be considered in isolation, nor as an alternative to net income, income from operations, cash flows from operations or as a measure of our profitability, liquidity or performance under generally accepted accounting principles. The Company uses Adjusted EBITDAR to measure the operating performance of its segments and allocate resources to the segments. Furthermore, analogous measures are used by industry analysts and investors to evaluate the Company’s operating performance. Investors should be aware that the Company’s presentation of Adjusted EBITDAR may not be comparable to similarly titled measures used by other companies. The Company reports its results of operations primarily through the following reportable segments: Powder River Basin (PRB) segment containing the Company’s primary thermal operations in Wyoming; the Metallurgical (MET) segment, containing the Company’s metallurgical operations in West Virginia, Kentucky, and Virginia, and the Other Thermal segment containing the Company’s supplementary thermal operations in Colorado, Illinois, and West Virginia. Periods presented in this note have been recast for comparability. Operating segment results for the Successor period, the three and six months ended June 30, 2017 , and the Predecessor period, the three and six months ended June 30, 2016 , are presented below. The Company measures its segments based on “adjusted earnings before interest, taxes, depreciation, depletion, amortization, accretion on asset retirements obligations, and reorganization items, net (Adjusted EBITDAR).” Adjusted EBITDAR does not reflect mine closure or impairment costs, since those are not reflected in the operating income reviewed by management. See Note 5 , “ Asset Impairment and Mine Closure Costs ” for discussion of these costs. The Corporate, Other and Eliminations grouping includes these charges, as well as the change in fair value of coal derivatives and coal trading activities, net; corporate overhead; land management activities; other support functions; and the elimination of intercompany transactions. PRB MET Other Thermal Corporate, Other and Eliminations Consolidated Successor Periods (in thousands) Three Months Ended June 30, 2017 Revenues $ 230,579 $ 227,649 $ 91,639 $ (1 ) $ 549,866 Adjusted EBITDAR 31,789 62,552 26,910 (25,883 ) 95,368 Depreciation, depletion and amortization 8,574 18,385 3,285 457 30,701 Accretion on asset retirement obligation 5,040 528 540 1,515 7,623 Capital expenditures 822 6,825 1,899 1,426 10,972 Six Months Ended June 30, 2017 Revenues $ 504,007 $ 453,232 $ 193,545 $ 57 $ 1,150,841 Adjusted EBITDAR 79,794 130,862 54,152 (48,942 ) 215,866 Depreciation, depletion and amortization 18,085 37,149 6,485 903 62,622 Accretion on asset retirement obligation 10,080 1,057 1,080 3,029 15,246 Capital expenditures 950 11,436 2,640 1,896 16,922 Predecessor Periods Three Months Ended June 30, 2016 Revenues $ 207,735 $ 147,499 $ 60,032 $ 5,032 $ 420,298 Adjusted EBITDAR 21,578 (3,593 ) (408 ) (17,887 ) (310 ) Depreciation, depletion and amortization 30,145 17,330 9,907 1,077 58,459 Accretion on asset retirement obligation 5,647 588 663 1,152 8,050 Capital expenditures 489 6,726 949 60,047 68,211 Six Months Ended June 30, 2016 Revenues $ 430,857 $ 284,083 $ 116,164 $ 17,300 $ 848,404 Adjusted EBITDAR 34,306 2,759 2,743 (41,838 ) (2,030 ) Depreciation, depletion and amortization 62,905 36,675 19,798 2,780 122,158 Accretion on asset retirement obligation 11,293 1,177 1,325 2,561 16,356 Capital expenditures 499 10,330 2,895 60,413 74,137 A reconciliation of adjusted EBITDAR to consolidated loss before income taxes follows: Successor Predecessor Successor Predecessor Three Months Ended June 30, Three Months Ended June 30, Six Months Ended June 30, Six Months Ended June 30, 2017 2016 2017 2016 (In thousands) Adjusted EBITDAR $ 95,368 $ (310 ) $ 215,866 $ (2,030 ) Depreciation, depletion and amortization 30,701 58,459 62,622 122,158 Accretion on asset retirement obligations 7,623 8,050 15,246 16,356 Amortization of sales contracts, net 14,352 1 29,042 (832 ) Asset impairment and mine closure costs — 43,701 — 129,221 Interest expense, net (5,161 ) (44,340 ) (14,059 ) (87,653 ) Net loss resulting from early retirement of debt and debt restructuring (31 ) — (2,061 ) (2,213 ) Reorganization items, net (21 ) (21,271 ) (2,849 ) (25,146 ) Income (loss) before income taxes $ 37,479 $ (176,132 ) $ 89,987 $ (383,945 )

Subsequent Events

Subsequent Events	6 Months Ended
	Jun. 30, 2017
Subsequent Events [Abstract]
Subsequent Events	Subsequent Events On July 21, 2017, the Company entered into a definitive agreement to sell Lone Mountain Processing LLC, an operating mine complex within the Company’s metallurgical coal segment, and two idled mining companies, Cumberland River Coal LLC and Powell Mountain Energy LLC to Revelation Energy LLC. The purchase price is $8.3 million in cash, subject to customary adjustments for working capital and other items; the Company will retain certain workers’ compensation and employee-related obligations . The transaction is expected to close during the third quarter of 2017 and generate a net gain of approximately $15 - 20 million. The operations of Lone Mountain Processing LLC sold 0.7 million tons of coal in the first six months of 2017 while generating a pre-tax loss of $3.1 million.

Basis of Presentation (Policies

Basis of Presentation (Policies)	6 Months Ended
	Jun. 30, 2017
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Basis of Presentation	The accompanying unaudited condensed consolidated financial statements have been prepared in accordance with accounting principles generally accepted in the United States for interim financial reporting and U.S. Securities and Exchange Commission regulations. In the opinion of management, all adjustments, consisting of normal, recurring accruals considered necessary for a fair presentation, have been included. Results of operations for the three and six months ended June 30, 2017 are not necessarily indicative of results to be expected for the year ending December 31, 2017 . These financial statements should be read in conjunction with the audited financial statements and related notes as of and for the year ended December 31, 2016 included in the Company’s Annual Report on Form 10-K filed with the U.S. Securities and Exchange Commission. On January 11, 2016 (the “Petition Date”), Arch Coal and substantially all of its wholly owned domestic subsidiaries (the “Filing Subsidiaries” and, together with Arch Coal, the “Debtors”; the Debtors, solely following the effective date of the Plan, the “Reorganized Debtors”) filed voluntary petitions for reorganization (collectively, the “Bankruptcy Petitions”) under Chapter 11 of Title 11 of the U.S. Code (the “Bankruptcy Code”) in the United States Bankruptcy Court for the Eastern District of Missouri (the “Court”). The Debtors’ Chapter 11 Cases (collectively, the “Chapter 11 Cases”) were jointly administered under the caption In re Arch Coal, Inc., et al. Case No. 16-40120 (lead case). During the Chapter 11 Cases, each Debtor operated its business as a “debtor in possession” under the jurisdiction of the Court and in accordance with the applicable provisions of the Bankruptcy Code and the orders of the Court. Upon emergence from bankruptcy on October 5, 2016, Arch Coal applied the provisions of fresh start accounting effective October 1, 2016 which resulted in Arch becoming a new entity for financial reporting purposes. Accordingly, the consolidated financial statements and accompanying footnotes on or after October 1, 2016 are not comparable to the consolidated financial statements prior to that date. References to “Successor” in the consolidated financial statements and footnotes are in reference to reporting dates on or after October 2, 2016; references to “Predecessor” in the consolidated financial statements and footnotes are in reference to reporting dates through October 1, 2016 which includes the impact of the Plan provisions and the application of fresh start accounting.
Recent Adopted Accounting Guidance and Recent Accounting Guidance Issued Not Yet Effective	Recently Adopted Accounting Guidance In March 2016, the FASB issued Accounting Standards Update No. 2016-09, Compensation – Stock Compensation (Topic 718) ("ASU 2016-09"). ASU 2016-09 identifies areas for simplification involving several aspects of accounting for share-based payment transactions, including the income tax consequences, classification of awards as either equity or liabilities, an option to recognize gross stock compensation expense with actual forfeitures recognized as they occur, as well as certain classifications on the statement of cash flows. The Company adopted all provisions of this new accounting standard in the first quarter of 2017 and changed its forfeiture policy to recognize the impact of forfeitures when they occur from estimating expected forfeitures in determining stock-based compensation expense. There was no material impact to the Company's financial statements. Recent Accounting Guidance Issued Not Yet Effective In May 2014, the FASB issued ASU No. 2014-09, “Revenue from Contracts with Customers.” ASU 2014-09 is a comprehensive revenue recognition standard that will supersede nearly all existing revenue recognition guidance under current U.S. GAAP and replace it with a principle based approach for determining revenue recognition. ASU 2014-09 will require that companies recognize revenue based on the value of transferred goods or services as they occur in the contract. The ASU also will require additional disclosure about the nature, amount, timing and uncertainty of revenue and cash flows arising from customer contracts, including significant judgments and changes in judgments and assets recognized from costs incurred to obtain or fulfill a contract. ASU 2014-09 is effective for interim and annual periods beginning after December 15, 2017. Early adoption is permitted only in annual reporting periods beginning after December 15, 2016, including interim periods therein. Entities will be able to transition to the standard either retrospectively or as a cumulative-effect adjustment as of the date of adoption. The Company’s primary source of revenue is from the sale of coal through both short-term and long-term contracts with utilities, industrial customers and steel producers whereby revenue is currently recognized when risk of loss has passed to the customer. Upon adoption of this new standard, the Company believes that the timing of revenue recognition related to its coal sales will remain consistent with its current practice. The Company is in the process of reviewing its portfolio of coal sales contracts and the various terms and clauses within each contract. Additionally, the Company is evaluating other revenue streams to determine the potential impact related to the adoption of the standard, as well as potential disclosures required by the standard. The Company will be adopting the standard under the modified retrospective approach. In March 2017, the FASB issued ASU 2017-07, Compensation-Retirement Benefits (Topic 715) Improving the Presentation of Net Periodic Pension Cost and Net Periodic Postretirement Benefit Cost. ASU 2017-07 changes the income statement presentation of defined benefit plan expense by requiring separation between operating expense (service cost component) and non-operating expense (all other components, including interest cost, amortization of prior service cost, curtailments and settlements, etc.). The operating expense component is reported with similar compensation costs while the non-operating components are reported in Nonoperating expense. In addition, only the service cost component is eligible for capitalization as part of an asset such as inventory or property, plant and equipment. The Company is currently assessing the impact that adopting this new accounting standard will have on its consolidated financial statements. The ASU is effective for public companies for fiscal years beginning after December 15, 2017, and interim periods therein; early adoption is permitted.

Accumulated Other Comprehensi27

Accumulated Other Comprehensive Income (Tables)	6 Months Ended
	Jun. 30, 2017
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]
Schedule of Accumulated Other Comprehensive Income (Loss)	The following items are included in accumulated other comprehensive income ("AOCI"): Pension, Postretirement and Other Accumulated Post- Other Derivative Employment Available-for- Comprehensive Instruments Benefits Sale Securities Income (In thousands) Balance at December 31, 2016 $ — $ 24,067 $ 387 $ 24,454 Unrealized gains (losses) 276 3,641 (55 ) 3,862 Amounts reclassified from AOCI — (487 ) (332 ) (819 ) Balance at June 30, 2017 $ 276 $ 27,221 $ — $ 27,497
Schedule of Comprehensive Income Reclassifications	The following amounts were reclassified out of AOCI: Successor Predecessor Successor Predecessor Line Item in the Condensed Consolidated Statement of Operations Details About AOCI Components Three Months Ended June 30, 2017 Three Months Ended June 30, 2016 Six Months Ended June 30, 2017 Six Months Ended June 30, 2016 (In thousands) Derivative instruments $ — $ 96 $ — $ 321 Revenues — — — (81 ) Provision for (benefit from) income taxes $ — $ 96 $ — $ 240 Net of tax Pension, postretirement and other post-employment benefits Amortization of prior service credits $ — $ 2,672 $ — $ 5,344 Amortization of actuarial gains (losses), net — 77 — (1,257 ) Pension settlement 487 — 487 — 487 2,749 487 4,087 — — — (481 ) Provision for (benefit from) income taxes $ 487 $ 2,749 $ 487 $ 3,606 Net of tax Available-for-sale securities $ — $ — $ 332 $ (2,895 ) Interest and investment income — — — 1,038 Provision for (benefit from) income taxes $ — $ — $ 332 $ (1,857 ) Net of tax

Inventories (Tables)

Inventories (Tables)	6 Months Ended
	Jun. 30, 2017
Inventory Disclosure [Abstract]
Inventories	Inventories consist of the following: June 30, December 31, 2017 2016 (In thousands) Coal $ 60,887 $ 37,268 Repair parts and supplies 76,169 76,194 $ 137,056 $ 113,462

Investments in Available-for-29

Investments in Available-for-Sale Securities (Tables)	6 Months Ended
	Jun. 30, 2017
Available-for-sale Securities [Abstract]
Available-for-sale Securities	The Company’s investments in available-for-sale marketable securities are as follows: June 30, 2017 Balance Sheet Classification Gross Unrealized Fair Short-Term Other Cost Basis Gains Losses Value Investments Assets (In thousands) Available-for-sale: U.S. treasury securities $ 57,382 $ 32 $ (24 ) $ 57,390 $ 57,390 $ — Corporate notes and bonds 102,497 10 (75 ) 102,432 102,432 — Total Investments $ 159,879 $ 42 $ (99 ) $ 159,822 $ 159,822 $ — December 31, 2016 Balance Sheet Classification Gross Unrealized Fair Short-Term Other Cost Basis Gains Losses Value Investments Assets (In thousands) Available-for-sale: Corporate notes and bonds $ 88,161 $ — $ (89 ) $ 88,072 $ 88,072 $ — Equity securities 1,749 388 — 2,137 — 2,137 Total Investments $ 89,910 $ 388 $ (89 ) $ 90,209 $ 88,072 $ 2,137

Sales Contracts (Tables)

Sales Contracts (Tables)	6 Months Ended
	Jun. 30, 2017
Acquired Sales Contracts [Abstract]
Schedule of Sales Contracts	The sales contracts reflected in the consolidated balance sheets are as follows: June 30, 2017 December 31, 2016 Assets Liabilities Net Total Assets Liabilities Net Total (In thousands) (In thousands) Original fair value $ 97,196 $ 31,742 $ 97,196 $ 31,742 Accumulated amortization (59,408 ) (29,569 ) (25,625 ) (24,829 ) Total $ 37,788 $ 2,173 $ 35,615 $ 71,571 $ 6,913 $ 64,658 Balance Sheet classification: Other current $ 31,670 $ 827 $ 59,702 $ 5,114 Other noncurrent $ 6,118 $ 1,346 $ 11,869 $ 1,799

Derivatives (Tables)

Derivatives (Tables)	6 Months Ended
	Jun. 30, 2017
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Schedule of Price Risk Derivatives	At June 30, 2017 , the Company held derivatives for risk management purposes that are expected to settle in the following years: (Tons in thousands) 2017 2018 Total Coal sales 371 — 371 Coal purchases 363 — 363
Disclosure of Fair Value of Derivatives	The fair value and location of derivatives reflected in the accompanying Condensed Consolidated Balance Sheets are as follows: June 30, 2017 December 31, 2016 Fair Value of Derivatives Asset Liability Asset Liability (In thousands) Derivative Derivative Derivative Derivative Derivatives Designated as Hedging Instruments Coal $ 17 $ — $ — $ (15 ) Derivatives Not Designated as Hedging Instruments Heating oil -- diesel purchases 661 — 4,646 — Coal -- held for trading purposes 41,813 (43,157 ) 68,948 (68,740 ) Coal -- risk management 67 (146 ) 475 (580 ) Natural gas 103 (71 ) 86 (13 ) Total 42,644 (43,374 ) 74,155 (69,333 ) Total derivatives 42,661 (43,374 ) 74,155 (69,348 ) Effect of counterparty netting (41,947 ) 41,947 (69,247 ) 69,247 Net derivatives as classified in the balance sheets $ 714 $ (1,427 ) $ (713 ) $ 4,908 $ (101 ) $ 4,807 June 30, 2017 December 31, 2016 Net derivatives as reflected on the balance sheets (in thousands) Heating oil and coal Other current assets $ 714 $ 4,908 Coal Accrued expenses and other current liabilities (1,427 ) (101 ) $ (713 ) $ 4,807
Effects of Derivatives on Measures of Financial Performance	The effects of derivatives on measures of financial performance are as follows: Derivatives used in Cash Flow Hedging Relationships (in thousands) Three Months Ended June 30, Gain (Loss) Recognized in Other Comprehensive Income(Effective Portion) Gains (Losses) Reclassified from Other Comprehensive Income into Income (Effective Portion) Successor Predecessor Successor Predecessor 2017 2016 2017 2016 Coal sales (1) $ 49 $ (73 ) $ — $ 157 Coal purchases (2) (34 ) 6 — (61 ) Totals $ 15 $ (67 ) $ — $ 96 No ineffectiveness or amounts excluded from effectiveness testing relating to the Company’s cash flow hedging relationships were recognized in the results of operations in the three month periods ended June 30, 2017 and 2016 . Derivatives Not Designated as Hedging Instruments (in thousands) Three Months Ended June 30, Gain (Loss) Recognized Successor Predecessor 2017 2016 Coal — unrealized (3) $ — $ 19 Coal — realized (4) $ — $ (180 ) Natural gas — unrealized (3) $ (27 ) $ 235 Heating oil — diesel purchases (4) $ (1,147 ) $ 2,039 Foreign currency (4) $ — $ 34 ____________________________________________________________ Location in statement of operations: (1) — Revenues (2) — Cost of sales (3) — Change in fair value of coal derivatives and coal trading activities, net (4) — Other operating (income) expense, net Derivatives used in Cash Flow Hedging Relationships (in thousands) Six Months Ended June 30, Gain (Loss) Recognized in Other Comprehensive Income(Effective Portion) Gains (Losses) Reclassified from Other Comprehensive Income into Income Successor Predecessor Successor Predecessor 2017 2016 2017 2016 Coal sales (1) $ 269 $ (60 ) $ — $ 1,526 Coal purchases (2) (234 ) (5 ) — (1,205 ) Totals $ 35 $ (65 ) $ — $ 321 No ineffectiveness or amounts excluded from effectiveness testing relating to the Company’s cash flow hedging relationships were recognized in the results of operations in the six month periods ended June 30, 2017 and 2016 . Derivatives Not Designated as Hedging Instruments (in thousands) Six Months Ended June 30, Gain (Loss) Recognized Successor Predecessor 2017 2016 Coal — unrealized (3) $ 26 $ (1,096 ) Coal — realized (4) $ — $ (343 ) Natural gas — unrealized (3) $ (496 ) $ (384 ) Heating oil — diesel purchases (4) $ (4,725 ) $ 1,596 Foreign currency (4) $ — $ (137 ) ____________________________________________________________ Location in statement of operations: (1) — Revenues (2) — Cost of sales (3) — Change in fair value of coal derivatives and coal trading activities, net (4) — Other operating (income) expense, net

Accrued Expenses and Other Cu32

Accrued Expenses and Other Current Liabilities (Tables)	6 Months Ended
	Jun. 30, 2017
Payables and Accruals [Abstract]
Schedule of Accrued Liabilities	Accrued expenses and other current liabilities consist of the following: June 30, December 31, 2017 2016 (In thousands) Payroll and employee benefits $ 51,400 $ 58,468 Taxes other than income taxes 78,132 92,733 Interest 130 8,032 Acquired sales contracts 827 5,114 Workers’ compensation 15,926 15,184 Asset retirement obligations 17,817 19,515 Other 5,301 6,194 $ 169,533 $ 205,240

Debt and Financing Arrangemen33

Debt and Financing Arrangements (Tables)	6 Months Ended
	Jun. 30, 2017
Debt Disclosure [Abstract]
Debt	June 30, December 31, 2017 2016 (In thousands) Term loan due 2024 ($299.3 million face value) $ 297,808 $ — Term loan due 2021 ($325.7 million face value) — 325,684 Other 32,065 37,195 Debt issuance costs (6,820 ) — 323,053 362,879 Less: current maturities of debt 7,414 11,038 Long-term debt $ 315,639 $ 351,841
Schedule of Interest Rate Derivatives	Below is a summary of the Company’s outstanding interest rate swap agreements designated as hedges as of June 30, 2017 : Notional Amount (in millions) Effective Date Fixed Rate Receive Rate Expiration Date $ 250.0 June 30, 2017 1.372 % 1-month LIBOR June 29, 2018 $ 250.0 June 29, 2018 1.662 % 1-month LIBOR June 28, 2019 $ 200.0 June 28, 2019 1.952 % 1-month LIBOR June 30, 2020 $ 100.0 June 30, 2020 2.182 % 1-month LIBOR June 30, 2021

Income Taxes (Tables)

Income Taxes (Tables)	6 Months Ended
	Jun. 30, 2017
Income Tax Disclosure [Abstract]
Schedule of Components of Income Tax Expense (Benefit)	A reconciliation of the statutory federal income tax provision (benefit) at the statutory rate to the actual provision for (benefit from) income taxes follows: Successor Predecessor Successor Predecessor Three Months Ended June 30, 2017 Three Months Ended June 30, 2016 Six Months Ended June 30, 2017 Six Months Ended June 30, 2016 (In thousands) Income tax provision (benefit) at statutory rate $ 13,118 $ (61,645 ) $ 31,496 $ (134,380 ) Percentage depletion allowance (5,692 ) 5,909 (12,731 ) (19,758 ) State taxes, net of effect of federal taxes 408 (2,571 ) 891 (7,061 ) Change in valuation allowance (8,316 ) 58,665 (20,218 ) 159,227 Other, net 801 (603 ) 1,721 616 $ 319 $ (245 ) $ 1,159 $ (1,356 )

Fair Value Measurements (Tables

Fair Value Measurements (Tables)	6 Months Ended
	Jun. 30, 2017
Fair Value Disclosures [Abstract]
Summary of Financial Assets and Liabilities Accounted for at Fair Value	The table below sets forth, by level, the Company’s financial assets and liabilities that are recorded at fair value in the accompanying condensed consolidated balance sheet: June 30, 2017 Total Level 1 Level 2 Level 3 (In thousands) Assets: Investments in marketable securities $ 159,822 $ 57,390 $ 102,432 $ — Derivatives 963 — 302 661 Total assets $ 160,785 $ 57,390 $ 102,734 $ 661 Liabilities: Derivatives $ 1,427 $ 1,434 $ 30 $ (37 )
Summary of Change in the Fair Values of Financial Instruments Categorized as Level 3	The following table summarizes the change in the fair values of financial instruments categorized as Level 3. Three Months Ended June 30, 2017 Six Months Ended June 30, 2017 (In thousands) Balance, beginning of period $ 1,369 $ 4,537 Realized and unrealized gains recognized in earnings, net (1,332 ) (5,400 ) Purchases 1,158 2,553 Issuances (317 ) (499 ) Settlements (180 ) (493 ) Ending balance $ 698 $ 698

Earnings (loss) per common sh36

Earnings (loss) per common share (Tables)	6 Months Ended
	Jun. 30, 2017
Earnings Per Share [Abstract]
Schedule of Weighted Average Number of Shares	The following table provides the basis for basic and diluted earnings (loss) per share by reconciling the numerators and denominators of the computations: Successor Predecessor Successor Predecessor Three Months Ended June 30, 2017 Three Months Ended June 30, 2016 Six Months Ended June 30, 2017 Six Months Ended June 30, 2016 (In Thousands) Weighted average shares outstanding: Basic weighted average shares outstanding 24,659 21,293 24,834 21,293 Effect of dilutive securities 423 — 411 — Diluted weighted average shares outstanding 25,082 21,293 25,245 21,293

Workers' Compensation Expense (

Workers' Compensation Expense (Tables)	6 Months Ended
	Jun. 30, 2017
Compensation Related Costs [Abstract]
Workers' compensation expense	Workers’ compensation expense consists of the following components: Successor Predecessor Successor Predecessor Three Months Ended June 30, 2017 Three Months Ended June 30, 2016 Six Months Ended June 30, 2017 Six Months Ended June 30, 2016 (In thousands) Self-insured occupational disease benefits: Service cost $ 1,559 $ 1,310 $ 3,117 $ 2,415 Interest cost 1,168 1,029 2,337 2,086 Net amortization — 1,006 — 2,147 Curtailments $ — $ 4,156 $ — $ 4,156 Total occupational disease $ 2,727 $ 7,501 $ 5,454 $ 10,804 Traumatic injury claims and assessments 2,532 1,246 5,410 4,213 Total workers’ compensation expense $ 5,259 $ 8,747 $ 10,864 $ 15,017

Employee Benefit Plans (Tables)

Employee Benefit Plans (Tables)	6 Months Ended
	Jun. 30, 2017
Pension and Other Postretirement Benefits Cost (Reversal of Cost) [Abstract]
Pension Benefit Costs	The following table details the components of pension benefit costs (credits): Successor Predecessor Successor Predecessor Three Months Ended June 30, 2017 Three Months Ended June 30, 2016 Six Months Ended June 30, 2017 Six Months Ended June 30, 2016 (In thousands) Interest cost $ 2,991 $ 3,197 $ 5,982 $ 6,535 Expected return on plan assets (4,499 ) (4,444 ) (8,996 ) (8,982 ) Pension settlement (487 ) 454 (487 ) 454 Amortization of other actuarial losses — 924 — 1,681 Net benefit cost (credit) $ (1,995 ) $ 131 $ (3,501 ) $ (312 ) The following table details the components of other postretirement benefit costs (credits): Successor Predecessor Successor Predecessor Three Months Ended June 30, 2017 Three Months Ended June 30, 2016 Six Months Ended June 30, 2017 Six Months Ended June 30, 2016 (In thousands) Service cost $ 171 $ 105 $ 341 $ 265 Interest cost 1,059 1,138 2,117 2,272 Curtailments — (970 ) — (970 ) Amortization of prior service credits — (2,672 ) — (5,345 ) Amortization of other actuarial losses (gains) — (566 ) — (1,132 ) Net benefit cost (credit) $ 1,230 $ (2,965 ) $ 2,458 $ (4,910 )

Segment Information (Tables)

Segment Information (Tables)	6 Months Ended
	Jun. 30, 2017
Segment Reporting [Abstract]
Schedule of Operating Segment Results	The Corporate, Other and Eliminations grouping includes these charges, as well as the change in fair value of coal derivatives and coal trading activities, net; corporate overhead; land management activities; other support functions; and the elimination of intercompany transactions. PRB MET Other Thermal Corporate, Other and Eliminations Consolidated Successor Periods (in thousands) Three Months Ended June 30, 2017 Revenues $ 230,579 $ 227,649 $ 91,639 $ (1 ) $ 549,866 Adjusted EBITDAR 31,789 62,552 26,910 (25,883 ) 95,368 Depreciation, depletion and amortization 8,574 18,385 3,285 457 30,701 Accretion on asset retirement obligation 5,040 528 540 1,515 7,623 Capital expenditures 822 6,825 1,899 1,426 10,972 Six Months Ended June 30, 2017 Revenues $ 504,007 $ 453,232 $ 193,545 $ 57 $ 1,150,841 Adjusted EBITDAR 79,794 130,862 54,152 (48,942 ) 215,866 Depreciation, depletion and amortization 18,085 37,149 6,485 903 62,622 Accretion on asset retirement obligation 10,080 1,057 1,080 3,029 15,246 Capital expenditures 950 11,436 2,640 1,896 16,922 Predecessor Periods Three Months Ended June 30, 2016 Revenues $ 207,735 $ 147,499 $ 60,032 $ 5,032 $ 420,298 Adjusted EBITDAR 21,578 (3,593 ) (408 ) (17,887 ) (310 ) Depreciation, depletion and amortization 30,145 17,330 9,907 1,077 58,459 Accretion on asset retirement obligation 5,647 588 663 1,152 8,050 Capital expenditures 489 6,726 949 60,047 68,211 Six Months Ended June 30, 2016 Revenues $ 430,857 $ 284,083 $ 116,164 $ 17,300 $ 848,404 Adjusted EBITDAR 34,306 2,759 2,743 (41,838 ) (2,030 ) Depreciation, depletion and amortization 62,905 36,675 19,798 2,780 122,158 Accretion on asset retirement obligation 11,293 1,177 1,325 2,561 16,356 Capital expenditures 499 10,330 2,895 60,413 74,137
Reconciliation Statement of Segment Income from Operations to Consolidated Income Before Income Taxes	A reconciliation of adjusted EBITDAR to consolidated loss before income taxes follows: Successor Predecessor Successor Predecessor Three Months Ended June 30, Three Months Ended June 30, Six Months Ended June 30, Six Months Ended June 30, 2017 2016 2017 2016 (In thousands) Adjusted EBITDAR $ 95,368 $ (310 ) $ 215,866 $ (2,030 ) Depreciation, depletion and amortization 30,701 58,459 62,622 122,158 Accretion on asset retirement obligations 7,623 8,050 15,246 16,356 Amortization of sales contracts, net 14,352 1 29,042 (832 ) Asset impairment and mine closure costs — 43,701 — 129,221 Interest expense, net (5,161 ) (44,340 ) (14,059 ) (87,653 ) Net loss resulting from early retirement of debt and debt restructuring (31 ) — (2,061 ) (2,213 ) Reorganization items, net (21 ) (21,271 ) (2,849 ) (25,146 ) Income (loss) before income taxes $ 37,479 $ (176,132 ) $ 89,987 $ (383,945 )

Accumulated Other Comprehensi40

Accumulated Other Comprehensive Income (Schedule of Accumulated Other Comprehensive Income (Loss)) (Details) $ in Thousands	6 Months Ended
	Jun. 30, 2017USD ($)
Derivative instruments
Accumulated Other Comprenhensive Income (Loss) [Roll Forward]
Beginning Balance	$ 0
Unrealized gains (losses)	276
Amounts reclassified from AOCI	0
Ending Balance	276
Pension, Postretirement and Other Postemployment Benefits
Accumulated Other Comprenhensive Income (Loss) [Roll Forward]
Beginning Balance	24,067
Unrealized gains (losses)	3,641
Amounts reclassified from AOCI	(487)
Ending Balance	27,221
Available-for-sale securities
Accumulated Other Comprenhensive Income (Loss) [Roll Forward]
Beginning Balance	387
Unrealized gains (losses)	(55)
Amounts reclassified from AOCI	(332)
Ending Balance	0
Accumulated Other Comprehensive Income
Accumulated Other Comprenhensive Income (Loss) [Roll Forward]
Beginning Balance	24,454
Unrealized gains (losses)	3,862
Amounts reclassified from AOCI	(819)
Ending Balance	$ 27,497

Accumulated Other Comprehensi41

Accumulated Other Comprehensive Income (Schedule of Reclassifications) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Derivative instruments
Accumulated Other Comprehensive Income (Loss) [Line Items]
Net of tax			$ 0
Pension, Postretirement and Other Postemployment Benefits
Accumulated Other Comprehensive Income (Loss) [Line Items]
Net of tax			487
Available-for-sale securities
Accumulated Other Comprehensive Income (Loss) [Line Items]
Net of tax			332
Successor
Accumulated Other Comprehensive Income (Loss) [Line Items]
Revenues	$ 549,866		1,150,841
Provision for (benefit from) income taxes	(319)		(1,159)
Net income (loss)	37,160		88,828
Successor | Amortization of prior service credits
Accumulated Other Comprehensive Income (Loss) [Line Items]
Reclassification from AOCI before tax	0		0
Successor | Amortization of actuarial gains (losses), net
Accumulated Other Comprehensive Income (Loss) [Line Items]
Reclassification from AOCI before tax	0		0
Successor | Pension settlement
Accumulated Other Comprehensive Income (Loss) [Line Items]
Reclassification from AOCI before tax	487		487
Successor | Pension, Postretirement and Other Postemployment Benefits
Accumulated Other Comprehensive Income (Loss) [Line Items]
Reclassification from AOCI before tax	487		487
Provision for (benefit from) income taxes	0		0
Net of tax	487		487
Successor | Reclassification out of Accumulated Other Comprehensive Income | Derivative instruments
Accumulated Other Comprehensive Income (Loss) [Line Items]
Revenues	0		0
Provision for (benefit from) income taxes	0		0
Net income (loss)	0		0
Successor | Reclassification out of Accumulated Other Comprehensive Income | Available-for-sale securities
Accumulated Other Comprehensive Income (Loss) [Line Items]
Provision for (benefit from) income taxes	0		0
Net income (loss)	0		332
Interest and investment income	$ 0		$ 332
Predecessor
Accumulated Other Comprehensive Income (Loss) [Line Items]
Revenues		$ 420,298		$ 848,404
Provision for (benefit from) income taxes		245		1,356
Net income (loss)		(175,887)		(382,589)
Predecessor | Amortization of prior service credits
Accumulated Other Comprehensive Income (Loss) [Line Items]
Reclassification from AOCI before tax		2,672		5,344
Predecessor | Amortization of actuarial gains (losses), net
Accumulated Other Comprehensive Income (Loss) [Line Items]
Reclassification from AOCI before tax		77		(1,257)
Predecessor | Pension settlement
Accumulated Other Comprehensive Income (Loss) [Line Items]
Reclassification from AOCI before tax				0
Predecessor | Pension, Postretirement and Other Postemployment Benefits
Accumulated Other Comprehensive Income (Loss) [Line Items]
Reclassification from AOCI before tax		2,749		4,087
Provision for (benefit from) income taxes		0		(481)
Net of tax		2,749		3,606
Predecessor | Reclassification out of Accumulated Other Comprehensive Income | Derivative instruments
Accumulated Other Comprehensive Income (Loss) [Line Items]
Revenues		96		321
Provision for (benefit from) income taxes		0		(81)
Net income (loss)		96		240
Predecessor | Reclassification out of Accumulated Other Comprehensive Income | Available-for-sale securities
Accumulated Other Comprehensive Income (Loss) [Line Items]
Provision for (benefit from) income taxes		0		1,038
Net income (loss)		0		(1,857)
Interest and investment income		$ 0		$ (2,895)

Reorganization items, net (Narr

Reorganization items, net (Narrative) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Successor
Fresh-Start Adjustment [Line Items]
Reorganization items, net	$ (21)		$ (2,849)
Payments for reorganization items	$ 900		$ 4,700
Predecessor
Fresh-Start Adjustment [Line Items]
Reorganization items, net		$ (21,271)		$ (25,146)
Payments for reorganization items		$ 13,600		15,100
Professional fee expense				40,000
Non-cash gains on rejected contracts				$ 14,900

Asset Impairments and Mine Cl43

Asset Impairments and Mine Closure Costs (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Mar. 31, 2016	Jun. 30, 2016
Restructuring Cost and Reserve [Line Items]
Asset impairment and mine closure costs	$ 43.7	$ 85.5
Curtailments			$ 3.6
Severance expense	2.1
Impairment charge on investment		2.9
Royalty Agreements
Restructuring Cost and Reserve [Line Items]
Impairment charge		3.4
Longview, Washington
Restructuring Cost and Reserve [Line Items]
Impairment charge on investment	$ 38
Kentucky
Restructuring Cost and Reserve [Line Items]
Severance expense		5.1
Impaired coal reserves and surface land		$ 74.1

Inventories (Details)

Inventories (Details) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Inventory Disclosure [Abstract]
Coal	$ 60,887	$ 37,268
Repair parts and supplies	76,169	76,194
Inventories	137,056	113,462
Allowance for slow-moving and obsolete inventories	$ (100)	$ 0

Investments in Available-for-45

Investments in Available-for-Sale Securities (Details) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Schedule of Available-for-sale Securities [Line Items]
Debt Securities, Current	$ 159,822	$ 88,072
Total Investments, Cost Basis	159,879	89,910
Total Investments, Accumulated Gross Unrealized Gains	42	388
Total Investments, Accumulated Gross Unrealized Losses	(99)	(89)
Total Investments	159,822	90,209
Short-term Investments
Schedule of Available-for-sale Securities [Line Items]
Total Investments, Current	159,822	88,072
Other Assets
Schedule of Available-for-sale Securities [Line Items]
Total Investments, Noncurrent	0	2,137
U.S. treasury securities
Schedule of Available-for-sale Securities [Line Items]
Debt Securities, Cost Basis	57,382
Debt Securities, Accumulated Gross Unrealized Gains	32
Debt Securities, Accumulated Gross Unrealized Losses	(24)
Debt Securities	57,390
U.S. treasury securities | Short-term Investments
Schedule of Available-for-sale Securities [Line Items]
Debt Securities, Current	57,390
U.S. treasury securities | Other Assets
Schedule of Available-for-sale Securities [Line Items]
Debt Securities, Noncurrent	0
Corporate notes and bonds
Schedule of Available-for-sale Securities [Line Items]
Debt Securities, Cost Basis	102,497	88,161
Debt Securities, Accumulated Gross Unrealized Gains	10	0
Debt Securities, Accumulated Gross Unrealized Losses	(75)	(89)
Debt Securities	102,432	88,072
Corporate notes and bonds | Short-term Investments
Schedule of Available-for-sale Securities [Line Items]
Debt Securities, Current	102,432	88,072
Corporate notes and bonds | Other Assets
Schedule of Available-for-sale Securities [Line Items]
Debt Securities, Noncurrent	$ 0	0
Equity securities
Schedule of Available-for-sale Securities [Line Items]
Equity Securities, Cost Basis		1,749
Equity Securities, Accumulated Gross Unrealized Gains		388
Equity Securities, Accumulated Gross Unrealized Losses		0
Equity securities		2,137
Equity securities | Short-term Investments
Schedule of Available-for-sale Securities [Line Items]
Equity Securities, Current		0
Equity securities | Other Assets
Schedule of Available-for-sale Securities [Line Items]
Equity Securities, Noncurrent		$ 2,137

Investments in Available-for-46

Investments in Available-for-Sale Securities (Narrative) (Details) - USD ($) $ in Millions	Jun. 30, 2017	Dec. 31, 2016
Available-for-sale Securities [Abstract]
Unrealized losses owned for less than 12 months	$ 92	$ 47.6
Unrealized losses owned for greater than 12 months	$ 20.7	$ 40.4

Sales Contracts (Schedule of Sa

Sales Contracts (Schedule of Sales Contracts) (Details) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Acquired Finite-Lived Intangible Assets And Liabilities By Major Class [Line Items]
Acquired fair value, Assets	$ 97,196	$ 97,196
Acquired fair value, Liabilities	31,742	31,742
Accumulated amortization, Asset	(59,408)	(25,625)
Accumulated amortization, Liabilities	(29,569)	(24,829)
Total, Assets	37,788	71,571
Total, Liabilities	2,173	6,913
Net total, Liabilities	35,615	64,658
Coal Supply Agreement, Liabilities	827	5,114
Other current assets
Acquired Finite-Lived Intangible Assets And Liabilities By Major Class [Line Items]
Coal supply agreement, Assets	31,670	59,702
Other Current Liabilities
Acquired Finite-Lived Intangible Assets And Liabilities By Major Class [Line Items]
Coal Supply Agreement, Liabilities	827	5,114
Other Noncurrent Assets
Acquired Finite-Lived Intangible Assets And Liabilities By Major Class [Line Items]
Coal supply agreement, Assets	6,118	11,869
Other Noncurrent Liabilities
Acquired Finite-Lived Intangible Assets And Liabilities By Major Class [Line Items]
Coal Supply Agreement, Liabilities	$ 1,346	$ 1,799

Sales Contracts (Narrative) (De

Sales Contracts (Narrative) (Details) $ in Millions	Jun. 30, 2017USD ($)
Acquired Sales Contracts [Abstract]
2,017	$ 54.4
2,018	11.1
2,019	(0.6)
2,020	(0.1)
2,021	$ (0.1)

Derivatives (Narrative) (Detail

Derivatives (Narrative) (Details) gal in Millions, $ in Millions	3 Months Ended		6 Months Ended			12 Months Ended
	Jun. 30, 2017USD ($)gal$ / option	Jun. 30, 2016USD ($)	Dec. 31, 2017USD ($)	Jun. 30, 2017USD ($)gal$ / option	Jun. 30, 2016USD ($)	Dec. 31, 2018USD ($)	Dec. 31, 2016USD ($)
Derivative [Line Items]
Current liability for the obligation to return cash collateral | $	$ 4.6			$ 4.6			$ 2.8
Net unrealized and realized gains (losses) related to trading portfolio | $	$ (0.8)	$ (1)		$ (1.5)	$ (1)
Not Designated as Hedging Instrument | Heating Oil
Derivative [Line Items]
Percent of expected requirements covered	70.00%			70.00%
Derivative, average price risk option strike price (in usd per gallon) | $ / option	1.82			1.82
Not Designated as Hedging Instrument | Diesel Purchases
Derivative [Line Items]
Percent of expected requirements covered	25.00%			25.00%
Derivative, average price risk option strike price (in usd per gallon) | $ / option	1.81			1.81
Not Designated as Hedging Instrument | Diesel Purchases | Heating Oil
Derivative [Line Items]
Quantities under derivative contracts (in gallons) | gal	27			27
Not Designated as Hedging Instrument | Diesel Purchases | Minimum
Derivative [Line Items]
Gallons of diesel fuel purchased annually | gal				40
Not Designated as Hedging Instrument | Diesel Purchases | Maximum
Derivative [Line Items]
Gallons of diesel fuel purchased annually | gal				45
Scenario, Forecast
Derivative [Line Items]
Value of trading portfolio realized | $			$ (0.6)			$ (0.8)

Derivatives (Schedule of Price

Derivatives (Schedule of Price Risk Derivatives) (Details) T in Thousands	Jun. 30, 2017T
Coal sales
Derivative [Line Items]
Derivatives Held	371
Coal purchases
Derivative [Line Items]
Derivatives Held	363
2017 | Coal sales
Derivative [Line Items]
Derivatives Held	371
2017 | Coal purchases
Derivative [Line Items]
Derivatives Held	363
2018 | Coal sales
Derivative [Line Items]
Derivatives Held	0
2018 | Coal purchases
Derivative [Line Items]
Derivatives Held	0

Derivatives (Disclosure Of Fair

Derivatives (Disclosure Of Fair Value Of Derivatives) (Details) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Derivative [Line Items]
Derivative Assets	$ 42,661	$ 74,155
Derivative Liabilities	(43,374)	(69,348)
Effect of counterparty netting in derivative assets	(41,947)	(69,247)
Effect of counterparty netting in derivative liabilities	41,947	69,247
Derivative asset excluding interest rate swaps	714
Derivative Asset	963	4,908
Derivative Liability	(1,427)	(101)
Net derivatives as classified in the balance sheet	(713)	4,807
Designated as Hedging Instrument | Coal Contract
Derivative [Line Items]
Derivative Assets	17	0
Derivative Liabilities	0	(15)
Not Designated as Hedging Instrument
Derivative [Line Items]
Derivative Assets	42,644	74,155
Derivative Liabilities	(43,374)	(69,333)
Not Designated as Hedging Instrument | Coal Contract
Derivative [Line Items]
Derivative Assets	41,813	68,948
Derivative Liabilities	(43,157)	(68,740)
Not Designated as Hedging Instrument | Coal Contract
Derivative [Line Items]
Derivative Assets	67	475
Derivative Liabilities	(146)	(580)
Not Designated as Hedging Instrument | Heating oil — diesel purchases
Derivative [Line Items]
Derivative Assets	661	4,646
Derivative Liabilities	0	0
Not Designated as Hedging Instrument | Natural gas — unrealized
Derivative [Line Items]
Derivative Assets	103	86
Derivative Liabilities	$ (71)	$ (13)

Derivatives (Net Derivatives As

Derivatives (Net Derivatives As Reflected On The Balance Sheets) (Details) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Derivatives, Fair Value [Line Items]
Net derivatives as classified in the balance sheet	$ (713)	$ 4,807
Accrued expenses and other current liabilities
Derivatives, Fair Value [Line Items]
Net derivatives as classified in the balance sheet	(1,427)	(101)
Heating oil and coal | Other current assets
Derivatives, Fair Value [Line Items]
Net derivatives as classified in the balance sheet	$ 714	$ 4,908

Derivatives (Effects Of Derivat

Derivatives (Effects Of Derivatives On Measures Of Financial Performance) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Successor | Designated as Hedging Instrument
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) Recognized in Other Comprehensive Income(Effective Portion)	$ 15		$ 35
Gains (Losses) Reclassified from Other Comprehensive Income into Income (Effective Portion)	0		0
Successor | Designated as Hedging Instrument | Coal sales | Coal Contract | Revenues
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) Recognized in Other Comprehensive Income(Effective Portion)	49		269
Gains (Losses) Reclassified from Other Comprehensive Income into Income (Effective Portion)	0		0
Successor | Designated as Hedging Instrument | Coal purchases | Coal Contract | Cost of sales
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) Recognized in Other Comprehensive Income(Effective Portion)	(34)		(234)
Gains (Losses) Reclassified from Other Comprehensive Income into Income (Effective Portion)	0		0
Successor | Not Designated as Hedging Instrument | Coal Contract | Change in fair value of coal derivatives and coal trading activities, net
Derivative Instruments, Gain (Loss) [Line Items]
Unrealized Gain (Loss) on Derivatives	0		26
Successor | Not Designated as Hedging Instrument | Coal Contract | Other operating (income) expense, net
Derivative Instruments, Gain (Loss) [Line Items]
Realized Gain (Loss) on Derivatives	0		0
Successor | Not Designated as Hedging Instrument | Natural gas — unrealized | Change in fair value of coal derivatives and coal trading activities, net
Derivative Instruments, Gain (Loss) [Line Items]
Unrealized Gain (Loss) on Derivatives	(27)		(496)
Successor | Not Designated as Hedging Instrument | Heating oil — diesel purchases | Other operating (income) expense, net
Derivative Instruments, Gain (Loss) [Line Items]
Heating oil realized and unrealized gains and losses	(1,147)		(4,725)
Successor | Not Designated as Hedging Instrument | Foreign currency | Other operating (income) expense, net
Derivative Instruments, Gain (Loss) [Line Items]
Heating oil realized and unrealized gains and losses	$ 0		$ 0
Predecessor | Designated as Hedging Instrument
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) Recognized in Other Comprehensive Income(Effective Portion)		$ (67)		$ (65)
Gains (Losses) Reclassified from Other Comprehensive Income into Income (Effective Portion)		96		321
Predecessor | Designated as Hedging Instrument | Coal sales | Coal Contract | Revenues
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) Recognized in Other Comprehensive Income(Effective Portion)		(73)		(60)
Gains (Losses) Reclassified from Other Comprehensive Income into Income (Effective Portion)		157		1,526
Predecessor | Designated as Hedging Instrument | Coal purchases | Coal Contract | Cost of sales
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) Recognized in Other Comprehensive Income(Effective Portion)		6		(5)
Gains (Losses) Reclassified from Other Comprehensive Income into Income (Effective Portion)		(61)		(1,205)
Predecessor | Not Designated as Hedging Instrument | Coal Contract | Change in fair value of coal derivatives and coal trading activities, net
Derivative Instruments, Gain (Loss) [Line Items]
Unrealized Gain (Loss) on Derivatives		19		(1,096)
Predecessor | Not Designated as Hedging Instrument | Coal Contract | Other operating (income) expense, net
Derivative Instruments, Gain (Loss) [Line Items]
Realized Gain (Loss) on Derivatives		(180)		(343)
Predecessor | Not Designated as Hedging Instrument | Natural gas — unrealized | Change in fair value of coal derivatives and coal trading activities, net
Derivative Instruments, Gain (Loss) [Line Items]
Unrealized Gain (Loss) on Derivatives		235		(384)
Predecessor | Not Designated as Hedging Instrument | Heating oil — diesel purchases | Other operating (income) expense, net
Derivative Instruments, Gain (Loss) [Line Items]
Heating oil realized and unrealized gains and losses		2,039		1,596
Predecessor | Not Designated as Hedging Instrument | Foreign currency | Other operating (income) expense, net
Derivative Instruments, Gain (Loss) [Line Items]
Heating oil realized and unrealized gains and losses		$ 34		$ (137)

Accrued Expenses and Other Cu54

Accrued Expenses and Other Current Liabilities (Details) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Payables and Accruals [Abstract]
Payroll and employee benefits	$ 51,400	$ 58,468
Taxes other than income taxes	78,132	92,733
Interest	130	8,032
Acquired sales contracts	827	5,114
Workers’ compensation	15,926	15,184
Asset retirement obligations	17,817	19,515
Other	5,301	6,194
Accrued expenses and other current liabilities	$ 169,533	$ 205,240

Debt and Financing Arrangemen55

Debt and Financing Arrangements (Long term Debt) (Details) - USD ($)	Jun. 30, 2017	Dec. 31, 2016
Debt Instrument [Line Items]
Other	$ 32,065,000	$ 37,195,000
Debt issuance costs	(6,820,000)	0
Total	323,053,000	362,879,000
Less: current maturities of debt	7,414,000	11,038,000
Long-term debt	315,639,000	351,841,000
Term loan | Term loan due 2024 ($299.3 million face value)
Debt Instrument [Line Items]
Term loan	297,808,000	0
Debt instrument, face amount	299,300,000
Term loan | Term loan due 2021 ($325.7 million face value)
Debt Instrument [Line Items]
Term loan	$ 0	325,684,000
Debt instrument, face amount		$ 325,700,000

Debt and Financing Arrangemen56

Debt and Financing Arrangements (Narrative) (Details) - USD ($)	Apr. 27, 2017	Mar. 07, 2017	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016	Dec. 31, 2016
Line of Credit Facility [Line Items]
Net loss resulting from early retirement of debt and debt restructuring		$ 0
Fair value of derivative assets			$ 42,661,000		$ 42,661,000		$ 74,155,000
Debt restructuring costs					2,100,000	$ 2,200,000
Interest Rate Swap | Other Noncurrent Assets
Line of Credit Facility [Line Items]
Fair value of derivative assets			200,000		200,000
New Term Loan Debt Facility | Senior Notes
Line of Credit Facility [Line Items]
Net cash proceeds of from debt issuances and other non-ordinary sales or dispositions (percent)		100.00%
Default to indebtedness		$ 50,000,000
Default to surety, reclamation or similar bond		50,000,000
Default to uninsured judgment		50,000,000
Uninsured losses or proceedings against		50,000,000
Previous First Lien Debt Facility | Senior Notes
Line of Credit Facility [Line Items]
Debt restructuring costs					1,000,000
Successor
Line of Credit Facility [Line Items]
Net loss resulting from early retirement of debt and debt restructuring			(31,000)		(2,061,000)
Debt financing costs					8,900,000
Debt restructuring costs					2,061,000
Successor | New Term Loan Debt Facility | Senior Notes
Line of Credit Facility [Line Items]
Debt financing costs					7,200,000
Predecessor
Line of Credit Facility [Line Items]
Net loss resulting from early retirement of debt and debt restructuring				$ 0		(2,213,000)
Debt financing costs						18,806,000
Debt restructuring costs						2,213,000
Predecessor | Unsecured Debt
Line of Credit Facility [Line Items]
Interest expense, debt				$ 100,800,000		199,300,000
Predecessor | Superpriority Debtor-in Possession Credit Agreement | Line of Credit
Line of Credit Facility [Line Items]
Debt financing costs						$ 18,800,000
Line of Credit | Secured Debt
Line of Credit Facility [Line Items]
Letters of credit outstanding	$ 130,400,000
Current borrowing capacity			88,700,000		88,700,000
Cash collateral for borrowed securities	41,700,000
Line of Credit | Successor | Secured Debt
Line of Credit Facility [Line Items]
Debt financing costs					1,700,000
Line of Credit | Regions Bank | Secured Debt
Line of Credit Facility [Line Items]
Debt instrument, face amount	$ 40,000,000
Percentage of coal inventory borrowing base	85.00%
Percentage of parts and supplies inventory borrowing base	85.00%
Percentage of clause borrowing base	35.00%
Percent of eligible cash	100.00%
Covenant amount	$ 250,000,000
Covenant minimum amount	175,000,000
Letters of credit outstanding			21,200,000		21,200,000
Maximum borrowing capacity			$ 200,000,000		$ 200,000,000
Current borrowing capacity	$ 160,000,000
Line of Credit | Regions Bank | Minimum | Secured Debt | LIBOR
Line of Credit Facility [Line Items]
Basis spread on variable rate (percent)	2.25%
Line of Credit | Regions Bank | Minimum | Secured Debt | Base Rate
Line of Credit Facility [Line Items]
Basis spread on variable rate (percent)	1.25%
Line of Credit | Regions Bank | Maximum | Secured Debt | LIBOR
Line of Credit Facility [Line Items]
Percentage of clause borrowing base	2.50%
Line of Credit | Regions Bank | Maximum | Secured Debt | Base Rate
Line of Credit Facility [Line Items]
Basis spread on variable rate (percent)	1.50%
New Term Loan Debt Facility | Senior Notes
Line of Credit Facility [Line Items]
Debt instrument, face amount		$ 300,000,000
Percentage of face amount		99.50%
Quarterly amortization payments		$ 750,000
Amount of voting equity interests of domestic subsidiaries guaranteed (percent)		100.00%
Amount of voting equity interests of foreign owned subsidiaries guaranteed (percent)		65.00%
New Term Loan Debt Facility | Senior Notes | LIBOR
Line of Credit Facility [Line Items]
Basis spread on variable rate (percent)		4.00%	4.00%
New Term Loan Debt Facility | Senior Notes | Base Rate
Line of Credit Facility [Line Items]
Basis spread on variable rate (percent)		3.00%
New Term Loan Debt Facility | Minimum | Senior Notes | LIBOR
Line of Credit Facility [Line Items]
Basis spread on variable rate (percent)		1.00%

Debt and Financing Arrangemen57

Debt and Financing Arrangements (Interest rate derivatives) (Details) $ in Millions	Jun. 30, 2017USD ($)
Interest rate swap, effective 2017
Debt Instrument [Line Items]
Notional Amount	$ 250
Fixed Rate	1.372%
Interest rate swap, effective 2018
Debt Instrument [Line Items]
Notional Amount	$ 250
Fixed Rate	1.662%
Interest rate swap, effective 2019
Debt Instrument [Line Items]
Notional Amount	$ 200
Fixed Rate	1.952%
Interest rate swap, effective 2020
Debt Instrument [Line Items]
Notional Amount	$ 100
Fixed Rate	2.182%

Income Taxes (Income Tax Expens

Income Taxes (Income Tax Expense (Benefit)) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Successor
Income Tax Examination [Line Items]
Income tax provision (benefit) at statutory rate	$ 13,118		$ 31,496
Percentage depletion allowance	(5,692)		(12,731)
State taxes, net of effect of federal taxes	408		891
Change in valuation allowance	(8,316)		(20,218)
Other, net	801		1,721
Income Tax Expense (Benefit)	$ 319		$ 1,159
Predecessor
Income Tax Examination [Line Items]
Income tax provision (benefit) at statutory rate		$ (61,645)		$ (134,380)
Percentage depletion allowance		5,909		(19,758)
State taxes, net of effect of federal taxes		(2,571)		(7,061)
Change in valuation allowance		58,665		159,227
Other, net		(603)		616
Income Tax Expense (Benefit)		$ (245)		$ (1,356)

Fair Value Measurements (Narrat

Fair Value Measurements (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
	Jun. 30, 2017	Jun. 30, 2017	Dec. 31, 2016
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value of senior notes and other long-term debt, including amounts classified as current	$ 331.3	$ 331.3	$ 362.9
Level 3
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Net unrealized gains (losses) related to level 3 financial instruments	$ (1.5)	$ (1.3)

Fair Value Measurements (Summar

Fair Value Measurements (Summary Of Financial Assets And Liabilities Accounted For At Fair Value) (Details) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Assets:
Investments in marketable securities	$ 159,822	$ 90,209
Derivatives	963	4,908
Total assets	160,785
Liabilities:
Derivatives	1,427	$ 101
Level 1
Assets:
Investments in marketable securities	57,390
Derivatives	0
Total assets	57,390
Liabilities:
Derivatives	1,434
Level 2
Assets:
Investments in marketable securities	102,432
Derivatives	302
Total assets	102,734
Liabilities:
Derivatives	30
Level 3
Assets:
Investments in marketable securities	0
Derivatives	661
Total assets	661
Liabilities:
Derivatives	$ (37)

Fair Value Measurements (Summ61

Fair Value Measurements (Summary Of Change In The Fair Values Of Financial Instruments Categorized As Level 3) (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
	Jun. 30, 2017	Jun. 30, 2017
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance, beginning of period	$ 1,369	$ 4,537
Realized and unrealized gains recognized in earnings, net	(1,332)	(5,400)
Purchases	1,158	2,553
Issuances	(317)	(499)
Settlements	(180)	(493)
Ending balance	$ 698	$ 698

Earnings (loss) per common sh62

Earnings (loss) per common share (Weighted-Average Number of Shares) (Details) - shares shares in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Successor
Weighted average shares outstanding:
Basic weighted average shares outstanding (shares)	24,659		24,834
Effect of dilutive securities (shares)	423		411
Diluted weighted average shares outstanding (shares)	25,082		25,245
Predecessor
Weighted average shares outstanding:
Basic weighted average shares outstanding (shares)		21,293		21,293
Effect of dilutive securities (shares)		0		0
Diluted weighted average shares outstanding (shares)		21,293		21,293

Workers' Compensation Expense63

Workers' Compensation Expense (Worker's Compensation Expense) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Accrued Workers' Compensation [Line Items]
Curtailments				$ 3,600
Successor | Occupational disease
Accrued Workers' Compensation [Line Items]
Service cost	$ 1,559		$ 3,117
Interest cost	1,168		2,337
Net amortization	0		0
Curtailments	0		0
Net benefit cost (credit)	2,727		5,454
Successor | Traumatic injury claims and assessments
Accrued Workers' Compensation [Line Items]
Traumatic injury claims and assessments	2,532		5,410
Successor | Workers compensation
Accrued Workers' Compensation [Line Items]
Total workers’ compensation expense	$ 5,259		$ 10,864
Predecessor | Occupational disease
Accrued Workers' Compensation [Line Items]
Service cost		$ 1,310		2,415
Interest cost		1,029		2,086
Net amortization		1,006		2,147
Curtailments		4,156		4,156
Net benefit cost (credit)		7,501		10,804
Predecessor | Traumatic injury claims and assessments
Accrued Workers' Compensation [Line Items]
Traumatic injury claims and assessments		1,246		4,213
Predecessor | Workers compensation
Accrued Workers' Compensation [Line Items]
Total workers’ compensation expense		$ 8,747		$ 15,017

Employee Benefit Plans (Pension

Employee Benefit Plans (Pension And Other Postretirement Benefit Costs) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Successor | Defined benefit pension plan
Defined Benefit Plan Disclosure [Line Items]
Interest cost	$ 2,991		$ 5,982
Expected return on plan assets	(4,499)		(8,996)
Pension settlement	(487)		(487)
Amortization of other actuarial losses (gains)	0		0
Net benefit cost (credit)	(1,995)		(3,501)
Successor | Other Postretirement Benefits Plan
Defined Benefit Plan Disclosure [Line Items]
Service cost	171		341
Interest cost	1,059		2,117
Curtailments	0		0
Amortization of prior service credits	0		0
Amortization of other actuarial losses (gains)	0		0
Net benefit cost (credit)	$ 1,230		$ 2,458
Predecessor | Defined benefit pension plan
Defined Benefit Plan Disclosure [Line Items]
Interest cost		$ 3,197		$ 6,535
Expected return on plan assets		(4,444)		(8,982)
Pension settlement		454		454
Amortization of other actuarial losses (gains)		924		1,681
Net benefit cost (credit)		131		(312)
Predecessor | Other Postretirement Benefits Plan
Defined Benefit Plan Disclosure [Line Items]
Service cost		105		265
Interest cost		1,138		2,272
Curtailments		(970)		(970)
Amortization of prior service credits		(2,672)		(5,345)
Amortization of other actuarial losses (gains)		(566)		(1,132)
Net benefit cost (credit)		$ (2,965)		$ (4,910)

Employee Benefit Plans (Narrati

Employee Benefit Plans (Narrative) (Details) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Defined Benefit Plan Disclosure [Line Items]
Decrease in defined benefit plan obligation	$ 101,407	$ 101,445
Defined benefit pension plan
Defined Benefit Plan Disclosure [Line Items]
Revaluation discount rate	3.59%
Defined benefit pension plan | Change in assumptions for defined benefit plans
Defined Benefit Plan Disclosure [Line Items]
Decrease in defined benefit plan obligation	$ 3,600

Commitments and Contingencies (

Commitments and Contingencies (Narrative) (Details) - USD ($) $ in Millions	Jun. 30, 2017	Dec. 31, 2016
Commitments and Contingencies Disclosure [Abstract]
Amount accrued	$ 0.2	$ 2.2

Segment Information (Schedule O

Segment Information (Schedule Of Operating Segment Results) (Details) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017USD ($)	Jun. 30, 2016USD ($)	Jun. 30, 2017USD ($)Segment	Jun. 30, 2016USD ($)
Segment Reporting [Abstract]
Number of reportable segments | Segment			2
Successor
Segment Reporting Information [Line Items]
Revenues	$ 549,866		$ 1,150,841
Adjusted EBITDAR	95,368		215,866
Depreciation, depletion and amortization	30,701		62,622
Accretion on asset retirement obligations	7,623		15,246
Capital expenditures	10,972		16,922
Successor | Operating Segments | PRB
Segment Reporting Information [Line Items]
Revenues	230,579		504,007
Adjusted EBITDAR	31,789		79,794
Depreciation, depletion and amortization	8,574		18,085
Accretion on asset retirement obligations	5,040		10,080
Capital expenditures	822		950
Successor | Operating Segments | MET
Segment Reporting Information [Line Items]
Revenues	227,649		453,232
Adjusted EBITDAR	62,552		130,862
Depreciation, depletion and amortization	18,385		37,149
Accretion on asset retirement obligations	528		1,057
Capital expenditures	6,825		11,436
Successor | Operating Segments | Other Thermal
Segment Reporting Information [Line Items]
Revenues	91,639		193,545
Adjusted EBITDAR	26,910		54,152
Depreciation, depletion and amortization	3,285		6,485
Accretion on asset retirement obligations	540		1,080
Capital expenditures	1,899		2,640
Successor | Corporate, Other and Eliminations
Segment Reporting Information [Line Items]
Revenues	(1)		57
Adjusted EBITDAR	(25,883)		(48,942)
Depreciation, depletion and amortization	457		903
Accretion on asset retirement obligations	1,515		3,029
Capital expenditures	$ 1,426		$ 1,896
Predecessor
Segment Reporting Information [Line Items]
Revenues		$ 420,298		$ 848,404
Adjusted EBITDAR		(310)		(2,030)
Depreciation, depletion and amortization		58,459		122,158
Accretion on asset retirement obligations		8,050		16,356
Capital expenditures		68,211		74,137
Predecessor | Operating Segments | PRB
Segment Reporting Information [Line Items]
Revenues		207,735		430,857
Adjusted EBITDAR		21,578		34,306
Depreciation, depletion and amortization		30,145		62,905
Accretion on asset retirement obligations		5,647		11,293
Capital expenditures		489		499
Predecessor | Operating Segments | MET
Segment Reporting Information [Line Items]
Revenues		147,499		284,083
Adjusted EBITDAR		(3,593)		2,759
Depreciation, depletion and amortization		17,330		36,675
Accretion on asset retirement obligations		588		1,177
Capital expenditures		6,726		10,330
Predecessor | Operating Segments | Other Thermal
Segment Reporting Information [Line Items]
Revenues		60,032		116,164
Adjusted EBITDAR		(408)		2,743
Depreciation, depletion and amortization		9,907		19,798
Accretion on asset retirement obligations		663		1,325
Capital expenditures		949		2,895
Predecessor | Corporate, Other and Eliminations
Segment Reporting Information [Line Items]
Revenues		5,032		17,300
Adjusted EBITDAR		(17,887)		(41,838)
Depreciation, depletion and amortization		1,077		2,780
Accretion on asset retirement obligations		1,152		2,561
Capital expenditures		$ 60,047		$ 60,413

Segment Information (Reconcilia

Segment Information (Reconciliation Statement Of Segment Income from Operations To Consolidated Income Before Income Taxes) (Details) - USD ($)	Mar. 07, 2017	Jun. 30, 2017	Jun. 30, 2016	Mar. 31, 2016	Jun. 30, 2017	Jun. 30, 2016
Segment Reporting Information [Line Items]
Asset impairment and mine closure costs			$ 43,700,000	$ 85,500,000
Net loss resulting from early retirement of debt and debt restructuring	$ 0
Successor
Segment Reporting Information [Line Items]
Adjusted EBITDAR		$ 95,368,000			$ 215,866,000
Depreciation, depletion and amortization		30,701,000			62,622,000
Accretion on asset retirement obligations		7,623,000			15,246,000
Amortization of sales contracts, net		14,352,000			29,042,000
Asset impairment and mine closure costs		0			0
Interest expense, net		(5,161,000)			(14,059,000)
Net loss resulting from early retirement of debt and debt restructuring		(31,000)			(2,061,000)
Reorganization items, net		(21,000)			(2,849,000)
Income (loss) before income taxes		$ 37,479,000			$ 89,987,000
Predecessor
Segment Reporting Information [Line Items]
Adjusted EBITDAR			(310,000)			$ (2,030,000)
Depreciation, depletion and amortization			58,459,000			122,158,000
Accretion on asset retirement obligations			8,050,000			16,356,000
Amortization of sales contracts, net			1,000			(832,000)
Asset impairment and mine closure costs			43,701,000			129,221,000
Interest expense, net			(44,340,000)			(87,653,000)
Net loss resulting from early retirement of debt and debt restructuring			0			(2,213,000)
Reorganization items, net			(21,271,000)			(25,146,000)
Income (loss) before income taxes			$ (176,132,000)			$ (383,945,000)

Subsequent Events (Narrative) (

Subsequent Events (Narrative) (Details) T in Millions, $ in Millions	Jul. 21, 2017USD ($)	Jun. 30, 2017USD ($)T
Subsequent Event
Subsequent Event [Line Items]
Number of mining companies	2
Purchase price of entity	$ 8.3
Lone Mountain Processing LLC
Subsequent Event [Line Items]
Coal sold during period | T		0.7
Net income (loss) attributable to Lone Mountain Processing LLC		$ (3.1)
Minimum | Subsequent Event
Subsequent Event [Line Items]
Expected gain (loss) on sale of Lone Mountain Processing LLC	15
Maximum | Subsequent Event
Subsequent Event [Line Items]
Expected gain (loss) on sale of Lone Mountain Processing LLC	$ 20