WESTMORELAND COAL (WLBAQ) 10-Q 15 May 17 2017 Q1 Quarterly report Financial data

Document and Entity Information

Document and Entity Information - shares	3 Months Ended
	Mar. 31, 2017	May 12, 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	Mar. 31, 2017
Amendment Flag	false
Document Fiscal Year Focus	2,017
Document Fiscal Period Focus	Q1
Current Fiscal Year End Date	--12-31
Entity Filer Category	Accelerated Filer
Entity Common Stock, Shares Outstanding		18,663,214

Consolidated Balance Sheets (Un

Consolidated Balance Sheets (Unaudited) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Current assets:
Cash and cash equivalents	$ 75,438	$ 60,082
Receivables:
Trade	131,124	140,731
Loan and lease receivables	0	5,867
Other	11,053	13,261
Total receivables	142,177	159,859
Inventories	120,298	125,515
Other current assets	24,836	32,258
Total current assets	362,749	377,714
Property, plant and equipment:
Gross property, plant and equipment	1,635,151	1,617,938
Less accumulated depreciation, depletion and amortization	818,032	782,417
Net property, plant and equipment	817,119	835,521
Loan and lease receivables, less current portion	0	44,474
Advanced coal royalties	18,837	18,722
Reclamation deposits	75,511	74,362
Restricted investments and bond collateral	145,642	144,913
Investment in joint venture	26,992	26,951
Other assets	63,966	62,252
Total Assets	1,510,816	1,584,909
Current liabilities:
Current installments of long-term debt	72,710	86,272
Accounts payable and accrued expenses:
Trade and other accrued liabilities	117,280	142,233
Interest payable	14,679	22,458
Production taxes	47,081	44,995
Postretirement medical benefits	14,892	14,892
Deferred revenue	19,984	15,253
Asset retirement obligations	31,362	32,207
Other current liabilities	20,121	20,964
Total current liabilities	338,109	379,274
Long-term debt, less current installments	1,019,432	1,022,794
Postretirement medical benefits, less current portion	309,217	308,709
Pension and SERP obligations, less current portion	43,819	43,982
Deferred revenue, less current portion	13,524	16,251
Asset retirement obligations, less current portion	457,166	451,834
Other liabilities	52,171	52,182
Total liabilities	2,233,438	2,275,026
Shareholders' deficit:
Common stock of $.01 par value: Authorized 30,000,000 shares; Issued and outstanding 18,572,233 at March 31, 2017 and 18,570,642 at December 31, 2016	186	186
Other paid-in capital	249,441	248,143
Accumulated other comprehensive loss	(175,037)	(179,072)
Accumulated deficit	(794,536)	(757,367)
Total Westmoreland Coal Company shareholders’ deficit	(719,946)	(688,110)
Noncontrolling interests in consolidated subsidiaries	(2,676)	(2,007)
Total deficit	(722,622)	(690,117)
Total Liabilities and Shareholders' Deficit	$ 1,510,816	$ 1,584,909

Consolidated Balance Sheets (Pa

Consolidated Balance Sheets (Parenthetical) - $ / shares	Mar. 31, 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	18,572,633	18,570,642
Common stock, shares outstanding	18,572,633	18,570,642

Consolidated Statements of Oper

Consolidated Statements of Operations (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Income Statement [Abstract]
Revenues	$ 339,737	$ 355,854
Costs, expenses and other:
Cost of sales	284,604	281,125
Depreciation, depletion and amortization	36,567	37,015
Selling and administrative	30,426	27,399
Heritage health benefit expenses	3,298	3,015
(Gain) loss on sale/disposal of assets	(166)	336
Derivative (gain) loss	(2,384)	2,600
Income from equity affiliates	(1,520)	(1,293)
Other operating gain	0	(1,962)
Total costs, expenses and other	350,825	348,235
Operating (loss) income	(11,088)	7,619
Other (expense) income:
Interest expense	(29,261)	(28,927)
Interest income	893	1,791
Loss on foreign exchange	(467)	(1,387)
Other income (loss)	2,158	(122)
Total other income (expense)	(26,677)	(28,645)
Loss before income taxes	(37,765)	(21,026)
Income tax benefit	(465)	(47,935)
Net (loss) income	(37,300)	26,909
Less net loss attributable to noncontrolling interest	(499)	(498)
Net (loss) income applicable to common shareholders	$ (36,801)	$ 27,407
Net (loss) income per share applicable to common shareholders:
Basic and diluted (in dollars per share)	$ (1.98)	$ 1.50
Weighted average number of common shares outstanding:
Basic (in shares)	18,572	18,262
Diluted (in shares)	18,572	18,269

Consolidated Statements of Comp

Consolidated Statements of Comprehensive Loss (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Statement of Comprehensive Income [Abstract]
Net (loss) income	$ (37,300)	$ 26,909
Other comprehensive income (loss)
Amortization of accumulated actuarial gains, pension	594	573
Adjustments to accumulated actuarial gains and transition obligations, pension	136	172
Amortization of accumulated actuarial gains, transition obligations, and prior service costs, postretirement medical benefit	964	200
Adjustments to accumulated actuarial losses and transition obligations, postretirement medical benefit	0	(688)
Tax effect of other comprehensive income losses	(572)	(57)
Change in foreign currency translation adjustment	2,103	19,175
Unrealized and realized gains and losses on available-for-sale securities	810	(281)
Other comprehensive income, net of income taxes	4,035	19,094
Comprehensive (loss) income	(33,265)	46,003
Less: Comprehensive loss attributable to noncontrolling interest	(499)	(498)
Comprehensive (loss) income attributable to common shareholders	$ (32,766)	$ 46,501

Consolidated Statements of Cash

Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Cash flows from operating activities:
Net (loss) income	$ (37,300)	$ 26,909
Adjustments to reconcile net loss to net cash provided by operating activities:
Depreciation, depletion and amortization	36,567	37,015
Accretion of asset retirement obligation and receivable	11,295	7,007
Share-based compensation	1,347	2,580
Non-cash interest expense	2,296	2,269
Amortization of deferred financing costs	2,626	3,214
(Gain) loss on derivative instruments	(2,384)	2,600
Loss on foreign exchange	467	1,387
Income from equity affiliates	(1,520)	(1,293)
Distributions from equity affiliates	1,671	1,451
Deferred income tax benefit	(465)	(47,973)
Other	(1,474)	(2,926)
Changes in operating assets and liabilities:
Receivables	12,250	(10,052)
Inventories	5,156	(7,323)
Accounts payable and accrued expenses	(21,905)	7,698
Interest payable	(7,787)	(5,600)
Deferred revenue	2,005	3,389
Other assets and liabilities	7,104	(18,247)
Asset retirement obligation	(10,659)	18,449
Net cash provided by operating activities	(710)	20,554
Cash flows from investing activities:
Additions to property, plant and equipment	(7,210)	(5,548)
Change in restricted investments	(1,171)	(3,172)
Cash payments related to acquisitions and other	(3,580)	(126,865)
Proceeds from sales of assets	466	1,626
Receipts from loan and lease receivables	50,488	1,620
Payments related to loan and lease receivables	0	(312)
Other	(293)	79
Net cash provided by (used in) investing activities	38,700	(132,572)
Cash flows from financing activities:
Borrowings from long-term debt, net of debt discount	0	121,225
Repayments of long-term debt	(22,368)	(9,018)
Borrowings on revolving lines of credit	123,200	77,500
Repayments of revolving lines of credit	(123,200)	(79,500)
Debt issuance costs and other refinancing costs	0	(2,927)
Other	(178)	(262)
Net cash (used in) provided by financing activities	(22,546)	107,018
Effect of exchange rate changes on cash	(88)	(182)
Net increase (decrease) in cash and cash equivalents	15,356	(5,182)
Cash and cash equivalents, beginning of period	60,082	22,936
Cash and cash equivalents, end of period	75,438	17,754
Supplemental disclosures of cash flow information:
Cash paid for interest	31,951	30,397
Non-cash transactions:
Accrued purchases of property and equipment	2,969	2,279
Capital leases and other financing sources	$ 480	$ 0

BASIS OF PRESENTATION

BASIS OF PRESENTATION	3 Months Ended
	Mar. 31, 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”), 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 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 three months ended March 31, 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 consolidated financial statements and notes included in the Company’s Annual Report on Form 10-K for the year ended December 31, 2016 (“ 2016 Form 10-K”). Recently Adopted Accounting Pronouncements On March 30, 2016, the Financial Accounting Standards Board (“FASB”) issued Accounting Standards Update (“ASU”) 2016-09, “ Compensation - Stock Compensation (Topic 718).” The FASB issued this update to improve the accounting for employee share-based payments and affect all organizations that issue share-based payment awards to their employees. Several aspects of the accounting for share-based payment award transactions are simplified, including: (a) income tax consequences; (b) classification of awards as either equity or liabilities; and (c) classification on the statements of cash flows. The Company’s January 1, 2017 retrospective adoption of this guidance did not have a material impact to our financial statements. On October 24, 2016, the FASB issued ASU 2016-16, “Income Taxes (Topic 740): Intra-Entity Transfers of Assets Other than Inventory,” which eliminates the exception that prohibits the recognition of current and deferred income tax effects for intra-entity transfers of assets other than inventory until the asset has been sold to an outside party. The Company’s January 1, 2017 adoption of this guidance did not have a material impact to our financial statements. Recently Issued Accounting Pronouncements In March 2017, the FASB issued ASU 2017-07, “Compensation-Retirement Benefits: Improving the Presentation of Net Periodic Pension Cost and Net Periodic Postretirement Benefit Cost,” which: requires the disaggregation of the service cost component from the other components of net benefit costs in the income statement; provides explicit guidance on the presentation of service cost component and the other components of net benefit cost in the income statement; and allows only the service cost component of net benefit cost to be eligible for capitalization. ASU 2017-07 is effective for annual reporting periods beginning after December 15, 2017, and interim periods within those fiscal years, and requires retrospective adoption. Early adoption is permitted. The Company is evaluating the impact the adoption of ASU 2017-07 will have on the Company’s financial position or results of operations. In February 2016, the FASB issued 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 in Accounting Standards Codification 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 are currently evaluating the effect adopting this guidance will have on our consolidated financial statements and footnote disclosures. In May 2014, the FASB issued ASU 2014-09, “Revenue from Contracts with Customers,” 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. During 2016, the Company established an implementation team to develop a multi-phase plan to adopt the requirements of the new standard. The team is in the process of developing its conclusions on several aspects of the standard including principal versus agent considerations, identification of performance obligations and the determination of when control of goods and services transfers to the Company’s customers. 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 have not concluded which transition method we will elect, but we currently anticipate using the full retrospective approach.

ACQUISITION

ACQUISITION	3 Months Ended
	Mar. 31, 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): Final as of December 31, 2016 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. Three Months Ended March 31, 2016 (In thousands, except per share data) Total revenues As reported $ 355,854 Pro forma (unaudited) 382,129 Operating income As reported $ 7,619 Pro forma (unaudited) 8,714 Net income applicable to common shareholders As reported $ 27,407 Pro forma (unaudited) 27,832 Net income per share applicable to common shareholders (basic and diluted) As reported $ 1.50 Pro forma (unaudited) 1.52

VARIABLE INTEREST ENTITY

VARIABLE INTEREST ENTITY	3 Months Ended
	Mar. 31, 2017
Organization, Consolidation and Presentation of Financial Statements [Abstract]
VARIABLE INTEREST ENTITY	3. VARIABLE INTEREST ENTITY As of March 31, 2017 , the Company consolidated its 100% owned WSJ subsidiary which qualifies as a variable interest entity under U.S. GAAP (“VIE”). 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 for details surrounding the VIE’s acquisition and Note 6 - Debt and Lines of Credit 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 (in thousands): March 31, 2017 December 31, 2016 Assets $ 248,313 $ 268,910 Liabilities 207,448 243,884 Net carrying amount $ 40,865 $ 25,026

INVENTORIES

INVENTORIES	3 Months Ended
	Mar. 31, 2017
Inventory Disclosure [Abstract]
INVENTORIES	4. INVENTORIES Inventories consisted of the following: March 31, 2017 December 31, 2016 (In thousands) Coal stockpiles $ 31,170 $ 44,692 Coal fuel inventories 5,384 6,816 Materials and supplies 87,386 77,628 Reserve for obsolete inventory (3,642 ) (3,621 ) Total $ 120,298 $ 125,515

RESTRICTED INVESTMENTS AND BOND

RESTRICTED INVESTMENTS AND BOND COLLATERAL	3 Months Ended
	Mar. 31, 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 March 31, 2017 were as follows: Restricted Investments and Bond Collateral Reclamation Deposits Total Restricted Investments (In thousands) Cash and cash equivalents $ 63,989 $ 2,873 $ 66,862 Time deposits 2,473 — 2,473 Available-for-sale 79,180 72,638 151,818 $ 145,642 $ 75,511 $ 221,153 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 March 31, 2017 were as follows: Restricted Investments and Bond Collateral Reclamation Deposits Total Restricted Investments (In thousands) Cost basis $ 79,767 $ 72,915 $ 152,682 Gross unrealized holding gains 394 622 1,016 Gross unrealized holding losses (981 ) (899 ) (1,880 ) Fair value $ 79,180 $ 72,638 $ 151,818 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	3 Months Ended
	Mar. 31, 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 March 31, 2017 December 31, 2016 (In thousands) 8.75% Notes $ 350,000 $ 350,000 Term Loan 323,061 323,883 San Juan Loan 85,410 95,000 WMLP Term Loan 308,116 306,189 Revolver — — WMLP Revolver — — Capital lease obligations 48,592 55,061 Other debt 11,903 16,464 Total debt 1,127,082 1,146,597 Less debt discount and issuance costs, net (34,940 ) (37,531 ) Less current installments (72,710 ) (86,272 ) Long-term debt, less current installments $ 1,019,432 $ 1,022,794 The following table presents remaining aggregate contractual debt maturities of all long-term debt: March 31, 2017 (In thousands) 2017 $ 64,858 2018 328,181 2019 19,415 2020 340,261 2021 22,750 Thereafter 351,617 Total debt $ 1,127,082 Covenant Compliance Our lending arrangements contain, among other terms, events of default and various affirmative and negative covenants, financial covenants and cross-default provisions. 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. We are in compliance with all covenants and conditions under our debt agreements as of March 31, 2017 . Our continuing ability to meet our obligations and comply with these financial covenants depends on our ability to generate adequate cash flows. Based on our quarterly projections, including the impact of lost or diminished coal sales at certain of our mines, we anticipate that we will maintain compliance with the financial covenants and have sufficient liquidity to meet our obligations as they become due within one year after the date of the filing of our Quarterly Report. 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.” As of March 31, 2017 , we were in compliance with all covenants of the 8.75% Notes . 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 March 31, 2017 , the interest rate was 7.50% . The Term Loan is a primary obligation of the Parent and is guaranteed by the Guarantors. As of March 31, 2017 , we were in compliance with all covenants of the Term Loan . 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 March 31, 2017 , the cash interest rate is 8.29% . 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. As of March 31, 2017 , we were in compliance with all covenants of the San Juan Loan . 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 LIBOR floor of ( 1.15% ) plus 8.5% or the reference rate as defined in the financing agreement. As of March 31, 2017 , the cash interest rate is 9.65% . 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. At March 31, 2017 , we were in compliance with all covenants of the WMLP Term Loan . 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 our consolidated total net leverage ratio as defined in the financing agreement. The rate of PIK Interest is recalculated 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 for the three months ended March 31, 2017 . The outstanding WMLP Term Loan amount represents the principal balance of $289.7 million , plus PIK Interest of $18.4 million . 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 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 March 31, 2017 , availability on the Revolver was $33.4 million which reflects $9.9 million in outstanding letters of credit. We had no borrowings on the Revolver . The Revolver has a maturity date of December 31, 2018 . We were in compliance with all covenant requirements of the Revolver as of March 31, 2017 . On March 13, 2017, the Company executed a consent and ninth amendment to our Revolver (“Ninth Amendment”). The Ninth Amendment contained a consent from the Revolver lenders to grant a first priority security interest in the assets of the Company’s Genesee mine in favor of customer at the Genesee mine. Additionally, the Ninth Amendment adjusted the fixed charge coverage ratio calculation by amending the allocation schedule of cash interest payments between Canada and the U.S., and detailed modifications to the calculation of that ratio upon the occurrence of certain events, including the accelerated repayment of the loan and lease receivable arrangement at our Genesee mine. 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 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 March 31, 2017 , availability under the WMLP Revolver was $14.7 million . The WMLP Revolver has a maturity date of December 31, 2017. We were in compliance with all covenant requirements of the WMLP Revolver as of March 31, 2017 . Capital lease obligations The Company engages in leasing transactions for equipment utilized in its mining operations. During the three months ended March 31, 2017 , the Company entered into $0.5 million of new capital leases.

POSTRETIREMENT MEDICAL BENEFITS

POSTRETIREMENT MEDICAL BENEFITS AND PENSION	3 Months Ended
	Mar. 31, 2017
Compensation and Retirement Disclosure [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 March 31, 2017 2016 (In thousands) Components of net periodic benefit cost: Service cost $ 793 $ 935 Interest cost 3,197 3,111 Amortization of deferred items 964 200 Total net periodic benefit cost $ 4,954 $ 4,246 The following table shows the net periodic postretirement medical benefit costs that relate to current and former mining operations: Three Months Ended March 31, 2017 2016 (In thousands) Former mining operations $ 2,305 $ 2,135 Current operations 2,649 2,111 Total net periodic benefit cost $ 4,954 $ 4,246 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 March 31, 2017 2016 (In thousands) Components of net periodic benefit cost: Service cost $ 407 $ 608 Interest cost 2,630 2,287 Expected return on plan assets (3,627 ) (3,231 ) Amortization of deferred items 594 573 Total net periodic pension cost $ 4 $ 237 These costs are included in Cost of sales and Selling and administrative expenses. The Company made $0.1 million and $0.2 million of contributions to its pension plans in the three months ended March 31, 2017 and 2016 , respectively. The Company expects to make $1.1 million of contributions to its pension plans during the remainder of 2017 .

DERIVATIVE INSTRUMENTS

DERIVATIVE INSTRUMENTS	3 Months Ended
	Mar. 31, 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 $43.77 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 Footnote 9 - Fair Value Measurements . 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 $23.87 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. 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 March 31, 2017 December 31, 2016 Contracts to purchase power Other current liabilities $ 13,954 $ 13,382 Contracts to purchase power Other liabilities 19,028 18,384 Contract to sell power Other current assets 9,789 10,240 Contract to sell power Other assets 13,519 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 March 31, Derivative Instruments Statements of Operations Location 2017 2016 Contracts to purchase power Derivative (gain) loss $ 1,216 $ 2,600 Contract to sell power Derivative (gain) loss (3,600 ) — $ (2,384 ) $ 2,600

FAIR VALUE MEASUREMENTS

FAIR VALUE MEASUREMENTS	3 Months Ended
	Mar. 31, 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 March 31, 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 $ 23,308 $ — $ 23,308 Available-for-sale investments included in Restricted investments and bond collateral 79,180 79,180 — Available-for-sale investments included in Reclamation deposits 72,638 72,638 — $ 175,126 $ 151,818 $ 23,308 Liabilities: Contracts to purchase power included in Other current liabilities and Other liabilities $ 32,982 $ — $ 32,982 Warrants issued by WMLP included in Other liabilities 520 520 $ 33,502 $ 520 $ 32,982 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 March 31, 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) March 31, 2017 $ 398,824 $ 389,495 $ 693,318 $ 664,991 December 31, 2016 409,362 395,274 699,704 658,557

INCOME TAX

INCOME TAX	3 Months Ended
	Mar. 31, 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 three months ended March 31, 2016 , the effective tax rate differed from the statutory rate primarily as a result of the U.S. and Canadian valuation allowances and the impact of the statutory rate change in Alberta, Canada. For the three months ended March 31, 2017 , the effective tax rate differed from the statutory rate primarily due to the U.S. and Canadian valuation allowances. As part of the San Juan Acquisition during the quarter ended March 31, 2016 , the Company acquired $46.1 million in deferred tax liabilities. Changes in the acquiring company’s deferred tax assets or liabilities subsequent to a business combination are required to be recorded in income during the quarter in which the transaction occurs. Accordingly, the $46.1 million decrease in the Company’s net deferred tax assets resulted in the release of a corresponding $46.1 million valuation allowance and recognition of a tax benefit in the quarter ended March 31, 2016 .

SHAREHOLDERS' DEFICIT AND ACCUM

SHAREHOLDERS' DEFICIT AND ACCUMULATED OTHER COMPREHENSIVE LOSS	3 Months Ended
	Mar. 31, 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 136 — 938 2,103 (572 ) 2,605 Amounts reclassified from accumulated other comprehensive income (loss) 594 964 (128 ) — — 1,430 Balance at March 31, 2017 $ (25,393 ) $ (50,929 ) $ (864 ) $ (58,970 ) $ (38,881 ) $ (175,037 ) The following table reflects the reclassifications out of accumulated other comprehensive loss for the three months ended March 31, 2017 (in thousands): Details about accumulated other comprehensive loss components Amount reclassified from accumulated other comprehensive loss Affected line item in the statement where net income (loss) is presented Three Months Ended March 31, 2017 Available-for-sale securities Realized gains and losses on available-for-sale securities $ (128 ) Other income (loss) Amortization of defined benefit pension items Prior service costs $ 2 Cost of sales and Selling and administrative Actuarial losses 592 Cost of sales and Selling and administrative Total $ 594 Amortization of postretirement medical items Prior service costs $ (159 ) Cost of sales and Selling and administrative Actuarial losses 1,123 Cost of sales and Selling and administrative Total $ 964

SHARE-BASED COMPENSATION

SHARE-BASED COMPENSATION	3 Months Ended
	Mar. 31, 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 March 31, 2017 2016 (In thousands) Recognition of fair value of restricted stock units, stock options and SARs over vesting period; and issuance of stock $ 1,347 $ 1,114 Contributions of stock to the Company’s 401(k) plan — 1,466 Total share-based compensation expense $ 1,347 $ 2,580 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 March 31, 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 Vested (1,252 ) 13.01 Forfeited (2,027 ) 13.65 Non-vested at March 31, 2017 697,221 $ 17.12 $ 4,482 Stock Options No stock options were granted, vested, or forfeited during the three months ended March 31, 2017 . A summary of stock options outstanding as of March 31, 2017 is as follows: Stock Options Weighted Average Exercise Price Weighted Average Remaining Contractual Life (In years) Aggregate Intrinsic Value (In thousands) Unamortized Compensation Expense (In thousands) Outstanding at March 31, 2017 109,306 $ 22.16 0.9 $ — $ — 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	3 Months Ended
	Mar. 31, 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 shareholders by the weighted average number of shares of common stock outstanding during each period. Net income (loss) applicable to common shareholders 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, stock appreciation rights and restricted stock units. No such items were included in the computations of diluted loss per share in the three months ended March 31, 2017 because the Company incurred a net loss applicable to common shareholders in this period 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 March 31, 2017 2016 (In thousands) Restricted stock units, stock options and SARs 807 470

SEGMENT INFORMATION

SEGMENT INFORMATION	3 Months Ended
	Mar. 31, 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 revenue and operating income. 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 (2) Power Heritage Corporate (2) Consolidated (In thousands) Three Months Ended March 31, 2017 Revenues $ 137,368 $ 109,015 $ 74,805 $ 21,227 $ — $ (2,678 ) $ 339,737 Depreciation, depletion, and amortization 15,999 10,254 10,351 — — (37 ) 36,567 Operating income (loss) 4,336 (7,104 ) 1,282 (753 ) (3,670 ) (5,179 ) (11,088 ) Total assets 593,936 441,179 375,177 62,924 16,446 21,154 1,510,816 Capital expenditures 1,895 2,094 3,221 — — — 7,210 Three Months Ended March 31, 2016 Revenues $ 155,990 $ 93,756 $ 92,481 $ 21,995 $ — $ (8,368 ) $ 355,854 Depreciation, depletion, and amortization 15,951 5,828 15,265 — — (29 ) 37,015 Operating income (loss) 7,667 12,103 809 (5,801 ) (3,481 ) (3,678 ) 7,619 Total assets 667,448 523,987 411,656 41,717 16,379 1,761 1,662,948 Capital expenditures 2,655 1,349 1,544 — — — 5,548 ____________________ (1) T he San Juan Acquisition was completed on January 31, 2016. For the three months ended March 31, 2016, revenues for the Westmoreland San Juan Entities were $26.7 million and operating losses were $1.6 million . (2) The Coal - WMLP segment recorded revenues of $2.7 million for intersegment revenues to the Coal - U.S. segment for the three months ended March 31, 2017 and $8.4 million for the three months ended March 31, 2016 . Eliminations for intersegment revenues and cost of sales are presented within the Corporate segment.

CONTINGENCIES

CONTINGENCIES	3 Months Ended
	Mar. 31, 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 March 31, 2017 , the Company has recorded $5.0 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	3 Months Ended
	Mar. 31, 2017
Subsequent Events [Abstract]
SUBSEQUENT EVENTS	16. SUBSEQUENT EVENTS The Company has evaluated subsequent events in accordance with ASC 855, Subsequent Events, through the filing date of this Quarterly Report on Form 10-Q, and determined that there have been no events that have not been disclosed elsewhere in the Notes to the Consolidated Financial Statements (Unaudited) that have occurred that would require adjustments to disclosures in the consolidated financial statements (unaudited).

BASIS OF PRESENTATION Basis of

BASIS OF PRESENTATION Basis of Presentation (Policies)	3 Months Ended
	Mar. 31, 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 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 three months ended March 31, 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 consolidated financial statements and notes 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 Adopted Accounting Pronouncements On March 30, 2016, the Financial Accounting Standards Board (“FASB”) issued Accounting Standards Update (“ASU”) 2016-09, “ Compensation - Stock Compensation (Topic 718).” The FASB issued this update to improve the accounting for employee share-based payments and affect all organizations that issue share-based payment awards to their employees. Several aspects of the accounting for share-based payment award transactions are simplified, including: (a) income tax consequences; (b) classification of awards as either equity or liabilities; and (c) classification on the statements of cash flows. The Company’s January 1, 2017 retrospective adoption of this guidance did not have a material impact to our financial statements. On October 24, 2016, the FASB issued ASU 2016-16, “Income Taxes (Topic 740): Intra-Entity Transfers of Assets Other than Inventory,” which eliminates the exception that prohibits the recognition of current and deferred income tax effects for intra-entity transfers of assets other than inventory until the asset has been sold to an outside party. The Company’s January 1, 2017 adoption of this guidance did not have a material impact to our financial statements. Recently Issued Accounting Pronouncements In March 2017, the FASB issued ASU 2017-07, “Compensation-Retirement Benefits: Improving the Presentation of Net Periodic Pension Cost and Net Periodic Postretirement Benefit Cost,” which: requires the disaggregation of the service cost component from the other components of net benefit costs in the income statement; provides explicit guidance on the presentation of service cost component and the other components of net benefit cost in the income statement; and allows only the service cost component of net benefit cost to be eligible for capitalization. ASU 2017-07 is effective for annual reporting periods beginning after December 15, 2017, and interim periods within those fiscal years, and requires retrospective adoption. Early adoption is permitted. The Company is evaluating the impact the adoption of ASU 2017-07 will have on the Company’s financial position or results of operations. In February 2016, the FASB issued 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 in Accounting Standards Codification 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 are currently evaluating the effect adopting this guidance will have on our consolidated financial statements and footnote disclosures. In May 2014, the FASB issued ASU 2014-09, “Revenue from Contracts with Customers,” 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. During 2016, the Company established an implementation team to develop a multi-phase plan to adopt the requirements of the new standard. The team is in the process of developing its conclusions on several aspects of the standard including principal versus agent considerations, identification of performance obligations and the determination of when control of goods and services transfers to the Company’s customers. 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 have not concluded which transition method we will elect, but we currently anticipate using the full retrospective approach.

ACQUISITION (Tables)

ACQUISITION (Tables)	3 Months Ended
	Mar. 31, 2017
Business Acquisition [Line Items]
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. Three Months Ended March 31, 2016 (In thousands, except per share data) Total revenues As reported $ 355,854 Pro forma (unaudited) 382,129 Operating income As reported $ 7,619 Pro forma (unaudited) 8,714 Net income applicable to common shareholders As reported $ 27,407 Pro forma (unaudited) 27,832 Net income per share applicable to common shareholders (basic and diluted) As reported $ 1.50 Pro forma (unaudited) 1.52
San Juan Coal Company
Business Acquisition [Line Items]
Summary of purchase consideration and allocation of purchase consideration

VARIABLE INTEREST ENTITY (Table

VARIABLE INTEREST ENTITY (Tables)	3 Months Ended
	Mar. 31, 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 (in thousands): March 31, 2017 December 31, 2016 Assets $ 248,313 $ 268,910 Liabilities 207,448 243,884 Net carrying amount $ 40,865 $ 25,026

INVENTORIES (Tables)

INVENTORIES (Tables)	3 Months Ended
	Mar. 31, 2017
Inventory Disclosure [Abstract]
Inventories	Inventories consisted of the following: March 31, 2017 December 31, 2016 (In thousands) Coal stockpiles $ 31,170 $ 44,692 Coal fuel inventories 5,384 6,816 Materials and supplies 87,386 77,628 Reserve for obsolete inventory (3,642 ) (3,621 ) Total $ 120,298 $ 125,515

RESTRICTED INVESTMENTS AND BO27

RESTRICTED INVESTMENTS AND BOND COLLATERAL (Tables)	3 Months Ended
	Mar. 31, 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 March 31, 2017 were as follows: Restricted Investments and Bond Collateral Reclamation Deposits Total Restricted Investments (In thousands) Cash and cash equivalents $ 63,989 $ 2,873 $ 66,862 Time deposits 2,473 — 2,473 Available-for-sale 79,180 72,638 151,818 $ 145,642 $ 75,511 $ 221,153 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 March 31, 2017 were as follows: Restricted Investments and Bond Collateral Reclamation Deposits Total Restricted Investments (In thousands) Cost basis $ 79,767 $ 72,915 $ 152,682 Gross unrealized holding gains 394 622 1,016 Gross unrealized holding losses (981 ) (899 ) (1,880 ) Fair value $ 79,180 $ 72,638 $ 151,818 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)	3 Months Ended
	Mar. 31, 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 March 31, 2017 December 31, 2016 (In thousands) 8.75% Notes $ 350,000 $ 350,000 Term Loan 323,061 323,883 San Juan Loan 85,410 95,000 WMLP Term Loan 308,116 306,189 Revolver — — WMLP Revolver — — Capital lease obligations 48,592 55,061 Other debt 11,903 16,464 Total debt 1,127,082 1,146,597 Less debt discount and issuance costs, net (34,940 ) (37,531 ) Less current installments (72,710 ) (86,272 ) Long-term debt, less current installments $ 1,019,432 $ 1,022,794
Contractual maturities of all long-term debt	The following table presents remaining aggregate contractual debt maturities of all long-term debt: March 31, 2017 (In thousands) 2017 $ 64,858 2018 328,181 2019 19,415 2020 340,261 2021 22,750 Thereafter 351,617 Total debt $ 1,127,082

POSTRETIREMENT MEDICAL BENEFI29

POSTRETIREMENT MEDICAL BENEFITS AND PENSION (Tables)	3 Months Ended
	Mar. 31, 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 March 31, 2017 2016 (In thousands) Components of net periodic benefit cost: Service cost $ 793 $ 935 Interest cost 3,197 3,111 Amortization of deferred items 964 200 Total net periodic benefit cost $ 4,954 $ 4,246 The following table shows the net periodic postretirement medical benefit costs that relate to current and former mining operations: Three Months Ended March 31, 2017 2016 (In thousands) Former mining operations $ 2,305 $ 2,135 Current operations 2,649 2,111 Total net periodic benefit cost $ 4,954 $ 4,246
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 March 31, 2017 2016 (In thousands) Components of net periodic benefit cost: Service cost $ 407 $ 608 Interest cost 2,630 2,287 Expected return on plan assets (3,627 ) (3,231 ) Amortization of deferred items 594 573 Total net periodic pension cost $ 4 $ 237

DERIVATIVE INSTRUMENTS (Tables)

DERIVATIVE INSTRUMENTS (Tables)	3 Months Ended
	Mar. 31, 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 March 31, 2017 December 31, 2016 Contracts to purchase power Other current liabilities $ 13,954 $ 13,382 Contracts to purchase power Other liabilities 19,028 18,384 Contract to sell power Other current assets 9,789 10,240 Contract to sell power Other assets 13,519 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 March 31, Derivative Instruments Statements of Operations Location 2017 2016 Contracts to purchase power Derivative (gain) loss $ 1,216 $ 2,600 Contract to sell power Derivative (gain) loss (3,600 ) — $ (2,384 ) $ 2,600

FAIR VALUE MEASUREMENTS (Tables

FAIR VALUE MEASUREMENTS (Tables)	3 Months Ended
	Mar. 31, 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 March 31, 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 $ 23,308 $ — $ 23,308 Available-for-sale investments included in Restricted investments and bond collateral 79,180 79,180 — Available-for-sale investments included in Reclamation deposits 72,638 72,638 — $ 175,126 $ 151,818 $ 23,308 Liabilities: Contracts to purchase power included in Other current liabilities and Other liabilities $ 32,982 $ — $ 32,982 Warrants issued by WMLP included in Other liabilities 520 520 $ 33,502 $ 520 $ 32,982
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) March 31, 2017 $ 398,824 $ 389,495 $ 693,318 $ 664,991 December 31, 2016 409,362 395,274 699,704 658,557

SHAREHOLDERS' DEFICIT AND ACC32

SHAREHOLDERS' DEFICIT AND ACCUMULATED OTHER COMPREHENSIVE LOSS (Tables)	3 Months Ended
	Mar. 31, 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 136 — 938 2,103 (572 ) 2,605 Amounts reclassified from accumulated other comprehensive income (loss) 594 964 (128 ) — — 1,430 Balance at March 31, 2017 $ (25,393 ) $ (50,929 ) $ (864 ) $ (58,970 ) $ (38,881 ) $ (175,037 )
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 months ended March 31, 2017 (in thousands): Details about accumulated other comprehensive loss components Amount reclassified from accumulated other comprehensive loss Affected line item in the statement where net income (loss) is presented Three Months Ended March 31, 2017 Available-for-sale securities Realized gains and losses on available-for-sale securities $ (128 ) Other income (loss) Amortization of defined benefit pension items Prior service costs $ 2 Cost of sales and Selling and administrative Actuarial losses 592 Cost of sales and Selling and administrative Total $ 594 Amortization of postretirement medical items Prior service costs $ (159 ) Cost of sales and Selling and administrative Actuarial losses 1,123 Cost of sales and Selling and administrative Total $ 964

SHARE-BASED COMPENSATION (Table

SHARE-BASED COMPENSATION (Tables)	3 Months Ended
	Mar. 31, 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 March 31, 2017 2016 (In thousands) Recognition of fair value of restricted stock units, stock options and SARs over vesting period; and issuance of stock $ 1,347 $ 1,114 Contributions of stock to the Company’s 401(k) plan — 1,466 Total share-based compensation expense $ 1,347 $ 2,580
Summary of Restricted Stock Unit activity	A summary of outstanding restricted stock units as of March 31, 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 Vested (1,252 ) 13.01 Forfeited (2,027 ) 13.65 Non-vested at March 31, 2017 697,221 $ 17.12 $ 4,482
Summary of Stock Option Activity	A summary of stock options outstanding as of March 31, 2017 is as follows: Stock Options Weighted Average Exercise Price Weighted Average Remaining Contractual Life (In years) Aggregate Intrinsic Value (In thousands) Unamortized Compensation Expense (In thousands) Outstanding at March 31, 2017 109,306 $ 22.16 0.9 $ — $ —

EARNINGS PER SHARE (Tables)

EARNINGS PER SHARE (Tables)	3 Months Ended
	Mar. 31, 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 March 31, 2017 2016 (In thousands) Restricted stock units, stock options and SARs 807 470

SEGMENT INFORMATION (Tables)

SEGMENT INFORMATION (Tables)	3 Months Ended
	Mar. 31, 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 (2) Power Heritage Corporate (2) Consolidated (In thousands) Three Months Ended March 31, 2017 Revenues $ 137,368 $ 109,015 $ 74,805 $ 21,227 $ — $ (2,678 ) $ 339,737 Depreciation, depletion, and amortization 15,999 10,254 10,351 — — (37 ) 36,567 Operating income (loss) 4,336 (7,104 ) 1,282 (753 ) (3,670 ) (5,179 ) (11,088 ) Total assets 593,936 441,179 375,177 62,924 16,446 21,154 1,510,816 Capital expenditures 1,895 2,094 3,221 — — — 7,210 Three Months Ended March 31, 2016 Revenues $ 155,990 $ 93,756 $ 92,481 $ 21,995 $ — $ (8,368 ) $ 355,854 Depreciation, depletion, and amortization 15,951 5,828 15,265 — — (29 ) 37,015 Operating income (loss) 7,667 12,103 809 (5,801 ) (3,481 ) (3,678 ) 7,619 Total assets 667,448 523,987 411,656 41,717 16,379 1,761 1,662,948 Capital expenditures 2,655 1,349 1,544 — — — 5,548 ____________________ (1) T he San Juan Acquisition was completed on January 31, 2016. For the three months ended March 31, 2016, revenues for the Westmoreland San Juan Entities were $26.7 million and operating losses were $1.6 million . (2) The Coal - WMLP segment recorded revenues of $2.7 million for intersegment revenues to the Coal - U.S. segment for the three months ended March 31, 2017 and $8.4 million for the three months ended March 31, 2016 . 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
	Mar. 31, 2017	Mar. 31, 2016
Total revenues
As reported	$ 339,737	$ 355,854
Pro forma (unaudited)		382,129
Operating income
As reported	(11,088)	7,619
Pro forma (unaudited)		8,714
Net income applicable to common shareholders
As reported	$ (36,801)	27,407
Pro forma (unaudited)		$ 27,832
Net income per share applicable to common shareholders (basic and diluted)
As reported, (in dollars per share)	$ (1.98)	$ 1.50
Pro forma (unaudited) (in dollars per share)		$ 1.52

VARIABLE INTEREST ENTITY (Detai

VARIABLE INTEREST ENTITY (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 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		$ 248,313	$ 268,910
Liabilities		207,448	243,884
Net carrying amount		$ 40,865	$ 25,026

INVENTORIES (Detail)

INVENTORIES (Detail) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Inventory Disclosure [Abstract]
Coal stockpiles	$ 31,170	$ 44,692
Coal fuel inventories	5,384	6,816
Materials and supplies	87,386	77,628
Reserve for obsolete inventory	(3,642)	(3,621)
Total	$ 120,298	$ 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	Mar. 31, 2017	Dec. 31, 2016
Investment [Line Items]
Restricted investments and bond collateral	$ 145,642	$ 144,913
Restricted Investments and Bond Collateral
Investment [Line Items]
Cash and cash equivalents	63,989	66,860
Time deposits	2,473	2,473
Available-for-sale	79,180	75,580
Restricted investments and bond collateral	145,642	144,913
Reclamation Deposits
Investment [Line Items]
Cash and cash equivalents	2,873	2,673
Time deposits	0	0
Available-for-sale	72,638	71,689
Restricted investments and bond collateral	75,511	74,362
Restricted Investments
Investment [Line Items]
Cash and cash equivalents	66,862	69,533
Time deposits	2,473	2,473
Available-for-sale	151,818	147,269
Restricted investments and bond collateral	$ 221,153	$ 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	Mar. 31, 2017	Dec. 31, 2016
Restricted Investments and Bond Collateral
Schedule of Available-for-sale Securities [Line Items]
Cost basis	$ 79,767	$ 76,558
Gross unrealized holding gains	394	251
Gross unrealized holding losses	(981)	(1,229)
Fair value	79,180	75,580
Reclamation Deposits
Schedule of Available-for-sale Securities [Line Items]
Cost basis	72,915	72,381
Gross unrealized holding gains	622	453
Gross unrealized holding losses	(899)	(1,145)
Fair value	72,638	71,689
Restricted Investments
Schedule of Available-for-sale Securities [Line Items]
Cost basis	152,682	148,939
Gross unrealized holding gains	1,016	704
Gross unrealized holding losses	(1,880)	(2,374)
Fair value	$ 151,818	$ 147,269

DEBT AND LINES OF CREDIT - Outs

DEBT AND LINES OF CREDIT - Outstanding Lines of Credit and Debt (Detail) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Debt Instrument [Line Items]
Total debt	$ 1,127,082	$ 1,146,597
Less debt discount and issuance costs, net	(34,940)	(37,531)
Less current installments	(72,710)	(86,272)
Long-term debt, less current installments	1,019,432	1,022,794
Capital lease obligations
Debt Instrument [Line Items]
Total debt	48,592	55,061
Other
Debt Instrument [Line Items]
Total debt	11,903	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	$ 323,061	323,883
Stated interest rate (percent)	7.50%
San Juan Loan | Term Notes
Debt Instrument [Line Items]
Total debt	$ 85,410	95,000
Stated interest rate (percent)	7.25%
WML Term Debt Due 2018 | Term Notes
Debt Instrument [Line Items]
Total debt	$ 308,116	306,189
Revolving line of credit | Revolving line of credit
Debt Instrument [Line Items]
Total debt	0	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	Mar. 31, 2017USD ($)
Debt Disclosure [Abstract]
2,017	$ 64,858
2,018	328,181
2,019	19,415
2,020	340,261
2,021	22,750
Thereafter	351,617
Total	$ 1,127,082

DEBT AND LINES OF CREDIT - Addi

DEBT AND LINES OF CREDIT - Additional Information (Detail) - USD ($)	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Jan. 31, 2016
Debt Instrument [Line Items]
Non-cash interest expense	$ 2,296,000	$ 2,269,000
Capital lease obligations incurred	500,000
Revolving line of credit
Debt Instrument [Line Items]
Maximum borrowing capacity	50,000,000
Remaining borrowing capacity	33,387,707
Line of credit outstanding	9,880,000
Outstanding letters of credit	$ 0
Term Loan Facility Due 2020 [Member] | Term Notes
Debt Instrument [Line Items]
Stated interest rate (percent)	7.50%
Senior secured notes due 2022 | Senior Notes
Debt Instrument [Line Items]
Stated interest rate (percent)	8.75%
San Juan Loan | Term Notes
Debt Instrument [Line Items]
Stated interest rate (percent)	7.25%
Senior secured notes			$ 125,000,000
Interest rate at period end (percent)	8.29%
WML Term Debt Due 2018 | Term Notes
Debt Instrument [Line Items]
Interest rate at period end (percent)	9.65%
Non-cash interest expense	$ 2,300,000
Debt outstanding	289,700,000
Accrued paid-in-kind interest	18,400,000
Seasonal Increase to Borrowing Capacity | Revolving line of credit
Debt Instrument [Line Items]
Maximum borrowing capacity	60,000,000
USD Denominated Sub-facility [Member] | Revolving line of credit
Debt Instrument [Line Items]
Maximum borrowing capacity	30,000,000
USD Denominated Sub-facility with Seasonal Increase [Member] | Revolving line of credit
Debt Instrument [Line Items]
Maximum borrowing capacity	35,000,000
CAD-Denominated Sub-facility [Member] | Revolving line of credit
Debt Instrument [Line Items]
Maximum borrowing capacity	20,000,000
CAD Denominated Sub-facility with Seasonal Increase [Member] | Revolving line of credit
Debt Instrument [Line Items]
Maximum borrowing capacity	25,000,000
WMLP and subsidiaries | Revolving line of credit
Debt Instrument [Line Items]
Maximum borrowing capacity	15,000,000
Remaining borrowing capacity	14,700,000
WMLP and subsidiaries | Letter of Credit
Debt Instrument [Line Items]
Maximum borrowing capacity	$ 10,000,000
London Interbank Offered Rate (LIBOR) [Member] | 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)	1.15%
One-month LIBOR [Member] | Term Loan Facility Due 2020 [Member] | 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 [Member] | Term Loan Facility Due 2020 [Member] | Term Notes
Debt Instrument [Line Items]
Basis spread on variable rate (percent)	6.50%
Three-month LIBOR [Member] | Term Loan Facility Due 2020 [Member] | Term Notes
Debt Instrument [Line Items]
Basis spread on variable rate (percent)	6.50%
Six-month LIBOR [Member] | Term Loan Facility Due 2020 [Member] | Term Notes
Debt Instrument [Line Items]
Basis spread on variable rate (percent)	6.50%
Federal Funds Rate [Member] | Term Loan Facility Due 2020 [Member] | 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% [Member] | Term Loan Facility Due 2020 [Member] | Term Notes
Debt Instrument [Line Items]
Basis spread on variable rate (percent)	5.50%
One-month LIBOR plus 1% [Member] | Term Loan Facility Due 2020 [Member] | 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%

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
	Mar. 31, 2017	Mar. 31, 2016
Components of net periodic benefit cost:
Service cost	$ 793	$ 935
Interest cost	3,197	3,111
Amortization of deferred items	964	200
Total net periodic benefit cost	$ 4,954	$ 4,246

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
	Mar. 31, 2017	Mar. 31, 2016
Net periodic postretirement medical benefit costs relating to current and former mining operations:
Total net periodic benefit cost	$ 4,954	$ 4,246
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
Current Operations
Net periodic postretirement medical benefit costs relating to current and former mining operations:
Total net periodic benefit cost	$ 2,649	$ 2,111

POSTRETIREMENT MEDICAL BENEFI48

POSTRETIREMENT MEDICAL BENEFITS AND PENSION - Pension Benefit Disclosures (Details) - Pension - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Service cost	$ 407	$ 608
Interest cost	2,630	2,287
Expected return on plan assets	(3,627)	(3,231)
Amortization of deferred items	594	573
Total net periodic benefit cost	4	237
Employer contributions during the period	100	$ 200
Expected employer contributions to pension plans during the remainder of the year	$ 1,100

DERIVATIVE INSTRUMENTS (Details

DERIVATIVE INSTRUMENTS (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2017USD ($)$ / MWh	Mar. 31, 2016USD ($)	Dec. 31, 2016USD ($)
Derivative [Line Items]
Gain (loss) on derivative, net	$ 2,384	$ (2,600)
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	$ 1,216	2,600
Not Designated as Hedging Instrument | Contract to Sell Power | Derivative loss
Derivative [Line Items]
Gain (loss) on derivative, net	(3,600)	0
Not Designated as Hedging Instrument | Contract to Sell Power | Other current assets
Derivative [Line Items]
Derivative asset	9,789		$ 10,240
Not Designated as Hedging Instrument | Contract to Sell Power | Other assets
Derivative [Line Items]
Derivative asset	13,519		9,528
Not Designated as Hedging Instrument | Power Contract | Derivative loss
Derivative [Line Items]
Gain (loss) on derivative, net	(2,384)	$ 2,600
Not Designated as Hedging Instrument | Power Contract | Other current liabilities
Derivative [Line Items]
Derivative liability	13,954		13,382
Not Designated as Hedging Instrument | Power Contract | Other liabilities
Derivative [Line Items]
Derivative liability	$ 19,028		$ 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	23.87
Weighted Average | Power Contract
Derivative [Line Items]
Contracted power price notional amount | $ / MWh	43.77

FAIR VALUE MEASUREMENTS Summary

FAIR VALUE MEASUREMENTS Summary of Financial Assets at Fair Value (Details) - Fair Value, Measurements, Recurring $ in Thousands	Mar. 31, 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	$ 79,180
Available-for-sale investments included in Reclamation deposits	72,638
Available-for-sale investments	151,818
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	23,308
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	79,180
Available-for-sale investments included in Reclamation deposits	72,638
Available-for-sale investments	175,126
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	23,308
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	23,308
Other current liabilities and other liabilities | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative liability	520
Other current liabilities and other liabilities | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative liability	32,982
Other current liabilities and other liabilities | Fair Value
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative liability	33,502
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	32,982
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	32,982
Other liabilities | Warrant | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative liability	520
Other liabilities | Warrant | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative liability
Other liabilities | Warrant | Fair Value
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative liability	$ 520

FAIR VALUE MEASUREMENTS (Detail

FAIR VALUE MEASUREMENTS (Details) - Significant unobservable inputs, Level 3 - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Carrying Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Debt at fixed interest rate	$ 398,824	$ 409,362
Debt at variable interest rate	693,318	699,704
Fair Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Debt at fixed interest rate	389,495	395,274
Debt at variable interest rate	$ 664,991	$ 658,557

INCOME TAX Income Tax Disclosur

INCOME TAX Income Tax Disclosure (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Business Acquisition [Line Items]
Decrease to deferred tax assets		$ (46.1)
Release of valuation allowance	$ 46.1
San Juan Coal Company
Business Acquisition [Line Items]
Deferred income taxes		$ 46.1

SHAREHOLDERS' DEFICIT AND ACC53

SHAREHOLDERS' DEFICIT AND ACCUMULATED OTHER COMPREHENSIVE LOSS - Changes in Accumulated Other Comprehensive Income by component (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2017USD ($)
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance at beginning of period	$ (179,072)
Other comprehensive income before reclassifications	2,605
Amounts reclassified from accumulated other comprehensive income (loss)	1,430
Balance at end of period	(175,037)
Defined benefit plans adjustment | Pension
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance at beginning of period	(26,123)
Other comprehensive income before reclassifications	136
Amounts reclassified from accumulated other comprehensive income (loss)	594
Balance at end of period	(25,393)
Defined benefit plans adjustment | Postretirement Medical Benefits
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance at beginning of period	(51,893)
Amounts reclassified from accumulated other comprehensive income (loss)	964
Balance at end of period	(50,929)
Available for sale securities
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance at beginning of period	(1,674)
Other comprehensive income before reclassifications	938
Amounts reclassified from accumulated other comprehensive income (loss)	(128)
Balance at end of period	(864)
Foreign currency translation adjustment
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance at beginning of period	(61,073)
Other comprehensive income before reclassifications	2,103
Balance at end of period	(58,970)
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	(572)
Balance at end of period	$ (38,881)

SHAREHOLDERS' DEFICIT AND ACC54

SHAREHOLDERS' DEFICIT AND ACCUMULATED OTHER COMPREHENSIVE LOSS - Reclassifications out of Accumulated Other Comprehensive Income (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2017USD ($)
Defined benefit plans adjustment | Pension
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Prior service costs	$ 2
Actuarial losses	592
Amortization of defined benefit pension and postretirement medical benefits	594
Defined benefit plans adjustment | Postretirement Medical Benefits
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Prior service costs	(159)
Actuarial losses	1,123
Amortization of defined benefit pension and postretirement medical benefits	964
Other income (loss) | 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	$ (128)

SHARE-BASED COMPENSATION - Comp

SHARE-BASED COMPENSATION - Compensation Expense from Share-Based Arrangements (Detail) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2017	Mar. 31, 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	$ 1,347	$ 1,114
Contributions of stock to the Company's 401(k) plan	0	1,466
Total share-based compensation expense	$ 1,347	$ 2,580
Company shares contributed to match employees' contributions to their 401k plans (shares)			342,353

SHARE-BASED COMPENSATION - Summ

SHARE-BASED COMPENSATION - Summary of Restricted Stock Unit Activity (Detail) - Restricted Stock Units (RSUs) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 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
Vested (units)	(1,252)
Forfeited (units)	(2,027)
Balance end of period (units)	697,221
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, Wested (in USD per share)	13.01
Weighted Average Grant Date Fair Value, Forfeited (in USD per share)	13.65
Weighted Average Grant Date Fair Value, end of period (in USD per share)	$ 17.12
Unamortized Compensation Expense	$ 4,482

SHARE-BASED COMPENSATION - Su57

SHARE-BASED COMPENSATION - Summary of Stock Options and SARs (Details) - Stock Options $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2017USD ($)$ / sharesshares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock options outstanding (shares)	109,306
Granted, shares	0
Vested, shares	0
Forfeited, shares	0
Weighted average exercise price (in dollars per share) | $ / shares	$ 22.16
Outstanding - Weighted Average Remaining Contractual Life (In years)	10 months 24 days
Aggregate Intrinsic Value | $	$ 0
Unamortized Compensation Expense | $	$ 0

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
	Mar. 31, 2017	Mar. 31, 2016
Restricted stock units, stock options and SARs
Class of Stock [Line Items]
Shares excluded from diluted shares calculation	807	470

SEGMENT INFORMATION - Summarize

SEGMENT INFORMATION - Summarized Financial Information by Segment (Detail) $ in Thousands		3 Months Ended
		Mar. 31, 2017USD ($)segments	Mar. 31, 2016USD ($)	Dec. 31, 2016USD ($)
Segment Reporting Information [Line Items]
Number of Reportable Segments | segments		6
Revenues		$ 339,737	$ 355,854
Depreciation, depletion and amortization		36,567	37,015
Operating income (loss)		(11,088)	7,619
Total assets		1,510,816	1,662,948	$ 1,584,909
Capital expenditures		7,210	5,548
Coal - U.S. Segment
Segment Reporting Information [Line Items]
Revenues	[1]	137,368	155,990
Depreciation, depletion and amortization	[1]	15,999	15,951
Operating income (loss)	[1]	4,336	7,667
Total assets	[1]	593,936	667,448
Capital expenditures	[1]	1,895	2,655
Coal - Canada Segment
Segment Reporting Information [Line Items]
Revenues		109,015	93,756
Depreciation, depletion and amortization		10,254	5,828
Operating income (loss)		(7,104)	12,103
Total assets		441,179	523,987
Capital expenditures		2,094	1,349
Coal - WMLP Segment
Segment Reporting Information [Line Items]
Revenues	[2]	74,805	92,481
Depreciation, depletion and amortization	[2]	10,351	15,265
Operating income (loss)	[2]	1,282	809
Total assets	[2]	375,177	411,656
Capital expenditures	[2]	3,221	1,544
Power Segment
Segment Reporting Information [Line Items]
Revenues		21,227	21,995
Depreciation, depletion and amortization		0	0
Operating income (loss)		(753)	(5,801)
Total assets		62,924	41,717
Capital expenditures		0	0
Heritage Segment
Segment Reporting Information [Line Items]
Revenues		0	0
Depreciation, depletion and amortization		0	0
Operating income (loss)		(3,670)	(3,481)
Total assets		16,446	16,379
Capital expenditures		0	0
Corporate and Eliminations
Segment Reporting Information [Line Items]
Revenues	[2]	(2,678)	(8,368)
Depreciation, depletion and amortization	[2]	(37)	(29)
Operating income (loss)	[2]	(5,179)	(3,678)
Total assets	[2]	21,154	1,761
Capital expenditures	[2]	$ 0	0
San Juan Coal Company | Coal Segment [Member]
Segment Reporting Information [Line Items]
Revenues			26,700
Operating income (loss)			$ 1,600
[1]	The San Juan Acquisition was completed on January 31, 2016. For the three months ended March 31, 2016, revenues for the Westmoreland San Juan Entities were $26.7 million and operating losses were $1.6 million.
[2]	The Coal - WMLP segment recorded revenues of $2.7 million for intersegment revenues to the Coal - U.S. segment for the three months ended March 31, 2017 and $8.4 million for the three months ended March 31, 2016. Eliminations for intersegment revenues and cost of sales are presented within the Corporate segment.

CONTINGENCIES Contingencies (De

CONTINGENCIES Contingencies (Details) $ in Millions	Mar. 31, 2017USD ($)
Other current liabilities
Loss Contingencies [Line Items]
Remediation obligation	$ 5