WESTMORELAND COAL (WLBAQ) 10-Q 31 Oct 17 2017 Q3 Quarterly report Financial data

Document and Entity Information

Document and Entity Information - shares	9 Months Ended
	Sep. 30, 2017	Oct. 27, 2017
Document Documentand Entity Information [Abstract]
Entity Registrant Name	WESTMORELAND COAL Co
Entity Central Index Key	106,455
Document Type	10-Q
Document Period End Date	Sep. 30, 2017
Amendment Flag	false
Document Fiscal Year Focus	2,017
Document Fiscal Period Focus	Q3
Current Fiscal Year End Date	--12-31
Entity Filer Category	Accelerated Filer
Entity Common Stock, Shares Outstanding		18,744,151

Consolidated Balance Sheets (Un

Consolidated Balance Sheets (Unaudited) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Current assets:
Cash and cash equivalents	$ 44,143	$ 60,082
Receivables:
Trade	146,412	140,731
Loan and lease receivables	0	5,867
Other	12,522	13,261
Total receivables	158,934	159,859
Inventories	110,176	125,515
Other current assets	29,788	32,258
Total current assets	343,041	377,714
Property, plant and equipment:
Gross property, plant and equipment	1,670,632	1,617,938
Less accumulated depreciation, depletion and amortization	904,246	782,417
Net property, plant and equipment	766,386	835,521
Loan and lease receivables, less current portion	0	44,474
Advanced coal royalties	18,665	18,722
Restricted investments and bond collateral	224,349	219,275
Investment in joint venture	28,244	26,951
Other assets	53,827	62,252
Total Assets	1,434,512	1,584,909
Current liabilities:
Current installments of long-term debt	49,712	86,272
Accounts payable and accrued expenses:
Trade and other accrued liabilities	113,970	142,233
Interest payable	15,205	22,458
Production taxes	48,936	44,995
Postretirement medical benefits	14,892	14,892
Deferred revenue	16,248	15,253
Asset retirement obligations	44,841	32,207
Other current liabilities	26,354	20,964
Total current liabilities	330,158	379,274
Long-term debt, less current installments	1,021,436	1,022,794
Postretirement medical benefits, less current portion	310,183	308,709
Pension and SERP obligations, less current portion	42,624	43,982
Deferred revenue, less current portion	7,791	16,251
Asset retirement obligations, less current portion	451,862	451,834
Other liabilities	44,605	52,182
Total liabilities	2,208,659	2,275,026
Shareholders' deficit:
Common stock of $.01 par value: Authorized 30,000,000 shares; Issued and outstanding 18,742,143 at September 30, 2017 and 18,570,642 at December 31, 2016	187	186
Other paid-in capital	250,729	248,143
Accumulated other comprehensive loss	(157,799)	(179,072)
Accumulated deficit	(864,012)	(757,367)
Total Westmoreland Coal Company shareholders’ deficit	(770,895)	(688,110)
Noncontrolling interests in consolidated subsidiaries	(3,252)	(2,007)
Total deficit	(774,147)	(690,117)
Total Liabilities and Shareholders' Deficit	$ 1,434,512	$ 1,584,909

Consolidated Balance Sheets (Pa

Consolidated Balance Sheets (Parenthetical) - $ / shares	Sep. 30, 2017	Dec. 31, 2016
Statement of Financial Position [Abstract]
Common stock, par value	$ 0.01	$ 0.01
Common stock, shares authorized	30,000,000	30,000,000
Common stock, shares issued	18,742,143	18,570,642
Common stock, shares outstanding	18,742,143	18,570,642

Consolidated Statements of Oper

Consolidated Statements of Operations (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Income Statement [Abstract]
Revenues	$ 358,011	$ 371,772	$ 1,020,772	$ 1,085,223
Costs, expenses and other:
Cost of sales	280,012	285,428	836,525	864,735
Depreciation, depletion and amortization	38,066	40,860	114,131	113,097
Selling and administrative	28,115	25,655	88,706	80,667
Heritage health benefit expenses	3,349	3,265	9,953	9,502
Loss (gain) on sale/disposal of assets	236	548	202	(1,369)
Derivative (gain) loss	(4,667)	5,442	(6,571)	2,164
Income from equity affiliates	(1,355)	(1,547)	(4,274)	(4,127)
Other operating loss	0	3,368	0	5,065
Total costs, expenses and other	343,756	363,019	1,038,672	1,069,734
Operating income (loss)	14,255	8,753	(17,900)	15,489
Other (expense) income:
Interest expense	(30,017)	(30,882)	(89,388)	(90,669)
Interest income	1,012	1,374	2,942	5,521
(Loss) gain on foreign exchange	(1,739)	220	(3,391)	(1,531)
Other (loss) income	(3,251)	303	(793)	435
Total other income (expense)	(33,995)	(28,985)	(90,630)	(86,244)
Loss before income taxes	(19,740)	(20,232)	(108,530)	(70,755)
Income tax benefit	(440)	(1,625)	(1,406)	(49,660)
Net loss	(19,300)	(18,607)	(107,124)	(21,095)
Less net loss attributable to noncontrolling interest	(78)	(239)	(715)	(1,545)
Net loss applicable to common shareholders	$ (19,222)	$ (18,368)	$ (106,409)	$ (19,550)
Net loss per share applicable to common shareholders:
Basic and diluted (in dollars per share)	$ (1.03)	$ (0.99)	$ (5.70)	$ (1.06)
Weighted average number of common shares outstanding:
Basic and diluted (shares)	18,742	18,570	18,672	18,458

Consolidated Statements of Comp

Consolidated Statements of Comprehensive (Loss) Income (Unaudited) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Statement of Comprehensive Income [Abstract]
Net loss	$ (19,300)	$ (18,607)	$ (107,124)	$ (21,095)
Other comprehensive income (loss)
Amortization of accumulated actuarial losses, pension	588	1,294	1,765	3,639
Adjustments to accumulated actuarial gains (losses) and transition obligations, pension	(112)	813	189	786
Amortization of accumulated actuarial losses, transition obligations, and prior service costs, postretirement medical benefit	964	368	2,893	891
Adjustments to accumulated actuarial gains and transition obligations, postretirement medical benefit	0	0	0	984
Tax effect of other comprehensive income losses	(684)	(1,039)	(2,503)	(2,410)
Change in foreign currency translation adjustment	9,426	(2,432)	17,455	16,128
Unrealized and realized gains and losses on available-for-sale securities	278	535	1,474	255
Other comprehensive income (loss), net of income taxes	10,460	(461)	21,273	20,273
Comprehensive loss	(8,840)	(19,068)	(85,851)	(822)
Less: Comprehensive loss attributable to noncontrolling interest	(78)	(240)	(715)	(1,532)
Comprehensive (loss) income attributable to common shareholders	$ (8,762)	$ (18,828)	$ (85,136)	$ 710

Consolidated Statements of Cash

Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016
Cash flows from operating activities:
Net loss	$ (107,124)	$ (21,095)
Adjustments to reconcile net loss to net cash provided by operating activities:
Depreciation, depletion and amortization	114,131	113,097
Accretion of asset retirement obligation and receivable	33,796	30,229
Share-based compensation	3,846	5,925
Non-cash interest expense	6,981	6,879
Amortization of deferred financing costs	8,183	8,324
(Gain) loss on derivative instruments	(6,571)	2,164
Loss on foreign exchange	3,391	1,531
Income from equity affiliates	(4,274)	(4,127)
Distributions from equity affiliates	4,970	5,177
Deferred income tax benefit	(1,374)	(48,490)
Other	3,341	(9,217)
Changes in operating assets and liabilities:
Receivables	(1,223)	9,770
Inventories	19,713	8,238
Accounts payable and accrued expenses	(26,965)	1,679
Interest payable	(7,165)	(6,731)
Deferred revenue	(7,475)	4,314
Other assets and liabilities	17,977	23,396
Asset retirement obligation	(33,004)	(45,960)
Net cash provided by operating activities	21,154	85,103
Cash flows from investing activities:
Additions to property, plant and equipment	(25,365)	(30,619)
Proceeds from sales of restricted investments	33,686	31,903
Purchases of and change in restricted investments	(37,945)	(31,633)
Cash payments related to acquisitions	(3,580)	(125,315)
Proceeds from sales of assets	774	6,176
Receipts from loan and lease receivables	50,488	4,852
Payments related to loan and lease receivables	0	(2,141)
Other	(1,384)	(587)
Net cash provided by (used in) investing activities	16,674	(147,364)
Cash flows from financing activities:
Borrowings from long-term debt, net of debt discount	0	122,250
Repayments of long-term debt	(64,078)	(43,876)
Borrowings on revolving lines of credit	236,100	313,900
Repayments of revolving lines of credit	(225,560)	(315,900)
Debt issuance costs and other refinancing costs	0	(7,246)
Other	(550)	(798)
Net cash (used in) provided by financing activities	(54,088)	68,330
Effect of exchange rate changes on cash	321	(91)
Net (decrease) increase in cash and cash equivalents	(15,939)	5,978
Cash and cash equivalents, beginning of period	60,082	22,936
Cash and cash equivalents, end of period	44,143	28,914
Supplemental disclosures of cash flow information:
Cash paid for interest	81,478	79,099
Non-cash transactions:
Accrued purchases of property and equipment	3,508	4,166
Capital leases and other financing sources	$ 503	$ 19,830

BASIS OF PRESENTATION

BASIS OF PRESENTATION	9 Months Ended
	Sep. 30, 2017
Accounting Policies [Abstract]
BASIS OF PRESENTATION	1. BASIS OF PRESENTATION The accompanying unaudited consolidated financial statements include accounts of Westmoreland Coal Company (the “Company” or "WCC"), and its subsidiaries and controlled entities including those of Westmoreland Resource Partners, LP (“WMLP”). All intercompany transactions and accounts have been eliminated in consolidation. The consolidated financial statements of the Company have been prepared in accordance with United States Generally Accepted Accounting Principles (“GAAP”) and require the use of management’s estimates. The financial information contained in this Quarterly Report on Form 10-Q (“Quarterly Report”) is unaudited, but reflects all adjustments which, in the opinion of management, are necessary for a fair presentation of the financial information for the periods shown. Such adjustments are of a normal recurring nature. Certain prior period amounts have been reclassified to conform to current period presentation. The results of operations for the nine months ended September 30, 2017 are not necessarily indicative of results to be expected for the year ending December 31, 2017 . These unaudited quarterly consolidated financial statements should be read in conjunction with the audited consolidated financial statements and notes to the consolidated financial statements included in the Company’s Annual Report on Form 10-K for the year ended December 31, 2016 (“ 2016 Form 10-K”). There were no changes to our significant accounting policies from those disclosed in the audited consolidated financial statements and notes to the consolidated financial statements thereto contained in our 2016 Form 10-K, except as described below. Recently Issued Accounting Pronouncements In February 2016, the Financial Accounting Standards Board (“FASB”) issued Accounting Standards Update (“ASU”) 2016-02, Leases (Topic 842) which requires companies leasing assets to recognize on their balance sheet a liability to make lease payments (the lease liability) and a right-of-use asset representing its right to use the underlying asset for the lease term on contracts longer than one year. The lessee is permitted to make an accounting policy election to not recognize lease assets and lease liabilities for short-term leases. How leases are recorded on the balance sheet represents a significant change from previous GAAP guidance as described in Accounting Standards Codification (“ASC”) Topic 840, Leases. ASU 2016-02 maintains a distinction between finance leases and operating leases similar to the distinction under previous lease guidance for capital leases and operating leases. The impact of leases reported in the Company’s operating results and statement of cash flows are expected to be similar to previous GAAP. ASU 2016-02 is effective for fiscal years beginning after December 15, 2018, and early adoption is permitted. Adoption of the new lease accounting standard will require the Company to apply the new standard to the earliest period using a modified retrospective approach. The Company is currently in the process of evaluating the impact of the new standard, including the evaluation of the impact, if any, on changes to business processes, systems and controls to support recognition and disclosure under the new guidance, however, at this time is unable to determine the impact this standard will have on the financial statements and related disclosures. In January 2016, the FASB issued ASU 2016-01, Financial Instruments - Overall (Subtopic 825-10): Recognition and Measurement of Financial Assets and Financial Liabilities which updates certain aspects of recognition, measurement, presentation and disclosure of financial instruments. This standard is effective for interim and annual periods beginning after December 15, 2017. We anticipate adopting this ASU on January 1, 2018 will have an immaterial impact to the financial statements including reclassification of accumulated other comprehensive income for available-for-sale securities into equity at January 1, 2018, and future changes to the fair value of available-for-sale securities will be recognized in the income statement. In May 2014, the FASB issued ASU 2014-09, Revenue from Contracts with Customers which was issued as a new Topic, ASC Topic 606. The new revenue recognition standard supersedes all existing revenue recognition guidance. Under this ASU, an entity should recognize revenue when it transfers promised goods or services to customers in an amount that reflects the consideration to which the entity expects to be entitled in exchange for those goods or services. ASU 2015-14, issued in August 2015, deferred the effective date of ASU 2014-09 to the first quarter of 2018, with early adoption permitted in the first quarter of 2017. The Company intends to adopt the amended guidance as of January 1, 2018. In March, April, May, and December 2016, the FASB issued the following updates, respectively, to provide supplemental adoption guidance and clarification to ASU 2014-09. These standards must be adopted concurrently upon the adoption of ASU 2014-09. We are currently evaluating the potential effects of adopting the provisions of these updates. • ASU 2016-08, Revenue from Contracts with Customers: Principal versus Agent Considerations (Reporting Revenue Gross versus Net). • ASU 2016-10, Revenue from Contracts with Customers: Identifying Performance Obligations and Licensing. • ASU 2016-12, Revenue from Contracts with Customers: Narrow-Scope Improvements and Practical Expedients. • ASU 2016-19, Technical Corrections and Improvements. We have established an implementation team to execute a multi-phase plan to adopt the requirements of the new standard. The team is in the process of finalizing its conclusions on how the guidance will be applied to all coal sales contracts comprising greater than half of our consolidated revenues. The team is also evaluating the expanded disclosures required by the new standard and reviewing our processes and internal controls over financial reporting to ensure the appropriate information will be available for these disclosures. No changes will be required to our system capabilities to obtain the appropriate information. Under the new standard, companies may use either of the following transition methods: (i) a full retrospective approach reflecting the application of the standard in each prior reporting period with the option to elect certain practical expedients; or (ii) a modified retrospective approach with the cumulative effect of initially adopting ASU 2014-09 recognized at the date of adoption (which includes additional footnote disclosures). We will be adopting the standard under the full retrospective approach. Based on our implementation team’s analyses, we believe the implementation of the new standard will have a material impact on our consolidated financial statements for sales contracts in which we are entitled to payments from customers to reimburse our costs incurred during final reclamation. Under current GAAP, as these amounts are not fixed and determinable until they are incurred, we have been precluded from recognizing revenue until the costs have been incurred during final reclamation. However, under ASC Topic 606, these payments from customers constitute variable consideration and therefore must be estimated at contract inception and recognized as revenue as we satisfy our performance obligations of delivering coal to the customer. This will ultimately result in a significant acceleration of revenue, most of which will be recognized as a transition adjustment as of January 1, 2016. The implementation team is currently reviewing the models to quantify the exact amount of the transition adjustment and related impact to revenues for the years ended December 31, 2017 and 2016.

ACQUISITION

ACQUISITION	9 Months Ended
	Sep. 30, 2017
Business Combinations [Abstract]
ACQUISITION	2. ACQUISITION Acquisition of San Juan On January 31, 2016, Westmoreland San Juan, LLC (“WSJ”), a variable interest entity of the Company, acquired San Juan Coal Company (“SJCC”), which operates the San Juan mine in Farmington, New Mexico, and San Juan Transportation Company (“SJTC” and such transaction, the “San Juan Acquisition”) for a total cash purchase price of $121.0 million . The San Juan mine is the exclusive supplier of coal to the adjacent San Juan Generating Station (“SJGS”) under a coal supply agreement through 2022. The San Juan operations are included in the Company’s Coal - U.S. segment. WSJ financed the San Juan Acquisition principally with a $125.0 million loan from NM Capital Utility Corporation (the “San Juan Loan”), an affiliate of Public Service Company of New Mexico (one of the owners of SJGS). The San Juan Acquisition has been accounted for under the acquisition method of accounting that requires the total purchase consideration to be allocated to the assets acquired and liabilities assumed based on estimates of fair value. Purchase price accounting was considered final as of December 31, 2016 . The allocation of the purchase consideration follows (in millions): Purchase price: Cash paid $ 121.0 Allocation of purchase price: Assets: Inventories $ 8.8 Total current assets 8.8 Land and mineral rights 143.9 Plant and equipment 74.6 Other assets 1.3 Total assets 228.6 Liabilities: Trade payables and other accrued liabilities 13.4 Production taxes 2.0 Asset retirement obligations 0.7 Total current liabilities 16.1 Asset retirement obligations, less current portion 43.5 Postretirement medical benefits 1.9 Deferred income taxes 46.1 Total liabilities 107.6 Net fair value $ 121.0 Unaudited Pro Forma Information The following unaudited pro forma information has been prepared for illustrative purposes only and assumes the San Juan Acquisition occurred on January 1, 2016. The unaudited pro forma results have been prepared based on estimates and assumptions, which the Company believes are reasonable, however, they are not necessarily indicative of the consolidated results of operations had the acquisitions occurred on the dates indicated above, or of future results of operations. Nine Months Ended September 30, 2016 (In thousands, except per share data) Revenues As reported $ 1,085,223 Pro forma (unaudited) 1,111,498 Operating income As reported $ 15,489 Pro forma (unaudited) 16,584 Net loss applicable to common shareholders As reported $ (19,550 ) Pro forma (unaudited) (19,125 ) Net loss per share applicable to common shareholders (basic and diluted) As reported $ (1.06 ) Pro forma (unaudited) (1.04 )

VARIABLE INTEREST ENTITY

VARIABLE INTEREST ENTITY	9 Months Ended
	Sep. 30, 2017
Organization, Consolidation and Presentation of Financial Statements [Abstract]
VARIABLE INTEREST ENTITY	3. VARIABLE INTEREST ENTITY The Company consolidates its 100% owned WSJ subsidiary which qualifies as a variable interest entity (“VIE”) under GAAP. WSJ’s classification as a VIE is due to a third party lender having the potential right to receive WSJ’s residual returns. The Company is the primary beneficiary because it has the power to direct the activities that most significantly impact WSJ’s economic performance. Accordingly, the Company consolidated the operating results, assets and liabilities of WSJ. See Note 2 - Acquisition to the consolidated financial statements (unaudited) for details surrounding the VIE’s acquisition and Note 6 - Debt And Lines Of Credit to the consolidated financial statements (unaudited) for the VIE’s debt structure. The following table presents the carrying amounts, after eliminating the effect of intercompany transactions, included in the Consolidated Balance Sheets that are for the use of or are the obligation of WSJ: September 30, 2017 December 31, 2016 (In thousands) Assets $ 215,230 $ 268,910 Liabilities 180,559 243,884 Net carrying amount $ 34,671 $ 25,026

INVENTORIES

INVENTORIES	9 Months Ended
	Sep. 30, 2017
Inventory Disclosure [Abstract]
INVENTORIES	4. INVENTORIES Inventories consisted of the following: September 30, 2017 December 31, 2016 (In thousands) Coal stockpiles $ 36,013 $ 44,692 Coal fuel inventories 1,338 6,816 Materials and supplies 76,669 77,628 Reserve for obsolete inventory (3,844 ) (3,621 ) Total $ 110,176 $ 125,515

RESTRICTED INVESTMENTS AND BOND

RESTRICTED INVESTMENTS AND BOND COLLATERAL	9 Months Ended
	Sep. 30, 2017
Disclosure Restricted Investments and Bond Collateral [Abstract]
RESTRICTED INVESTMENTS AND BOND COLLATERAL	5. RESTRICTED INVESTMENTS AND BOND COLLATERAL The Company invests certain bond collateral, reclamation deposits, and other restricted investments in a limited selection of fixed-income investment options and receives the corresponding investment returns. These investments are not available to meet the Company’s general cash needs. These accounts include available-for-sale securities. Available-for-sale securities are reported at fair value with unrealized gains and losses excluded from earnings and reported in Accumulated other comprehensive loss . The Company’s carrying value and estimated fair value of its restricted investments at September 30, 2017 were as follows: Restricted Investments and Bond Collateral Reclamation Deposits Total Restricted Investments (In thousands) Cash and cash equivalents $ 65,441 $ 3,443 $ 68,884 Time deposits 2,467 — 2,467 Available-for-sale 79,505 73,493 152,998 $ 147,413 $ 76,936 $ 224,349 The Company’s carrying value and estimated fair value of its restricted investments at December 31, 2016 were as follows: Restricted Investments and Bond Collateral Reclamation Deposits Total Restricted Investments (In thousands) Cash and cash equivalents $ 66,860 $ 2,673 $ 69,533 Time deposits 2,473 — 2,473 Available-for-sale 75,580 71,689 147,269 $ 144,913 $ 74,362 $ 219,275 Available-for-Sale Restricted Investments The cost basis, gross unrealized holding gains and losses, and fair value of available-for-sale securities at September 30, 2017 were as follows: Restricted Investments and Bond Collateral Reclamation Deposits Total Restricted Investments (In thousands) Cost basis $ 79,724 $ 73,470 $ 153,194 Gross unrealized holding gains 520 624 1,144 Gross unrealized holding losses (739 ) (601 ) (1,340 ) Fair value $ 79,505 $ 73,493 $ 152,998 The cost basis, gross unrealized holding gains and losses, and fair value of available-for-sale securities at December 31, 2016 were as follows: Restricted Investments and Bond Collateral Reclamation Deposits Total Restricted Investments (In thousands) Cost basis $ 76,558 $ 72,381 $ 148,939 Gross unrealized holding gains 251 453 704 Gross unrealized holding losses (1,229 ) (1,145 ) (2,374 ) Fair value $ 75,580 $ 71,689 $ 147,269

DEBT AND LINES OF CREDIT

DEBT AND LINES OF CREDIT	9 Months Ended
	Sep. 30, 2017
Debt Disclosure [Abstract]
DEBT AND LINES OF CREDIT	6. DEBT AND LINES OF CREDIT The Company and its subsidiaries are subject to the following debt arrangements: Total Debt Outstanding September 30, 2017 December 31, 2016 (In thousands) 8.75% Notes $ 350,000 $ 350,000 Term Loan 321,417 323,883 San Juan Loan 66,230 95,000 WMLP Term Loan 311,628 306,189 Revolver 10,540 — WMLP Revolver — — Capital lease obligations 36,736 55,061 Other debt 4,512 16,464 Total debt 1,101,063 1,146,597 Less debt discount and issuance costs, net (29,915 ) (37,531 ) Less current installments (49,712 ) (86,272 ) Long-term debt, less current installments $ 1,021,436 $ 1,022,794 The following table presents remaining aggregate contractual debt maturities of all long-term debt as of September 30, 2017 (in thousands): Debt Held by WMLP All Other Debt Total Debt Outstanding 2017 $ 1,660 $ 30,572 $ 32,232 2018 315,804 18,852 334,656 2019 4,105 15,439 19,544 2020 1,694 338,571 340,265 2021 1,586 21,164 22,750 Thereafter 1,616 350,000 351,616 Total debt $ 326,465 $ 774,598 $ 1,101,063 Covenant Compliance Our lending arrangements contain, among other terms, events of default and various affirmative and negative covenants, financial covenants and cross-default provisions. Certain affirmative covenants in our WMLP Term Loan provide that an explanatory paragraph expressing substantial doubt about WMLP's ability to continue as a going concern constitutes an event of default. We are in compliance with our covenants for the quarter ending September 30, 2017 . Our continuing ability to meet our obligations and comply with our covenants depends on our ability to generate adequate cash flows and refinance debt obligations as they become due. Should we be unable to comply with any future debt-related covenant, we will be required to seek a waiver of such covenant to avoid an event of default. Covenant waivers and modifications may be expensive to obtain or potentially unavailable. As of September 30, 2017 , we are in compliance with the fixed charge ratio under our revolver agreements. Based on current projections, absent management plans, there is substantial doubt as to our ability to comply with this covenant during the next twelve months from this filing. If we were to breach this covenant and were unable to obtain a waiver from the lenders, we could lose access to the Revolver . An uncured breach of the covenants in our Revolver would trigger certain customary cross-default provisions in our $350.0 million 8.75% Notes and our $321.4 million Term Loan which would become immediately due. Our belief, based on historical patterns, is that it is probable we would be able to alleviate or cure any such Revolver covenant default with an amendment or waiver. 8.75% Notes Pursuant to our senior note indenture, dated as of December 16, 2014, by and among the Company, the guarantors named therein, and U.S. Bank National Association, as trustee and notes collateral agent (the “Indenture”), our senior secured 8.75% Notes mature on January 1, 2022 and pay interest semiannually on January 1 and July 1 of each year at a fixed 8.75% interest rate (“ 8.75% Notes ”). The 8.75% Notes are a primary obligation of the Company and are guaranteed by Westmoreland Energy LLC, Westmoreland Mining LLC and Westmoreland Resources, Inc. and their respective subsidiaries (other than Absaloka Coal, LLC, Westmoreland Risk Management, Inc. and certain other immaterial subsidiaries), referred to as the “Guarantors.” The 8.75% Notes are not guaranteed by Westmoreland Canada LLC or any of its subsidiaries, WSJ or any of its subsidiaries, or Westmoreland Resources GP, LLC or WMLP, referred to as the “Non-guarantors.” Term Loan Pursuant to our credit agreement, dated as of December 22, 2014, by and among the Company, the lenders from time to time party thereto, and Bank of Montreal, as administrative agent, as amended, our term loan (“ Term Loan ”) matures on December 16, 2020 and accrues interest on a quarterly basis at a variable interest rate which is set at our election at (i) the one-, two-, three- or six-month London Interbank Offered Rate (“LIBOR”) plus 6.50% or (ii) a base rate (determined with reference to the highest of the prime rate, the Federal Funds Rate plus 0.05%, or three-month LIBOR plus 1.00%) plus 5.50%. As of September 30, 2017 , the interest rate was 7.80% . The Term Loan is a primary obligation of WCC and is guaranteed by the Guarantors. San Juan Loan Pursuant to the loan agreement, dated as of February 1, 2016, by and among WSJ and the remaining Westmoreland San Juan Entities as guarantors, and NM Capital Utility Corporation (an affiliate of Public Service Company of New Mexico, part owner of SJGS) as lender, we financed the San Juan Acquisition in part with a senior secured $125.0 million term loan (“ San Juan Loan ”). The San Juan Loan matures on February 1, 2021 and pays interest and principal on a quarterly basis at an interest rate of (i) 7.25% (the “Margin Rate”) plus (ii) (A) the LIBOR for a three month period plus (B) a statutory reserve rate, which such Margin Rate increasing incrementally during each year of the San Juan Loan term. As of September 30, 2017 , the cash interest rate is 10.57% . It is a primary obligation of WSJ, is guaranteed by SJCC, and is secured by substantially all of SJCC’s assets. The San Juan Loan has no prepayment penalties. The agreements governing the San Juan Loan include representations and warranties and covenants regarding the ownership and operation of SJCC and the properties acquired in the San Juan Acquisition and standard special purpose bankruptcy remote entity covenants designed to preserve the separateness from the Company of each of (i) WSJ, (ii) WSJ’s direct parent company, Westmoreland San Juan Holdings, Inc., (iii) SJCC and (iv) SJTC (collectively, the “Westmoreland San Juan Entities”). Obligations under the San Juan Loan are recourse only to the Westmoreland San Juan Entities and their assets. Neither the Company nor its subsidiaries (other than the Westmoreland San Juan Entities) is an obligor under the San Juan Loan in any respect. The agreement governing the San Juan Loan requires that all revenues of the Westmoreland San Juan Entities, aside from payments on certain leases, are deposited into a cash management collection account swept monthly for operating expenses, capital expenditures, and loan payment and prepayment. The assets and credit of SJCC are not available to satisfy the debts and other obligations of the Company other than those of the Westmoreland San Juan Entities. WMLP Term Loan Pursuant to the financing agreement, dated as of December 31, 2014, by and among Oxford Mining Company, LLC, WMLP and each of its subsidiaries, lenders from time to time party thereto, and U.S. Bank National Association, as administrative agent, the term loan of WMLP (“ WMLP Term Loan ”) matures on December 31, 2018 and pays interest on a quarterly basis at a variable rate equal to the 3-month LIBOR rate at each period end ( 1.30% at September 30, 2017 ), subject to a floor of 0.75% , plus 8.50% or the reference rate, as defined in the financing agreement. As of September 30, 2017 , the cash interest rate was 9.80% . The WMLP Term Loan is a primary obligation of Oxford Mining Company, LLC, a wholly owned subsidiary of WMLP, is guaranteed by WMLP and its subsidiaries, and is secured by substantially all of WMLP’s and its subsidiaries’ assets. The WMLP Term Loan also provides for Paid-In-Kind Interest (“PIK Interest”) at a variable rate between 1.00% and 3.00% based on its consolidated total net leverage ratio as defined in the financing agreement. The rate of PIK Interest is determined on a quarterly basis with the PIK Interest added quarterly to the then-outstanding principal amount of the WMLP Term Loan under the financing agreement. PIK Interest under the financing agreement was $2.3 million and $7.0 million for the three and nine months ended September 30, 2017 , respectively. The outstanding WMLP Term Loan amount represents the principal balance of $288.6 million , plus PIK Interest of $23.1 million . The WMLP Term Loan limits cash distributions to an aggregate amount not to exceed $15.0 million (“Restricted Distributions”), if WMLP has: (i) a consolidated total net leverage ratio of greater than 3.75 , or fixed charge coverage ratio of less than 1.00 (as such ratios are defined in the WMLP Term Loan financing agreement), or (ii) liquidity of less than $7.5 million , after giving effect to such cash distribution and applying WMLP's availability under the WMLP Revolver . As of September 30, 2017 , WMLP’s consolidated total net leverage ratio is in excess of 3.75 . As of September 30, 2017 , WMLP has distributed $14.8 million in cash that counts toward the $15.0 million in aggregate Restricted Distribution payments. On October 27, 2017, WMLP announced a quarterly cash distribution for the quarter ended September 30, 2017 , of $0.1155 per limited partner common unit, general partner unit and warrant with distribution rights and a distribution of Series A PIK Units in lieu of a cash distribution for holders of Series A Convertible Units (“Third Quarter Distribution”), which is a per-unit reduction of $0.0178 from the prior quarter distribution of $0.1333 per limited partner common unit, general partner unit, warrant with distribution rights, as well as Series A PIK Unit distribution. The Third Quarter Distribution, totaling cash of approximately $0.2 million , will be paid on November 14, 2017 to all holders of record as of November 7, 2017. Subsequent to payment of this Third Quarter Distribution, WMLP will have utilized the full $15.0 million limit on Restricted Distributions, and WMLP will be restricted from making any further distributions under the terms of the WMLP Term Loan financing agreement. Revolver Pursuant to the second amended and restated loan and security agreement, dated as of December 16, 2014, by and among the Company and certain of its subsidiaries, lenders party thereto, and Canadian Imperial Bank of Commerce (formerly known as The PrivateBank and Trust Company), as administrative agent (the “ Revolver ”), the Company’s Revolver has a total aggregate borrowing capacity of $60.0 million between June 15th and August 31st of each year, with an aggregate borrowing capacity of $50.0 million outside of these periods subject to borrowing base calculations as defined in the agreement. The availability of the Revolver consists of a $30.0 million sub-facility ( $35.0 million with the seasonal increase) available to our U.S. borrowers and a $20.0 million sub-facility ( $25.0 million with the seasonal increase) available to our Canadian borrowers. The Revolver may support an equal amount of letters of credit, with outstanding letter of credit balances reducing availability under the Revolver . At September 30, 2017 , availability on the Revolver was $16.7 million which reflects $9.9 million in outstanding letters of credit and $12.8 million in borrowing base restrictions. We had $10.5 million borrowings on the Revolver . The Revolver has a maturity date of December 31, 2018 . On May 9, 2017, the Company executed a tenth amendment to our Revolver (“Tenth Amendment”). The Tenth Amendment adjusted the fixed charge coverage ratio calculation by further modifying the treatment of the accelerated repayment of the loan and lease receivable arrangement at our Genesee mine from March 24, 2017, and removing certain testing periods from the U.S. and Canadian fixed charge coverage ratio calculation so long as the Company meets certain liquidity requirements. WMLP Revolver Pursuant to the loan and security agreement, dated as of October 23, 2015, by and among WMLP and its subsidiaries, lenders party thereto, and Canadian Imperial Bank of Commerce (formerly known as The PrivateBank and Trust Company), as administrative agent (the “ WMLP Revolver ”), the WMLP Revolver permits WMLP to borrow up to the aggregate principal amount of $15.0 million subject to borrowing base restrictions as defined in the agreement. The WMLP Revolver also allows letters of credit in an aggregate outstanding amount of up to $10.0 million , which reduces availability under the WMLP Revolver on a dollar-for-dollar basis. At September 30, 2017 , availability under the WMLP Revolver was $14.8 million . The WMLP Revolver has a maturity date of December 31, 2017. Capital lease obligations The Company engages in leasing transactions for equipment utilized in its mining operations. During the nine months ended September 30, 2017 , the Company entered into $0.7 million of new capital leases.

POSTRETIREMENT MEDICAL BENEFITS

POSTRETIREMENT MEDICAL BENEFITS AND PENSION	9 Months Ended
	Sep. 30, 2017
Retirement Benefits [Abstract]
POSTRETIREMENT MEDICAL BENEFITS AND PENSION	7. POSTRETIREMENT MEDICAL BENEFITS AND PENSION Postretirement Medical Benefits The Company provides postretirement medical benefits to retired employees and their dependents as mandated by the Coal Industry Retiree Health Benefit Act of 1992 and pursuant to collective bargaining agreements. The Company also provides these benefits to qualified full-time employees pursuant to collective bargaining agreements. The components of net periodic postretirement medical benefit cost are as follows: Three Months Ended September 30, Nine Months Ended September 30, 2017 2016 2017 2016 (In thousands) Components of net periodic benefit cost: Service cost $ 793 $ 763 $ 2,380 $ 2,507 Interest cost 3,197 3,075 9,590 9,278 Amortization of deferred items 964 368 2,893 891 Total net periodic benefit cost $ 4,954 $ 4,206 $ 14,863 $ 12,676 The following table shows the net periodic postretirement medical benefit costs that relate to current and former mining operations: Three Months Ended September 30, Nine Months Ended September 30, 2017 2016 2017 2016 (In thousands) Former mining operations $ 2,305 $ 2,135 $ 6,916 $ 6,405 Current operations 2,649 2,071 7,947 6,271 Total net periodic benefit cost $ 4,954 $ 4,206 $ 14,863 $ 12,676 The costs for the former mining operations are included in Heritage health benefit expenses and costs for current operations are included in Cost of sales and Selling and administrative expenses. Pension The Company provides pension benefits to qualified full-time employees pursuant to collective bargaining agreements. The Company incurred net periodic benefit costs of providing these pension benefits as follows: Three Months Ended September 30, Nine Months Ended September 30, 2017 2016 2017 2016 (In thousands) Components of net periodic benefit cost: Service cost $ 348 $ 373 $ 1,133 $ 1,242 Interest cost 2,596 2,564 7,855 7,926 Expected return on plan assets (3,643 ) (3,349 ) (10,918 ) (10,390 ) Settlements — 247 269 247 Amortization of deferred items 588 1,294 1,765 3,639 Total net periodic pension cost $ (111 ) $ 1,129 $ 104 $ 2,664 These costs are included in Cost of sales and Selling and administrative expenses. The Company made $1.1 million and $0.6 million of contributions to its pension plans in the nine months ended September 30, 2017 and 2016 , respectively. The Company expects to make $0.1 million of contributions to its pension plans during the remainder of 2017 .

DERIVATIVE INSTRUMENTS

DERIVATIVE INSTRUMENTS	9 Months Ended
	Sep. 30, 2017
Derivative Instruments and Hedging Activities Disclosure [Abstract]
DERIVATIVE INSTRUMENTS	8. DERIVATIVE INSTRUMENTS Derivative Assets and Liabilities The Company evaluates all of its financial instruments to determine if such instruments are derivatives, derivatives that qualify for the normal purchase normal sale exception, or contain features that qualify as embedded derivatives. All derivative financial instruments, except for derivatives that qualify for the normal purchase normal sale exception, are recognized on the balance sheet at fair value. Changes in fair value are recognized in earnings if they are not eligible for hedge accounting or in other comprehensive income if they qualify for cash flow hedge accounting. The Company has power purchase contracts at its Roanoke Valley Power Facility (“ROVA”) to manage exposure to power price fluctuations. These contracts cover the period from April 2014 to March 2019 and contracted power prices range from $41.05 to $55.20 per megawatt hour, with a weighted average contract price of $44.67 over the remaining contract lives. The contracts are not designated as hedging instruments, and accordingly their fair value is recognized on the Consolidated Balance Sheets, with changes in fair value recognized in the Consolidated Statements of Operations. Fair value is based on a comparison of contracted prices to projected future market prices which are Level 2 inputs based on the hierarchy defined below, please see Note 9 - Fair Value Measurements to the consolidated financial statements (unaudited). During the fourth quarter of 2016, the Company entered into a Substitute Energy Purchase Agreement (the “SEP Agreement”) which amends our previous power purchase and operating agreement with our customer. The SEP Agreement, which covers the period from March 1, 2017 to March 31, 2019, enables us to fulfill our obligations under the contract without physically operating the facility. The SEP Agreement calls for fixed payments ranging from $21.33 to $24.32 (representing a weighted average price of $23.79 per megawatt hour) while optional power deliveries are $15.26 per megawatt hour. The SEP Agreement meets the definition of a derivative and it does not qualify for the normal purchases and normal sales scope exception. This contract is not designated as a hedging instrument, therefore, its fair value is recognized on the Consolidated Balance Sheets and changes in fair value recognized in the Consolidated Statements of Operations. As the underlying power deliveries option is significantly in the money, the fair value of this derivative is based on comparing expected contracted cash inflows per the SEP Agreement to expected future outflows based on projected market prices. During the fourth quarter of 2017, the Company exited our derivative positions as described in Note 16 - Subsequent Events to the consolidated financial statements (unaudited). The fair value of outstanding derivative instruments not designated as hedging instruments on the accompanying unaudited Consolidated Balance Sheets was as follows (in thousands): Derivative Instruments Balance Sheet Location September 30, 2017 December 31, 2016 Contracts to purchase power Other current liabilities $ 18,097 $ 13,382 Contracts to purchase power Other liabilities 10,100 18,384 Contract to sell power Other current assets 15,879 10,240 Contract to sell power Other assets 6,829 9,528 The effect of derivative instruments not designated as hedging instruments on the accompanying unaudited Consolidated Statements of Operations was as follows (in thousands): Three Months Ended September 30, Nine Months Ended September 30, Derivative Instruments Statements of Operations Location 2017 2016 2017 2016 Contracts to purchase power Derivative (gain) loss $ (6,812 ) $ 5,442 $ (3,570 ) $ 2,164 Contract to sell power Derivative (gain) loss 2,145 — (3,001 ) — $ (4,667 ) $ 5,442 $ (6,571 ) $ 2,164

FAIR VALUE MEASUREMENTS

FAIR VALUE MEASUREMENTS	9 Months Ended
	Sep. 30, 2017
Fair Value Disclosures [Abstract]
FAIR VALUE MEASUREMENTS	9. FAIR VALUE MEASUREMENTS Fair value is the price that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants at the measurement date. The fair value hierarchy prioritizes the inputs to valuation techniques used to measure fair value. The hierarchy, as defined below, gives the highest priority to unadjusted quoted prices in active markets for identical assets or liabilities and the lowest priority to unobservable inputs. For other fair value disclosures, see also Note 5 - Restricted Investments And Bond Collateral and Note 8 - Derivative Instruments to the consolidated financial statements (unaudited). • Level 1, defined as observable inputs such as quoted prices in active markets for identical assets. • Level 2, 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. • Level 3, defined as unobservable inputs in which little or no market data exists, therefore requiring an entity to develop its own assumptions. The table below sets forth, by level, the Company’s financial assets and liabilities that are accounted for at fair value at September 30, 2017 : Quoted Prices in Active Markets for Identical Assets or Liabilities Significant Other Observable Inputs Fair Value Level 1 Level 2 (In thousands) Assets: Contract to sell power included in Other current assets and Other assets $ 22,708 $ — $ 22,708 Available-for-sale investments included in Restricted investments and bond collateral 79,505 79,505 — Available-for-sale investments included in Reclamation deposits 73,493 73,493 — $ 175,706 $ 152,998 $ 22,708 Liabilities: Contracts to purchase power included in Other current liabilities and Other liabilities $ 28,197 $ — $ 28,197 Warrants issued by WMLP included in Other liabilities 316 316 — $ 28,513 $ 316 $ 28,197 Long-term debt fair value estimates are based on observed prices for securities with an active trading market when available (Level 2) and otherwise using discount rate estimates based on interest rates (Level 3). As of September 30, 2017 , the Company valued the WMLP Term Loan and the San Juan Loan with Level 3 fair values. The estimated fair values of the Company’s debt with fixed and variable interest rates are as follows: Fixed Interest Rate Variable Interest Rate Carrying Value Fair Value Carrying Value Fair Value (In thousands) (In thousands) September 30, 2017 $ 380,583 $ 277,497 $ 690,565 $ 482,551 December 31, 2016 409,362 395,274 699,704 658,557

INCOME TAX

INCOME TAX	9 Months Ended
	Sep. 30, 2017
Income Tax Disclosure [Abstract]
INCOME TAXES	10. INCOME TAX For interim income tax reporting the Company estimates its annual effective tax rate and applies this effective tax rate to its year-to-date pre-tax (loss) income. For the nine months ended September 30, 2016 , the effective tax rate differed from the statutory rate primarily as a result of the U.S. and Canadian valuation allowances and due to the recognition of changes in the Company's net deferred tax assets due to the San Juan Acquisition. For the nine months ended September 30, 2017 the effective tax rate differed from the statutory rate primarily due to the U.S. and Canadian valuation allowances. In connection with the January 31, 2016 San Juan Acquisition during the nine months ended September 30, 2016 , the Company recognized $47.6 million in deferred tax liabilities. Accordingly, the $47.6 million decrease in the Company’s net deferred tax assets resulted in the release of a corresponding $47.6 million valuation allowance and recognition of a tax benefit in the nine months ended September 30, 2016 . Tax Benefits Preservation Plan As of December 31, 2016, WCC had a U.S. federal net operating loss carryforward of $581.4 million , together with certain other tax attributes. WCC's ability to utilize these tax assets to offset future taxable income may be significantly limited if WCC experiences an "ownership change", as defined in Section 382 of the Internal Revenue Code of 1986, as amended (the "Code"). In general, an ownership change will occur if the percentage of the stock owned cumulatively by one or more “5 % shareholders” has increased by more than 50 percentage points over the lowest percentage of stock owned by such shareholders at any time over a rolling three-year period. On September 2, 2017, the board of directors of WCC adopted a tax benefits preservation plan or stockholder rights plan (the "Plan"). The purpose of the Plan is to minimize the likelihood of an ownership change occurring for Section 382 purposes and thus protect WCC's ability to utilize certain net operating loss carryovers and other tax benefits of the Company and its subsidiaries (the “Tax Benefits”) to offset future income. The Plan is intended to act as a deterrent to any person or group acquiring “beneficial ownership” (within the meaning of applicable SEC rules) of 4.75% or more of the outstanding shares of WCC's common stock, par value $0.01 per share without the approval of the board of directors. The description and terms of the Rights (as defined below) applicable to the Plan are set forth in the 382 Rights Agreement, dated as of September 5, 2017 (the “Rights Agreement”), by and between WCC and Broadridge Corporate Issuer Solutions, Inc., as Rights Agent. As part of the Rights Agreement, the board of directors authorized and declared a dividend distribution of one right (a “Right”) for each outstanding share of common stock to stockholders of record at the close of business on September 18, 2017. Each Right entitles the holder to purchase from WCC a unit consisting of one ten thousandth of a share (a “Unit”) of Series A Participating Preferred Stock, par value $0.01 per share, of WCC at a purchase price of $10.00 per Unit, subject to adjustment. Until a Right is exercised, the holder thereof, as such, will have no separate rights as a stockholder of WCC, including the right to vote or to receive dividends in respect of Rights.

SHAREHOLDERS' DEFICIT AND ACCUM

SHAREHOLDERS' DEFICIT AND ACCUMULATED OTHER COMPREHENSIVE LOSS	9 Months Ended
	Sep. 30, 2017
Equity [Abstract]
SHAREHOLDERS' DEFICIT AND ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS)	11. STOCKHOLDERS’ DEFICIT AND ACCUMULATED OTHER COMPREHENSIVE LOSS Changes in Accumulated Other Comprehensive Loss The following table reflects the changes in accumulated other comprehensive loss by component: Pension Postretirement medical benefits Unrealized gains and losses on available-for-sale securities, net Foreign currency translation adjustment Tax effect of other comprehensive income gains Accumulated other comprehensive income (loss) (In thousands) Balance at December 31, 2016 $ (26,123 ) $ (51,893 ) $ (1,674 ) $ (61,073 ) $ (38,309 ) $ (179,072 ) Other comprehensive income (loss) before reclassifications 189 — 1,184 17,455 (2,503 ) 16,325 Amounts reclassified from accumulated other comprehensive income (loss) 1,765 2,893 290 — — 4,948 Balance at September 30, 2017 $ (24,169 ) $ (49,000 ) $ (200 ) $ (43,618 ) $ (40,812 ) $ (157,799 ) The following table reflects the reclassifications out of accumulated other comprehensive loss for the three and nine months ended September 30, 2017 (in thousands): Details about accumulated other comprehensive loss components Amount reclassified from accumulated other comprehensive loss Affected line items in the statements where presented Three Months Ended September 30, 2017 Nine Months Ended September 30, 2017 Available-for-sale securities Realized (gains) and losses on available-for-sale securities $ (4 ) $ 290 Other (loss) income Amortization of defined benefit pension items Prior service costs $ 2 $ 6 Cost of sales and Selling and administrative Actuarial losses 581 1,759 Cost of sales and Selling and administrative Total $ 583 $ 1,765 Amortization of postretirement medical items Prior service costs $ (159 ) $ (477 ) Cost of sales and Selling and administrative Actuarial losses 1,123 3,370 Cost of sales and Selling and administrative Total $ 964 $ 2,893

SHARE-BASED COMPENSATION

SHARE-BASED COMPENSATION	9 Months Ended
	Sep. 30, 2017
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
SHARE-BASED COMPENSATION	12. SHARE-BASED COMPENSATION The Company grants employees and non-employee directors restricted stock units. The Company recognized compensation expense from share-based arrangements shown in the following table: Three Months Ended September 30, Nine Months Ended September 30, 2017 2016 2017 2016 (In thousands) Recognition of value of restricted stock units and cash units over vesting period; and issuance of stock $ 1,366 $ 1,391 $ 3,846 $ 3,733 Contributions of stock to the Company’s 401(k) plan — — — 2,192 Total share-based compensation expense $ 1,366 $ 1,391 $ 3,846 $ 5,925 2017 Grant During the nine months ended September 30, 2017 , the Company granted the following stock-based awards under the Amended and Restated 2014 Equity Incentive Plan: • 713,238 restricted stock units, of which 338,968 vest based on a service condition, 187,135 vest based on a service and market condition, and 187,135 vest based on a service and performance condition. • 375,658 cash units (“the Cash Units”), which represent the right to cash equal to the closing price of WCC common stock as of the vesting date, of which 157,880 vest based on a service condition, 108,889 vest based on a service and market condition, and 108,889 vest based on a service and performance condition. Restricted Stock Units Unamortized compensation expense is expected to be recognized over the next three years. A summary of outstanding restricted stock units as of September 30, 2017 is as follows: Units Weighted Average Grant-Date Fair Value Unamortized Compensation Expense (In thousands) Non-vested at December 31, 2016 700,500 $ 15.91 Granted 713,238 3.94 Vested (246,724 ) 18.34 Forfeited (44,870 ) 8.31 Non-vested at September 30, 2017 1,122,144 $ 8.80 $ 4,568 Cash Units The compensation expense related to the Cash Units was $0.3 million and $0.2 million for the nine months ended September 30, 2017 and 2016 , respectively. Because the cash units are settled in cash they are accounted for as a liability award. The accrued liability related to the Cash Units was $0.1 million and $0.4 million as of September 30, 2017 and December 31, 2016 , respectively. Other Plans In May 2016, the Company discontinued matching employees’ 401k contributions with common shares and elected instead to match with cash contributions. During 2016, the Company contributed 342,353 common shares to match employees’ contributions to their 401k plans. 342,353

EARNINGS PER SHARE

EARNINGS PER SHARE	9 Months Ended
	Sep. 30, 2017
Earnings Per Share [Abstract]
EARNINGS PER SHARE	13. EARNINGS PER SHARE Basic earnings (loss) per share has been computed by dividing the net income (loss) applicable to common stockholders by the weighted average number of shares of common stock outstanding during each period. Net income (loss) applicable to common stockholders includes the adjustment for net income or loss attributable to noncontrolling interest. Diluted earnings (loss) per share is computed by including the dilutive effect of common stock that would be issued assuming conversion or exercise of outstanding stock options and and restricted stock units. No such items were included in the computations of diluted loss per share in the three and nine months ended September 30, 2017 and in the three and nine months ended September 30, 2016 because the Company incurred a net loss applicable to common stockholders in these periods and the effect of inclusion would have been anti-dilutive. The table below shows the number of shares that were excluded from the calculation of diluted loss per share because their inclusion would be anti-dilutive to the calculation: Three Months Ended September 30, Nine Months Ended September 30, 2017 2016 2017 2016 (In thousands) Restricted stock units and stock options 1,201 853 1,201 853

SEGMENT INFORMATION

SEGMENT INFORMATION	9 Months Ended
	Sep. 30, 2017
Segment Reporting [Abstract]
SEGMENT INFORMATION	14. SEGMENT INFORMATION Segment information is based on a management approach which requires segmentation based upon the Company’s internal organization, reporting of revenues and operating income (loss). The Company’s operations are classified into six reporting segments: Coal - U.S., Coal - Canada, Coal - WMLP, Power, Heritage, and Corporate. For a detailed description of the Company’s operations segmentation please see our 2016 Form 10-K. Summarized financial information by segment is as follows: Coal - U.S. (1) Coal - Canada Coal - WMLP (1) Power Heritage Corporate Consolidated (In thousands) Three Months Ended September 30, 2017 Revenues $ 142,040 $ 115,688 $ 85,607 $ 20,070 $ — $ (5,394 ) $ 358,011 Depreciation, depletion, and amortization 19,826 8,590 9,691 — — (41 ) 38,066 Operating income (loss) 7,212 1,206 9,451 5,344 (3,599 ) (5,359 ) 14,255 Total assets 547,053 444,058 367,348 58,788 16,726 539 1,434,512 Cash paid for capital expenditures 5,348 3,386 3,527 — — — 12,261 Three Months Ended September 30, 2016 Revenues $ 170,177 $ 96,252 $ 90,320 $ 21,554 $ — $ (6,531 ) $ 371,772 Depreciation, depletion, and amortization 22,221 7,133 11,555 — — (49 ) 40,860 Operating income (loss) 9,220 5,226 5,970 (4,696 ) (3,326 ) (3,641 ) 8,753 Total assets 657,276 503,460 382,098 40,760 16,288 6,172 1,606,054 Cash paid for capital expenditures 4,824 11,313 2,251 — — — 18,388 Nine Months Ended September 30, 2017 Revenues $ 420,445 $ 314,051 $ 241,464 $ 61,177 $ — $ (16,365 ) $ 1,020,772 Depreciation, depletion, and amortization 58,469 25,627 30,152 — — (117 ) 114,131 Operating income (loss) 4,926 (17,632 ) 18,321 4,208 (11,055 ) (16,668 ) (17,900 ) Total assets 547,053 444,058 367,348 58,788 16,726 539 1,434,512 Cash paid for capital expenditures 9,204 7,436 8,725 — — — 25,365 Nine Months Ended September 30, 2016 Revenues $ 478,684 $ 299,336 $ 263,269 $ 65,494 $ — $ (21,560 ) $ 1,085,223 Depreciation, depletion, and amortization 51,913 19,932 41,367 — — (115 ) 113,097 Operating income (loss) 17,474 20,919 2,497 (3,766 ) (10,325 ) (11,310 ) 15,489 Total assets 657,276 503,460 382,098 40,760 16,288 6,172 1,606,054 Cash paid for capital expenditures 12,038 13,801 4,780 — — — 30,619 ____________________ (1) The Coal - WMLP segment recorded revenues of $5.4 million and $16.4 million for intersegment revenues to the Coal - U.S. segment for the three and nine months ended September 30, 2017 , respectively, and $6.5 million and $21.6 million for the three and nine months ended September 30, 2016 , respectively. Eliminations for intersegment revenues and cost of sales are presented within the Corporate segment.

CONTINGENCIES

CONTINGENCIES	9 Months Ended
	Sep. 30, 2017
Commitments and Contingencies Disclosure [Abstract]
CONTINGENCIES	15. CONTINGENCIES Litigation There have been no material changes in our litigation since December 31, 2016 . For additional information, refer to Note 20. Commitments and Contingencie s to the consolidated financial statements of our 2016 Form 10-K. A loss contingency for the 2013 breach of a water containment pond at our Obed mine in Canada remains probable and reasonably estimable. The previous owner, Sherritt International Corporation, continues to fully indemnify us for the actual cost of the remediation as well as the costs of compliance with any regulatory orders, including any fees, fines, or judgments resulting from the water release. As of September 30, 2017 , the Company has recorded $2.4 million in Other current liabilities for the estimated costs of remediation work and a corresponding amount in Receivables - Other to reflect the indemnification by the prior owner.

SUBSEQUENT EVENTS

SUBSEQUENT EVENTS	9 Months Ended
	Sep. 30, 2017
Subsequent Events [Abstract]
SUBSEQUENT EVENTS	16. SUBSEQUENT EVENTS We executed an Assignment and Assumption Agreement with an effective date of October 1, 2017 with the counterparties to our ROVA power purchase and sale contracts, in which, for a settlement payment of approximately $10.1 million , we were released from our power purchase and sales contracts and the counterparty to the purchase contracts has assumed our position in the power sales contract. As a result of this transaction, we are no longer a party to either of these derivative arrangements. In the fourth quarter of 2017, this transaction will result in a charge of $4.6 million and we will recognize $14.4 million of previously deferred revenue related to the straight line recognition of capacity payments from the power sales agreement. Also, in the fourth quarter of 2017 we have received proceeds net of settlement payments from our posted collateral of $6.2 million and also released $7.5 million in outstanding letters of credit on our Revolver . On August 2, 2017 we executed a sales agreement to sell all of the assets that comprise ROVA for $5.0 million in cash which closed on October 20, 2017. Pursuant to the transaction, we retained the related $2.7 million reclamation liability. No additional asset impairment was taken as a result of prior year impairments. On October 30, 2017, we executed a twelfth amendment to our Revolver as described in Item 5. Other Information . The Company has evaluated subsequent events in accordance with ASC 855, Subsequent Events , through the filing date of this Quarterly Report, and determined that no events have occurred that have not been disclosed elsewhere in the notes to the consolidated financial statements (unaudited) that would require adjustments to disclosures in the consolidated financial statements (unaudited).

BASIS OF PRESENTATION Basis of

BASIS OF PRESENTATION Basis of Presentation (Policies)	9 Months Ended
	Sep. 30, 2017
Accounting Policies [Abstract]
Consolidation Policy	The consolidated financial statements of the Company have been prepared in accordance with United States Generally Accepted Accounting Principles (“GAAP”) and require the use of management’s estimates. The financial information contained in this Quarterly Report on Form 10-Q (“Quarterly Report”) is unaudited, but reflects all adjustments which, in the opinion of management, are necessary for a fair presentation of the financial information for the periods shown. Such adjustments are of a normal recurring nature. Certain prior period amounts have been reclassified to conform to current period presentation. The results of operations for the nine months ended September 30, 2017 are not necessarily indicative of results to be expected for the year ending December 31, 2017 . These unaudited quarterly consolidated financial statements should be read in conjunction with the audited consolidated financial statements and notes to the consolidated financial statements included in the Company’s Annual Report on Form 10-K for the year ended December 31, 2016 (“ 2016 Form 10-K”).
Recently Issued Accounting Pronouncements	Recently Issued Accounting Pronouncements In February 2016, the Financial Accounting Standards Board (“FASB”) issued Accounting Standards Update (“ASU”) 2016-02, Leases (Topic 842) which requires companies leasing assets to recognize on their balance sheet a liability to make lease payments (the lease liability) and a right-of-use asset representing its right to use the underlying asset for the lease term on contracts longer than one year. The lessee is permitted to make an accounting policy election to not recognize lease assets and lease liabilities for short-term leases. How leases are recorded on the balance sheet represents a significant change from previous GAAP guidance as described in Accounting Standards Codification (“ASC”) Topic 840, Leases. ASU 2016-02 maintains a distinction between finance leases and operating leases similar to the distinction under previous lease guidance for capital leases and operating leases. The impact of leases reported in the Company’s operating results and statement of cash flows are expected to be similar to previous GAAP. ASU 2016-02 is effective for fiscal years beginning after December 15, 2018, and early adoption is permitted. Adoption of the new lease accounting standard will require the Company to apply the new standard to the earliest period using a modified retrospective approach. The Company is currently in the process of evaluating the impact of the new standard, including the evaluation of the impact, if any, on changes to business processes, systems and controls to support recognition and disclosure under the new guidance, however, at this time is unable to determine the impact this standard will have on the financial statements and related disclosures. In January 2016, the FASB issued ASU 2016-01, Financial Instruments - Overall (Subtopic 825-10): Recognition and Measurement of Financial Assets and Financial Liabilities which updates certain aspects of recognition, measurement, presentation and disclosure of financial instruments. This standard is effective for interim and annual periods beginning after December 15, 2017. We anticipate adopting this ASU on January 1, 2018 will have an immaterial impact to the financial statements including reclassification of accumulated other comprehensive income for available-for-sale securities into equity at January 1, 2018, and future changes to the fair value of available-for-sale securities will be recognized in the income statement. In May 2014, the FASB issued ASU 2014-09, Revenue from Contracts with Customers which was issued as a new Topic, ASC Topic 606. The new revenue recognition standard supersedes all existing revenue recognition guidance. Under this ASU, an entity should recognize revenue when it transfers promised goods or services to customers in an amount that reflects the consideration to which the entity expects to be entitled in exchange for those goods or services. ASU 2015-14, issued in August 2015, deferred the effective date of ASU 2014-09 to the first quarter of 2018, with early adoption permitted in the first quarter of 2017. The Company intends to adopt the amended guidance as of January 1, 2018. In March, April, May, and December 2016, the FASB issued the following updates, respectively, to provide supplemental adoption guidance and clarification to ASU 2014-09. These standards must be adopted concurrently upon the adoption of ASU 2014-09. We are currently evaluating the potential effects of adopting the provisions of these updates. • ASU 2016-08, Revenue from Contracts with Customers: Principal versus Agent Considerations (Reporting Revenue Gross versus Net). • ASU 2016-10, Revenue from Contracts with Customers: Identifying Performance Obligations and Licensing. • ASU 2016-12, Revenue from Contracts with Customers: Narrow-Scope Improvements and Practical Expedients. • ASU 2016-19, Technical Corrections and Improvements. We have established an implementation team to execute a multi-phase plan to adopt the requirements of the new standard. The team is in the process of finalizing its conclusions on how the guidance will be applied to all coal sales contracts comprising greater than half of our consolidated revenues. The team is also evaluating the expanded disclosures required by the new standard and reviewing our processes and internal controls over financial reporting to ensure the appropriate information will be available for these disclosures. No changes will be required to our system capabilities to obtain the appropriate information. Under the new standard, companies may use either of the following transition methods: (i) a full retrospective approach reflecting the application of the standard in each prior reporting period with the option to elect certain practical expedients; or (ii) a modified retrospective approach with the cumulative effect of initially adopting ASU 2014-09 recognized at the date of adoption (which includes additional footnote disclosures). We will be adopting the standard under the full retrospective approach. Based on our implementation team’s analyses, we believe the implementation of the new standard will have a material impact on our consolidated financial statements for sales contracts in which we are entitled to payments from customers to reimburse our costs incurred during final reclamation. Under current GAAP, as these amounts are not fixed and determinable until they are incurred, we have been precluded from recognizing revenue until the costs have been incurred during final reclamation. However, under ASC Topic 606, these payments from customers constitute variable consideration and therefore must be estimated at contract inception and recognized as revenue as we satisfy our performance obligations of delivering coal to the customer. This will ultimately result in a significant acceleration of revenue, most of which will be recognized as a transition adjustment as of January 1, 2016. The implementation team is currently reviewing the models to quantify the exact amount of the transition adjustment and related impact to revenues for the years ended December 31, 2017 and 2016.

ACQUISITION (Tables)

ACQUISITION (Tables) - San Juan Coal Company	9 Months Ended
	Sep. 30, 2017
Business Acquisition [Line Items]
Summary of purchase consideration and allocation of purchase consideration	The allocation of the purchase consideration follows (in millions): Purchase price: Cash paid $ 121.0 Allocation of purchase price: Assets: Inventories $ 8.8 Total current assets 8.8 Land and mineral rights 143.9 Plant and equipment 74.6 Other assets 1.3 Total assets 228.6 Liabilities: Trade payables and other accrued liabilities 13.4 Production taxes 2.0 Asset retirement obligations 0.7 Total current liabilities 16.1 Asset retirement obligations, less current portion 43.5 Postretirement medical benefits 1.9 Deferred income taxes 46.1 Total liabilities 107.6 Net fair value $ 121.0
Summary of pro forma information	The following unaudited pro forma information has been prepared for illustrative purposes only and assumes the San Juan Acquisition occurred on January 1, 2016. The unaudited pro forma results have been prepared based on estimates and assumptions, which the Company believes are reasonable, however, they are not necessarily indicative of the consolidated results of operations had the acquisitions occurred on the dates indicated above, or of future results of operations. Nine Months Ended September 30, 2016 (In thousands, except per share data) Revenues As reported $ 1,085,223 Pro forma (unaudited) 1,111,498 Operating income As reported $ 15,489 Pro forma (unaudited) 16,584 Net loss applicable to common shareholders As reported $ (19,550 ) Pro forma (unaudited) (19,125 ) Net loss per share applicable to common shareholders (basic and diluted) As reported $ (1.06 ) Pro forma (unaudited) (1.04 )

VARIABLE INTEREST ENTITY (Table

VARIABLE INTEREST ENTITY (Tables)	9 Months Ended
	Sep. 30, 2017
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Schedule of Variable Interest Entities	The following table presents the carrying amounts, after eliminating the effect of intercompany transactions, included in the Consolidated Balance Sheets that are for the use of or are the obligation of WSJ: September 30, 2017 December 31, 2016 (In thousands) Assets $ 215,230 $ 268,910 Liabilities 180,559 243,884 Net carrying amount $ 34,671 $ 25,026

INVENTORIES (Tables)

INVENTORIES (Tables)	9 Months Ended
	Sep. 30, 2017
Inventory Disclosure [Abstract]
Inventories	Inventories consisted of the following: September 30, 2017 December 31, 2016 (In thousands) Coal stockpiles $ 36,013 $ 44,692 Coal fuel inventories 1,338 6,816 Materials and supplies 76,669 77,628 Reserve for obsolete inventory (3,844 ) (3,621 ) Total $ 110,176 $ 125,515

RESTRICTED INVESTMENTS AND BO27

RESTRICTED INVESTMENTS AND BOND COLLATERAL (Tables)	9 Months Ended
	Sep. 30, 2017
Disclosure Restricted Investments and Bond Collateral [Abstract]
Carrying value and estimated fair value of restricted investments and bond collateral	The Company’s carrying value and estimated fair value of its restricted investments at September 30, 2017 were as follows: Restricted Investments and Bond Collateral Reclamation Deposits Total Restricted Investments (In thousands) Cash and cash equivalents $ 65,441 $ 3,443 $ 68,884 Time deposits 2,467 — 2,467 Available-for-sale 79,505 73,493 152,998 $ 147,413 $ 76,936 $ 224,349 The Company’s carrying value and estimated fair value of its restricted investments at December 31, 2016 were as follows: Restricted Investments and Bond Collateral Reclamation Deposits Total Restricted Investments (In thousands) Cash and cash equivalents $ 66,860 $ 2,673 $ 69,533 Time deposits 2,473 — 2,473 Available-for-sale 75,580 71,689 147,269 $ 144,913 $ 74,362 $ 219,275
Amortized cost, gross unrealized holding gains and losses and fair value of available-for-sale securities	The cost basis, gross unrealized holding gains and losses, and fair value of available-for-sale securities at September 30, 2017 were as follows: Restricted Investments and Bond Collateral Reclamation Deposits Total Restricted Investments (In thousands) Cost basis $ 79,724 $ 73,470 $ 153,194 Gross unrealized holding gains 520 624 1,144 Gross unrealized holding losses (739 ) (601 ) (1,340 ) Fair value $ 79,505 $ 73,493 $ 152,998 The cost basis, gross unrealized holding gains and losses, and fair value of available-for-sale securities at December 31, 2016 were as follows: Restricted Investments and Bond Collateral Reclamation Deposits Total Restricted Investments (In thousands) Cost basis $ 76,558 $ 72,381 $ 148,939 Gross unrealized holding gains 251 453 704 Gross unrealized holding losses (1,229 ) (1,145 ) (2,374 ) Fair value $ 75,580 $ 71,689 $ 147,269

LINES OF CREDIT AND DEBT (Table

LINES OF CREDIT AND DEBT (Tables)	9 Months Ended
	Sep. 30, 2017
Debt Disclosure [Abstract]
Outstanding lines of credit and long-term debt	The Company and its subsidiaries are subject to the following debt arrangements: Total Debt Outstanding September 30, 2017 December 31, 2016 (In thousands) 8.75% Notes $ 350,000 $ 350,000 Term Loan 321,417 323,883 San Juan Loan 66,230 95,000 WMLP Term Loan 311,628 306,189 Revolver 10,540 — WMLP Revolver — — Capital lease obligations 36,736 55,061 Other debt 4,512 16,464 Total debt 1,101,063 1,146,597 Less debt discount and issuance costs, net (29,915 ) (37,531 ) Less current installments (49,712 ) (86,272 ) Long-term debt, less current installments $ 1,021,436 $ 1,022,794
Contractual maturities of all long-term debt	The following table presents remaining aggregate contractual debt maturities of all long-term debt as of September 30, 2017 (in thousands): Debt Held by WMLP All Other Debt Total Debt Outstanding 2017 $ 1,660 $ 30,572 $ 32,232 2018 315,804 18,852 334,656 2019 4,105 15,439 19,544 2020 1,694 338,571 340,265 2021 1,586 21,164 22,750 Thereafter 1,616 350,000 351,616 Total debt $ 326,465 $ 774,598 $ 1,101,063

POSTRETIREMENT MEDICAL BENEFI29

POSTRETIREMENT MEDICAL BENEFITS AND PENSION (Tables)	9 Months Ended
	Sep. 30, 2017
Postretirement Medical Benefits
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Components of net periodic benefit cost	The components of net periodic postretirement medical benefit cost are as follows: Three Months Ended September 30, Nine Months Ended September 30, 2017 2016 2017 2016 (In thousands) Components of net periodic benefit cost: Service cost $ 793 $ 763 $ 2,380 $ 2,507 Interest cost 3,197 3,075 9,590 9,278 Amortization of deferred items 964 368 2,893 891 Total net periodic benefit cost $ 4,954 $ 4,206 $ 14,863 $ 12,676 The following table shows the net periodic postretirement medical benefit costs that relate to current and former mining operations: Three Months Ended September 30, Nine Months Ended September 30, 2017 2016 2017 2016 (In thousands) Former mining operations $ 2,305 $ 2,135 $ 6,916 $ 6,405 Current operations 2,649 2,071 7,947 6,271 Total net periodic benefit cost $ 4,954 $ 4,206 $ 14,863 $ 12,676
Pension
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Components of net periodic benefit cost	The Company incurred net periodic benefit costs of providing these pension benefits as follows: Three Months Ended September 30, Nine Months Ended September 30, 2017 2016 2017 2016 (In thousands) Components of net periodic benefit cost: Service cost $ 348 $ 373 $ 1,133 $ 1,242 Interest cost 2,596 2,564 7,855 7,926 Expected return on plan assets (3,643 ) (3,349 ) (10,918 ) (10,390 ) Settlements — 247 269 247 Amortization of deferred items 588 1,294 1,765 3,639 Total net periodic pension cost $ (111 ) $ 1,129 $ 104 $ 2,664

DERIVATIVE INSTRUMENTS (Tables)

DERIVATIVE INSTRUMENTS (Tables)	9 Months Ended
	Sep. 30, 2017
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Schedule of Other Derivatives Not Designated as Hedging Instruments, Statements of Financial Performance and Financial Position, Location	The fair value of outstanding derivative instruments not designated as hedging instruments on the accompanying unaudited Consolidated Balance Sheets was as follows (in thousands): Derivative Instruments Balance Sheet Location September 30, 2017 December 31, 2016 Contracts to purchase power Other current liabilities $ 18,097 $ 13,382 Contracts to purchase power Other liabilities 10,100 18,384 Contract to sell power Other current assets 15,879 10,240 Contract to sell power Other assets 6,829 9,528 The effect of derivative instruments not designated as hedging instruments on the accompanying unaudited Consolidated Statements of Operations was as follows (in thousands): Three Months Ended September 30, Nine Months Ended September 30, Derivative Instruments Statements of Operations Location 2017 2016 2017 2016 Contracts to purchase power Derivative (gain) loss $ (6,812 ) $ 5,442 $ (3,570 ) $ 2,164 Contract to sell power Derivative (gain) loss 2,145 — (3,001 ) — $ (4,667 ) $ 5,442 $ (6,571 ) $ 2,164

FAIR VALUE MEASUREMENTS (Tables

FAIR VALUE MEASUREMENTS (Tables)	9 Months Ended
	Sep. 30, 2017
Fair Value Disclosures [Abstract]
Summary of financial assets at fair value	The table below sets forth, by level, the Company’s financial assets and liabilities that are accounted for at fair value at September 30, 2017 : Quoted Prices in Active Markets for Identical Assets or Liabilities Significant Other Observable Inputs Fair Value Level 1 Level 2 (In thousands) Assets: Contract to sell power included in Other current assets and Other assets $ 22,708 $ — $ 22,708 Available-for-sale investments included in Restricted investments and bond collateral 79,505 79,505 — Available-for-sale investments included in Reclamation deposits 73,493 73,493 — $ 175,706 $ 152,998 $ 22,708 Liabilities: Contracts to purchase power included in Other current liabilities and Other liabilities $ 28,197 $ — $ 28,197 Warrants issued by WMLP included in Other liabilities 316 316 — $ 28,513 $ 316 $ 28,197
Estimated fair values of Company's debt	The estimated fair values of the Company’s debt with fixed and variable interest rates are as follows: Fixed Interest Rate Variable Interest Rate Carrying Value Fair Value Carrying Value Fair Value (In thousands) (In thousands) September 30, 2017 $ 380,583 $ 277,497 $ 690,565 $ 482,551 December 31, 2016 409,362 395,274 699,704 658,557

SHAREHOLDERS' DEFICIT AND ACC32

SHAREHOLDERS' DEFICIT AND ACCUMULATED OTHER COMPREHENSIVE LOSS (Tables)	9 Months Ended
	Sep. 30, 2017
Equity [Abstract]
Changes in Accumulated Other Comprehensive Income by component	The following table reflects the changes in accumulated other comprehensive loss by component: Pension Postretirement medical benefits Unrealized gains and losses on available-for-sale securities, net Foreign currency translation adjustment Tax effect of other comprehensive income gains Accumulated other comprehensive income (loss) (In thousands) Balance at December 31, 2016 $ (26,123 ) $ (51,893 ) $ (1,674 ) $ (61,073 ) $ (38,309 ) $ (179,072 ) Other comprehensive income (loss) before reclassifications 189 — 1,184 17,455 (2,503 ) 16,325 Amounts reclassified from accumulated other comprehensive income (loss) 1,765 2,893 290 — — 4,948 Balance at September 30, 2017 $ (24,169 ) $ (49,000 ) $ (200 ) $ (43,618 ) $ (40,812 ) $ (157,799 )
Reclassifications out of Accumulated Other Comprehensive Income for the period	The following table reflects the reclassifications out of accumulated other comprehensive loss for the three and nine months ended September 30, 2017 (in thousands): Details about accumulated other comprehensive loss components Amount reclassified from accumulated other comprehensive loss Affected line items in the statements where presented Three Months Ended September 30, 2017 Nine Months Ended September 30, 2017 Available-for-sale securities Realized (gains) and losses on available-for-sale securities $ (4 ) $ 290 Other (loss) income Amortization of defined benefit pension items Prior service costs $ 2 $ 6 Cost of sales and Selling and administrative Actuarial losses 581 1,759 Cost of sales and Selling and administrative Total $ 583 $ 1,765 Amortization of postretirement medical items Prior service costs $ (159 ) $ (477 ) Cost of sales and Selling and administrative Actuarial losses 1,123 3,370 Cost of sales and Selling and administrative Total $ 964 $ 2,893

SHARE-BASED COMPENSATION (Table

SHARE-BASED COMPENSATION (Tables)	9 Months Ended
	Sep. 30, 2017
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Compensation cost arising from share-based arrangements	The Company recognized compensation expense from share-based arrangements shown in the following table: Three Months Ended September 30, Nine Months Ended September 30, 2017 2016 2017 2016 (In thousands) Recognition of value of restricted stock units and cash units over vesting period; and issuance of stock $ 1,366 $ 1,391 $ 3,846 $ 3,733 Contributions of stock to the Company’s 401(k) plan — — — 2,192 Total share-based compensation expense $ 1,366 $ 1,391 $ 3,846 $ 5,925
Summary of Restricted Stock Unit activity	A summary of outstanding restricted stock units as of September 30, 2017 is as follows: Units Weighted Average Grant-Date Fair Value Unamortized Compensation Expense (In thousands) Non-vested at December 31, 2016 700,500 $ 15.91 Granted 713,238 3.94 Vested (246,724 ) 18.34 Forfeited (44,870 ) 8.31 Non-vested at September 30, 2017 1,122,144 $ 8.80 $ 4,568

EARNINGS PER SHARE (Tables)

EARNINGS PER SHARE (Tables)	9 Months Ended
	Sep. 30, 2017
Earnings Per Share [Abstract]
Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share	The table below shows the number of shares that were excluded from the calculation of diluted loss per share because their inclusion would be anti-dilutive to the calculation: Three Months Ended September 30, Nine Months Ended September 30, 2017 2016 2017 2016 (In thousands) Restricted stock units and stock options 1,201 853 1,201 853

SEGMENT INFORMATION (Tables)

SEGMENT INFORMATION (Tables)	9 Months Ended
	Sep. 30, 2017
Segment Reporting [Abstract]
Summarized financial information by segment	Summarized financial information by segment is as follows: Coal - U.S. (1) Coal - Canada Coal - WMLP (1) Power Heritage Corporate Consolidated (In thousands) Three Months Ended September 30, 2017 Revenues $ 142,040 $ 115,688 $ 85,607 $ 20,070 $ — $ (5,394 ) $ 358,011 Depreciation, depletion, and amortization 19,826 8,590 9,691 — — (41 ) 38,066 Operating income (loss) 7,212 1,206 9,451 5,344 (3,599 ) (5,359 ) 14,255 Total assets 547,053 444,058 367,348 58,788 16,726 539 1,434,512 Cash paid for capital expenditures 5,348 3,386 3,527 — — — 12,261 Three Months Ended September 30, 2016 Revenues $ 170,177 $ 96,252 $ 90,320 $ 21,554 $ — $ (6,531 ) $ 371,772 Depreciation, depletion, and amortization 22,221 7,133 11,555 — — (49 ) 40,860 Operating income (loss) 9,220 5,226 5,970 (4,696 ) (3,326 ) (3,641 ) 8,753 Total assets 657,276 503,460 382,098 40,760 16,288 6,172 1,606,054 Cash paid for capital expenditures 4,824 11,313 2,251 — — — 18,388 Nine Months Ended September 30, 2017 Revenues $ 420,445 $ 314,051 $ 241,464 $ 61,177 $ — $ (16,365 ) $ 1,020,772 Depreciation, depletion, and amortization 58,469 25,627 30,152 — — (117 ) 114,131 Operating income (loss) 4,926 (17,632 ) 18,321 4,208 (11,055 ) (16,668 ) (17,900 ) Total assets 547,053 444,058 367,348 58,788 16,726 539 1,434,512 Cash paid for capital expenditures 9,204 7,436 8,725 — — — 25,365 Nine Months Ended September 30, 2016 Revenues $ 478,684 $ 299,336 $ 263,269 $ 65,494 $ — $ (21,560 ) $ 1,085,223 Depreciation, depletion, and amortization 51,913 19,932 41,367 — — (115 ) 113,097 Operating income (loss) 17,474 20,919 2,497 (3,766 ) (10,325 ) (11,310 ) 15,489 Total assets 657,276 503,460 382,098 40,760 16,288 6,172 1,606,054 Cash paid for capital expenditures 12,038 13,801 4,780 — — — 30,619 ____________________ (1) The Coal - WMLP segment recorded revenues of $5.4 million and $16.4 million for intersegment revenues to the Coal - U.S. segment for the three and nine months ended September 30, 2017 , respectively, and $6.5 million and $21.6 million for the three and nine months ended September 30, 2016 , respectively. Eliminations for intersegment revenues and cost of sales are presented within the Corporate segment.

ACQUISITION - Narrative (Detail

ACQUISITION - Narrative (Details) - USD ($)	Jan. 31, 2016	Dec. 31, 2016
San Juan Coal Company
Business Acquisition [Line Items]
Cash paid	$ 121,000,000	$ 121,000,000
Loan from NM Capital Utility Corporation | Term Notes
Business Acquisition [Line Items]
Senior secured notes	$ 125,000,000

ACQUISITION - Summary of purcha

ACQUISITION - Summary of purchase consideration and allocation of purchase consideration (Details) - San Juan Coal Company - USD ($) $ in Millions	Jan. 31, 2016	Dec. 31, 2016
Purchase Price:
Cash paid	$ 121	$ 121
Assets:
Inventories		8.8
Total current assets		8.8
Land and mineral rights		143.9
Plant and equipment		74.6
Other assets		1.3
Total Assets		228.6
Liabilities:
Trade payables and other accrued liabilities		13.4
Production taxes		2
Asset retirement obligations		0.7
Total current liabilities		16.1
Asset retirement obligations, less current portion		43.5
Postretirement medical benefits		1.9
Deferred income taxes		46.1
Total Liabilities		107.6
Net fair value		$ 121

ACQUISITION - Summary of Pro Fo

ACQUISITION - Summary of Pro Forma Information (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Revenues
As reported	$ 358,011	$ 371,772	$ 1,020,772	$ 1,085,223
Pro forma (unaudited)				1,111,498
Operating income
As reported	14,255	8,753	(17,900)	15,489
Pro forma (unaudited)				16,584
Net loss applicable to common shareholders
As reported	$ (19,222)	$ (18,368)	$ (106,409)	(19,550)
Pro forma (unaudited)				$ (19,125)
Net loss per share applicable to common shareholders (basic and diluted)
As reported, (in dollars per share)	$ (1.03)	$ (0.99)	$ (5.70)	$ (1.06)
Pro forma (unaudited) (in dollars per share)				$ (1.04)

VARIABLE INTEREST ENTITY (Detai

VARIABLE INTEREST ENTITY (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2017	Dec. 31, 2016
Variable Interest Entity [Line Items]
Ownership percentage in Constitution (percent)	100.00%
Variable Interest Entity, Primary Beneficiary
Variable Interest Entity [Line Items]
Assets	$ 215,230	$ 268,910
Liabilities	180,559	243,884
Net carrying amount	$ 34,671	$ 25,026

INVENTORIES (Detail)

INVENTORIES (Detail) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Inventory Disclosure [Abstract]
Coal stockpiles	$ 36,013	$ 44,692
Coal fuel inventories	1,338	6,816
Materials and supplies	76,669	77,628
Reserve for obsolete inventory	(3,844)	(3,621)
Total	$ 110,176	$ 125,515

RESTRICTED INVESTMENTS AND BO41

RESTRICTED INVESTMENTS AND BOND COLLATERAL - Carrying Value and Estimated Fair Value of Restricted Investments and Bond Collateral (Detail) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Investment [Line Items]
Restricted investments and bond collateral	$ 224,349	$ 219,275
Restricted Investments and Bond Collateral
Investment [Line Items]
Cash and cash equivalents	65,441	66,860
Time deposits	2,467	2,473
Available-for-sale	79,505	75,580
Restricted investments and bond collateral	147,413	144,913
Reclamation Deposits
Investment [Line Items]
Cash and cash equivalents	3,443	2,673
Time deposits	0	0
Available-for-sale	73,493	71,689
Restricted investments and bond collateral	76,936	74,362
Restricted Investments
Investment [Line Items]
Cash and cash equivalents	68,884	69,533
Time deposits	2,467	2,473
Available-for-sale	152,998	147,269
Restricted investments and bond collateral	$ 224,349	$ 219,275

RESTRICTED INVESTMENTS AND BO42

RESTRICTED INVESTMENTS AND BOND COLLATERAL - Amortized Cost, Gross Unrealized Holding Gains and Losses and Fair Value of Held-to-Maturity Securities (Detail) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Restricted Investments and Bond Collateral
Schedule of Available-for-sale Securities [Line Items]
Cost basis	$ 79,724	$ 76,558
Gross unrealized holding gains	520	251
Gross unrealized holding losses	(739)	(1,229)
Fair value	79,505	75,580
Reclamation Deposits
Schedule of Available-for-sale Securities [Line Items]
Cost basis	73,470	72,381
Gross unrealized holding gains	624	453
Gross unrealized holding losses	(601)	(1,145)
Fair value	73,493	71,689
Restricted Investments
Schedule of Available-for-sale Securities [Line Items]
Cost basis	153,194	148,939
Gross unrealized holding gains	1,144	704
Gross unrealized holding losses	(1,340)	(2,374)
Fair value	$ 152,998	$ 147,269

DEBT AND LINES OF CREDIT - Outs

DEBT AND LINES OF CREDIT - Outstanding Lines of Credit and Debt (Detail) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Debt Instrument [Line Items]
Total debt	$ 1,101,063	$ 1,146,597
Less debt discount and issuance costs, net	(29,915)	(37,531)
Less current installments	(49,712)	(86,272)
Long-term debt, less current installments	1,021,436	1,022,794
Capital lease obligations
Debt Instrument [Line Items]
Total debt	36,736	55,061
Other
Debt Instrument [Line Items]
Total debt	4,512	16,464
Senior secured notes due 2022 | Senior Notes
Debt Instrument [Line Items]
Total debt	$ 350,000	350,000
Stated interest rate (percent)	8.75%
Term loan facility due 2020 | Term Notes
Debt Instrument [Line Items]
Total debt	$ 321,417	323,883
Stated interest rate (percent)	7.796%
San Juan Loan | Term Notes
Debt Instrument [Line Items]
Total debt	$ 66,230	95,000
Stated interest rate (percent)	7.25%
WML Term Debt Due 2018 | Term Notes
Debt Instrument [Line Items]
Total debt	$ 311,628	306,189
Revolving line of credit | Revolving line of credit
Debt Instrument [Line Items]
Total debt	10,540	0
WMLP revolving line of credit | Revolving line of credit
Debt Instrument [Line Items]
Total debt	$ 0	$ 0

DEBT AND LINES OF CREDIT - Cont

DEBT AND LINES OF CREDIT - Contractual Maturities of Long Term Debt (Details) $ in Thousands	Sep. 30, 2017USD ($)
Debt Instrument [Line Items]
2,017	$ 32,232
2,018	334,656
2,019	19,544
2,020	340,265
2,021	22,750
Thereafter	351,616
Total	1,101,063
Debt Held by WMLP
Debt Instrument [Line Items]
2,017	1,660
2,018	315,804
2,019	4,105
2,020	1,694
2,021	1,586
Thereafter	1,616
Total	326,465
All Other Debt
Debt Instrument [Line Items]
2,017	30,572
2,018	18,852
2,019	15,439
2,020	338,571
2,021	21,164
Thereafter	350,000
Total	$ 774,598

DEBT AND LINES OF CREDIT - Addi

DEBT AND LINES OF CREDIT - Additional Information (Detail) - USD ($)	Nov. 14, 2017	Oct. 27, 2017	Jul. 28, 2017	Sep. 30, 2017	Sep. 30, 2017	Sep. 30, 2016	Dec. 31, 2016	Jan. 31, 2016
Debt Instrument [Line Items]
Debt and Capital Lease Obligations				$ 1,101,063,000	$ 1,101,063,000		$ 1,146,597,000
Non-cash interest expense					6,981,000	$ 6,879,000
Capital lease obligations incurred					700,000
Revolving line of credit
Debt Instrument [Line Items]
Maximum borrowing capacity				50,000,000	50,000,000
Remaining borrowing capacity				16,742,869	16,742,869
Line of credit outstanding				9,880,000	9,880,000
Borrowing base restrictions				(12,800,000)	(12,800,000)
Outstanding letters of credit				10,540,147	10,540,147
Term loan facility due 2020 | Term Notes
Debt Instrument [Line Items]
Debt and Capital Lease Obligations				$ 321,417,000	$ 321,417,000		323,883,000
Stated interest rate (percent)				7.796%	7.796%
Senior secured notes due 2022 | Senior Notes
Debt Instrument [Line Items]
Debt and Capital Lease Obligations				$ 350,000,000	$ 350,000,000		350,000,000
Stated interest rate (percent)				8.75%	8.75%
San Juan Loan | Term Notes
Debt Instrument [Line Items]
Debt and Capital Lease Obligations				$ 66,230,000	$ 66,230,000		95,000,000
Stated interest rate (percent)				7.25%	7.25%
Senior secured notes								$ 125,000,000
Interest rate at period end (percent)				10.57%	10.57%
WML Term Debt Due 2018
Debt Instrument [Line Items]
Maximum capacity to make distributions				$ 15,000,000	$ 15,000,000
Consolidated net leverage ratio (in excess at June 30,2017)				3.75	3.75
Fixed charge coverage ratio (below at June 30, 2017)				1	1
Payments of capital distributions					$ 14,800,000
Minimum liquidity requirement				$ 7,500,000	7,500,000
WML Term Debt Due 2018 | Term Notes
Debt Instrument [Line Items]
Debt and Capital Lease Obligations				$ 311,628,000	$ 311,628,000		$ 306,189,000
Interest rate at period end (percent)				9.80%	9.80%
Non-cash interest expense				$ 2,300,000	$ 7,000,000
Debt outstanding				288,600,000	288,600,000
Accrued paid-in-kind interest				23,100,000	23,100,000
Seasonal Increase to Borrowing Capacity | Revolving line of credit
Debt Instrument [Line Items]
Maximum borrowing capacity				60,000,000	60,000,000
USD Denominated Sub-facility | Revolving line of credit
Debt Instrument [Line Items]
Maximum borrowing capacity				30,000,000	30,000,000
USD Denominated Sub-facility with Seasonal Increase | Revolving line of credit
Debt Instrument [Line Items]
Maximum borrowing capacity				35,000,000	35,000,000
CAD-Denominated Sub-facility | Revolving line of credit
Debt Instrument [Line Items]
Maximum borrowing capacity				20,000,000	20,000,000
CAD Denominated Sub-facility with Seasonal Increase | Revolving line of credit
Debt Instrument [Line Items]
Maximum borrowing capacity				25,000,000	25,000,000
WMLP and subsidiaries | Revolving line of credit
Debt Instrument [Line Items]
Maximum borrowing capacity				15,000,000	15,000,000
Remaining borrowing capacity				14,800,000	14,800,000
WMLP and subsidiaries | Letter of Credit
Debt Instrument [Line Items]
Maximum borrowing capacity				$ 10,000,000	$ 10,000,000
London Interbank Offered Rate (LIBOR) | WML Term Debt Due 2018 | Term Notes
Debt Instrument [Line Items]
Basis spread on variable rate (percent)					8.50%
Debt instrument, floor interest rate (percent)				0.75%	0.75%
Interest rate at period end (percent)				1.30%	1.30%
One-month LIBOR | Term loan facility due 2020 | Term Notes
Debt Instrument [Line Items]
Basis spread on variable rate (percent)					6.50%
Percentage added to the base rate before including the basis spread (percent)					1.00%
Two-month LIBOR | Term loan facility due 2020 | Term Notes
Debt Instrument [Line Items]
Basis spread on variable rate (percent)					6.50%
Three-month LIBOR | Term loan facility due 2020 | Term Notes
Debt Instrument [Line Items]
Basis spread on variable rate (percent)					6.50%
Six-month LIBOR | Term loan facility due 2020 | Term Notes
Debt Instrument [Line Items]
Basis spread on variable rate (percent)					6.50%
Federal Funds Rate | Term loan facility due 2020 | Term Notes
Debt Instrument [Line Items]
Percentage added to the base rate before including the basis spread (percent)					0.05%
Federal Funds Rate plus 0.05% | Term loan facility due 2020 | Term Notes
Debt Instrument [Line Items]
Basis spread on variable rate (percent)					5.50%
One-month LIBOR plus 1% | Term loan facility due 2020 | Term Notes
Debt Instrument [Line Items]
Basis spread on variable rate (percent)					5.50%
Minimum | WML Term Debt Due 2018 | Term Notes
Debt Instrument [Line Items]
Paid-in-kind interest (percent)					1.00%
Maximum | WML Term Debt Due 2018 | Term Notes
Debt Instrument [Line Items]
Paid-in-kind interest (percent)					3.00%
Common Units
Debt Instrument [Line Items]
Distribution declared (dollars per unit)			$ 0.1333
Common Units | Subsequent Event
Debt Instrument [Line Items]
Distribution declared (dollars per unit)		$ 0.1155
Decrease in distribution declared (dollars per unit)		$ 0.0178
Forecast
Debt Instrument [Line Items]
Quarterly Aggregate Distribution to Unit Holders	$ 200,000

POSTRETIREMENT MEDICAL BENEFI46

POSTRETIREMENT MEDICAL BENEFITS AND PENSION - Postretirement Medicial Benefit Obligations Balance Sheet Disclosures (Details) - Postretirement Medical Benefits - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Components of net periodic benefit cost:
Service cost	$ 793	$ 763	$ 2,380	$ 2,507
Interest cost	3,197	3,075	9,590	9,278
Amortization of deferred items	964	368	2,893	891
Total net periodic benefit cost	$ 4,954	$ 4,206	$ 14,863	$ 12,676

POSTRETIREMENT MEDICAL BENEFI47

POSTRETIREMENT MEDICAL BENEFITS AND PENSION - Postretirement Medical Benefit Obligations Income Statement Disclosures (Details) - Postretirement Medical Benefits - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Net periodic postretirement medical benefit costs relating to current and former mining operations:
Total net periodic benefit cost	$ 4,954	$ 4,206	$ 14,863	$ 12,676
Former Mining Operations
Net periodic postretirement medical benefit costs relating to current and former mining operations:
Total net periodic benefit cost	2,305	2,135	6,916	6,405
Current Operations
Net periodic postretirement medical benefit costs relating to current and former mining operations:
Total net periodic benefit cost	$ 2,649	$ 2,071	$ 7,947	$ 6,271

POSTRETIREMENT MEDICAL BENEFI48

POSTRETIREMENT MEDICAL BENEFITS AND PENSION - Pension Benefit Disclosures (Details) - Pension - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Service cost	$ 348	$ 373	$ 1,133	$ 1,242
Interest cost	2,596	2,564	7,855	7,926
Expected return on plan assets	(3,643)	(3,349)	(10,918)	(10,390)
Settlements	0	(247)	(269)	(247)
Amortization of deferred items	588	1,294	1,765	3,639
Total net periodic benefit cost	(111)	$ 1,129	104	2,664
Employer contributions during the period			1,100	$ 600
Expected employer contributions to pension plans during the remainder of the year	$ 100		$ 100

DERIVATIVE INSTRUMENTS (Details

DERIVATIVE INSTRUMENTS (Details) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017USD ($)	Sep. 30, 2016USD ($)	Sep. 30, 2017USD ($)$ / MWh	Sep. 30, 2016USD ($)	Dec. 31, 2016USD ($)
Derivative [Line Items]
Gain (loss) on derivative, net	$ 4,667	$ (5,442)	$ 6,571	$ (2,164)
Contract to Sell Power
Derivative [Line Items]
Optional power delivery, price | $ / MWh			15.26
Not Designated as Hedging Instrument | Contract to Purchase Power [Member] | Derivative loss
Derivative [Line Items]
Gain (loss) on derivative, net	(6,812)	5,442	$ (3,570)	2,164
Not Designated as Hedging Instrument | Contract to Sell Power | Derivative loss
Derivative [Line Items]
Gain (loss) on derivative, net	2,145	0	(3,001)	0
Not Designated as Hedging Instrument | Contract to Sell Power | Other current assets
Derivative [Line Items]
Derivative asset	15,879		15,879		$ 10,240
Not Designated as Hedging Instrument | Contract to Sell Power | Other assets
Derivative [Line Items]
Derivative asset	6,829		6,829		9,528
Not Designated as Hedging Instrument | Power Contract | Derivative loss
Derivative [Line Items]
Gain (loss) on derivative, net	(4,667)	$ 5,442	(6,571)	$ 2,164
Not Designated as Hedging Instrument | Power Contract | Other current liabilities
Derivative [Line Items]
Derivative liability	18,097		18,097		13,382
Not Designated as Hedging Instrument | Power Contract | Other liabilities
Derivative [Line Items]
Derivative liability	$ 10,100		$ 10,100		$ 18,384
Minimum | Contract to Sell Power
Derivative [Line Items]
Contracted power price notional amount | $ / MWh			21.33
Minimum | Power Contract
Derivative [Line Items]
Contracted power price notional amount | $ / MWh			41.05
Maximum | Contract to Sell Power
Derivative [Line Items]
Contracted power price notional amount | $ / MWh			24.32
Maximum | Power Contract
Derivative [Line Items]
Contracted power price notional amount | $ / MWh			55.2
Weighted Average | Contract to Sell Power
Derivative [Line Items]
Contracted power price notional amount | $ / MWh			23.79
Weighted Average | Power Contract
Derivative [Line Items]
Contracted power price notional amount | $ / MWh			44.67

FAIR VALUE MEASUREMENTS Summary

FAIR VALUE MEASUREMENTS Summary of Financial Assets at Fair Value (Details) - Fair Value, Measurements, Recurring $ in Thousands	Sep. 30, 2017USD ($)
Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale investments included in Restricted investments and bond collateral	$ 79,505
Available-for-sale investments included in Reclamation deposits	73,493
Available-for-sale investments	152,998
Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale investments included in Restricted investments and bond collateral	0
Available-for-sale investments included in Reclamation deposits	0
Available-for-sale investments	22,708
Fair Value
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale investments included in Restricted investments and bond collateral	79,505
Available-for-sale investments included in Reclamation deposits	73,493
Available-for-sale investments	175,706
Other Current Assets and Other Assets [Member] | Power Contract | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative asset	0
Other Current Assets and Other Assets [Member] | Power Contract | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative asset	22,708
Other Current Assets and Other Assets [Member] | Power Contract | Fair Value
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative asset	22,708
Other current liabilities and other liabilities | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative liability	316
Other current liabilities and other liabilities | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative liability	28,197
Other current liabilities and other liabilities | Fair Value
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative liability	28,513
Other current liabilities and other liabilities | Power Contract | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative liability	0
Other current liabilities and other liabilities | Power Contract | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative liability	28,197
Other current liabilities and other liabilities | Power Contract | Fair Value
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative liability	28,197
Other liabilities | Warrant | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative liability	316
Other liabilities | Warrant | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative liability	0
Other liabilities | Warrant | Fair Value
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative liability	$ 316

FAIR VALUE MEASUREMENTS (Detail

FAIR VALUE MEASUREMENTS (Details) - Significant unobservable inputs, Level 3 - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Carrying Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Debt at fixed interest rate	$ 380,583	$ 409,362
Debt at variable interest rate	690,565	699,704
Fair Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Debt at fixed interest rate	277,497	395,274
Debt at variable interest rate	$ 482,551	$ 658,557

INCOME TAX Income Tax Disclosur

INCOME TAX Income Tax Disclosure (Details) - USD ($) $ / shares in Units, $ in Millions	9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Dec. 31, 2016
Business Acquisition [Line Items]
Decrease to deferred tax assets	$ 47.6
Release of valuation allowance		$ 47.6
Net operating loss carryforward			$ 581.4
Ownership interest percentage, without Board approval, that triggers the stockholder rights plan (percent)	4.75%
Common stock, par value (in dollars per share)	$ 0.01		$ 0.01
Rights Agreement, exercise price per unit (in dollars per unit)	$ 10
San Juan Coal Company
Business Acquisition [Line Items]
Deferred income taxes		$ 47.6
Series A participating preferred stock
Business Acquisition [Line Items]
Fraction of share represented by each right under the Rights Agreement (shares)	0.00010
Preferred stock, par value (in dollars per share)	$ 0.01

SHAREHOLDERS' DEFICIT AND ACC53

SHAREHOLDERS' DEFICIT AND ACCUMULATED OTHER COMPREHENSIVE LOSS - Changes in Accumulated Other Comprehensive Income by component (Details) $ in Thousands	9 Months Ended
	Sep. 30, 2017USD ($)
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance at beginning of period	$ (179,072)
Other comprehensive income before reclassifications	16,325
Amounts reclassified from accumulated other comprehensive income (loss)	4,948
Balance at end of period	(157,799)
Defined benefit plans adjustment | Pension
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance at beginning of period	(26,123)
Other comprehensive income before reclassifications	189
Amounts reclassified from accumulated other comprehensive income (loss)	1,765
Balance at end of period	(24,169)
Defined benefit plans adjustment | Postretirement Medical Benefits
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance at beginning of period	(51,893)
Other comprehensive income before reclassifications	0
Amounts reclassified from accumulated other comprehensive income (loss)	2,893
Balance at end of period	(49,000)
Available for sale securities
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance at beginning of period	(1,674)
Other comprehensive income before reclassifications	1,184
Amounts reclassified from accumulated other comprehensive income (loss)	290
Balance at end of period	(200)
Foreign currency translation adjustment
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance at beginning of period	(61,073)
Other comprehensive income before reclassifications	17,455
Balance at end of period	(43,618)
Tax effect of other comprehensive income gains
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance at beginning of period	(38,309)
Other comprehensive income before reclassifications	(2,503)
Balance at end of period	$ (40,812)

SHAREHOLDERS' DEFICIT AND ACC54

SHAREHOLDERS' DEFICIT AND ACCUMULATED OTHER COMPREHENSIVE LOSS - Reclassifications out of Accumulated Other Comprehensive Income (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
	Sep. 30, 2017	Sep. 30, 2017
Defined benefit plans adjustment | Pension
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Prior service costs	$ 2	$ 6
Actuarial losses	581	1,759
Amortization of defined benefit pension and postretirement medical benefits	583	1,765
Defined benefit plans adjustment | Postretirement Medical Benefits
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Prior service costs	(159)	(477)
Actuarial losses	1,123	3,370
Amortization of defined benefit pension and postretirement medical benefits	964	2,893
Other (loss) income | Unrealized Gains and Losses on Available-for-sale Securities, Net
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Realized (gains) and losses on available-for-sale securities	$ (4)	$ 290

SHARE-BASED COMPENSATION - Comp

SHARE-BASED COMPENSATION - Compensation Expense from Share-Based Arrangements (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016	Dec. 31, 2016
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Recognition of fair value of restricted stock units, stock options, and SARs over vesting period; and issuance of common stock	$ 1,366	$ 1,391	$ 3,846	$ 3,733
Contributions of stock to the Company's 401(k) plan	0	0	0	2,192
Total share-based compensation expense	$ 1,366	$ 1,391	$ 3,846	$ 5,925
Company shares contributed to match employees' contributions to their 401k plans (shares)					342,353

SHARE-BASED COMPENSATION - Gran

SHARE-BASED COMPENSATION - Grants (Details)	9 Months Ended
	Sep. 30, 2017shares
Restricted Stock Units (RSUs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted (units)	713,238
Restricted Stock Units (RSUs) | Vesting based on Service Condition
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted (units)	338,968
Restricted Stock Units (RSUs) | Vesting based on on Service and Market Condition
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted (units)	187,135
Restricted Stock Units (RSUs) | Vesting based on Service and Performance Condition
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted (units)	187,135
Cash Unit
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted (units)	375,658
Cash Unit | Vesting based on Service Condition
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted (units)	157,880
Cash Unit | Vesting based on on Service and Market Condition
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted (units)	108,889
Cash Unit | Vesting based on Service and Performance Condition
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted (units)	108,889

SHARE-BASED COMPENSATION - Summ

SHARE-BASED COMPENSATION - Summary of Restricted Stock Unit Activity (Detail) - Restricted Stock Units (RSUs) - USD ($) $ / shares in Units, $ in Thousands	9 Months Ended
	Sep. 30, 2017	Dec. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Period for recognition of unamortized compensation expense	3 years
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Balance beginning of period (units)	700,500
Granted (units)	713,238
Vested (units)	(246,724)
Forfeited (units)	(44,870)
Balance end of period (units)	1,122,144
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Roll Forward]
Weighted Average Grant Date Fair Value, beginning of period (in USD per share)	$ 15.91
Weighted Average Grant Date Fair Value, Granted (in USD per share)	3.94
Weighted Average Grant Date Fair Value, Vested (in USD per share)	18.34
Weighted Average Grant Date Fair Value, Forfeited (in USD per share)	8.31
Weighted Average Grant Date Fair Value, end of period (in USD per share)	$ 8.80
Unamortized Compensation Expense	$ 4,568

SHARE-BASED COMPENSATION - Cash

SHARE-BASED COMPENSATION - Cash Units (Details) - Cash Unit - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Dec. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation expense	$ 0.3	$ 0.2
Accrued liability related to Cash Units	$ 0.1		$ 0.4

EARNINGS PER SHARE - Antidiluti

EARNINGS PER SHARE - Antidilutive securities excluded from the computation of earnings per share (Details) - shares shares in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Restricted stock units, stock options and SARs
Class of Stock [Line Items]
Shares excluded from diluted shares calculation	1,201	853	1,201	853

SEGMENT INFORMATION - Summarize

SEGMENT INFORMATION - Summarized Financial Information by Segment (Detail) $ in Thousands		3 Months Ended		9 Months Ended
		Sep. 30, 2017USD ($)	Sep. 30, 2016USD ($)	Sep. 30, 2017USD ($)segments	Sep. 30, 2016USD ($)	Dec. 31, 2016USD ($)
Segment Reporting Information [Line Items]
Number of Reportable Segments | segments				6
Revenues		$ 358,011	$ 371,772	$ 1,020,772	$ 1,085,223
Depreciation, depletion and amortization		38,066	40,860	114,131	113,097
Operating income (loss)		14,255	8,753	(17,900)	15,489
Total assets		1,434,512	1,606,054	1,434,512	1,606,054	$ 1,584,909
Capital expenditures		12,261	18,388	25,365	30,619
Coal - U.S. Segment
Segment Reporting Information [Line Items]
Revenues		142,040	170,177	420,445	478,684
Depreciation, depletion and amortization		19,826	22,221	58,469	51,913
Operating income (loss)		7,212	9,220	4,926	17,474
Total assets		547,053	657,276	547,053	657,276
Capital expenditures		5,348	4,824	9,204	12,038
Coal - Canada Segment
Segment Reporting Information [Line Items]
Revenues		115,688	96,252	314,051	299,336
Depreciation, depletion and amortization		8,590	7,133	25,627	19,932
Operating income (loss)		1,206	5,226	(17,632)	20,919
Total assets		444,058	503,460	444,058	503,460
Capital expenditures		3,386	11,313	7,436	13,801
Coal - WMLP Segment
Segment Reporting Information [Line Items]
Revenues	[1]	85,607	90,320	241,464	263,269
Depreciation, depletion and amortization	[1]	9,691	11,555	30,152	41,367
Operating income (loss)	[1]	9,451	5,970	18,321	2,497
Total assets	[1]	367,348	382,098	367,348	382,098
Capital expenditures	[1]	3,527	2,251	8,725	4,780
Power Segment
Segment Reporting Information [Line Items]
Revenues		20,070	21,554	61,177	65,494
Depreciation, depletion and amortization		0	0	0	0
Operating income (loss)		5,344	(4,696)	4,208	(3,766)
Total assets		58,788	40,760	58,788	40,760
Capital expenditures		0	0	0	0
Heritage Segment
Segment Reporting Information [Line Items]
Revenues		0	0	0	0
Depreciation, depletion and amortization		0	0	0	0
Operating income (loss)		(3,599)	(3,326)	(11,055)	(10,325)
Total assets		16,726	16,288	16,726	16,288
Capital expenditures		0	0	0	0
Corporate and Eliminations
Segment Reporting Information [Line Items]
Revenues	[1]	(5,394)	(6,531)	(16,365)	(21,560)
Depreciation, depletion and amortization	[1]	(41)	(49)	(117)	(115)
Operating income (loss)	[1]	(5,359)	(3,641)	(16,668)	(11,310)
Total assets	[1]	539	6,172	539	6,172
Capital expenditures	[1]	$ 0	$ 0	$ 0	$ 0
[1]	The Coal - WMLP segment recorded revenues of $5.4 million and $16.4 million for intersegment revenues to the Coal - U.S. segment for the three and nine months ended September 30, 2017, respectively, and $6.5 million and $21.6 million for the three and nine months ended September 30, 2016, respectively. Eliminations for intersegment revenues and cost of sales are presented within the Corporate segment.

CONTINGENCIES Contingencies (De

CONTINGENCIES Contingencies (Details) $ in Millions	Sep. 30, 2017USD ($)
Other current liabilities
Loss Contingencies [Line Items]
Remediation obligation	$ 2.4

SUBSEQUENT EVENTS Sell price of

SUBSEQUENT EVENTS Sell price of ROVA (Details) - USD ($) $ in Thousands	Oct. 01, 2017	Dec. 31, 2017	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016	Aug. 02, 2017
Subsequent Event [Line Items]
ROVA revenue to be recognized			$ 358,011	$ 371,772	$ 1,020,772	$ 1,085,223
Sale price for assets of ROVA							$ 5,000
Mine reclamation liability							$ 2,700
Subsequent Event
Subsequent Event [Line Items]
Settlement payment for release from ROVA power purchase and sale contracts	$ 10,100
Proceeds net of settlement payments from posted collateral	$ 6,200
Forecast
Subsequent Event [Line Items]
Loss on ROVA contract termination		$ 4,600
ROVA revenue to be recognized		14,400
Revolving line of credit | Revolving line of credit | Subsequent Event
Subsequent Event [Line Items]
Letters of credit released		$ 7,500