WESTMORELAND COAL (WLBAQ) 8-K 6 Aug 14 Index to Financial Statements Financial data

Document_and_Entity_Informatio

Document and Entity Information	3 Months Ended
	Mar. 31, 2014
Document Documentand Entity Information [Abstract]	'
Entity Registrant Name	'WESTMORELAND COAL Co
Entity Central Index Key	'0000106455
Document Type	'8-K
Document Period End Date	31-Mar-14
Amendment Flag	'false

Consolidated_Balance_Sheets

Consolidated Balance Sheets (USD $)	Mar. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified
Current assets:	'	'	'
Cash and cash equivalents	$61,900	$61,110	$31,610
Receivables:	'	'	'
Trade	64,715	66,196	60,037
Contractual third-party reclamation receivables	8,213	8,487	10,207
Other	1,375	5,086	3,220
Total receivables	74,303	79,769	73,464
Inventories	35,447	39,972	37,734
Restricted investments and bond collateral	16,900	5,998	0
Other current assets	16,643	18,190	16,504
Total current assets	205,193	205,039	159,312
Property, plant and equipment:	'	'	'
Land and mineral rights	278,198	278,188	261,741
Plant and equipment	673,189	657,696	635,720
Gross property, plant and equipment	951,387	935,884	897,461
Less accumulated depreciation, depletion and amortization	461,754	445,848	384,621
Net property, plant and equipment	489,633	490,036	512,840
Advanced coal royalties	7,263	7,311	4,316
Reclamation deposits	75,315	74,921	72,718
Restricted investments and bond collateral	523,483	69,235	87,209
Contractual third-party reclamation receivables, less current portion	88,036	88,303	84,158
Intangible assets, net of accumulated amortization of $14.1 million and $12.4 million at December 31, 2013 and December 31, 2012, respectively	1,099	1,520	3,203
Other assets	17,125	10,320	12,359
Total Assets	1,407,147	946,685	936,115
Current liabilities:	'	'	'
Current installments of long-term debt	48,586	44,343	23,791
Accounts payable and accrued expenses:	'	'	'
Trade	62,598	57,507	52,093
Production Taxes	46,794	41,905	33,228
Workers' compensation	712	717	820
Postretirement medical benefits	13,955	13,955	14,068
SERP	390	390	390
Deferred revenue	16,034	14,068	12,822
Asset retirement obligations	22,227	23,353	22,238
Other current liabilities	24,390	16,790	11,462
Total current liabilities	235,686	213,028	170,912
Long-term debt, less current installments	751,645	295,494	337,198
Workers' compensation, less current portion	6,680	6,744	8,710
Excess of black lung benefit obligation over trust assets	9,376	8,675	8,356
Postretirement medical benefits, less current portion	271,275	270,374	319,775
Pension and SERP obligations, less current portion	23,524	24,176	54,250
Deferred revenue, less current portion	43,299	46,567	56,891
Asset retirement obligations, less current portion	259,036	256,511	241,609
Intangible liabilities, net of accumulated amortization of $12.4 million at December 31, 2013 and $11.4 million at December 31, 2012, respectively	5,339	5,606	6,625
Other liabilities	7,503	7,389	18,020
Total liabilities	1,613,363	1,134,564	1,222,346
Shareholders' deficit:	'	'	'
Preferred stock of $1.00 par value Authorized 5,000,000 shares; Issued and outstanding 159,960 shares at December 31, 2013 and 2012	121	160	160
Common stock of $2.50 par value Authorized 30,000,000 shares; Issued and outstanding 14,592,231 shares at December 31, 2013, and 14,201,411 shares at December 31, 2012, respectively	37,155	36,479	35,502
Other paid-in capital	134,952	134,861	130,852
Accumulated other comprehensive loss	-63,369	-63,595	-148,345
Accumulated deficit	-315,075	-295,784	-289,727
Total Westmoreland Coal Company shareholders' deficit	-206,216	-187,879	-271,558
Noncontrolling interest	'	0	-14,673
Total deficit	-206,216	-187,879	-286,231
Total Liabilities and Shareholders' Deficit	$1,407,147	$946,685	$936,115

Consolidated_Balance_Sheets_Pa

Consolidated Balance Sheets (Parenthetical) (USD $)	Mar. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
In Millions, except Share data, unless otherwise specified
Statement of Financial Position [Abstract]	'	'	'
Intangible assets, accumulated amortization	$14.50	$14.10	$12.40
Intangible liabilities, accumulated amortization	$12.70	$12.40	$11.40
Preferred stock, par value (in USD per share)	$1	$1	$1
Preferred stock, shares authorized	5,000,000	5,000,000	5,000,000
Preferred stock, shares issued	121,223	159,960	159,960
Preferred stock, shares outstanding	121,223	159,960	159,960
Common stock, par value (in USD per share)	$2.50	$2.50	$2.50
Common stock, shares authorized	30,000,000	30,000,000	30,000,000
Common stock, shares issued	14,862,595	14,592,231	14,201,411
Common stock, shares outstanding	14,862,595	14,592,231	14,201,411

Consolidated_Statements_of_Ope

Consolidated Statements of Operations (USD $)	3 Months Ended		12 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Mar. 31, 2014	Mar. 31, 2013	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Income Statement [Abstract]	'	'	'	'	'
Revenues	$180,202	$161,448	$674,686	$600,437	$501,713
Costs, expenses and other:	'	'	'	'	'
Cost of sales	138,630	130,421	535,320	466,521	392,787
Depreciation, depletion and amortization	16,059	14,426	67,231	57,145	45,594
Selling and administrative	13,331	11,887	50,721	49,908	40,276
Heritage health benefit expenses	3,544	3,951	13,418	13,388	18,575
Loss (gain) on sales of assets	38	-234	-74	528	640
Restructuring charges	397	0	5,078	0	0
Other operating income	150	-4,737	-22,370	-15,925	-6,785
Total costs, expenses and other	172,149	155,714	649,324	571,565	491,087
Operating income	8,053	5,734	25,362	28,872	10,626
Other income (expense):	'	'	'	'	'
Interest expense	-20,798	-10,160	-39,937	-42,677	-29,769
Loss on extinguishment of debt	'	'	-64	-1,986	-17,030
Interest income	302	297	1,366	1,496	1,444
Other income (loss)	93	70	364	723	-2,572
Total other income (expense)	-27,193	-9,793	-38,271	-42,444	-47,927
Loss before income taxes	-19,140	-4,059	-12,909	-13,572	-37,301
Income tax expense (benefit)	-110	28	-4,782	90	-426
Net loss	-19,030	-4,087	-8,127	-13,662	-36,875
Less net loss attributable to noncontrolling interest	0	-1,702	-3,430	-6,436	-3,775
Net loss attributable to the Parent company	-19,030	-2,385	-4,697	-7,226	-33,100
Less preferred stock dividend requirements	261	340	1,360	1,360	1,360
Net loss applicable to common shareholders	($19,291)	($2,725)	($6,057)	($8,586)	($34,460)
Net income (loss) per share applicable to common shareholders:	'	'	'	'	'
Basic and diluted (in dollars per share)	($1.30)	($0.19)	($0.42)	($0.61)	($2.61)
Weighted average number of common shares outstanding:	'	'	'	'	'
Basic and diluted (in shares)	14,787	14,282	14,491	14,033	13,192

Consolidated_Statements_of_Com

Consolidated Statements of Comprehensive Income (Loss) (USD $)	3 Months Ended		12 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2014	Mar. 31, 2013	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Statement of Comprehensive Income [Abstract]	'	'	'	'	'
Net loss	($19,030)	($4,087)	($8,127)	($13,662)	($36,875)
Other comprehensive income (loss):	'	'	'	'	'
Amortization of accumulated actuarial gains or losses, pension	359	741	3,490	2,960	1,647
Adjustments to accumulated actuarial losses and transition obligations, pension	'	'	28,974	-9,812	-15,798
Amortization of accumulated actuarial gains or losses, transition obligations, and prior service costs, postretirement medical benefit	5	1,001	4,005	2,572	-288
Adjustments to accumulated actuarial gains and transition obligations, postretirement medical benefits	'	'	53,230	-22,342	-49,136
Tax effect of other comprehensive income gains	-138	0	-4,892	0	0
Unrealized and realized gains and losses on available-for-sale securities	'	'	-57	-268	-200
Other comprehensive income (loss)	226	1,742	84,750	-26,890	-63,775
Comprehensive income (loss) attributable to Westmoreland Coal Company	($18,804)	($2,345)	$76,623	($40,552)	($100,650)

Consolidated_Statements_of_Sha

Consolidated Statements of Shareholders' Deficit (USD $)	Total	Preferred Stock	Common Stock	Other Paid-in Capital	Accumulated Other Comprehensive Loss	Accumulated Deficit	Non-controlling Interest
Beginning balance at Dec. 31, 2010	($162,355,000)	$160,000	$27,901,000	$98,466,000	($57,680,000)	($226,740,000)	($4,462,000)
Beginning balance, shares at Dec. 31, 2010	'	160,129	11,160,798	'	'	'	'
Preferred dividends declared	-21,301,000	'	'	'	'	-21,301,000	'
Common stock issued as compensation	4,721,000	'	600,000	4,121,000	'	'	'
Common stock issued as compensation, shares	'	'	240,118	'	'	'	'
Common stock options exercised	422,000	'	78,000	344,000	'	'	'
Exercised (in shares)	'	'	-31,200	'	'	'	'
Conversion of convertible notes and securities	25,485,000	'	4,698,000	20,787,000	'	'	'
Conversion of convertible notes and securities, shares	'	-169	1,879,098	'	'	'	'
Common stock issued to pension plans assets	4,257,000	'	1,125,000	3,132,000	'	'	'
Common stock issued to pension plans assets, shares	'	'	450,000	'	'	'	'
Issuance of restricted stock	-437,000	'	125,000	-562,000	'	'	'
Issuance of restricted stock, shares	'	'	50,165	'	'	'	'
Net loss	-36,875,000	'	'	'	'	-33,100,000	-3,775,000
Other comprehensive loss	-63,775,000	'	'	'	-63,775,000	'	'
Ending balance at Dec. 31, 2011	-249,858,000	160,000	34,527,000	126,288,000	-121,455,000	-281,141,000	-8,237,000
Ending balance, shares at Dec. 31, 2011	'	159,960	13,811,379	'	'	'	'
Preferred dividends declared	-1,360,000	'	'	'	'	-1,360,000	'
Common stock issued as compensation	6,040,000	'	808,000	5,232,000	'	'	'
Common stock issued as compensation, shares	'	'	323,432	'	'	'	'
Issuance of restricted stock	-501,000	'	167,000	-668,000	'	'	'
Issuance of restricted stock, shares	'	'	66,600	'	'	'	'
Net loss	-13,662,000	'	'	'	'	-7,226,000	-6,436,000
Other comprehensive loss	-26,890,000	'	'	'	-26,890,000	'	'
Ending balance at Dec. 31, 2012	-286,231,000	160,000	35,502,000	130,852,000	-148,345,000	-289,727,000	-14,673,000
Ending balance, shares at Dec. 31, 2012	'	159,960	14,201,411	'	'	'	'
Preferred dividends declared	-1,360,000	'	'	'	'	-1,360,000	'
Common stock issued as compensation	5,322,000	'	560,000	4,762,000	'	'	'
Common stock issued as compensation, shares	'	'	224,129	'	'	'	'
Issuance of restricted stock	-336,000	'	417,000	-753,000	'	'	'
Issuance of restricted stock, shares	'	'	166,691	'	'	'	'
Net loss	-8,127,000	'	'	'	'	-4,697,000	-3,430,000
Assumption of noncontrolling interest of subsidiary	18,103,000	'	'	'	'	'	18,103,000
Other comprehensive loss	84,750,000	'	'	'	84,750,000	'	'
Ending balance at Dec. 31, 2013	-187,879,000	160,000	36,479,000	134,861,000	-63,595,000	-295,784,000	0
Ending balance, shares at Dec. 31, 2013	'	159,960	14,592,231	'	'	'	'
Preferred dividends declared	-261,000	'	'	'	'	-261,000	'
Common stock issued as compensation	728,000	'	0	728,000	'	'	'
Common stock issued as compensation, shares	'	'	0	'	'	'	'
Conversion of convertible notes and securities	0	-39,000	662,000	-623,000	'	'	'
Conversion of convertible notes and securities, shares	'	-38,737	264,641	'	'	'	'
SARs exercised	0	'	14,000	-14,000	'	'	'
SARs exercised, shares	'	'	5,723	'	'	'	'
Net loss	-19,030,000	'	'	'	'	-19,030,000	'
Other comprehensive loss	226,000	'	'	'	226,000	'	'
Ending balance at Mar. 31, 2014	($206,216,000)	$121,000	$37,155,000	$134,952,000	($63,369,000)	($315,075,000)	'
Ending balance, shares at Mar. 31, 2014	'	121,223	14,862,595	'	'	'	'

Consolidated_Statements_of_Cas

Consolidated Statements of Cash Flows (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Cash flows from operating activities:	'	'	'
Net loss	($8,127)	($13,662)	($36,875)
Adjustments to reconcile net loss to net cash provided by operating activities:	'	'	'
Depreciation, depletion and amortization	67,231	57,145	45,594
Accretion of asset retirement obligation and receivable	12,681	12,189	10,878
Non-cash tax benefits	-4,892	0	0
Amortization of intangible assets and liabilities, net	665	658	657
Share-based compensation	5,322	6,040	4,721
Loss (gain) on sales of assets	-74	528	640
Amortization of deferred financing costs	3,731	4,358	2,515
Other	-1,001	0	0
Loss on extinguishment of debt	64	1,986	17,030
Gain on sales of investment securities	-3	-165	-150
Loss on derivative instruments	0	0	3,079
Changes in operating assets and liabilities:	'	'	'
Receivables, net	-7,636	-12,855	5,491
Inventories	-2,512	-2,164	-2,125
Excess of black lung benefit obligation over trust assets	319	1,791	4,319
Accounts payable and accrued expenses	13,579	17,399	4,128
Deferred revenue	-9,078	-8,198	-9,918
Income tax payable	-1	0	0
Accrual for workers' compensation	-2,069	-2,096	1,248
Asset retirement obligation	-9,410	-6,943	-6,510
Accrual for postretirement medical benefits	7,721	6,191	-1,643
Pension and SERP obligations	2,388	2,802	-1,278
Other assets and liabilities	11,819	-7,860	2,934
Net cash provided by (used in) operating activities	80,717	57,144	44,735
Cash flows from investing activities:	'	'	'
Additions to property, plant and equipment	-28,591	-21,032	-27,594
Change in restricted investments and bond collateral and reclamation deposits	1,434	-33,892	-5,986
Cash payments related to acquisitions and other	0	-72,522	-4,000
Net proceeds from sales of assets	902	480	687
Proceeds from sale of restricted investments	8,287	4,106	3,350
Receivable from customer for property and equipment purchases	-389	-674	-96
Other	-3,540	0	0
Net cash provided by (used in) investing activities	-21,897	-123,534	-33,639
Cash flows from financing activities:	'	'	'
Change in book overdrafts	310	-253	-724
Borrowings from long-term debt, net of debt discount	0	119,364	142,500
Repayments of long-term debt	-28,088	-44,846	-73,566
Borrowings on revolving lines of credit	7,000	16,500	87,200
Repayments of revolving lines of credit	-7,000	-16,500	-105,600
Debt issuance and other refinancing costs	-182	-5,688	-15,019
Preferred dividends paid	-1,360	-1,360	-21,301
Exercise of stock options	0	0	422
Net cash provided by (used in) financing activities	-29,320	67,217	13,912
Net increase in cash and cash equivalents	29,500	827	25,008
Cash and cash equivalents, beginning of year	31,610	30,783	5,775
Cash and cash equivalents, end of year	61,110	31,610	30,783
Supplemental disclosures of cash flow information:	'	'	'
Cash paid for interest	36,252	34,380	21,199
Cash paid (received) for income taxes	111	-73	-250
Non-cash transactions:	'	'	'
Accrued purchaes of property and equipment	1,112	634	570
Capital leases and other financing sources	$5,371	$1,828	$531

BASIS_OF_PRESENTATION

BASIS OF PRESENTATION	3 Months Ended
	Mar. 31, 2014
Accounting Policies [Abstract]	'
BASIS OF PRESENTATION	'
	BASIS OF PRESENTATION
	The accompanying unaudited consolidated financial statements include accounts of Westmoreland Coal Company, or the Company, or Parent, and its subsidiaries and controlled entities. The Company’s current principal activities, all conducted within the United States, are the production and sale of coal from its mines in Montana, Wyoming, North Dakota and Texas, and the ownership of the Roanoke Valley power plants, or ROVA, in North Carolina. The Company’s activities are primarily conducted through wholly owned subsidiaries. All intercompany transactions and accounts have been eliminated in consolidation.
	The Company’s Kemmerer Mine is owned by its subsidiary Westmoreland Kemmerer, Inc., or Kemmerer. The Company’s Absaloka Mine is owned by its subsidiary Westmoreland Resources, Inc., or WRI. The Beulah, Jewett, Rosebud, and Savage Mines are owned through the Company’s subsidiary Westmoreland Mining LLC, or WML.
	The consolidated financial statements of the Company have been prepared in accordance with United States generally accepted accounting principles and require use of management’s estimates. The financial information contained in this Form 10-Q is unaudited, but reflects all adjustments, which are, in the opinion of management, necessary for a fair presentation of the financial information for the periods shown. Such adjustments are of a normal recurring nature. The results of operations for the three months ended March 31, 2014 are not necessarily indicative of results to be expected for the year ending December 31, 2014.
	These 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, 2013, or the 2013 Form 10-K. The accounting principles followed by the Company are set forth in the Notes to the Company’s consolidated financial statements in its 2013 Form 10-K. Most of the descriptions of the accounting principles and other footnote disclosures previously made have been omitted in this report so long as the interim information presented is not misleading or inconsistent.
	Sherritt Acquisition
	On December 24, 2013, the Company entered into an agreement to acquire the coal operations of Sherritt International Corporation, or Sherritt, which consist of its Prairie and Mountain coal mining operations, collectively referred to as the Sherritt Acquisition. These operations include seven producing thermal coal mines in the Canadian provinces of Alberta and Saskatchewan, a 50% interest in an activated carbon plant and a Char production facility. The preliminary purchase price of $435 million will be made up of $293 million of cash consideration and the assumption of an estimated $142 million of capital lease liabilities, subject to certain adjustments provided for in the agreement, relating to, among other things, working capital, indebtedness, pension plan funding and coal inventory. Acquisition and financing costs of $18.1 million have been expensed for the three months ended March 31, 2014; which includes $6.8 million of loss on foreign exchange as described in Note 8, $6.1 million of interest expense on the New Notes as described in Note 4, $4.9 million included in Interest expense related to a bridge facility commitment fee, and $0.3 million of other expenses included in Selling and administrative costs. The Company expects this acquisition to be completed during the second quarter of 2014.
	Debt Obligations
	The Company is subject to three major debt arrangements: (1) $81.0 million in aggregate principal amount of senior secured notes at WML that are collateralized by all assets of WML, Westmoreland Savage Corporation, or WSC, Western Energy Company, or WECO, and Dakota Westmoreland Corporation, or DWC; and (2) $251.5 million in aggregate principal amount of senior secured notes at the Parent level that are collateralized by the assets of the Parent, WRI, Kemmerer and ROVA; and (3) $425.0 million in aggregate principal amount of 10.75% senior secured notes, referred to as the New Notes, which are also collateralized by the assets of the Parent, WRI, Kemmerer and ROVA. The proceeds from the New Notes will be used primarily to pay the purchase price and related expenses for the Sherritt Acquisition, to prepay the outstanding senior secured notes issued of WML debt, and for working capital. The proceeds are being held in escrow pending the completion of the Sherritt Acquisition. See Note 4 for additional details.
	Business Interruption Insurance
	The Company received business interruption insurance proceeds for the three months ended March 31, 2014 due to an explosion and subsequent fire at a customer’s facility that occurred in November 2011. Operations at that facility resumed during October 2013. The Company recognizes income as business interruption losses are incurred and reimbursement is virtually assured. The Company reports this income in Other operating income and recognized nil and $4.8 million of income for the three months ended March 31, 2014 and 2013, respectively. The Company received $4.6 million of cash proceeds for the three months ended March 31, 2014 related to income recorded in 2013. Insurance proceeds are included in Net cash provided by operating activities. As of March 31, 2014, the Company has collected all cash proceeds related to income recognized.
	Derivatives
	The Company utilized foreign exchange derivatives to manage exposure to fluctuations in the exchange rates of the Canadian dollar regarding the Sherritt acquisition. The Company does not utilize derivative financial instruments for trading purposes or for speculative purposes. The Company's derivative instruments are recorded on the Consolidated Balance Sheets in Other current assets and Other current liabilities at fair value with changes in fair value recognized in the statement of operations at the end of each period in Loss on foreign exchange.
	Income Taxes
	The difference between the statutory income tax rate and the effective income tax rate is due to a change in the valuation allowance recorded against the net deferred tax assets.
	Restructuring Charges
	In 2013, the Company entered into an agreement with Dominion Virginia Power, a subsidiary of Dominion, to restructure the remaining five years of the ROVA I and ROVA II contracts. During the first quarter of 2014, the Company recorded a restructuring charge of $0.4 million for additional contractual obligations. The Company expects that the $5.1 million of accruals will be paid out in the second quarter of 2014.
	The table below represents the restructuring provision activity during the three months ended March 31, 2014 (in millions):
	Beginning Balance		Restructuring Charges		Restructuring Payments		Ending Balance
	$	5.1	$	0.4	$	0.4	$	5.1
	Recently Adopted Accounting Pronouncements
	The Company did not adopt any new accounting pronouncements during the three months ended March 31, 2014.

SUMMARY_OF_SIGNIFICANT_ACCOUNT

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES	12 Months Ended
	Dec. 31, 2013
Accounting Policies [Abstract]	'
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES	'
	SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES
	Nature of Operations
	Westmoreland Coal Company, or the Company, Westmoreland, WCC, or the Parent, is an energy company. The Company’s current principal activities, all conducted within the United States, are the production and sale of coal from its mines in Montana, Wyoming, North Dakota and Texas; and the ownership of power plants in North Carolina. The Company’s activities are primarily conducted through wholly owned subsidiaries.
	The Company's Kemmerer Mine is owned by its subsidiary Westmoreland Kemmerer, Inc., or Kemmerer. The Company’s Absaloka Mine is owned by its wholly owned subsidiary Westmoreland Resources, Inc., or WRI. The right to mine coal at the Absaloka Mine had been subleased to an affiliated entity whose operations the Company controls, under which the sublease expired December 31, 2013; and as a result the right to mine coal at the Absaloka Mine reverts to WRI beginning in 2014. The Rosebud, Jewett, Beulah and Savage Mines are owned through the Company’s wholly owned subsidiary Westmoreland Mining LLC, or WML.
	Sherritt Acquisition
	On December 24, 2013, the Company entered into an agreement to acquire the coal operations of Sherritt International Corporation, or Sherritt, which consist of its Prairie and Mountain coal mining operations. These operations included seven producing thermal coal mines in the Canadian provinces of Alberta and Saskatchewan, a 50% interest in an activated carbon plant and a Char production facility. The purchase price of $435.0 million will be made up of $293.0 million of cash consideration and the assumption of an estimated $142 million of capital lease liabilities, subject to certain adjustments provided for in the agreement, relating to, among other things, working capital, indebtedness, pension plan funding and coal inventory. Acquisition-related costs of $2.9 million have been expensed for the year ended December 31, 2013, and are included in Selling and administrative costs. The Company expects this acquisition to be completed by the end of the first quarter of 2014.
	On February 7, 2014, the Company closed on a private offering of $425.0 million in aggregate principal amount of 10.75% Senior Secured Notes due 2018 at a price of 106.875% plus accrued interest from February 1, 2014; referred to as the New Notes. The net proceeds of the offering of the new notes will finance the approximately $293 million cash portion of the purchase price, an estimated $58 million to satisfy the cash bonding obligations for the Sherritt mines and cash transaction costs associated with the acquisition and this offering of new notes of approximately $26.0 million. The remaining balance of the proceeds will be used to fund the prepayment of the WML Notes and for other general corporate purposes. The proceeds will be held in escrow pending the completion of the acquisition.
	In connection with the acquisition, the Company intends to amend the existing corporate revolving credit agreement to increase the maximum available borrowing amount to approximately $60 - $70 million (which the Company may increase to $100 million at their discretion), with a subfacility for letters of credit in an amount of up to $30 million. The acquisition is not contingent on the Company increasing such available borrowing capacity and it is possible that such increase will not be implemented until after the consummation of the acquisition.
	Consolidation Policy
	The Consolidated Financial Statements of Westmoreland Coal Company include the accounts of the Company and its controlled subsidiaries. The Company consolidates any variable interest entity, or VIE, for which the Company is considered the primary beneficiary. The Company provides for noncontrolling interests in consolidated subsidiaries, in which the Company’s ownership is less than 100 percent. All intercompany accounts and transactions have been eliminated.
	A VIE is an entity that is unable to make significant decisions about its activities or does not have the obligation to absorb losses or the right to receive returns generated by its operations. If the entity meets one of these characteristics, then the Company must determine if it is the primary beneficiary of the VIE. The party exposed to the majority of the risks and rewards with the VIE is the primary beneficiary and must consolidate the entity.
	The Company has determined for all periods presented, it was the primary beneficiary in Absaloka Coal LLC, a VIE, in which it held less than a 50% ownership through December 31, 2013. As a result, the Company has consolidated this entity within the coal segment. The investment in Absaloka Coal LLC by its outside partner did not continue after December 31, 2013, and beginning in 2014, Absaloka Coal LLC will be 100% owned by the Company, but will cease to have operations. As a result, the Company has unwound the transaction as of December 31, 2013 and concerning our balance sheet have decreased Other liabilities by $19.1 million and decreased Noncontrolling interest by $18.1 million. As a result, as of December 31, 2013, the noncontrolling interest was eliminated.
	Use of Estimates
	The preparation of financial statements in conformity with generally accepted accounting principles requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosures of contingent assets and liabilities at the date of the financial statements and reported amounts of revenues and expenses during the reporting period. Actual results could differ from those estimates.
	Cash and Cash Equivalents
	Cash and cash equivalents are stated at cost, which approximate fair value. Cash equivalents consist of highly liquid investments with original maturities of three months or less.
	Trade Receivables
	Trade receivables are recorded at the invoiced amount and do not bear interest. The Company evaluates the need for an allowance for doubtful accounts based on a review of collectability. The Company has determined that no allowance is necessary for trade receivables as of December 31, 2013 and 2012.
	Inventories
	Inventories, which include materials and supplies as well as raw coal, are stated at the lower of cost or market. Cost is determined using the average cost method. Coal inventory costs include labor, supplies, equipment, operating overhead and other related costs.
	Exploration and Mine Development
	Exploration expenditures are charged to Cost of sales as incurred, including costs related to drilling and study costs incurred to convert or upgrade mineral resources to reserves.
	At existing surface operations, additional pits may be added to increase production capacity in order to meet customer requirements. These expansions may require significant capital to purchase additional equipment, relocate equipment, build or improve existing haul roads and create the initial pre-production box cut to remove overburden for new pits at existing operations. If these pits operate in a separate and distinct area of the mine, the costs associated with initially uncovering coal for production are capitalized and amortized over the life of the developed pit consistent with coal industry practices. Once production has begun, mining costs are then expensed as incurred.
	Where new pits are routinely developed as part of a contiguous mining sequence, the Company expenses such costs as incurred. The development of a contiguous pit typically reflects the planned progression of an existing pit, thus maintaining production levels from the same mining area utilizing the same employee group and equipment.
	Property, Plant and Equipment
	Property, plant and equipment are recorded at cost and includes long-term spare parts inventory. Expenditures that extend the useful lives of existing plant and equipment or increase productivity of the assets are capitalized. Maintenance and repair costs that do not extend the useful life or increase productivity of the asset are expensed as incurred. Coal reserves are recorded at cost, or at fair value originally in the case of acquired businesses.
	Coal reserves, mineral rights and mine development costs are depleted based upon estimated recoverable proven and probable reserves. Plant and equipment are depreciated on a straight-line basis over the assets’ estimated useful lives as follows:
		Years
	Buildings and improvements	15 to 30
	Machinery and equipment	3 to 36
	Long-term spare parts inventory begins depreciation when placed in service.
	The Company assesses the carrying value of its property, plant and equipment for impairment whenever events or changes in circumstances indicate that the carrying amount of an asset may not be recoverable. Recoverability is measured by comparing estimated undiscounted cash flows expected to be generated from such assets to their net book value. If net book value exceeds estimated cash flows, the asset is written down to fair value. When an asset is retired or sold, its cost and related accumulated depreciation and depletion are removed from the accounts. The difference between the net book value of the asset and proceeds on disposition is recorded as a gain or loss. Fully depreciated plant and equipment still in use is not eliminated from the accounts. Amortization of capital leases is included in Depreciation, depletion and amortization.
	Reclamation Deposits and Contractual Third-Party Reclamation Receivables
	Certain of the Company’s customers have either agreed to reimburse the Company for reclamation expenditures as they are incurred or have pre-funded a portion of the expected reclamation costs. Amounts received from customers and held on deposit are recorded as reclamation deposits. Amounts that are reimbursable by customers are recorded as third-party reclamation receivables when the related reclamation obligation is recorded.
	Financial Instruments
	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 instruments that contain features that qualify them as embedded derivatives. Except for derivatives that qualify for the normal purchase normal sale exception, all derivative financial instruments are recognized in the balance sheet at fair value. Changes in fair value are recognized in earnings if they are not eligible for hedge accounting or Accumulated other comprehensive income (loss) if they qualify for cash flow hedge accounting.
	Held-to-maturity financial instruments consist of non-derivative financial assets with fixed or determinable payments and a fixed term, which the Company has the ability and intent to hold until maturity, and, therefore, accounts for them as held-to-maturity securities. Held-to-maturity securities are recorded at amortized cost, adjusted for the amortization or accretion of premiums or discounts calculated on the effective interest method. Interest income is recognized when earned.
	The Company has securities classified as available-for-sale, which are recorded at fair value. The changes in fair values are recorded as unrealized gains (losses) as a component of Accumulated other comprehensive income (loss) in shareholders’ deficit.
	The Company reviews its securities routinely for other-than-temporary impairment. The primary factors used to determine if an impairment charge must be recorded because a decline in value of the security is other than temporary include (i) whether the fair value of the investment is significantly below its cost basis, (ii) the financial condition of the issuer of the security, (iii) the length of time that the cost of the security has exceeded its fair value and (iv) the Company’s intent and ability to retain the investment for a period of time sufficient to allow for any anticipated recovery in market value. Other-than-temporary impairments are recorded as a component of Other income (expense).
	Fair Value
	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 a given measurement date. Valuation techniques used must maximize the use of observable inputs and minimize the use of unobservable inputs.
	Fair value hierarchy prioritizes the inputs to valuation techniques used to measure fair value and is defined as:
	•	Level 1, defined as observable inputs such as quoted prices in active markets for identical assets. Level 1 assets include available-for-sale equity securities generally valued based on independent third-party market prices.
	•	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 Company’s non-recurring fair value measurements include asset retirement obligations and the purchase price allocations for the fair value of assets and liabilities acquired through business combinations.
	The Company determines the estimated fair value of its asset retirement obligations by calculating the present value of estimated cash flows related to reclamation liabilities using level 3 inputs. The significant inputs used to calculate such liabilities includes estimates of costs to be incurred, the Company’s credit adjusted discount rate, inflation rates and estimated dates of reclamation. The asset retirement liability is accreted to its present value each period and the associated mineral rights are depleted using the units-of-production method.
	The fair value of assets and liabilities acquired through business combinations is calculated using a discounted-cash flow approach using level 3 inputs. Cash flow estimates require forecasts and assumptions for many years into the future for a variety of factors.
	See Notes 4, 7, 9, 10 and 11 for further disclosures related to the Company’s fair value estimates.
	Intangible Assets and Liabilities
	Identifiable intangible assets or liabilities acquired in a business combination must be recognized and reported separately from goodwill. The Company has determined that its most significant acquired identifiable intangible assets and liabilities are related to sales and purchase agreements. Intangible assets result from more favorable market prices than contracted prices in sales and purchase agreements as measured during a business combination. Intangible liabilities result from less favorable market prices than contracted prices in sales and purchase agreements as measured during a business combination. The majority of these intangible assets and liabilities are amortized on a straight-line basis over the respective period of the sales and purchase agreements, while the remainder are amortized on a unit-of-production basis.
	Amortization of intangible assets recognized in Cost of sales was $1.7 million in 2013, 2012, and 2011. Amortization of intangible liabilities recognized in Revenues was $1.0 million in 2013, 2012, and 2011.
	The estimated aggregate amortization amounts from intangibles assets and liabilities for each of the next five years as of December 31, 2013 are as follows:
		Amortization
		Expense
		(Revenue)
		(In thousands)
	2014	$	17
	2015	(791		)
	2016	(953		)
	2017	(953		)
	2018	(953		)
	Workers’ Compensation Benefits
The Company is self-insured for workers’ compensation claims incurred prior to 1996. The liabilities for workers’ compensation claims are actuarially determined estimates of the ultimate losses incurred based on the Company’s experience. Adjustments to the probable ultimate liabilities are made annually based on subsequent developments and experience and are included in operations at the time of the revised estimate.
The Company insures its current employees through third-party insurance providers and state arrangements.
Pneumoconiosis (Black Lung) Benefits
The Company is self-insured for federal and state black lung benefits for former heritage employees and has established an independent trust to pay these benefits. The Company accounts for these benefits on the accrual basis. An independent actuary annually calculates the present value of the accumulated black lung obligation. The underfunded status in 2013 and 2012 of the Company’s obligation is included as Excess of black lung benefit obligation over trust assets in the accompanying consolidated balance sheets. Actuarial gains and losses are recognized in the period in which they arise.
The Company insures its current represented employees through arrangements with its unions and its current non-represented employees are insured through third-party insurance providers.
Postretirement Health Care Benefits
The Company accrues the cost to provide the benefits over the employees’ period of active service for postretirement benefits other than pensions. These costs are determined on an actuarial basis. The Company’s consolidated balance sheet reflects the unfunded status of postretirement benefit obligations.
Pension and SERP Plans
The Company accrues the cost to provide the benefits over the employees’ period of active service for the non-contributory defined benefit pension and SERP plans it sponsors. These costs are determined on an actuarial basis. The Company’s consolidated balance sheet reflects the unfunded status of the defined benefit pension and SERP plans.
Deferred Revenue
Deferred revenues represent funding received upon the negotiation of long-term contracts. The deferred revenues for coal will be recognized as deliveries of the reserved coal are made in accordance with the long-term coal contracts. Deferred power revenues are recognized on a pro rata basis, based on the payments estimated to be received over the remaining term of the power sales agreements.
Asset Retirement Obligations
The Company’s asset retirement obligation, or ARO, liabilities primarily consist of estimated costs to reclaim surface land and support facilities at its mines and power plants in accordance with federal and state reclamation laws as established by each mining permit.
The Company estimates its ARO liabilities for final reclamation and mine closure based upon detailed engineering calculations of the amount and timing of the future costs for a third party to perform the required work. These estimates are based on projected pit configurations at the end of mining and are escalated for inflation, and then discounted at a credit-adjusted risk-free rate. The Company records mineral rights associated with the initial recorded liability. Mineral rights are amortized based on the units of production method over the estimated recoverable, proven and probable reserves at the related mine, and the ARO liability is accreted to the projected settlement date. Changes in estimates could occur due to revisions of mine plans, changes in estimated costs, and changes in timing of the performance of reclamation activities.
Income Taxes
Deferred income taxes are provided for temporary differences arising from differences between the financial statement amount and tax basis of assets and liabilities existing at each balance sheet date using enacted tax rates anticipated to be in effect when the related taxes are expected to be paid or recovered. A valuation allowance is established if it is more likely than not that a deferred tax asset will not be realized. In determining the need for a valuation allowance, the Company considers projected realization of tax benefits based on expected levels of future taxable income, available tax planning strategies and its overall deferred tax position.
Accounting guidance prescribes a recognition threshold and measurement attribute for the financial statement recognition and measurement of a tax position taken or expected to be taken in a tax return. Under this guidance, a company can recognize the benefit of an income tax position only if it is more likely than not (greater than 50%) that the tax position will be sustained upon tax examination, based solely on the technical merits of the tax position. Guidance is also provided on the derecognition, classification, interest and penalties, accounting in interim periods, disclosure and transition.
The Company includes interest and penalties related to income tax matters in Income tax expense.
The tax effect of pretax income or loss from continuing operations is generally determined by a computation that does not consider the tax effects of items that are not included in continuing operations. The exception to that incremental approach is that all items (for example, items recorded in other comprehensive income, extraordinary items, and discontinued operations) be considered in determining the amount of tax benefit that results from a loss from continuing operations and that shall be allocated to continuing operations.
Deferred Financing Costs
The Company capitalizes costs incurred in connection with borrowings or establishment of credit facilities and issuance of debt securities. These costs are amortized as an adjustment to interest expense over the life of the borrowing or term of the credit facility using the effective interest method. These amounts are recorded in Other assets in the accompanying consolidated balance sheets.
Coal Revenues
The Company recognizes coal sales revenue at the time title passes to the customer in accordance with the terms of the underlying sales agreements and after any contingent performance obligations have been satisfied. Coal sales revenue is recognized based on the pricing contained in the contracts in place at the time that title passes.
Power Revenues
ROVA supplies power under long-term power sales agreements. Under these agreements, ROVA invoices and collects capacity payments based on kilowatt-hours produced if the units are dispatched or for the kilowatt-hours of available capacity if the units are not fully dispatched.
A portion of the capacity payments under the agreements is considered to be an operating lease. The Company is recognizing amounts invoiced under the power sales agreements as revenue on a pro rata basis, based on the weighted average per kilowatt hour capacity payments estimated to be received over the remaining term of the power sales agreements. Under this method of recognizing revenue, $8.7 million and $8.3 million of previously deferred revenue was recognized during 2013 and 2012, respectively.
On December 23, 2013, the Company entered into an agreement with Dominion Virginia Power, a subsidiary of Dominion, to restructure the remaining five years of the ROVA I and ROVA II contracts. From January 2014 through March 2019, the Company will keep ROVA ready to operate and expects to run the plants during high demand energy periods. The Company will additionally buy power from a power provider at a fixed price, and will supply Dominion that power. The Company can also operate the plant and sell power on the open market if it it chooses.
The Company incurred restructuring charges of $5.1 million for the year ended December 31, 2013 primarily related to legal and consulting fees. The restructuring plan is expected to be complete by March 31, 2014. The Company expects that the aggregate $5.1 million of expenditures will be cash expenditures paid out in the first quarter of 2014.
The table below represents the restructuring provision activity during the year ended December 31, 2013 (in millions):
Beginning Balance				Restructuring Charges			Restructuring Payments		Ending Balance
$	—			$	5.1		$	—	$	5.1
Other Operating Income (Loss)
Other operating income in the accompanying Consolidated Results of Operations reflects income from sources other than coal or power revenues. Income from the Company’s Indian Coal Tax Credit monetization transaction is recorded as Other operating income. The Company recognizes income as business interruption losses are incurred and reimbursement is virtually assured and has recognized $16.2 million and $17.3 million of income during 2013 and 2012, respectively; which is included in Other operating income. Insurance proceeds are included in Net cash provided by operating activities.
Share-Based Compensation
Share-based compensation expense is generally measured at the grant date and recognized as expense over the vesting period of the entire award. These costs are recorded in Cost of sales and Selling and administrative expenses in the accompanying consolidated results of operations.
Earnings (Loss) per Share
Basic earnings (loss) per share have 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 convertible notes, stock options, stock appreciation rights, restricted stock and warrants. No such items were included in the computation of diluted loss per share for the years ended 2013, 2012 or 2011 because the Company incurred a loss from operations in each of these periods and the effect of inclusion would have been anti-dilutive.
The table below shows the number of shares that were excluded from the calculation of diluted loss per share because their inclusion would be anti-dilutive to the calculation:
	Years Ended December 31,
	2013			2012		2011
	(In thousands)
Convertible notes and securities	1,093			1,093		1,093
Restricted stock units, stock options, and SARs	805			978		634
Total shares excluded from diluted shares calculation	1,898			2,071		1,727
Recently Adopted Accounting Pronouncements
Effective January 1, 2013, the Company adopted an accounting standards update which requires that companies present either in a single note or parenthetically on the face of the financial statements, the effect of significant amounts reclassified from each component of accumulated other comprehensive income based on its source and the income statement line items affected by the reclassification. If a component is not required to be reclassified to net income in its entirety, companies would instead cross reference to the related footnote for additional information. This accounting standards update only affects the Company's disclosures.
Liquidity and Capital Resources
The Parent is a holding company and conducts its operations through subsidiaries. The Parent has significant cash requirements to fund debt obligations, ongoing heritage health benefit costs, pension contributions, and corporate overhead expenses. The principal sources of cash flow to the Parent are distributions from principal operating subsidiaries. The cash at ROVA, Kemmerer, and WRI has no restrictions and is immediately available. The cash at WML is available to the Parent through quarterly distributions. The WML credit agreement requires a debt service account and imposes timing and other restrictions on the ability of WML to distribute funds to the Parent. The cash at WRMI is also available to the Parent through dividends and is subject to maintaining a statutory minimum level of capital, which is two hundred fifty thousand dollars.
The Company anticipates that its cash from operations, cash on hand and available borrowing capacity will be sufficient to meet its investing, financing, and working capital requirements for the foreseeable future.
In March 2013, the Company amended the WML Revolving Credit Agreement by extending the maturity date from June 26, 2013 to December 31, 2017. WML's revolving line of credit has a borrowing limit of $25.0 million. The interest rate under the revolving line of credit at December 31, 2013 was 3.75% per annum. At December 31, 2013, WML had no outstanding balance under the revolving line of credit and the revolving line of credit supports a letter of credit of $1.9 million, leaving it with $23.1 million of borrowing availability. WML's revolving line of credit is only available to fund the operations of its respective subsidiaries.
On June 29, 2012, the Company and certain of its subsidiaries entered into a five-year, $20.0 million revolving line of credit permitted under the indenture governing the 10.75% Senior Notes with an expiration date of June 30, 2017. The revolver may support up to $2.0 million of letters of credit (which was increased to $10.0 million on January 10, 2014), which would reduce the balance available under the revolver. At December 31, 2013, availability on the revolver was $20.0 million with no outstanding balance and no supported letters of credit. All extensions of credit under the revolver are collateralized by a first priority security interest in and lien upon the inventory and accounts receivable of the Parent, WRI, Kemmerer, and ROVA. Pursuant to the Intercreditor Agreement, the holders of the 10.75% Senior Notes now have a subordinate lien on these assets.

ACQUISITION

ACQUISITION	12 Months Ended
	Dec. 31, 2013
Business Combinations [Abstract]	'
ACQUISITION	'
	ACQUISITION
	On December 23, 2011, the Company, through Westmoreland Kemmerer, Inc., entered into a purchase and sale agreement with Chevron Mining Inc., a Missouri corporation (the “Seller”), pursuant to which the Company agreed to purchase from Seller the Kemmerer surface coal mine, associated processing facilities and other related real and personal property assets located in Kemmerer, Wyoming and assumed certain liabilities related to the mine. The Company did not acquire working capital in the acquisition, other than inventory.
	On January 31, 2012, the Company closed on the acquisition of the Kemmerer Mine from the Seller. In addition, on January 31, 2012, the Company completed the issuance and sale of $125.0 million aggregate principal amount of 10.75% senior secured notes due 2018 (the “Add-On Notes”) at a price equal to approximately 95.5% of their face value.
	The purchase consideration for the Kemmerer Mine was $164.5 million, which included $76.5 million paid in cash, plus the assumption of approximately $88.0 million of liabilities. The net proceeds of the Add-On Notes financed the $76.5 million cash portion of the purchase consideration, $24.7 million of cash bonding obligations for the Kemmerer Mine and paid cash transaction costs for the Kemmerer acquisition and the Add-On Notes. Acquisition-related costs of $1.6 million have been expensed and are included in Selling and administrative costs. Issuance costs related to the Add-On Notes of $5.1 million have been capitalized. The balance of the net proceeds of the Add-On Notes was used to fund working capital requirements necessary to integrate the Kemmerer operations with the Company's operations.
	The Kemmerer 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.
	The Company has finalized the purchase price allocation for the Kemmerer acquisition. No significant goodwill or other intangible assets were evident in the acquisition.
	A summary of the purchase consideration and allocation of the purchase consideration follow (in millions):
		Final as of
		December 31,
		2012
	Purchase consideration:
	Cash paid	$	76.5
	Fair value of liabilities assumed:
	Postretirement medical cost obligations	49.2
	Asset retirement obligations	19.4
	Pension obligations	15.6
	Deferred revenue	2.2
	Accrued liabilities	1.6
	Total fair value of liabilities assumed	88
	Total purchase consideration	$	164.5
	Allocation of purchase consideration:
	Inventories	$	9.6
	Land and mineral rights	65.5
	Plant and equipment	89.4
	Total	$	164.5
	The following unaudited pro forma information has been prepared for illustrative purposes only and assumes the acquisition occurred on January 1, 2011. 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 acquisition occurred on January 1, 2011, or of future results of operations.
		Years Ended
		31-Dec-12			31-Dec-11
		(In thousands)
	Total Revenues
	As reported	$	600,437		$	501,713
	Pro forma	$	614,550		$	645,595
	Operating Income
	As reported	$	28,872		$	10,626
	Pro forma	$	31,146		$	13,275
	Net income (loss) applicable to common shareholders
	As reported	$	(8,586	)	$	(34,460	)
	Pro forma	$	(7,524	)	$	(46,260	)
	Net income (loss) per share applicable to common shareholders
	As reported	$	(0.61	)	$	(2.61	)
	Pro forma	$	(0.54	)	$	(3.51	)

INVENTORIES

INVENTORIES	3 Months Ended							12 Months Ended
	Mar. 31, 2014							Dec. 31, 2013
Inventory Disclosure [Abstract]	'							'
INVENTORIES	'							'
	INVENTORIES							INVENTORIES
	Inventories consisted of the following:							Inventories consisted of the following:
		March 31, 2014			December 31, 2013				December 31,
		(In thousands)							2013			2012
	Coal stockpiles	$	1,189		$	543			(In thousands)
								Coal stockpiles	$	543		$	989
	Coal fuel inventories	1,844			6,161
								Coal fuel inventories	6,161			3,048
	Materials and supplies	33,189			34,233
								Materials and supplies	34,233			34,954
	Reserve for obsolete inventory	(775		)	(965		)
	Total	$	35,447		$	39,972		Reserve for obsolete inventory	(965		)	(1,257		)
								Total	$	39,972		$	37,734

RESTRICTED_INVESTMENTS_AND_BON

RESTRICTED INVESTMENTS AND BOND COLLATERAL	3 Months Ended							12 Months Ended
	Mar. 31, 2014							Dec. 31, 2013
Disclosure Restricted Investments and Bond Collateral [Abstract]	'							'
RESTRICTED INVESTMENTS AND BOND COLLATERAL	'							'
	RESTRICTED INVESTMENTS AND BOND COLLATERAL							RESTRICTED INVESTMENTS AND BOND COLLATERAL
	The Company’s restricted investments and bond collateral consist of the following:							The Company’s restricted investments and bond collateral consist of the following:
		March 31, 2014			31-Dec-13				December 31,
		(In thousands)							2013			2012
	Coal Segment:								(In thousands)
	WML debt reserve account	$	13,068		$	13,067		Coal Segment:
								WML debt reserve account	$	13,067		$	13,062
	Reclamation bond collateral:
	Kemmerer Mine	24,944			24,966			Reclamation bond collateral:
								Kemmerer Mine	24,966			24,702
	Absaloka Mine	11,670			11,653
								Absaloka Mine	11,653			14,507
	Rosebud Mine	3,145			3,145
								Rosebud Mine	3,145			12,495
	Beulah Mine	1,270			1,270
								Beulah Mine	1,270			1,270
	Power Segment:
	Letter of credit account	—			5,998			Power Segment:
								Letter of credit account	5,998			5,990
	Corporate Segment:
	Proceeds from the New Notes held in escrow	454,219			—			Corporate Segment:
								Postretirement medical benefit bonds	8,467			8,593
	Other requirements for Sherritt Acquisition held in escrow	16,900			—
								Workers’ compensation bonds	6,667			6,590
	Postretirement medical benefit bonds	8,481			8,467
								Total restricted investments and bond collateral	75,233			87,209
	Workers’ compensation bonds	6,686			6,667
								Less current portion	(5,998		)	—
	Total restricted investments and bond collateral	540,383			75,233
								Total restricted investments and bond collateral, less current portion	$	69,235		$	87,209
	Less current portion	(16,900		)	(5,998		)
	Total restricted investments and bond collateral, less current portion	$	523,483		$	69,235		The Company’s carrying value and estimated fair value of its restricted investments and bond collateral at December 31, 2013 are as follows:
	For all of its restricted investments and bond collateral accounts, the Company can select from limited fixed-income investment options for the funds and receive the investment returns on these investments. Funds in the restricted investments and bond collateral accounts are not available to meet the Company’s general cash needs. Net proceeds from the New Notes (see Note 4) are held in escrow pending the completion of the Sherritt Acquisition and are held entirely in cash. Other requirements for the Sherritt Acquisition include cash required to be deposited in a restricted account for interest accrued as of March 31, 2014 for the New Notes and other fees expected to be paid in connection with the Sherritt Acquisition.								Carrying Value			Fair Value
									(In thousands)
	These accounts include held-to-maturity securities. Held-to-maturity securities are recorded at amortized cost, adjusted for the amortization or accretion of premiums or discounts calculated on the effective interest method. Interest income is recognized when earned.							Cash and cash equivalents	$	40,605		$	40,605
	The Company’s carrying value and estimated fair value of its restricted investments and bond collateral at March 31, 2014 are as follows:							Time deposits	2,444			2,444
								Held-to-maturity securities	32,184			32,046
		Carrying Value			Fair Value
		(In thousands)							$	75,233		$	75,095
	Cash and cash equivalents	$	503,391		$	503,391
								In 2013, 2012, and 2011, the Company recorded a gain of less than $0.1 million, $0.1 million, and $0.1 million, respectively, on the sale of available-for-sale securities held as restricted investments and bond collateral.
	Time deposits	2,444			2,444			In 2013, $3.0 million and $9.4 million of reclamation bond collateral has been released from restriction regarding the Absaloka and Rosebud Mines, respectively.
								The $6.0 million letter of credit account in the power segment has been released from restriction in February, 2014 and as a result is included as current portion.
	Held-to-maturity securities	34,548			34,707			Coal Segment
								Pursuant to the terms of the Note Purchase Agreement dated June 26, 2008, WML must maintain a debt service reserve account. The debt service reserve account is required to contain funds sufficient to pay the principal, interest, and collateral agent’s fees scheduled to be paid in the following six months. The debt service reserve account was fully funded at December 31, 2013.
		$	540,383		$	540,542		As of December 31, 2013, the Company had reclamation bond collateral in place for its Kemmerer, Absaloka, Rosebud and Beulah Mines. Bond collateral is not required at the Jewett Mine as reclamation bonding is the responsibility of its customer. These government-required bonds assure that coal-mining operations comply with applicable federal and state regulations relating to the performance and completion of final reclamation activities. The amounts deposited in the bond collateral account secure the bonds issued by the bonding company.
								Power Segment
	Held-to-Maturity Restricted Investments and Bond Collateral							As of February, 2014, the Company will no longer be required to fund a letter of credit account for its power operations.
								Corporate Segment
	The amortized cost, gross unrealized holding gains and fair value of held-to-maturity securities at March 31, 2014 is as follows (in thousands):							The Company is required to obtain surety bonds in connection with its self-insured workers’ compensation plan and certain health care plans. The Company’s surety bond underwriters require collateral to issue these bonds.
								Held-to-Maturity and Available-for-Sale Restricted Investments and Bond Collateral
								The amortized cost, gross unrealized holding gains and losses and fair value of held-to-maturity securities are as follows:
	Amortized cost	$	34,548
	Gross unrealized holding gains	440							December 31,
									2013			2012
	Gross unrealized holding losses	(281		)					(In thousands)
	Fair value	$	34,707					Amortized cost	$	32,184		$	3,983
	Maturities of held-to-maturity securities are as follows at March 31, 2014:							Gross unrealized holding gains	309			356
								Gross unrealized holding losses	(447		)	—
		Amortized Cost			Fair Value
		(In thousands)						Fair value	$	32,046		$	4,339
	Due within one year	$	1,193		$	1,217
								Maturities of held-to-maturity securities are as follows at December 31, 2013:
Due in five years or less	19,539			19,752
Due after five years to ten years	6,718			6,717				Amortized Cost			Fair Value
								(In thousands)
Due in more than ten years	7,098			7,021			Due within one year	$	1,111		$	1,143
	$	34,548		$	34,707		Due in five years or less	17,839			17,944
							Due after five years to ten years	6,769			6,665
The Company does not intend to sell its held-to-maturity securities and it is not more likely than not that the Company will be required to sell the securities before recovery of amortized cost bases, which may be at maturity.
							Due in more than ten years	6,465			6,294
As of February 2014, the Company is no longer required to fund a letter of credit account for its power operations.
								$	32,184		$	32,046
							The cost basis, gross unrealized holding gains and fair value of available-for-sale securities are as follows:
								December 31,
								2013			2012
								(In thousands)
							Cost basis	$	—		$	175
							Gross unrealized holding gains	—			16
							Fair value	$	—		$	191

LINES_OF_CREDIT_AND_LONGTERM_D

LINES OF CREDIT AND LONG-TERM DEBT	3 Months Ended							12 Months Ended
	Mar. 31, 2014							Dec. 31, 2013
Debt Disclosure [Abstract]	'							'
LINES OF CREDIT AND LONG-TERM DEBT	'							'
	LINES OF CREDIT AND LONG-TERM DEBT							LINES OF CREDIT AND LONG-TERM DEBT
	The amounts outstanding under the Company’s long-term debt consisted of the following as of the dates indicated:							The amounts outstanding under the Company’s long-term debt consisted of the following as of the dates indicated:
		Total Debt Outstanding							Total Debt Outstanding
		March 31, 2014			December 31, 2013				December 31,
		(In thousands)							2013			2012
	10.75% Senior Notes due 2018	$	251,500		$	251,500			(In thousands)
								10.75% senior notes due 2018	$	251,500		$	252,000
	New Notes - 10.75% senior notes due 2018	425,000			—
								WML term debt due 2018	85,500			103,500
	8.02% WML term debt due 2018	81,000			85,500
								Capital lease obligations	10,153			13,926
	Capital lease obligations	21,465			10,153
								Other	1,209			1,654
	Other	1,093			1,209
								Debt discount	(8,525		)	(10,091		)
	Debt premium (discount), net	20,173			(8,525		)	Total debt outstanding	339,837			360,989
	Total debt outstanding	800,231			339,837			Less current portion	(44,343		)	(23,791		)
								Total debt outstanding, less current portion	$	295,494		$	337,198
	Less current installments	(48,586		)	(44,343		)
	Total debt outstanding, less current installments	$	751,645		$	295,494		The following table presents aggregate contractual debt maturities of all long-term debt:
	The following table presents aggregate contractual debt maturities of all long-term debt:								As of December 31, 2013
									(In thousands)
								2014	$	23,949
		As of March 31, 2014
		(In thousands)						2015	22,662
	2014	$	19,569
								2016	21,943
	2015	24,710
								2017	22,492
	2016	24,055
								2018	257,316
	2017	24,664
								Thereafter	—
	2018	684,556
								Total	348,362
	Thereafter	2,504
								Less: debt discount	(8,525		)
	Total	780,058						Total debt	$	339,837
	Plus: debt premium (discount), net	20,173
								Revolving Lines of Credit
	Total debt	$	800,231					Corporate Revolving Credit Agreement
								On June 29, 2012, the Company and certain of its subsidiaries entered into a five-year, $20.0 million revolving line of credit permitted under the indenture governing the 10.75% Senior Notes with an expiration date of June 30, 2017. The revolver may support up to $2.0 million of letters of credit (which was increased to $10.0 million on January 10, 2014), which would reduce the balance available under the revolver. At December 31, 2013, availability on the revolver was $20.0 million with no outstanding balance and no supported letters of credit. All extensions of credit under the revolver are collateralized by a first priority security interest in and lien upon the inventory and accounts receivable of the Parent, WRI, Kemmerer, and ROVA. Pursuant to the Intercreditor Agreement, the holders of the 10.75% Senior Notes now have a subordinate lien on these assets. The Company capitalized debt issuance costs of $0.7 million in 2012 related to the revolver.
								Two interest rate options exist under this revolver. The Base Rate option bears interest at the greater of the Federal Funds Rate plus 0.5% or the Prime Rate, as defined in the loan agreement and is payable monthly. The LIBOR Rate option bears interest at the London Interbank Offering Rate, or LIBOR, rate plus 2.25% and is payable monthly. In addition, a commitment fee of 0.75% of the average unused portion of the available revolver is payable monthly.
	On February 7, 2014, the Company closed on a private offering of $425.0 million in aggregate principal amount of 10.75% senior notes due 2018 at a price of 106.875% plus accrued interest from February 1, 2014, referred to as the New Notes. Total proceeds of the offering was $454.2 million, which included $29.2 million of debt premium. The net proceeds of the offering of the New Notes will be used to finance the approximately $293 million cash portion of the purchase price of the Sherritt Acquisition, an estimated $58 million to satisfy the cash bonding obligations for the Sherritt mines and cash transaction costs associated with the acquisition and offering of the New Notes of approximately $26 million. The remaining balance of the proceeds will be used to fund the prepayment of the WML Notes and for other general corporate purposes. The proceeds of the offering are being held in escrow pending the completion of the acquisition. The Company will pay interest on the New Notes semi-annually on February 1st and August 1st of each year beginning on August 1, 2014. The Company capitalized debt issuance costs of $7.6 million during the three months ended March 31, 2014.							The loan agreement contains various affirmative, negative and financial covenants. Financial covenants in the agreement include a fixed charge coverage ratio and an EBITDA measure. The fixed charge coverage ratio must meet or exceed a specified minimum. The EBITDA covenant requires a minimum amount of EBITDA to be achieved. We met these covenant requirements as of December 31, 2013.
								WML Revolving Credit Agreement
	Promptly following the completion of the Sherritt Acquisition, the Company will exchange the New Notes for $425 million aggregate principal amount of add-on 10.75% senior secured notes due 2018 (the “Add-On Notes”) and the Company will become party to a registration rights agreement, pursuant to which the Company will agree to register with the Securities and Exchange Commission the exchange of Add-On Notes for registered notes with the same terms as the existing 10.75% Senior Notes due 2018.							At December 31, 2013, WML had a revolving credit agreement with a borrowing limit of $25.0 million and a maturity date of June 26, 2013. WML has two interest rate options to choose from on this revolver. The Base Rate option bears interest at a base rate plus 0.50% and is payable monthly (3.75% per annum at December 31, 2013). The LIBOR Rate option bears interest at the London Interbank Offering Rate, or LIBOR, rate plus 3.0% (3.53% per annum at December 31, 2013). In addition, a commitment fee of 0.50% of the average unused portion of the available revolver is payable quarterly. At December 31, 2013, the revolver had no outstanding balance and supported a $1.9 million letter of credit. The Company had $23.1 million of borrowing availability under this revolver at December 31, 2013.
	If the Sherritt Acquisition is not completed on or prior to June 30, 2014, then the New Notes will be subject to a mandatory redemption at a redemption price equal to 101% of the offering price of the New Notes, plus accrued and unpaid interest through the mandatory redemption date.							In March 2013, the Company amended the credit agreement by extending the maturity date from June 26, 2013 to December 31, 2017. Issuance costs related to the amendment of $0.2 million have been capitalized.
								The revolver is secured by substantially all assets of WML, Westmoreland Savage Corporation, or WSC, Western Energy Company, or WECO, and Dakota Westmoreland Corporation, or DWC; the Company’s membership interest in WML; and the stock of WSC, WECO and DWC. WECO, DWC, and WSC have guaranteed WML’s obligations with respect to the Revolver.
	During the three months ended March 31, 2014, we entered into $12.9 million of new capital leases at our Kemmerer Mine.							Upon closing of the Sherritt Acquisition, the WML revolving credit agreement will expect to be terminated. See Note 1 for additional information.
								10.75% Senior Notes
	Additional information regarding the Company's debt is outlined in Note 5 to the Consolidated Financial Statements in the Company's 2013 Annual Report on Form 10-K.							On February 4, 2011 through a private placement offering, the Company issued $150.0 million of Parent Notes (the “Parent Notes”), which are senior secured notes. The Company’s subsidiary, Westmoreland Partners, was a co-issuer of the notes. The Parent Notes were issued at a 5% discount, mature February 1, 2018, and bear a fixed interest rate of 10.75%, payable semi-annually, in arrears, on February 1 and August 1 of each year, which began August 1, 2011. Proceeds from the Parent Notes were used to retire ROVA's term debt, WRI's term debt and revolving line of credit, and the convertible notes; as well as payment of preferred stock dividend arrearages. On July 29, 2011, the Company commenced an exchange offer for the Parent Notes for an equal principal amount of notes that have been registered under the Securities Act of 1933, which exchange was completed in September, 2011. As a result of this offering, the Company recorded a $17.0 million loss on extinguishment of debt in the year ended December 31, 2011. The loss included a $9.1 million make-whole payment for ROVA’s debt and $7.9 million of non-cash write-offs of unamortized discount on debt and related capitalized debt costs and convertible debt conversion expense.
								On January 31, 2012, the Company completed the private placement of $125.0 million of senior secured notes due in 2018 (the “Add-On Notes”), which were additional notes issued pursuant to the existing Parent Notes indenture, collectively referred to as the “10.75% Senior Notes”. The Add-On Notes were issued at a 4.5% original issue discount. On June 22, 2012, the Company commenced an exchange offer for the Add-On Notes for an equal principal amount of notes that have been registered under the Securities Act of 1933, which exchange was completed in July, 2012. At this time, all of the outstanding 10.75% Senior Notes are traded under one CUSIP. In 2011, the Company capitalized $0.2 million of debt issuance costs related to the Add-On Notes offering and has capitalized debt issuance costs of $4.9 million in 2012. The Company funded the Kemmerer Mine acquisition through the net proceeds from the Add-On Notes.
								The 10.75% Senior Notes mature February 1, 2018, and bear an annual fixed interest rate of 10.75%, payable semi-annually, in arrears, on February 1 and August 1 of each year. The 10.75% Senior Notes are fully and unconditionally guaranteed by ROVA, Westmoreland Kemmerer, Inc. (“Kemmerer”), WRI and their respective subsidiaries (other than Absaloka Coal, LLC) and by certain other subsidiaries. Substantially all of the assets of the Parent, ROVA, Kemmerer and WRI constitute collateral for the 10.75% Senior Notes as to which the holders of these notes have a lien securing the notes. The lien securing the 10.75% Senior Notes is subordinate to the lien securing our revolving credit agreement.
								During the year ended December 31, 2013, the Company paid $0.5 million, excluding accrued interest, to repurchase Senior Notes with a principal amount of $0.5 million. The Company recognized losses of $0.1 million on these repurchases, which were recorded as losses on extinguishment of debt. The losses on the repurchases were measured based on the carrying value of the repurchased portion of the Senior Notes, which included a portion of the unamortized debt issue costs and the debt discount on the dates of repurchase.
								Under the indenture governing the 10.75% Senior Notes, the Company is required to offer a portion of our Excess Cash Flow (as defined by the indenture) for each fiscal year to purchase some of these notes at 100% of the principal amount. While the Company did repurchase $23.0 million of 10.75% Senior Notes during 2012, we did not have Excess Cash Flow for the years ended December 31, 2012 or 2011. The Company did have $29.5 million of Excess Cash Flow for the year ended December 31, 2013 and will be required to offer $22.1 million for repurchase by April 30, 2014. As a result, the Company has reclassified $22.1 million of the outstanding 10.75% Senior Notes to Current installments of long-term debt.
								The indenture governing the 10.75% Senior Notes contains, among other provisions, events of default and various affirmative and negative covenants. As of December 31, 2013, the Company was in compliance with all covenants for these notes.
								WML Term Debt
								The term debt bears interest at 8.02% per annum, payable quarterly. The principal payments required for the term debt are as follows:
									(In millions)
								2014	$	18
								2015	20
								2016	20
								2017	22
							2018	5.5
							Thereafter	—
							The term debt is payable in full on March 31, 2018. The term debt is secured by substantially all assets of WML, Westmoreland Savage Corporation, or WSC, Western Energy Company, or WECO, and Dakota Westmoreland Corporation, or DWC; the Company’s membership interest in WML; and the stock of WSC, WECO and DWC. WECO, DWC, and WSC have guaranteed WML’s obligations with respect to the term debt. The credit agreement requires a debt service account and imposes timing and other restrictions on the ability of WML to distribute funds to the Parent.
							WML’s credit agreement contains various affirmative and negative covenants. Operational covenants in the agreements prohibit, among other things, WML from incurring or guaranteeing additional indebtedness, creating liens on its assets, making investments or engaging in asset sales or transactions with affiliates, in each case subject to specified exceptions. Financial covenants in the agreements impose requirements relating to specified debt service coverage and leverage ratios. The debt service coverage ratio must meet or exceed a specified minimum. The leverage ratio covenant requires that WML not permit the ratio of total debt at the end of each quarter to EBITDA (both as defined) for the four quarters then ended to be greater than a specified amount. WML met all of its covenant requirements as of December 31, 2013.
							Upon closing of the Sherritt Acquisition, the WML term debt will expect to be prepaid using a portion of the $425.0 million in proceeds from the offering of the New Notes. See Note 1 for additional information.
							Capital Leases
							The Company engages in leasing transactions for equipment utilized in its mining operations. At December 31, 2013 and 2012, the capital leases outstanding had a weighted average interest rate of 6.40% and 7.57%, respectively and mature at various dates beginning in 2014 through 2018. During the year ended December 31, 2013, the Company paid $2.7 million to purchase equipment under capital leases prior to their maturities with a principal amount of $2.5 million. The difference between the purchase price and the carrying amount of the capital lease obligation was recorded as an adjustment to the carrying amount of the equipment.

POSTRETIREMENT_MEDICAL_BENEFIT

POSTRETIREMENT MEDICAL BENEFITS	12 Months Ended
	Dec. 31, 2013
Postretirement Medical Benefits Disclosure [Abstract]	'
POSTRETIREMENT MEDICAL BENEFITS	'
	POSTRETIREMENT MEDICAL BENEFITS
	The Company provides postretirement medical benefits to retired employees and their dependents, mandated by the Coal Industry Retiree Health 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. These benefits are provided through self-insured programs.
	The following table sets forth the actuarial present value of postretirement medical benefit obligations and amounts recognized in the Company’s financial statements:
		December 31,
		2013				2012
		(In thousands)
	Change in benefit obligations:
	Net benefit obligation at beginning of year	$	333,842			$	258,641
	Liability acquired	—				49,241
	Service cost	4,436				3,555
	Interest cost	12,139				12,363
	Plan participant contributions	132				129
	Actuarial loss (gain)	(53,230		)		22,342
	Gross benefits paid	(14,220		)		(13,544		)
	Federal subsidy on benefits paid	1,230				1,115
	Net benefit obligation at end of year	284,329				333,842
	Change in plan assets:
	Employer contributions	14,088				13,415
	Plan participant contributions	132				129
	Gross benefits paid	(14,220		)		(13,544		)
	Fair value of plan assets at end of year	—				—
	Unfunded status at end of year	$	(284,329	)		$	(333,842	)
	Amounts recognized in the balance sheet consist of:
	Current liabilities	$	(13,955	)		$	(14,068	)
	Noncurrent liabilities	(270,374		)		(319,775		)
	Accumulated other comprehensive loss	20,292				77,528
	Net amount recognized	$	(264,037	)		$	(256,315	)
	Amounts recognized in accumulated other comprehensive loss consists of:
	Net actuarial loss	$	26,012			$	83,884
	Prior service credit	(5,720		)		(6,356		)
		$	20,292			$	77,528
	In 2013, the Company’s postretirement medical benefit liabilities decreased $49.5 million primarily due to increases in discount rates.
	The Company has elected to amortize its transition obligations over a 20-year period. Prior service costs and credits and actuarial gains and losses are amortized over the average life expectancy or average future service of the plan’s participants. The following amounts will be amortized from accumulated other comprehensive loss into net periodic benefit cost in 2014 (in millions):
	Actuarial loss	$	0.7
	Prior service credit	0.6
	The components of net periodic postretirement medical benefit cost are as follows:
		Years Ended December 31,
		2013				2012			2011
		(In thousands)
	Components of net periodic benefit cost:
	Service cost	$	4,436			$	3,555		$	493
	Interest cost	12,139				12,363			10,510
	Amortization of:
	Transition obligation	—				93			93
	Prior service credit	(636		)		(636		)	(636		)
	Actuarial loss	4,641				3,116			255
	Total net periodic benefit cost	$	20,580			$	18,491		$	10,715
	The following table shows the net periodic postretirement medical benefit costs that relate to current and former mining operations:
		Years Ended December 31,
		2013				2012			2011
		(In thousands)
	Former mining operations	$	12,475			$	11,314		$	9,259
	Current operations	8,105				7,177			1,456
	Total net periodic benefit cost	$	20,580			$	18,491		$	10,715
	The costs for the former mining operations are included in Heritage health benefit expenses and the costs for current operations are included as operating expenses.
	Assumptions
	The weighted-average assumptions used to determine the benefit obligations as of the end of each year were as follows:
		December 31,
		2013		2012
	Discount rate	4.50% - 5.05%		3.60% - 4.15%
	Measurement date	December 31, 2013		December 31, 2012
	The discount rate is adjusted annually based on an Aa corporate bond index adjusted for the difference in the duration of the bond index and the duration of the benefit obligations. This rate is calculated using a yield curve, which is developed using the average yield for bonds in the tenth to ninetieth percentiles, which excludes bonds with outlier yields.
	The weighted-average assumptions used to determine net periodic benefit cost were as follows:
	December 31,
	2013		2012		2011
Discount rate	3.60% - 4.15%		4.10%		5.15%
Measurement date	31-Dec-12		31-Dec-11		31-Dec-10
The following presents information about the assumed health care trend rate:
	December 31,
	2013			2012
Health care cost trend rate assumed for next year	6.75	%		7	%
Rate to which the cost trend is assumed to decline (ultimate trend rate)	5	%		5	%
Year that the trend rate reaches the ultimate trend rate	2021			2021
The effect of a one percent change on the health care cost trend rate used to calculate periodic postretirement medical benefit costs and the related benefit obligation are summarized in the table below:
	Postretirement Medical Benefits
	1 % Increase				1 % Decrease
	(In thousands)
Effect on service and interest cost components	$	3,148			$	(2,442	)
Effect on postretirement medical benefit obligation	$	35,464			$	(30,096	)
Cash Flows
The following benefit payments and Medicare D subsidy (which the Company receives as a benefit partially offsetting its prescription drug costs for retirees and their dependents) are expected by the Company:
	Postretirement				Medicare D			Net
	Medical  Benefits				Subsidy			Postretirement
								Medical Benefits
	(In thousands)
2014	$	13,955			$	(1,249	)	$	12,706
2015	14,522				(1,293		)	13,229
2016	14,975				(1,336		)	13,639
2017	15,408				(1,386		)	14,022
2018	16,191				(1,432		)	14,759
Years 2019 - 2023	85,342				(7,807		)	77,535
Combined Benefit Fund
Additionally, the Company makes payments to the UMWA Combined Benefit Fund, or CBF, which is a multiemployer health plan neither controlled by nor administered by the Company. The CBF is designed to pay health care benefits to UMWA workers (and dependents) who retired prior to 1976. The Company is required by the Coal Act to make monthly premium payments into the CBF. These payments are based on the number of the Company’s UMWA employees who retired prior to 1976, and the Company’s pro-rata assigned share of UMWA retirees whose companies are no longer in business. Contributions to the CBF have decreased over the past three years due to a declining population. The Company expenses payments to the CBF when they are due. The following payments were made to the CBF (in millions):
2013	$	2.2
2012	2.3
2011	2.6
Workers’ Compensation Benefits
The Company was self-insured for workers’ compensation benefits prior to January 1, 1996. Since 1996, the Company has purchased third-party insurance for workers’ compensation claims.
The following table shows the changes in the Company’s workers’ compensation obligation:
	December 31,
	2013				2012
	(In thousands)
Workers’ compensation, beginning of year (including current portion)	$	9,530			$	11,626
Accretion	166				204
Claims paid	(581		)		(475		)
Actuarial changes	(1,654		)		(1,825		)
Workers’ compensation, end of year	7,461				9,530
Less current portion	(717		)		(820		)
Workers’ compensation, less current portion	$	6,744			$	8,710
The discount rates used in determining the workers’ compensation benefit accruals are adjusted annually based on ten-year Treasury bond rates. At December 31, 2013 and 2012, the rates were 3.0% and 2.0%, respectively.
Black Lung Benefits
The Company is self-insured for federal and state black lung benefits for former heritage employees and has established an independent trust to pay these benefits.
The PPACA amended previous legislation related to black lung disease, providing automatic extension of awarded lifetime benefits to surviving spouses and providing changes to the legal criteria used to assess and award claims. Since the legislation passed in March 2010, the Company has experienced a significant increase in claims filed compared to the corresponding period in prior years. However, the Company has not been able to determine what, if any, additional impact may result from these claims due to lack of claims experience under the new legislation and court rulings interpreting the new provisions. The Company has not noted an increase in cash disbursements resulting from these new claims. The Company will continue to evaluate the impact of the PPACA in future periods as additional information, interpretations, guidance and claims experience becomes available.
The following table sets forth the funded status of the Company’s black lung obligation:
	December 31,
	2013				2012
	(In thousands)
Actuarial present value of benefit obligation:
Expected claims from terminated employees	$	876			$	1,139
Amounts owed to existing claimants	13,267				15,061
Total present value of benefit obligation	14,143				16,200
Plan assets at fair value, primarily government-backed securities	5,468				7,844
Excess of the black lung benefit obligation over trust assets	$	8,675			$	8,356
The discount rates used in determining the actuarial present value of the black lung benefit obligation are based on corporate bond yields and are adjusted annually. At December 31, 2013 and 2012, the rates used were 4.00% and 3.25%, respectively.
Plan Assets
The fair value of the Company’s Black Lung trust assets by asset category is as follows:
	31-Dec-13
					Quoted Prices			Significant
					in Active			Other
					Markets for			Observable
					Identical Assets			Inputs
	Fair Value				Level 1			Level 2
	(In thousands)
U.S. treasury securities	$	5,280			$	—		$	5,280
Mortgage-backed securities	185				—			185
Cash and cash equivalents	3				3			—
	$	5,468			$	3		$	5,465
	31-Dec-12
					Quoted Prices			Significant
					in Active			Other
					Markets for			Observable
					Identical Assets			Inputs
	Fair Value				Level 1			Level 2
	(In thousands)
U.S. treasury securities	$	7,548			$	—		$	7,548
Mortgage-backed securities	269				—			269
Cash and cash equivalents	27				27			—
	$	7,844			$	27		$	7,817
The Black Lung Level 1 trust assets include cash and cash equivalents.
The Black Lung Level 2 trust assets include U.S. treasury bonds and notes where evaluators gather information from market sources and integrate relative credit information, observed market movements, and sector news into the evaluated pricing applications and models to value these assets. Level 2 trust assets also include mortgage-backed securities which are valued via model using various inputs such as daily cash flow, snapshots of US Treasury market, floating rate indices as a benchmark yield, spread over index, periodic and life caps, next coupon adjustment date, and convertibility of the bond.

PENSION_AND_OTHER_SAVING_PLANS

PENSION AND OTHER SAVING PLANS	3 Months Ended							12 Months Ended
	Mar. 31, 2014							Dec. 31, 2013
Defined Benefit Pension Plans and Defined Benefit Postretirement Plans Disclosure [Abstract]	'							'
PENSION AND OTHER SAVING PLANS	'							'
	POSTRETIREMENT MEDICAL BENEFITS AND PENSION							PENSION AND OTHER SAVING PLANS
	Postretirement Medical Benefits							Defined Benefit Pension Plans
	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 Company provides defined benefit pension plans to qualified full-time employees pursuant to collective bargaining agreements. Benefits are generally based on years of service and the employee’s average annual compensation for the highest five continuous years of employment as specified in the plan agreement. The Company’s funding policy is to contribute annually the minimum amount prescribed, as specified by applicable regulations or loan covenants. The Company may make additional discretionary contributions. In 2009, the Company froze its pension plan for non-represented employees.
	The components of net periodic postretirement medical benefit cost are as follows:							Supplemental Executive Retirement Plan
								The Company maintains a Supplemental Executive Retirement Plan or SERP for former executives as a result of employment or severance agreements. The SERP is an unfunded non-qualified deferred compensation plan, which provides benefits to certain employees beyond the maximum limits imposed by the Employee Retirement Income Security Act and the Internal Revenue Code. The Company does not expect to add new participants to its SERP plan.
								The following table provides a reconciliation of the changes in the benefit obligations of the plans and the fair value of assets of the qualified plans and the amounts recognized in the Company’s financial statements for both the defined benefit pension and SERP plans:
		Three Months Ended March 31,
		2014			2013
		(In thousands)							Defined Benefit Pension						SERP
	Components of net periodic benefit cost:								December 31,						December 31,
	Service cost	$	822		$	1,109			2013			2012			2013			2012
									(In thousands)
	Interest cost	3,203			3,035			Change in benefit obligation:
								Net benefit obligation at beginning of year	$	172,289		$	100,582		$	4,241		$	4,511
	Amortization of deferred items	5			1,001
								Liability acquired	—			57,307			—			—
	Total net periodic benefit cost	$	4,030		$	5,145
								Service cost	2,346			2,139			—			—
	The following table shows the net periodic postretirement medical benefit costs that relate to current and former mining operations:
								Interest cost	6,209			6,330			152			172
		Three Months Ended March 31,						Actuarial loss (gain)	(18,972		)	13,121			(359		)	(48		)
		2014			2013
		(In thousands)						Benefits and expenses paid	(6,797		)	(7,190		)	(394		)	(394		)
	Former mining operations	$	2,403		$	3,119		Net benefit obligation at end of year	155,075			172,289			3,640			4,241
	Current operations	1,627			2,026			Change in plan assets:
								Fair value of plan assets at the beginning of year	121,887			75,710			—			—
	Total net periodic benefit cost	$	4,030		$	5,145
								Assets acquired	—			41,704			—			—
	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.							Actual return on plan assets	18,414			11,502			—			—
	Pension
								Employer contributions	645			161			394			394
	The Company provides pension benefits to qualified full-time employees pursuant to collective bargaining agreements.
								Benefits and expenses paid	(6,797		)	(7,190		)	(394		)	(394		)
	The Company incurred net periodic benefit costs of providing these pension benefits as follows:							Fair value of plan assets at end of year	134,149			121,887			—			—
								Unfunded status at end of year	$	(20,926	)	$	(50,402	)	$	(3,640	)	$	(4,241	)
		Three Months Ended March 31,						Amounts recognized in the accompanying balance sheet consist of:
		2014			2013			Current liability	$	—		$	—		$	(390	)	$	(390	)
		(In thousands)
	Components of net periodic benefit cost:							Noncurrent liability	(20,926		)	(50,401		)	(3,250		)	(3,850		)
	Service cost	$	500		$	534		Accumulated other comprehensive loss	11,045			43,037			1,209			1,679
	Interest cost	1,747			1,625			Net amount recognized at end of year	$	(9,881	)	$	(7,364	)	$	(2,431	)	$	(2,561	)
								Amounts recognized in accumulated other comprehensive loss consist of:
	Expected return on plan assets	(2,154		)	(2,060		)	Net actuarial loss	$	11,045		$	43,037		$	1,209		$	1,679
	Amortization of deferred items	359			741
									$	11,045		$	43,037		$	1,209		$	1,679
	Total net periodic pension cost	$	452		$	840
								The accumulated benefit obligation for all plans was $158.7 million and $176.5 million at December 31, 2013 and 2012, respectively. The Company’s pension and SERP liabilities decreased $30.1 million in 2013 primarily from increases in discount rates.
	These costs are included in Cost of sales and Selling and administrative expenses.							Prior service costs and actuarial gains and losses are amortized over the expected future period of service of the plan’s participants. The following amounts will be amortized from accumulated other comprehensive loss into net periodic benefit cost in 2014 (in millions):
	The Company contributed $0.6 million of cash contributions to its pension plans in the three months ended March 31, 2014 and expects to make $3.7 million of pension plan contributions during the remainder of 2014.
									Pension			SERP
								Net actuarial loss	$	0.8		$	0.1
								The components of net periodic benefit cost are as follows:
									Defined Benefit Pension									SERP
									Years Ended December 31,									Years Ended December 31,
									2013			2012			2011			2013			2012		2011
									(In thousands)
								Components of net periodic benefit cost:
								Service cost	$	2,346		$	2,139		$	784		$	—		$	—	$	—
								Interest cost	6,209			6,330			4,568			152			172		215
								Expected return on plan assets	(8,770		)	(8,241		)	(5,218		)	—			—		—
								Amortization of:
								Prior service cost	—			—			—			—			—		5
								Actuarial loss	3,377			2,867			1,578			112			95		64
							Total net periodic pension cost	$	3,162		$	3,095		$	1,712		$	264		$	267	$	284
							These costs are included in the accompanying statements of operations in Cost of sales and Selling and administrative expenses.
							Assumptions
							The weighted-average assumptions used to determine the benefit obligations as of the end of each year were as follows:
								Defined Benefit Pension			SERP
								December 31,			December 31,
								2013		2012	2013		2012
							Discount rate	4.25% - 4.65%		3.35% - 3.75%	4.65%		3.75%
							Measurement date	31-Dec-13		December 31, 2012	31-Dec-13		December 31, 2012
							The discount rate is adjusted annually based on an Aa corporate bond index adjusted for the difference in the duration of the bond index and the duration of the benefit obligations. This rate is calculated using a yield curve, which is developed using the average yield for bonds in the tenth to ninetieth percentiles, which excludes bonds with outlier yields.
							The following table provides the assumptions used to determine net periodic benefit cost:
								Defined Benefit Pension					SERP
								Years Ended December 31,					Years Ended December 31,
								2013		2012	2011		2013	2012		2011
							Discount rate	3.35% - 3.75%		4.05% - 4.25%	5.15% - 5.40%		3.75%	4.25%		5.40%
							Expected return on plan assets	7.40%		7.40%	7.40%		N/A	N/A		N/A
							Rate of compensation increase	N/A		N/A	N/A		N/A	N/A		N/A
							Measurement date	31-Dec-12		December 31,	December 31,		31-Dec-12	December 31,		December 31,
										2011	2010			2011		2010
							Plan Assets
							The Company’s investment goals are to maximize returns subject to specific risk management policies. The Company sets the expected return on plan assets based on historical trends and forecasts provided by its third-party fund managers. Its risk management policies permit investments in mutual funds, and prohibit direct investments in debt and equity securities and derivative financial instruments. The Company invested in its common stock in 2011 in order to meet plan funding requirements. The Company addresses diversification by the use of mutual fund investments whose underlying investments are in fixed income and equity securities, both domestic and international. These mutual funds are readily marketable and can be sold to fund benefit payment obligations as they become payable.
							The weighted-average target asset allocation of the Company’s pension trusts were as follows at December 31, 2013:
								Target Allocation
							Asset category
							Cash and equivalents	0% - 10%
							Equity securities funds	20% - 60%
							Debt securities funds	40% - 80%
							Other	0% - 10%
							The fair value of the Company’s pension plan assets by asset category is as follows:
								31-Dec-13
											Quoted			Significant			Significant
											Prices in			Other			Unobservable
											Active			Observable			Inputs
											Markets for			Inputs
											Identical
											Assets
								Fair Value			Level 1			Level 2			Level 3
								(In thousands)
							Pooled separate accounts:
							Large-cap	$	48,983		$	—		$	48,983		$	—
							International blend	18,191			—			18,191			—
							Fixed income domestic	40,944			—			40,944			—
							Fixed income long term	17,797			—			17,797			—
							Stable Value	5,267			—			5,267			—
							Registered investment companies – growth fund	—			—			—			—
							Limited partnerships and limited liability companies	250			—			—			250
							Westmoreland Coal common stock	2,255			2,255			—			—
							Cash and cash equivalents	462			462			—			—
								$	134,149		$	2,717		$	131,182		$	250
								31-Dec-12
											Quoted			Significant			Significant
											Prices in			Other			Unobservable
											Active			Observable			Inputs
											Markets for			Inputs
											Identical
											Assets
								Fair Value			Level 1			Level 2			Level 3
								(In thousands)
							Pooled separate accounts:
							Large-cap	$	50,589		$	—		$	50,589		$	—
							International blend	10,294			—			10,294			—
							Fixed income domestic	42,744			—			42,744			—
							Stable value	3,850			—			3,850			—
							Registered investment companies – growth fund	10,295			10,295			—			—
							Limited partnerships and limited liability companies	614			—			—			614
							Westmoreland Coal common stock	3,500			3,500			—			—
							Cash and cash equivalents	1			1			—			—
								$	121,887		$	13,796		$	107,477		$	614
							The Company’s Level 1 assets include securities held by registered investment companies and its common stock, which are both typically valued using quoted market prices of an active market. Cash and cash equivalents and short-term investments are predominantly held in money market accounts.
							The Company’s Level 2 assets include pooled separate accounts, which are valued based on the quoted market prices of the securities underlying the investments.
							The Company’s Level 3 assets include interest in limited partnerships and limited liability companies that invest in privately held companies or privately held real estate assets. These assets are valued by the respective partnership or company manager using market and income approaches. The market approach consists of using comparable market transactions or values. The income approach consists of the net present value of estimated future cash flows, adjusted as appropriate for liquidity, credit, market and other risk factors. The inputs considered in the valuations include original transaction prices, recent transactions in the same or similar instruments, changes in financial ratios or cash flows, discounted cash flow valuations, and general economic and market conditions.
							A summary of changes in the fair value of the Plan’s Level 3 assets is shown below:
								Limited partnerships and limited
								liability companies
								Year Ended December 31,
								2013			2012
								(In thousands)
							Beginning balance	$	614		$	1,050
							Unrealized gain	5			96
							Settlements, net	(369		)	(532		)
							Ending balance	$	250		$	614
							Contributions
							Previously, the Company was required by WML loan covenants to ensure that by 8.5 months after the end of the plan year, the value of its pension assets are at least 90% of each of the plan’s year end actuarially determined pension liability.  On June 28, 2012, the loan covenant was amended to lower the requirement to 80%.
							The Company contributed $0.6 million in cash to its retirement plans during 2013, in order to achieve the required 80% funding status. In 2014, the Company expects to make approximately $4.3 million of pension plan contributions.
							Cash Flows
							The following benefit payments are expected to be paid from its pension plan assets:
								Pension Benefits
								(In thousands)
							2014	$	7,324
							2015	7,772
							2016	8,238
							2017	9,066
							2018	9,321
							Years 2019 - 2023	50,340
							The benefits expected to be paid are based on the same assumptions used to measure the Company’s pension benefit obligation at December 31, 2013 and include estimated future employee service.
							Multi-Employer Pension
							The Company contributes to the Central Pension Fund, or the Plan, a multiemployer defined benefit pension plan for its WECO, WRI and WSC entities pursuant to collective bargaining agreements. The Plan’s Employer Identification Number is 36-6052390. These employers contribute to the Plan based on a negotiated rate per hour worked per participating employee. For the Plan’s year-end dates of January 31, 2013 and 2012, no single employer contributed more than 5% of total contributions to the Plan. As of the Plan’s year-end date January 31, 2013, it had a healthy or greater than 80% funding status.
							The following table shows required information for each employer contributing to the Central Pension Fund:
								WECO			WRI			WSC
							Employer plan number	9313			9243			4990
							Minimum contributions per hour worked	$	5.75		$	5.7		$2.95 - $3.20
							Expiration date of collective bargaining agreements	2/28/19			5/31/15			4/1/16
							Employer contributions (in millions):
							2013	$	3.4		$	0.9		$	0.1
							2012	3.2			0.5			0.1
							2011	3.2			0.9			0.1
							Other Plans
							The Company sponsors 401(k) saving plans, which were established to assist eligible employees provide for their future retirement needs. The Company’s expense was $3.6 million, $2.9 million and $2.7 million for the years ended December 31, 2013, 2012 and 2011, respectively. During 2013, the Company's expense of $3.6 million consisted of $1.2 million in cash contributions and $2.4 million in contributions of Company stock to the plans. During 2012 and 2011, the Company's expense were all from contributions of Company stock to the plans.

HERITAGE_HEALTH_BENEFIT_EXPENS

HERITAGE HEALTH BENEFIT EXPENSES	3 Months Ended					12 Months Ended
	Mar. 31, 2014					Dec. 31, 2013
Heritage Health Benefit Expenses [Abstract]	'					'
HERITAGE HEALTH BENEFIT EXPENSES	'					'
	HERITAGE HEALTH BENEFIT EXPENSES					HERITAGE HEALTH BENEFIT EXPENSES
	The caption Heritage health benefit expenses used in the consolidated statements of operations refers to costs of benefits the Company provides to its former mining operation employees. The components of these expenses are as follows:					The caption Heritage health benefit expenses used in the consolidated statements of operations refers to costs of benefits the Company provides to its former mining operation employees. The components of these expenses are as follows:
		Three Months Ended March 31,					Years Ended December 31,
		2014		2013			2013			2012			2011
		(In thousands)					(In thousands)
	Health care benefits	$	2,276	$	3,176	Health care benefits	$	12,579		$	11,367		$	9,507
	Combined benefit fund payments	512		576		Combined benefit fund payments	2,240			2,258			2,617
	Workers’ compensation benefits	136		116		Workers’ compensation benefits (credit)	(1,212		)	(1,322		)	2,132
	Black lung benefits	620		83		Black lung benefits (credit)	(189		)	1,085			4,319
	Total	$	3,544	$	3,951	Total	$	13,418		$	13,388		$	18,575

ASSET_RETIREMENT_OBLIGATIONS_C

ASSET RETIREMENT OBLIGATIONS, CONTRACTUAL THIRD-PARTY RECLAMATION RECEIVABLES, AND RECLAMATION DEPOSITS	3 Months Ended									12 Months Ended
	Mar. 31, 2014									Dec. 31, 2013
Asset Retirement Obligation Disclosure [Abstract]	'									'
ASSET RETIREMENT OBLIGATIONS, CONTRACTUAL THIRD-PARTY RECLAMATION RECEIVABLES, AND RECLAMATION DEPOSITS	'									'
	ASSET RETIREMENT OBLIGATIONS, CONTRACTUAL THIRD-PARTY RECLAMATION RECEIVABLE, AND RECLAMATION DEPOSITS									ASSET RETIREMENT OBLIGATIONS, CONTRACTUAL THIRD-PARTY RECLAMATION RECEIVABLE, AND RECLAMATION DEPOSITS
	The asset retirement obligation, contractual third-party reclamation receivable, and reclamation deposits for each of the Company’s mines and ROVA at March 31, 2014 are summarized below:									The asset retirement obligation, contractual third-party reclamation receivable, and reclamation deposits for each of the Company’s mines and ROVA at December 31, 2013 are summarized below:
		Asset			Contractual			Reclamation			Asset			Contractual			Reclamation
		Retirement			Third-Party			Deposits			Retirement			Third-Party			Deposits
		Obligation			Reclamation						Obligation			Reclamation
					Receivable									Receivable
		(In thousands)									(In thousands)
	Rosebud	$	127,989		$	21,656		$	75,315	Rosebud	$	126,965		$	21,186		$	74,921
	Jewett	74,247			74,247			—		Jewett	75,267			75,267			—
	Absaloka	37,286			346			—		Absaloka	36,401			337			—
	Beulah	17,764			—			—		Beulah	17,785			—			—
	Kemmerer	17,569			—			—		Kemmerer	17,174			—			—
	Savage	5,499			—			—		Savage	5,380			—			—
	ROVA	909			—			—		ROVA	892			—			—
	Total	$	281,263		$	96,249		$	75,315	Total	$	279,864		$	96,790		$	74,921
	Asset Retirement Obligations									Asset Retirement Obligations
	Changes in the Company’s asset retirement obligations were as follows:									Changes in the Company’s asset retirement obligations were as follows:
		Three Months Ended March 31,									Years Ended December 31,
		2014			2013						2013			2012
		(In thousands)									(In thousands)
	Asset retirement obligations, beginning of year (including current portion)	$	279,864		$	263,847				Asset retirement obligations, beginning of year (including current portion)	$	263,847		$	247,478
	Accretion	5,836			5,481					Accretion	21,905			21,909
	Liabilities settled	(4,437		)	(5,839		)			Liabilities settled	(21,630		)	(17,342		)
	Asset retirement obligations, end of period	281,263			263,489					Changes due to amount and timing of reclamation	15,742			(7,575		)
	Less current portion	(22,227		)	(23,154		)			ARO acquired	—			19,377
	Asset retirement obligations, less current portion	$	259,036		$	240,335
										Asset retirement obligations, end of year	279,864			263,847
	Contractual Third-Party Reclamation Receivables									Less current portion	(23,353		)	(22,238		)
	At March 31, 2014, the Company has recognized as an asset of $96.2 million as contractual third-party reclamation receivables, representing the present value of customer obligations to reimburse the Company for future reclamation expenditures at the Company’s Rosebud, Jewett and Absaloka Mines.									Asset retirement obligations, less current portion	$	256,511		$	241,609
	Reclamation Deposits
	The Company’s reclamation deposits will be used to fund final reclamation activities. The Company’s carrying value and estimated fair value of its reclamation deposits at March 31, 2014 are as follows:									As permittee, the Company or its subsidiaries are responsible for the total amount of final reclamation costs for its mines and ROVA. The financial responsibility for a portion of final reclamation of the mines when they are closed has been transferred by contract to certain customers, while other customers have provided guarantees or funded escrow accounts to cover final reclamation costs. Costs of reclamation of mining pits prior to mine closure are recovered in the price of coal shipped.
										As of December 31, 2013, the Company had $298.6 million in surety bonds outstanding to secure reclamation obligations.
										Contractual Third-Party Reclamation Receivables
		Carrying Value			Fair Value			Fair Value Hierarchy		The Company has recognized as an asset $96.8 million as contractual third-party reclamation receivables, representing the present value of customer obligations to reimburse the Company for reclamation expenditures at the Company’s Rosebud, Jewett and Absaloka Mines.
		(In thousands)								Reclamation Deposits
	Cash and cash equivalents	$	49,627		$	49,627		Level 1		The Company’s reclamation deposits will be used to fund final reclamation activities. The Company’s carrying value and estimated fair value of its reclamation deposits at December 31, 2013 are as follows:
	Held-to-maturity securities	25,688			26,401			Level 2
											Carrying Value			Fair Value
		$	75,315		$	76,028					(In thousands)
										Cash and cash equivalents	$	63,525		$	63,525
	Held-to-Maturity Reclamation Deposits
	The amortized cost, gross unrealized holding gains and losses and fair value of held-to-maturity securities at March 31, 2014 are as follows (in thousands):									Held-to-maturity securities	11,396			12,086
											$	74,921		$	75,611
	Amortized cost	$	25,688
										In 2011, the Company recorded a gain of $0.1 million on the sale of available-for-sale securities held as reclamation deposits.
	Gross unrealized holding gains	826								Held-to-Maturity and Available-for-Sale Reclamation Deposits
										The amortized cost, gross unrealized holding gains and losses and fair value of held-to-maturity securities are as follows:
	Gross unrealized holding losses	(113		)
	Fair value	$	26,401
											Years Ended December 31,
											2013			2012
	Maturities of held-to-maturity securities are as follows at March 31, 2014:										(In thousands)
										Amortized cost	$	11,396		$	19,832
		Amortized Cost			Fair Value					Gross unrealized holding gains	764			1,190
		(In thousands)
	Within one year	$	479		$	468				Gross unrealized holding losses	(74		)	(9		)
										Fair value	$	12,086		$	21,013
	Due in five years or less	17,562			17,880
										Maturities of held-to-maturity securities are as follows at December 31, 2013:
	Due after five years to ten years	4,869			5,023
	Due in more than ten years	2,778			3,030						Amortized Cost			Fair Value
											(In thousands)
		$	25,688		$	26,401				Within one year	$	17		$	17
									Due in five years or less	6,645			6,976
The Company does not intend to sell its held-to-maturity securities and it is not more likely than not that the Company will be required to sell the securities before recovery of amortized cost bases, which may be at maturity.
									Due after five years to ten years	3,002			3,123
									Due in more than ten years	1,732			1,970
										$	11,396		$	12,086
									The cost basis, gross unrealized holding gains and fair value of available-for-sale securities are as follows:
										December 31,
										2013			2012
										(In thousands)
									Cost basis	$	—		$	1,000
									Gross unrealized holding gains	—			39
									Fair value	$	—		$	1,039

DERIVATIVE_INSTRUMENTS

DERIVATIVE INSTRUMENTS

3 Months Ended

12 Months Ended

Mar. 31, 2014

Dec. 31, 2013

Derivative Instruments and Hedging Activities Disclosure [Abstract]

'

'

DERIVATIVE INSTRUMENTS

'

'

DERIVATIVE INSTRUMENTS

DERIVATIVE INSTRUMENTS

Derivative Assets and Liabilities

Derivative 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 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.

In the first quarter of 2014, the Company entered into two foreign currency exchange forward contracts to purchase Canadian Dollars in order to hedge a portion of its exposure to fluctuating rates of exchange on anticipated Canadian Dollar-denominated Sherritt Acquisition cash flows. As of March 31, 2014, the Company had two individual foreign currency exchange forward contracts with external counterparties for a total notional amount of $348.3 million, which both have settlement dates of April 30, 2014.

Convertible Debt

The fair value of outstanding derivative instruments not designated as hedging instruments on the accompanying Consolidated Balance Sheets was as follows (in thousands):

As a part of the Parent Notes offering in February 2011, the Company’s convertible notes were retired.

The effect of derivative instruments not designated as hedging instruments on the accompanying consolidated statements of operations was as follows (in thousands):

Derivative Instruments

Balance Sheet Location

March 31, 2014

Canadian dollar foreign exchange forward contracts

Other current assets

$

246

Statement of

Income Recognized in

Operations Location

Earnings on Derivatives

Canadian dollar foreign exchange forward contracts

Other current liabilities

(7,036

)

Years Ended December 31,

The effect of derivative instruments not designated as hedging instruments on the accompanying Consolidated Statements of Operations was as follows (in thousands):

Derivative Instrument

2013

2012

2011

Convertible debt -conversion feature

Other income (loss)

$

—

$

—

$

3,079

Derivative Instruments

Statement of

Three Months Ended March 31, 2014

Operations Location

Canadian dollar foreign exchange forward contracts

Loss on foreign exchange

$

(6,790

)

FAIR_VALUE_MEASUREMENTS

FAIR VALUE MEASUREMENTS	3 Months Ended					12 Months Ended
	Mar. 31, 2014					Dec. 31, 2013
Fair Value Disclosures [Abstract]	'					'
FAIR VALUE MEASUREMENTS	'					'
		FAIR VALUE MEASUREMENTS				1	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. See Notes 3, 7 and 8 for additional disclosures related to 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 Company is required to disclose the fair value of financial instruments where practicable. The carrying amounts of cash equivalents, accounts receivable and accounts payable reflected on the consolidated balance sheets approximate the fair value of these instruments due to the short duration to their maturities. 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 as of December 31, 2013 (Level 3).
	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.					The estimated fair value of the Company’s debt with fixed interest rates are as follows:
	•	Level 1, defined as observable inputs such as quoted prices in active markets for identical assets.
							Carrying Value		Fair Value
							(In thousands)
	•	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.				31-Dec-12	$	345,408	$	359,753
						31-Dec-13	$	328,473	$	364,329
	•	Level 3, defined as unobservable inputs in which little or no market data exists, therefore requiring an entity to develop its own assumptions.
	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 as of March 31, 2014 (Level 3). The estimated fair values of the Company’s debt with fixed interest rates are as follows:					The table below sets forth, by level, the Company’s financial assets and liabilities that are accounted for at fair value on a recurring basis:
		Carrying Value		Fair Value			Year Ended December 31, 2012
		(In thousands)					Level 1		Level 2		Level 3		Total
	31-Dec-13	$	328,473	$	364,329		(In thousands)
						Assets:
	March 31, 2014	$	777,670	$	823,603	Available-for-sale investments included in Restricted investments and bond collateral	$	191	$	—	$	—	$	191
	The Company uses derivative financial instruments, primarily foreign exchange contracts, to reduce its exposure to market risks from changes in foreign exchange rates. These foreign exchange contracts are measured at fair value using quoted forward foreign exchange prices from counterparties corroborated by market-based pricing (Level 2). Additional information related to the Company’s derivative financial instruments is disclosed in Note 1 and Note 8 to the consolidated financial statements.					Available-for-sale investments included in Reclamation deposits	1,039		—		—		1,039
	The Company’s non-recurring fair value measurements include asset retirement obligations (refer to Note 7).
	The Company determines the estimated fair value of its asset retirement obligations by calculating the present value of estimated cash flows related to reclamation liabilities using Level 3 inputs. The significant inputs used to calculate such liabilities includes estimates of costs to be incurred, the Company’s credit adjusted discount rate, inflation rates and estimated dates of reclamation. The asset retirement liability is accreted to its present value each period and the capitalized asset retirement cost is depleted using the units-of-production method.					Total assets	$	1,230	$	—	$	—	$	1,230
	The fair value of assets and liabilities acquired through business combinations is calculated using a discounted-cash flow approach using Level 3 inputs. Cash flow estimates require forecasts and assumptions for many years into the future for a variety of factors.

RESTRICTED_STOCK_UNITS_STOCK_O

RESTRICTED STOCK UNITS, STOCK OPTIONS, AND STOCK APPRECIATION RIGHTS (SARs)	3 Months Ended														12 Months Ended
	Mar. 31, 2014														Dec. 31, 2013
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]	'														'
RESTRICTED STOCK UNITS, STOCK OPTIONS, AND STOCK APPRECIATION RIGHTS (SARs)	'														'
	SHARE-BASED COMPENSATION														RESTRICTED STOCK UNITS, STOCK OPTIONS, AND STOCK APPRECIATION RIGHTS (SARs)
															As of December 31, 2013, the Company had restricted stock units, stock options, and stock-settled stock appreciation rights, or SARs, outstanding from three stock incentive plans. Two of these plans were terminated in October 2009. The Company grants employees and non-employee directors restricted stock units from the Amended and Restated 2007 Equity Incentive Stock Plan. The Amended and Restated 2007 Equity Incentive Stock Plan provides that non-employee directors will receive equity awards of 7,000 shares after each annual meeting.
	The Company grants employees and non-employee directors restricted stock units from the Amended and Restated 2007 Equity Incentive Stock Plan.														The maximum number of remaining shares that can be issued under the 2007 Incentive Stock Plan is 49,050.
															Compensation cost arising from share-based arrangements is shown in the following table:
	The Company recognized compensation expense from share-based arrangements shown in the following table:
																Years Ended December 31,
		Three Months Ended March 31,														2013			2012			2011
		2014			2013											(In thousands)
		(In thousands)													Recognition of fair value of restricted stock units, stock options and SARs over vesting period; and issuance of stock	$	2,967		$	3,088		$	1,969
	Recognition of fair value of restricted stock units, stock options and SARs over vesting period; and issuance of stock	$	728		$	1,663
															Contributions of stock to the Company’s 401(k) plan	2,355			2,952			2,752
	Contributions of stock to the Company's 401(k) plan	—			723
															Total share-based compensation expense	$	5,322		$	6,040		$	4,721
	Total share-based compensation expense	$	728		$	2,386
															Restricted Stock Units
															The Company may issue restricted stock units, which requires no payment from the employee. Restricted stock units typically vest ratably over three years. Upon vesting, the Company can elect to settle the restricted stock units in either cash or the Company’s common stock. Compensation expense is based on the fair value on the grant date and is recorded ratably over the vesting period.
	Restricted Stock Units														In April 2013, the Company granted 54,730 restricted stock units, of which 27,366 units will vest ratably over a three-year period. The remaining 27,364 units are performance based, which will vest and pay out at the end of a three-year period if performance goals are met. The Company’s management believes it is probable that the target performance condition will be met.
															A summary of restricted stock award activity for the year ended December 31, 2013 is as follows:
	A summary of restricted stock award activity for the three months ended March 31, 2014 is as follows:
																Units		Weighted Average			Unamortized
		Units		Weighted			Unamortized											Grant-Date Fair			Compensation
				Average			Compensation											Value			Expense
				Grant-Date			Expense														(In thousands)
				Fair Value			(In thousands)								Non-vested at December 31, 2012	680,185		$	8.88
	Non-vested at December 31, 2013	588,727		$	9.37
															Granted	103,730		$	11.7
	Granted	—		—
															Vested	(195,940	)	$	8.62
	Vested	—		—
															Forfeited	—		$	—
	Non-vested at March 31, 2014	588,727		$	9.37		$	1,618		(1)
															Non-vested at December 31, 2013	587,975		$	9.46		$	2,346		(1)
	____________________
															____________________
	-1	Expected to be recognized over the next three years.
	Stock Options														-1	Expected to be recognized over the next three years.
	A summary of stock option activity for the three months ended March 31, 2014 is as follows:														Additional information related to restricted stock units:
		Stock Options		Weighted			Weighted			Aggregate Intrinsic			Unamortized		Years Ended December 31:	Weighted			Total
				Average			Average			Value			Compensation			Average			Grant- Date
				Exercise Price			Remaining			(In thousands)			Expense			Grant-Date			Fair Value of
							Contractual						(In thousands)			Fair Value			Restricted Stock
							Life												Units that Vested
							(In years)												(In thousands)
	Outstanding at December 31, 2013	145,806		$	21.97										2013	$	11.7		$	1,689
	Exercised	—		$	—										2012	$	7.57		$	1,336
	Expired	—		$	—										2011	$	14.99		$	1,757
	Outstanding and exercisable at March 31, 2014	145,806		$	21.97		4			$	1,139		$	—	Stock Options
															Stock options generally vest over three years, expire ten years from the date of grant, and have an option price equal to the market value of the stock on the date of grant.
	There were no stock options granted during the three months ended March 31, 2014.														Information with respect to stock option activity for the year ended December 31, 2013, is as follows:
	SARs
	A summary of SARs activity for the three months ended March 31, 2014 is as follows:
																Stock Options		Weighted			Weighted		Aggregate		Unamortized
																		Average			Average		Intrinsic		Compensation
		SARs		Weighted			Weighted		Aggregate Intrinsic			Unamortized						Exercise Price			Remaining		Value		Expense
				Average Exercise Price			Average		Value			Compensation									Contractual		(In thousands)		(In thousands)
							Remaining		(In thousands)			Expense									Life
							Contractual					(In thousands)									(In years)
							Life								Outstanding at December 31, 2012	170,823		$	21.3
							(In years)
	Outstanding at December 31, 2013	70,734		$	22.6										Expired	(25,017	)	$	17.41
	Exercised	(25,667	)	$	—										Outstanding and exercisable at December 31, 2013	145,806		$	21.97		4.254		$	—	$	—
	Expired	—		$	—										Additional information related to stock options:
	Outstanding and exercisable at March 31, 2014	45,067		$	23.95		1.9		$	352		$	—
Years Ended December 31:															Intrinsic Value of			Total Grant-Date
															Stock Options			Fair Value of Stock
	There were no SARs granted during the three months ended March 31, 2014.														Exercised			Options that Vested
															(In thousands)
														2013	$	—		$	—
														2012	$	—		$	—
														2011	$	86		$	538
														There were no stock options granted during 2013, 2012 or 2011.
														SARs
														SARs generally vest over three years, expire ten years from the date of grant, and have a base price equal to the market value of the stock on the date of grant. Upon vesting, the holders may exercise the SARs and receive a number of shares of common stock having a value equal to the appreciation in the value of the common stock between the grant date and the exercise date.
														Information with respect to SARs granted and outstanding for the year ended December 31, 2013 is as follows:
															SARs		Weighted			Weighted		Aggregate		Unamortized
																	Average Exercise Price			Average		Intrinsic		Compensation
																				Remaining		Value		Expense
																				Contractual		(In thousands)		(In thousands)
																				Life
																				(In years)
														Outstanding at December 31, 2012	70,734		$	22.6
														Expired	—		$	—
														Outstanding and exercisable at December 31, 2013	70,734		$	22.6		1.7		$	—	$	—
														There were no SARs granted or exercised during 2013, 2012, or 2011.
														The total grant-date fair value of SARs that vested was less than $0.1 million in 2011. No SARs vested during 2012 or 2013.

STOCKHOLDERS_EQUITY_AND_ACCUMU

STOCKHOLDERS' EQUITY AND ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS)	3 Months Ended														12 Months Ended
	Mar. 31, 2014														Dec. 31, 2013
Equity [Abstract]	'														'
STOCKHOLDERS' EQUITY AND ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS)	'														'
	SHAREHOLDERS’ EQUITY AND ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS)
															13	STOCKHOLDERS’ EQUITY AND ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS)
	Preferred Stock														Preferred and Common Stock
															The Company has two classes of capital stock outstanding, common stock, par value $2.50 per share, and Series A Convertible Exchangeable Preferred Stock on which cumulative dividends of $2.125 per share are payable quarterly. Each share of Series A Preferred Stock is represented by four Depositary Shares. Under the terms of the Series A Preferred Stock, the Company can redeem preferred shares at any time for the redemption value of $100.00 plus any accumulated dividends paid in cash. In February 2011, the Company paid $19.9 million of accumulated preferred stock dividends as of January 1, 2011. The Company is permitted to pay preferred stock dividends to the extent there is a surplus, defined by Delaware law. In June 2011, approximately 169 shares of preferred stock were converted into 1,152 shares of common stock.  Subsequent to December 31, 2013 and through February 25, 2014, approximately 37,300 shares of preferred stock were converted into 254,822 shares of common stock. The Company paid $1.4 million of preferred stock dividends for the year ended December 31, 2013.
	The Company has outstanding Series A Convertible Exchangeable Preferred Stock on which cumulative dividends of $2.125 per share are payable quarterly. The Company paid $0.3 million of preferred stock dividends for the three months ended March 31, 2014. During the three months ended March 31, 2014, approximately 38,737 shares of preferred stock were converted into 264,641 shares of common stock. Subsequent to March 31, 2014 and through April 23, 2014, approximately 7,830 shares of preferred stock were converted into 53,486 shares of common stock.														Accumulated Other Comprehensive Income (Loss)
															The following is a summary of accumulated other comprehensive income (loss):
	Changes in Accumulated Other Comprehensive Income
	The following table reflects the changes in accumulated other comprehensive loss by component:															Pension and				Available for			Tax Effect of			Accumulated
																Postretirement				Sale			Other			Other
																Medical Benefits				Securities			Comprehensive			Comprehensive
		Pension				Postretirement			Tax effect of			Accumulated											Income Gains			Loss
						medical benefits			other			other				(In thousands)
									comprehensive			comprehensive			Balance at January 1, 2011	$	(32,049	)		$	525		$	(26,156	)	$	(57,680	)
									income gains			loss
		(In thousands)													2011 activity	(63,575		)		(200		)	—			(63,775		)
	Balance at December 31, 2013	$	(12,255	)		$	(20,292	)	$	(31,048	)	$	(63,595	)
	Other comprehensive income (loss) before reclassifications	—				—			(138		)	(138		)	Balance at December 31, 2011	(95,624		)		325			(26,156		)	(121,455		)
	Amounts reclassified from accumulated other comprehensive income (loss)	359				5			—			364			2012 activity	(26,622		)		(268		)	—			(26,890		)
	Balance at March 31, 2014	$	(11,896	)		$	(20,287	)	$	(31,186	)	$	(63,369	)	Balance at December 31, 2012	(122,246		)		57			(26,156		)	(148,345		)
	The following table reflects the reclassifications out of accumulated other comprehensive loss for the three months ended March 31, 2014 are as follows (in thousands):
															2013 activity	89,699				(57		)	(4,892		)	84,750
	Details about accumulated other comprehensive loss components		Amount reclassified from accumulated				Affected line item								Balance at December 31, 2013	$	(32,547	)		$	—		$	(31,048	)	$	(63,595	)
			other comprehensive loss1				in the statement
							where net income
			Three Months Ended March 31, 2014				(loss) is presented								Pension and postretirement medical benefit adjustments relate to changes in the funded status of various benefit plans. The unrealized gains and losses associated with recognizing the Company’s “available-for-sale” securities at fair value are recorded through Accumulated other comprehensive loss.
	Amortization of defined benefit pension items
	Actuarial losses		$	359			2								Changes in Accumulated Other Comprehensive Income
	Amortization of postretirement medical items														The following table reflects the changes in accumulated other comprehensive income (loss) by component:
	Prior service costs		$	(159	)		3
	Actuarial losses		164				3
																Pension				Postretirement			Available for			Tax effect of			Accumulated
			$	5			Total													medical benefits			sale			other			other
																							securities			comprehensive			comprehensive
	____________________																									income gains			loss
																(In thousands)
	-1	Amounts in parentheses indicate debits to income/loss.													Balance at December 31, 2012	$	(44,719	)		$	(77,527	)	$	57		$	(26,156	)	$	(148,345	)
	-2	These accumulated other comprehensive loss components are included in the computation of net periodic pension cost. (See Note 5 - Pension for additional details)													Other comprehensive income before reclassifications	28,974				53,230			(45		)	(4,892		)	77,267
	-3	These accumulated other comprehensive loss components are included in the computation of net periodic postretirement medical cost. (See Note 5 - Postretirement Medical Benefits for additional details)													Amounts reclassified from accumulated other comprehensive income (loss)	3,490				4,005			(12		)	—			7,483
															Balance at December 31, 2013	$	(12,255	)		$	(20,292	)	$	—		$	(31,048	)	$	(63,595	)
															The following table reflects the reclassifications out of accumulated other comprehensive income (loss) for the year ended December 31, 2013 (in thousands):
															Details about accumulated other comprehensive income (loss) components		Amount reclassified from accumulated				Affected line item
																	other comprehensive income (loss)(1)				in the statement
																					where net income
																					(loss) is presented
															Available-for sale securities
															Realized gains and losses on available-for sale securities		$	(12	)		Other income (loss)
																	$	(12	)		Total
															Amortization of defined benefit pension items:
															Actuarial losses		$	3,490			(2)
															Amortization of postretirement medical items:
															Prior service costs		$	(636	)		(3)
															Actuarial losses		4,641				(3)
																	$	4,005			Total
															____________________
															-1	Amounts in parentheses indicate debits to income/loss.
															-2	These accumulated other comprehensive income components are included in the computation of net periodic pension cost. (See Note 7 - Pension and Other Savings Plans for additional details)
															-3	These accumulated other comprehensive income components are included in the computation of net periodic postretirement medical cost. (See Note 6 - Postretirement Medical Benefits for additional details)

INCOME_TAX

INCOME TAX	12 Months Ended
	Dec. 31, 2013
Income Tax Disclosure [Abstract]	'
INCOME TAX	'
	INCOME TAX
	Income tax expense (benefit) attributable to net loss before income taxes consists of:
		Years Ended December 31,
		2013			2012			2011
		(In thousands)
	Current:
	Federal	$	(2	)	$	(8	)	$	(174	)
	State	112			98			168
		110			90			(6		)
	Deferred:
	Federal	(4,189		)	—			—
	State	(703		)	—			(420		)
		(4,892		)	—			(420		)
	Income tax expense (benefit)	$	(4,782	)	$	90		$	(426	)
	Income tax expense (benefit) attributable to net loss before income taxes differed from the amounts computed by applying the statutory Federal income tax rate of 34% to pre-tax income as a result of the following:
		Years Ended December 31,
		2013			2012			2011
		(In thousands)
	Computed tax benefit at statutory rate	$	(4,389	)	$	(4,615	)	$	(12,683	)
	Increase (decrease) in tax expense resulting from:
	Tax depletion in excess of basis	(6,187		)	(4,782		)	(3,820		)
	Non-deductible interest expense	—			—			3,717
	Noncontrolling interest	1,167			2,188			1,283
	State income taxes, net	(2,506		)	(3,427		)	(4,548		)
	Change in valuation allowance for net deferred tax assets	15			8,571			2,923
	Indian Coal Tax Credits	92			83			(122		)
	Federal and state NOL expiration	—			153			11,226
	Change in state effective tax rate	6,202			2,049			1,310
	Other, net	824			(130		)	288
	Income tax expense (benefit)	$	(4,782	)	$	90		$	(426	)
	For the year ended December 31, 2013, the Company recorded a tax benefit of approximately $4.9 million due to non-cash income tax expense related to gains recorded within other comprehensive income during 2013. Generally accepted accounting principles, or GAAP, requires all items be considered, including items recorded in other comprehensive income, in determining the amount of tax benefit that results from a loss from continuing operations that should be allocated to continuing operations. In accordance with GAAP, the Company recorded a tax benefit on its loss from continuing operations, which was exactly offset by income tax expense on other comprehensive income as follows:
		Loss From			Other			Total
		Continuing			Comprehensive			Comprehensive
		Operations			Income			Income
		(In thousands)
	Pre-allocation	$	110		$	—		$	110
	Tax allocation	(4,892		)	4,892			—
	As presented	$	(4,782	)	$	4,892		$	110
	Components of OCI gain:
		Gross			Tax Allocation
	Pension	$	32,464		$	1,772
	Post-retirement benefits	57,235			3,123
	Unrealized gain (loss) on securities	(57		)	(3		)
	Total	$	89,642		$	4,892
	The PPACA reduces the tax benefits available to an employer that receives the Medicare Part D subsidy beginning in years ending after December 31, 2010. As a result of the PPACA, employers that receive the Medicare Part D subsidy will recognize the deferred tax effects of the reduced deductibility of the postretirement prescription drug coverage in the period the PPACA was enacted. On March 30, 2010, a companion bill, the Reconciliation Act, was signed into law. The Reconciliation Act reduces the effect of the PPACA on affected employers by deferring for two years (until years ending after December 31, 2012) the reduced deductibility of the postretirement prescription drug coverage. Accounting for income taxes requires that the effect of adjusting the deferred tax asset for the elimination of this deduction be included in income from continuing operations. However, entities that have a full valuation allowance for this deferred tax asset would recognize a related decrease in the valuation allowance. As the Company has a full valuation allowance against its related deferred tax asset, this change in tax law regarding the Medicare Part D subsidy will not have an effect on the Company’s income from continuing operations.
	On September 13, 2013, the IRS issued T.D. 9636, Guidance Regarding Deduction and Capitalization of Expenditures Related to Tangible Property (the Repairs Regulations) under IRC Sections 162(a) and 263(a) with an effective date of January 1, 2014. These address when costs incurred to acquire, produce or improve tangible property must be capitalized or may be deducted as incurred. Management is currently reviewing and analyzing the final repair Regulations and have estimated the effect to be a reduction in the deferred tax asset of approximately $4.5 million, tax effected. The amount will be confirmed as new data is analyzed and when the companion Regulations governing general asset accounts and the disposition of depreciable property are finalized.
	The tax effects of temporary differences that give rise to significant portions of the deferred tax assets and deferred tax liabilities are presented below:
		December 31,
		2013			2012
		(In thousands)
	Deferred tax assets:
	Federal net operating loss carryforwards	$	89,698		$	84,330
	State net operating loss carryforwards	26,509			28,700
	Alternative minimum tax credit carryforwards	7,179			6,973
	Charitable contribution carryforwards	146			132
	Indian Coal Tax Credit carryforwards	25,499			25,591
	Accruals for the following:
	Workers’ compensation	2,726			3,592
	Postretirement medical benefit and pension obligations	106,912			138,710
	Incentive plans	1,606			1,995
	Asset retirement obligations	68,989			77,698
	Deferred revenues	18,919			22,500
	Excess of pneumoconiosis benefit obligation over trust assets	3,262			3,185
Acquisition Costs	1,276			198
Restructuring	1,909			—
Other accruals	6,656			6,035
Total gross deferred assets	361,286			399,639
Less valuation allowance	(264,464		)	(293,504		)
Net deferred tax assets	96,822			106,135
Deferred tax liabilities:
Property, plant and equipment, differences due to depreciation and amortization	(94,868		)	(104,992		)
Other	(1,954		)	(1,143		)
Total gross deferred tax liabilities	(96,822		)	(106,135		)
Net deferred tax asset	$	—		$	—
As of December 31, 2013, the Company had significant deferred tax assets. The deferred tax assets include federal and state regular net operating losses, or NOLs, alternative minimum tax, or AMT, credit carryforwards, Indian Coal Tax Credit, or ICTC, carryforwards, charitable contribution carryforwards, and net deductible reversing temporary differences related to on-going differences between book and taxable income.
The Company believes it will be taxed under the AMT system for the foreseeable future due to the significant amount of statutory tax depletion in excess of book depletion expected to be generated by its mining operations. As a result, Westmoreland has determined that a valuation allowance is required for all of its regular federal net operating loss carryforwards and AMT credit carryforwards, since they are only available to offset future regular taxes. As of December 31, 2013, the Company has an estimated $7.2 million of AMT credit carryforwards, which have an indefinite carryover life, with no expiration.
As of December 31, 2013, the Company has an estimated $25.5 million in ICTC carryforwards that are available to offset the Company's regular tax and AMT liabilities. The Company has determined that a full valuation allowance is required for all its ICTC carryforward. The ICTC can generally be used to offset AMT liability. The Company does not believe it has sufficient positive evidence of significant magnitude to substantiate that its deferred tax asset for the ICTC carryforward is realizable at a more-likely-than-not level of assurance. As a result, the Company will continue to record a full valuation allowance on its ICTC carryforward; reversing valuation allowance only if utilized in a future year. ICTC credits are a general business credit with a 20-year carryforward period. The majority of the credits will expire in years 2020-2033.
The Company has determined that since its net deductible temporary differences will not reverse for the foreseeable future, and it is unable to forecast that it will have regular taxable income when they do reverse, a full valuation allowance is required for these deferred tax assets.
As of December 31, 2013, the Company has available Federal net operating loss carryforwards to reduce future regular taxable income, which expire as follows:
Expiration Date		Regular Tax
		(In thousands)
2018		$	28
2019		88,429
2020		32
2021		20
after 2022		176,413
Total		$	264,922
As of December 31, 2013, the Company also has an estimated $701 million in state net operating loss carryforwards, expiring in years 2016 through 2033, to reduce future taxable income. The Company has recorded a full valuation allowance for all of its state net operating losses since it believes they will not be realized in the foreseeable future. A portion of our deferred tax assets include NOL benefits that if realized would result in an increase to other paid-in capital.
As of December 31, 2013, Westmoreland had no liability related to uncertain tax positions. The Company has elected under ASC 740-10-40 to recognize interest and penalties related to income tax matters in income tax expense.
The Company files tax returns in the U.S. federal jurisdiction and in various U.S. state jurisdictions, and is subject to examination by taxing authorities in all of these jurisdictions. From time to time, the Company's tax returns are reviewed or audited by various U.S. federal and state taxing authorities. The Company believes that adjustments, if any, resulting from these reviews or audits would not be material, individually or in the aggregate, to the Company's financial position, results of operations or liquidity. It is reasonably possible that the amount of unrecognized tax benefits related to certain of the Company's tax positions will increase or decrease in the next twelve months as audits or reviews are initiated and settled. At this time, an estimate of the range of a reasonably possible change cannot be made. With few exceptions, the Company is not subject to income tax examinations by U.S. federal or state jurisdictions for fiscal years prior to 2010.

COMMITMENTS_AND_CONTINGENCIES

COMMITMENTS AND CONTINGENCIES	3 Months Ended	12 Months Ended
	Mar. 31, 2014	Dec. 31, 2013
Commitments and Contingencies Disclosure [Abstract]	'	'
COMMITMENTS AND CONTINGENCIES	'	'
	CONTINGENCIES	COMMITMENTS AND CONTINGENCIES
		Supply Agreements
	The Company is a party to routine claims and lawsuits with respect to various matters. The Company provides for costs related to contingencies when a loss is probable and the amount is reasonably estimable. After conferring with counsel, it is the opinion of management that the ultimate resolution of pending claims will not have a material adverse effect on the consolidated financial condition, results of operations, or liquidity of the Company.	Westmoreland Partners, which owns ROVA, has two coal supply agreements with TECO Coal Corporation, or TECO, that includes minimum purchase requirements. At the current pricing, Westmoreland Partners is obligated to pay TECO $17.9 million for 2014 and $2.9 million for 2015.
		Leases
		The following shows the gross value and accumulated amortization of property, plant and equipment and mine development assets under capital leases related primarily to the leasing of mining equipment:
			2013			2012
			(In thousands)
		Gross value	$	24,982		$	34,677
		Accumulated amortization	11,983			15,887
		Future minimum capital and operating lease payments as of December 31, 2013, are as follows:
			Capital			Operating
			Leases			Leases
			(In thousands)
		2014	$	5,949		$	7,896
		2015	2,419			5,156
		2016	1,548			2,584
		2017	495			1,256
		2018	316			515
		Thereafter	—			—
		Total minimum lease payments	10,727			$	17,407
		Less imputed interest	(574		)
		Present value of minimum capital lease payments	$	10,153
		Rental expense under operating leases during the years ended December 31, 2013, 2012 and 2011 totaled $11.8 million, $9.5 million and $7.7 million, respectively.
		The Company leases certain of its coal reserves from third parties and pays royalties based on either a per ton rate or as a percentage of revenues received. Royalties charged to expense under all such lease agreements amounted to $43.6 million, $40.1 million and $38.8 million in the years ended December 31, 2013, 2012 and 2011, respectively.
		At December 31, 2013, the Company had fuel supply contracts outstanding with a minimum purchase requirement of 4.0 million gallons of diesel fuel per year. These contracts qualify for the normal purchase normal sale exception under hedge accounting.
		Contingencies
		The Company is a party to numerous claims and lawsuits with respect to various matters. The Company provides for costs related to contingencies when a loss is probable and the amount is reasonably estimable. After conferring with counsel, it is the opinion of management that the ultimate resolution of pending claims will not have a material adverse effect on the consolidated financial condition, results of operations, or liquidity of the Company.

EARNINGS_PER_SHARE

EARNINGS PER SHARE	3 Months Ended
	Mar. 31, 2014
Earnings Per Share [Abstract]	'
EARNINGS PER SHARE	'
	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 convertible notes and securities, 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, 2014 and March 31, 2013 because the Company incurred a net loss applicable to common shareholders in these periods and the effect of inclusion would have been anti-dilutive.
	The table below shows the number of shares that were excluded from the calculation of diluted loss per share because their inclusion would be anti-dilutive to the calculation:
		Three Months Ended March 31,
		2014	2013
		(In thousands)
	Convertible securities	828	1,093
	Restricted stock units, stock options and SARs	779	978
	Total shares excluded from diluted shares calculation	1,607	2,071

BUSINESS_SEGMENT_INFORMATION

BUSINESS SEGMENT INFORMATION	3 Months Ended															12 Months Ended
	Mar. 31, 2014															Dec. 31, 2013
Segment Reporting [Abstract]	'															'
BUSINESS SEGMENT INFORMATION	'															'
	BUSINESS SEGMENT INFORMATION															BUSINESS 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.															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 four reporting segments: coal, power, heritage and corporate.															The Company’s operations are classified into four reporting segments: coal, power, heritage and corporate. The coal reporting segment includes the aggregated operations of coal mines located in Wyoming, Montana, North Dakota and Texas. The power segment includes its ROVA operations located in North Carolina. The heritage segment costs primarily include benefits the Company provides to former mining operation employees as well as other administrative costs associated with providing those benefits and cost containment efforts. The corporate segment primarily consists of corporate administrative expenses.
	Summarized financial information by segment is as follows:															Summarized financial information by segment is as follows:
		Coal			Power			Heritage			Corporate			Consolidated			Coal			Power			Heritage			Corporate			Consolidated
		(In thousands)															(In thousands)
	Three Months Ended March 31, 2014															31-Dec-13
	Revenues	$	158,190		$	22,012		$	—		$	—		$	180,202	Revenues	$	587,119		$	87,567		$	—		$	—		$	674,686
	Restructuring charges	—			397			—			—			397		Restructuring charges	—			5,078			—			—			5,078
	Depreciation, depletion, and amortization	13,459			2,524			—			76			16,059		Operating income (loss)	44,471			4,907			(14,498		)	(9,518		)	25,362
	Operating income (loss)	13,447			1,744			(3,830		)	(3,308		)	8,053		Depreciation, depletion, and amortization	56,698			10,179			—			354			67,231
	Total assets	697,916			167,998			15,622			525,611			1,407,147		Total assets	705,816			180,684			15,497			44,688			946,685
	Capital expenditures	3,053			35			—			(38		)	3,050		Capital expenditures	27,064			790			—			737			28,591
	Three Months Ended March 31, 2013															31-Dec-12
	Revenues	$	142,112		$	19,336		$	—		$	—		$	161,448	Revenues	$	519,152		$	81,285		$	—		$	—		$	600,437
	Depreciation, depletion, and amortization	11,801			2,531			—			94			14,426		Operating income (loss)	48,235			8,244			(14,711		)	(12,896		)	28,872
	Operating income (loss)	13,472			(1,003		)	(4,175		)	(2,560		)	5,734		Depreciation, depletion, and amortization	46,639			10,085			—			421			57,145
	Total assets	711,128			186,309			15,877			29,701			943,015		Total assets	703,315			189,599			15,508			27,693			936,115
	Capital expenditures	5,010			134			—			157			5,301		Capital expenditures	18,804			2,070			—			158			21,032
																31-Dec-11
	A reconciliation of segment income (loss) from operations to loss before income taxes follows:															Revenues	$	414,928		$	86,785		$	—		$	—		$	501,713
																Operating income (loss)	27,453			12,119			(19,675		)	(9,271		)	10,626
		Three Months Ended March 31,
		2014			2013											Depreciation, depletion, and amortization	35,112			10,176			—			306			45,594
		(In thousands)
	Income from operations	$	8,053		$	5,734										Total assets	510,507			194,730			13,769			40,166			759,172
	Interest expense	(20,798		)	(10,160		)									Capital expenditures	24,678			2,119			—			797			27,594
	Interest income	302			297
																A reconciliation of segment income from operations to loss before income taxes follows:
	Loss on foreign exchange	(6,790		)	—
	Other income	93			70												Years Ended
																	2013			2012			2011
	Loss before income taxes	$	(19,140	)	$	(4,059	)										(In thousands)
																Income from operations	$	25,362		$	28,872		$	10,626
																Loss on extinguishment of debt	(64		)	(1,986		)	(17,030		)
																Interest expense	(39,937		)	(42,677		)	(29,769		)
																Interest income	1,366			1,496			1,444
																Other income (loss)	364			723			(2,572		)
																Loss before income taxes	$	(12,909	)	$	(13,572	)	$	(37,301	)
																The Company derives its revenues from a few key customers. The customers from which more than 10% of total revenue has been derived and the percentage of total revenue from those customers is summarized as follows:
																	2013			2012			2011
																	(In thousands)
																Customer A – coal	$	117,545		$	126,982		$	120,243
																Customer B – coal (1)	112,061			96,718			—
																Customer C – coal	89,266			81,981			81,353
																Customer D – power	86,390			80,109			85,639
																Customer E – coal	85,929			66,128			65,224
																Customer F – coal (2)	25,958			26,525			52,835
																Percentage of total revenue	77		%	80		%	81		%
																____________________
																-1	The revenue from Customer B did not exceed 10% in 2011.
																-2	The revenue from Customer F did not exceed 10% in 2013 or 2012.

QUARTERLY_FINANCIAL_DATA_UNAUD

QUARTERLY FINANCIAL DATA (UNAUDITED)	12 Months Ended
	Dec. 31, 2013
Quarterly Financial Information Disclosure [Abstract]	'
QUARTERLY FINANCIAL DATA (UNAUDITED)	'
	QUARTERLY FINANCIAL DATA (UNAUDITED)
	Summarized quarterly financial data is as follows:
		Three Months Ended
		March 31			June 30			September 30		December 31
		(In thousands; except per share data)
	2013:00:00
	Revenues	$	161,448		$	162,499		$	176,792	$	173,947
	Operating income (loss)	5,734			11,975			8,536		(883		)
	Net income (loss) applicable to common shareholders	(2,725		)	(622		)	2,421		(5,131		)
	Basic income (loss) per common share	$	(0.19	)	$	(0.04	)	$	0.17	$	(0.35	)
	2012:00:00
	Revenues	$	147,236		$	132,842		$	161,332	$	159,027
	Operating income (loss)	9,086			(4,262		)	15,451		8,597
	Net income (loss) applicable to common shareholders	518			(12,423		)	7,282		(3,963		)
	Basic income (loss) per common share	$	0.04		$	(0.89	)	$	0.52	$	(0.28	)
	During the second quarter of 2012, the Company revised its preliminary allocation of the Kemmerer Mine purchase price for $2.2 million of deferred revenue. Adjustments to preliminary fair values are assumed to have been made as of the acquisition date. As a result, additional revenue of approximately $1.3 million was subsequently recorded in the first quarter of 2012, compared to what was originally reported in the Form 10-Q for the three months ended March 31, 2012. The information above for the three months ended March 31, 2012 reflects this additional revenue.
	During the fourth quarter of 2013, as a result of a review of useful lives assigned to assets under capital leases and an evaluation of other operating income, the Company recorded $1.5 million of additional net expense related to prior years. In accordance with applicable U.S. GAAP, management quantitatively and qualitatively evaluated the impact and determined it to be immaterial to the Company's 2013 consolidated financial statements.

SUPPLEMENTAL_CONSOLIDATING_FIN

SUPPLEMENTAL CONSOLIDATING FINANCIAL INFORMATION	3 Months Ended																									12 Months Ended
	Mar. 31, 2014																									Dec. 31, 2013
Condensed Financial Information of Parent Company Only Disclosure [Abstract]	'																									'
SUPPLEMENTAL CONSOLIDATING FINANCIAL INFORMATION	'																									'
SUPPLEMENTAL CONSOLIDATING FINANCIAL INFORMATION
Pursuant to the indenture governing the 10.75% Senior Notes, certain 100% owned subsidiaries of the Company have fully and unconditionally guaranteed the notes on a joint and several basis.																									18	SUPPLEMENTAL CONSOLIDATING FINANCIAL INFORMATION
																									Pursuant to the indenture governing the 10.75% Senior Notes, certain 100% owned subsidiaries of the Company have fully and unconditionally guaranteed the notes on a joint and several basis.
Guarantees of the Senior Notes will be released under certain circumstances, including:																									Guarantees of the Senior Notes will be released under certain circumstances, including:
																									-1	in the event of a sale or other disposition of all or substantially all of the assets of such Guarantor Subsidiary, by way of merger, consolidation or otherwise, a sale or other disposition of all of the Equity Interests of such Guarantor Subsidiary then held by the Issuers or any Restricted Subsidiary; provided, that the sale or other disposition does not violate the “Asset Sales” provisions of the Indenture;
-1	in the event of a sale or other disposition of all or substantially all of the assets of such Guarantor Subsidiary, by way of merger, consolidation or otherwise, a sale or other disposition of all of the Equity Interests of such Guarantor Subsidiary then held by the Issuers or any Restricted Subsidiary; provided, that the sale or other disposition does not violate the “Asset Sales” provisions of the Indenture;
																									-2	if such Guarantor Subsidiary is designated as an Unrestricted Subsidiary in accordance with the provisions of the Indenture, upon effectiveness of such designation;
-2	if such Guarantor Subsidiary is designated as an Unrestricted Subsidiary in accordance with the provisions of the Indenture, upon effectiveness of such designation;
																									-3	upon Legal Defeasance or Covenant Defeasance (as such terms are defined in the indenture) or upon satisfaction and discharge of the Indenture;
-3	upon Legal Defeasance or Covenant Defeasance (as such terms are defined in the indenture) or upon satisfaction and discharge of the Indenture;
																									-4	upon the liquidation or dissolution of such Guarantor Subsidiary, provided no event of default has occurred and is continuing; or
-4	upon the liquidation or dissolution of such Guarantor Subsidiary, provided no event of default has occurred and is continuing; or
																									-5	at such time as such Guarantor Subsidiary is no longer required to be a Guarantor Subsidiary of the Senior Notes as described in the Indenture, provided no event of default has occurred and is continuing.
-5	at such time as such Guarantor Subsidiary is no longer required to be a Guarantor Subsidiary of the Senior Notes as described in the Indenture, provided no event of default has occurred and is continuing.																								The following tables present unaudited consolidating financial information for (i) the issuer of the notes (Westmoreland Coal Company), (ii) the co-issuer of the notes (Westmoreland Partners), (iii) the guarantors under the notes, and (iv) the entities that are not guarantors under the notes.
The following tables present unaudited consolidating financial information for (i) the issuer of the notes (Westmoreland Coal Company), (ii) the co-issuer of the notes (Westmoreland Partners), (iii) the guarantors under the notes, and (iv) the entities that are not guarantors under the notes. The following tables are historical and present WML and its subsidiaries as non-guarantor subsidiaries. WML and its subsidiaries became additional guarantor subsidiaries effective on July 31, 2014. The effects of the changes to guarantors that took place on July 31, 2014 are presented below these tables with an explanatory paragraph.																									Certain amounts in prior periods have been reclassified to conform with the presentation of 2013. These reclassifications affected only the statements of cash flows. The following tables are historical and present WML and its subsidiaries as non-guarantor subsidiaries. WML and its subsidiaries became additional guarantor subsidiaries effective on July 31, 2014. The effects of the changes to guarantors that took place on July 31, 2014 are presented below these tables with an explanatory paragraph.
CONSOLIDATING BALANCE SHEETS(1)
March 31, 2014																									CONSOLIDATING BALANCE SHEETS (1)
(In thousands)																									December 31, 2013
																									(In thousands)
Assets		Parent/				Co-Issuer				Guarantor				Non-				Consolidating				Total
		Issuer								Subsidiaries				Guarantor				Adjustments							Assets		Parent/				Co-Issuer				Guarantor				Non-				Consolidating				Total
														Subsidiaries													Issuer								Subsidiaries				Guarantor				Adjustments
Current assets:																																							Subsidiaries
Cash and cash equivalents		$	28,759			$	4,043			$	8,794			$	20,304			$	—			$	61,900		Current assets:
																									Cash and cash equivalents		$	25,326			$	3,341			$	7,942			$	24,501			$	—			$	61,110
Receivables:
Trade		—				12,456				22,857				29,402				—				64,715			Receivables:
																									Trade		—				12,934				17,389				35,873				—				66,196
Contractual third-party reclamation receivables		—				—				44				8,169				—				8,213
																									Contractual third-party reclamation receivables		—				—				44				8,443				—				8,487
Intercompany receivable/payable		(2,263		)		—				3,499				(33,946		)		32,710				—
																									Intercompany receivable/payable		(3,568		)		—				4,384				(33,681		)		32,865				—
Other		273				208				244				681				(31		)		1,375
																									Other		95				210				2,974				1,831				(24		)		5,086
		(1,990		)		12,664				26,644				4,306				32,679				74,303
																											(3,473		)		13,144				24,791				12,466				32,841				79,769
Inventories		—				1,845				15,133				18,469				—				35,447
																									Inventories		—				6,161				16,077				17,735				(1		)		39,972
Restricted investments and bond collateral		16,900				—				—				—				—				16,900
																									Deferred income taxes		—				—				870				—				(870		)		—
Other current assets		7,044				425				3,168				6,005				1				16,643
																									Restricted investments and bond collateral		—				5,998				—				—				—				5,998
Total current assets		50,713				18,977				53,739				49,084				32,680				205,193
																									Other current assets		6,115				143				6,883				5,049				—				18,190
Property, plant and equipment:
Land and mineral rights		—				1,395				104,640				172,163				—				278,198			Total current assets		27,968				28,787				56,563				59,751				31,970				205,039
Plant and equipment		3,966				220,932				245,368				202,923				—				673,189			Property, plant and equipment:
																									Land and mineral rights		—				1,395				104,631				172,163				(1		)		278,188
		3,966				222,327				350,008				375,086				—				951,387
																									Plant and equipment		3,939				220,872				229,998				202,886				1				657,696
Less accumulated depreciation, depletion and amortization		2,781				74,177				138,718				246,079				(1		)		461,754
																											3,939				222,267				334,629				375,049				—				935,884
Net property, plant and equipment		1,185				148,150				211,290				129,007				1				489,633
																									Less accumulated depreciation, depletion and amortization		2,705				71,653				132,189				239,302				(1		)		445,848
Advanced coal royalties		—				—				3,000				4,263				—				7,263
																									Net property, plant and equipment		1,234				150,614				202,440				135,747				1				490,036
Reclamation deposits		—				—				—				75,315				—				75,315
																									Advanced coal royalties		—				—				3,000				4,311				—				7,311
Restricted investments and bond collateral		469,385				—				36,615				17,483				—				523,483
																									Reclamation deposits		—				—				—				74,921				—				74,921
Contractual third-party reclamation receivables		—				—				302				87,734				—				88,036
																									Restricted investments and bond collateral		15,134				—				36,619				17,482				—				69,235
Intangible assets		—				871				—				228				—				1,099
																									Contractual third-party reclamation receivables		—				—				293				88,010				—				88,303
Investment in subsidiaries		237,926				—				—				3,770				(241,696		)		—
																									Intangible assets		—				1,283				—				238				(1		)		1,520
Other assets		15,563				—				569				4,493				(3,500		)		17,125
																									Investment in subsidiaries		266,847				—				—				3,770				(270,617		)		—
Total assets		$	774,772			$	167,998			$	305,515			$	371,377			$	(212,515	)		$	1,407,147
																									Other assets		8,636				—				586				3,098				(2,000		)		10,320
____________________
(1)    This table is presented for historical information and presents WML and its subsidiaries as non-guarantor subsidiaries. WML and its subsidiaries became additional guarantor subsidiaries effective on July 31, 2014.																									Total assets		$	319,819			$	180,684			$	299,501			$	387,328			$	(240,647	)		$	946,685
CONSOLIDATING BALANCE SHEETS(1)																									____________________
March 31, 2014																									(1)    This table is presented for historical information and presents WML and its subsidiaries as non-guarantor subsidiaries. WML and its subsidiaries became additional guarantor subsidiaries effective on July 31, 2014.
(In thousands)																									CONSOLIDATING BALANCE SHEETS (1)
																									December 31, 2013
																									(In thousands)
Liabilities and Shareholders’ Deficit		Parent/				Co-Issuer				Guarantor				Non-				Consolidating				Total
		Issuer								Subsidiaries				Guarantor				Adjustments
														Subsidiaries											Liabilities and Shareholders’ Deficit		Parent/				Co-Issuer				Guarantor				Non-				Consolidating				Total
Current liabilities																											Issuer								Subsidiaries				Guarantor				Adjustments
Current installments of long-term debt		$	22,785			$	—			$	4,596			$	21,205			$	—			$	48,586																Subsidiaries
																									Current liabilities
Accounts payable and accrued expenses:																									Current installments of long-term debt		$	20,392			$	—			$	2,790			$	21,161			$	—			$	44,343
Trade		9,000				6,331				14,710				32,557				—				62,598
																									Accounts payable and accrued expenses:
Production taxes		—				405				22,442				23,947				—				46,794			Trade		4,122				10,119				12,522				30,743				1				57,507
Workers’ compensation		712				—				—				—				—				712			Production taxes		—				3				17,429				24,472				1				41,905
Postretirement medical benefits		12,042				—				329				1,583				1				13,955			Workers’ compensation		717				—				—				—				—				717
SERP		390				—				—				—				—				390			Postretirement medical benefits		12,042				—				329				1,583				1				13,955
Deferred revenue		—				9,581				4,813				1,640				—				16,034			SERP		390				—				—				—				—				390
Asset retirement obligations		—				—				3,554				18,673				—				22,227			Deferred revenue		—				9,024				3,969				1,075				—				14,068
Other current liabilities		19,196				5,053				—				172				(31		)		24,390			Asset retirement obligations		—				—				3,104				20,250				(1		)		23,353
Total current liabilities		64,125				21,370				50,444				99,777				(30		)		235,686			Other current liabilities		11,302				5,053				317				142				(24		)		16,790
Long-term debt, less current installments		677,385				—				12,912				64,848				(3,500		)		751,645			Total current liabilities		48,965				24,199				40,460				99,426				(22		)		213,028
Workers’ compensation, less current portion		6,680				—				—				—				—				6,680			Long-term debt, less current installments		224,582				—				2,664				70,248				(2,000		)		295,494
Excess of black lung benefit obligation over trust assets		9,376				—				—				—				—				9,376			Workers’ compensation, less current portion		6,744				—				—				—				—				6,744
Postretirement medical benefits, less current portion		185,447				—				50,472				35,356				—				271,275			Excess of black lung benefit obligation over trust assets		8,675				—				—				—				—				8,675
Pension and SERP obligations, less current portion		12,921				98				9,494				1,011				—				23,524			Postretirement medical benefits, less current portion		185,858				—				49,418				35,098				—				270,374
Deferred revenue, less current portion		—				38,325				—				4,974				—				43,299			Pension and SERP obligations, less current portion		13,069				99				9,381				1,627				—				24,176
Asset retirement obligations, less current portion		—				909				51,300				206,827				—				259,036			Deferred revenue, less current portion		—				41,297				—				5,271				(1		)		46,567
Intangible liabilities		—				5,339				—				—				—				5,339			Asset retirement obligations, less current portion		—				892				50,472				205,147				—				256,511
Other liabilities		6,440				—				—				1,063				—				7,503			Intangible liabilities		—				5,606				—				—				—				5,606
Intercompany receivable/payable		18,613				—				(4,326		)		5,633				(19,920		)		—			Other liabilities		5,939				—				6,220				1,450				(6,220		)		7,389
Total liabilities		980,987				66,041				170,296				419,489				(23,450		)		1,613,363			Intercompany receivable/payable		13,866				—				525				6,434				(20,825		)		—
Shareholders’ deficit																									Total liabilities		507,698				72,093				159,140				424,701				(29,068		)		1,134,564
Preferred stock		121				—				—				—				—				121
																									Shareholders’ deficit
Common stock		37,155				5				110				132				(247		)		37,155			Preferred stock		160				—				—				—				—				160
Other paid-in capital		134,953				52,842				92,896				66,027				(211,766		)		134,952			Common stock		36,479				5				110				132				(247		)		36,479
Accumulated other comprehensive loss		(63,369		)		(162		)		17,372				(13,937		)		(3,273		)		(63,369		)	Other paid-in capital		134,861				52,835				94,370				64,401				(211,606		)		134,861
Accumulated earnings (deficit)		(315,075		)		49,272				24,841				(100,334		)		26,221				(315,075		)	Accumulated other comprehensive income (loss)		(63,595		)		(164		)		17,492				(14,153		)		(3,175		)		(63,595		)
Total equity (deficit)		(206,215		)		101,957				135,219				(48,112		)		(189,065		)		(206,216		)	Accumulated earnings (deficit)		(295,784		)		55,915				28,389				(87,753		)		3,449				(295,784		)
Total liabilities and shareholders’ deficit		$	774,772			$	167,998			$	305,515			$	371,377			$	(212,515	)		$	1,407,147		Total Westmoreland Coal Company shareholders’ deficit		(187,879		)		108,591				140,361				(37,373		)		(211,579		)		(187,879		)
____________________																									Noncontrolling interest		—				—				—				—				—				—
(1)    This table is presented for historical information and presents WML and its subsidiaries as non-guarantor subsidiaries. WML and its subsidiaries became additional guarantor subsidiaries effective on July 31, 2014.
																									Total equity (deficit)		(187,879		)		108,591				140,361				(37,373		)		(211,579		)		(187,879		)
CONSOLIDATING BALANCE SHEETS(1)
December 31, 2013																									Total liabilities and shareholders’ deficit		$	319,819			$	180,684			$	299,501			$	387,328			$	(240,647	)		$	946,685
(In thousands)
																									____________________
																									(1)    This table is presented for historical information and presents WML and its subsidiaries as non-guarantor subsidiaries. WML and its subsidiaries became additional guarantor subsidiaries effective on July 31, 2014.
Assets		Parent/				Co-Issuer				Guarantor				Non-				Consolidating				Total			CONSOLIDATING BALANCE SHEETS (1)
		Issuer								Subsidiaries				Guarantor				Adjustments							December 31, 2012
														Subsidiaries											(In thousands)
Current assets:
Cash and cash equivalents		$	25,326			$	3,341			$	7,942			$	24,501			$	—			$	61,110
Receivables:																									Assets		Parent/				Co-Issuer				Guarantor				Non-				Consolidating				Total
Trade		—				12,934				17,389				35,873				—				66,196					Issuer								Subsidiaries				Guarantor				Adjustments
																																							Subsidiaries
Contractual third-party reclamation receivables		—				—				44				8,443				—				8,487			Current assets:
																									Cash and cash equivalents		$	14,836			$	4,545			$	5,362			$	6,867			$	—			$	31,610
Intercompany receivable/payable		(3,568		)		—				4,384				(33,681		)		32,865				—
																									Receivables:
Other		95				210				2,974				1,831				(24		)		5,086			Trade		—				13,018				13,428				33,591				—				60,037
		(3,473		)		13,144				24,791				12,466				32,841				79,769			Contractual third-party reclamation receivables		—				—				56				10,151				—				10,207
Inventories		—				6,161				16,077				17,735				(1		)		39,972			Intercompany receivable/payable		(8,002		)		—				5,667				(30,641		)		32,976				—
Deferred income taxes		—				—				870				—				(870		)		—			Other		77				—				16,806				1,182				(14,845		)		3,220
Restricted investments and bond collateral		—				5,998				—				—				—				5,998					(7,925		)		13,018				35,957				14,283				18,131				73,464
Other current assets		6,115				143				6,883				5,049				—				18,190			Inventories		—				3,047				16,538				18,149				—				37,734
Total current assets		27,968				28,787				56,563				59,751				31,970				205,039			Other current assets		739				298				5,550				9,917				—				16,504
Property, plant and equipment:																									Total current assets		7,650				20,908				63,407				49,216				18,131				159,312
Land and mineral rights		—				1,395				104,631				172,163				(1		)		278,188
																									Property, plant and equipment:
Plant and equipment		3,939				220,872				229,998				202,886				1				657,696			Land and mineral rights		—				1,395				91,741				168,605				—				261,741
		3,939				222,267				334,629				375,049				—				935,884			Plant and equipment		3,198				219,857				215,751				196,914				—				635,720
Less accumulated depreciation, depletion and amortization		2,705				71,653				132,189				239,302				(1		)		445,848					3,198				221,252				307,492				365,519				—				897,461
Net property, plant and equipment		1,234				150,614				202,440				135,747				1				490,036			Less accumulated depreciation, depletion and amortization		2,364				61,474				108,151				212,632				—				384,621
Advanced coal royalties		—				—				3,000				4,311				—				7,311			Net property, plant and equipment		834				159,778				199,341				152,887				—				512,840
Reclamation deposits		—				—				—				74,921				—				74,921			Advanced coal royalties		—				—				500				3,816				—				4,316
Restricted investments and bond collateral		15,134				—				36,619				17,482				—				69,235			Reclamation deposits		—				—				—				72,718				—				72,718
Contractual third-party reclamation receivables		—				—				293				88,010				—				88,303			Restricted investments and bond collateral		15,183				5,990				39,208				26,828				—				87,209
Intangible assets		—				1,283				—				238				(1		)		1,520			Contractual third-party reclamation receivables		—				—				327				83,831				—				84,158
Investment in subsidiaries		266,847				—				—				3,770				(270,617		)		—			Intangible assets		—				2,923				—				280				—				3,203
Other assets		8,636				—				586				3,098				(2,000		)		10,320			Investment in subsidiaries		248,565				—				(792		)		3,770				(251,543		)		—
Total assets		$	319,819			$	180,684			$	299,501			$	387,328			$	(240,647	)		$	946,685		Other assets		10,267				—				635				3,457				(2,000		)		12,359
____________________																									Total assets		$	282,499			$	189,599			$	302,626			$	396,803			$	(235,412	)		$	936,115
(1)    This table is presented for historical information and presents WML and its subsidiaries as non-guarantor subsidiaries. WML and its subsidiaries became additional guarantor subsidiaries effective on July 31, 2014.
CONSOLIDATING BALANCE SHEETS(1)																									____________________
December 31, 2013																									(1)    This table is presented for historical information and presents WML and its subsidiaries as non-guarantor subsidiaries. WML and its subsidiaries became additional guarantor subsidiaries effective on July 31, 2014.
(In thousands)
																									CONSOLIDATING BALANCE SHEETS (1)
																									December 31, 2012
																									(In thousands)
Liabilities and Shareholders’ Deficit		Parent/				Co-Issuer				Guarantor				Non-Guarantor				Consolidating				Total
		Issuer								Subsidiaries				Subsidiaries				Adjustments
Current liabilities
Current installments of long-term debt		$	20,392			$	—			$	2,790			$	21,161			$	—			$	44,343		Liabilities and Shareholders’ Deficit		Parent/				Co-Issuer				Guarantor				Non-Guarantor				Consolidating				Total
																											Issuer								Subsidiaries				Subsidiaries				Adjustments
Accounts payable and accrued expenses:																									Current liabilities
Trade		4,122				10,119				12,522				30,743				1				57,507			Current installments of long-term debt		$	(1,548	)		$	—			$	1,939			$	23,400			$	—			$	23,791
Production taxes		—				3				17,429				24,472				1				41,905			Accounts payable and accrued expenses:
																									Trade		4,707				4,978				15,163				42,085				(14,840		)		52,093
Workers’ compensation		717				—				—				—				—				717
																									Production taxes		—				3				10,014				23,211				—				33,228
Postretirement medical benefits		12,042				—				329				1,583				1				13,955
																									Workers’ compensation		820				—				—				—				—				820
SERP		390				—				—				—				—				390
																									Postretirement medical benefits		12,494				—				87				1,487				—				14,068
Deferred revenue		—				9,024				3,969				1,075				—				14,068
																									SERP		390				—				—				—				—				390
Asset retirement obligations		—				—				3,104				20,250				(1		)		23,353
																									Deferred revenue		—				8,788				2,997				1,037				—				12,822
Other current liabilities		11,302				5,053				317				142				(24		)		16,790
																									Asset retirement obligations		—				—				3,519				18,719				—				22,238
Total current liabilities		48,965				24,199				40,460				99,426				(22		)		213,028
																									Other current liabilities		11,312				—				10				144				(4		)		11,462
Long-term debt, less current installments		224,582				—				2,664				70,248				(2,000		)		295,494
																									Total current liabilities		28,175				13,769				33,729				110,083				(14,844		)		170,912
Workers’ compensation, less current portion		6,744				—				—				—				—				6,744
																									Long-term debt, less current installments		245,456				—				2,473				91,269				(2,000		)		337,198
Excess of black lung benefit obligation over trust assets		8,675				—				—				—				—				8,675
																									Workers’ compensation, less current portion		8,710				—				—				—				—				8,710
Postretirement medical benefits, less current portion		185,858				—				49,418				35,098				—				270,374
																									Excess of black lung benefit obligation over trust assets		8,356				—				—				—				—				8,356
Pension and SERP obligations, less current portion		13,069				99				9,381				1,627				—				24,176
																									Postretirement medical benefits, less current portion		224,336				—				55,981				39,458				—				319,775
Deferred revenue, less current portion		—				41,297				—				5,271				(1		)		46,567
																									Pension and SERP obligations, less current portion		29,265				289				19,346				5,350				—				54,250
Asset retirement obligations, less current portion		—				892				50,472				205,147				—				256,511
																									Deferred revenue, less current portion		—				50,239				—				6,652				—				56,891
Intangible liabilities		—				5,606				—				—				—				5,606
																									Asset retirement obligations, less current portion		—				829				40,063				200,717				—				241,609
Other liabilities		5,939				—				6,220				1,450				(6,220		)		7,389
																									Intangible liabilities		—				6,625				—				—				—				6,625
Intercompany receivable/payable		13,866				—				525				6,434				(20,825		)		—
																									Other liabilities		701				—				15,677				1,642				—				18,020
Total liabilities		507,698				72,093				159,140				424,701				(29,068		)		1,134,564
																									Intercompany receivable/payable		23,731				—				(7,972		)		35,787				(51,546		)		—
Shareholders’ deficit
Preferred stock		160				—				—				—				—				160			Total liabilities		568,730				71,751				159,297				490,958				(68,390		)		1,222,346
Common stock		36,479				5				110				132				(247		)		36,479			Shareholders’ deficit
																									Preferred stock		160				—				—				—				—				160
Other paid-in capital		134,861				52,835				94,370				64,401				(211,606		)		134,861
																									Common stock		35,502				5				110				132				(247		)		35,502
Accumulated other comprehensive loss		(63,595		)		(164		)		17,492				(14,153		)		(3,175		)		(63,595		)
																									Other paid-in capital		130,852				52,807				93,456				62,539				(208,802		)		130,852
Accumulated earnings (deficit)		(295,784		)		55,915				28,389				(87,753		)		3,449				(295,784		)
																									Accumulated other comprehensive loss		(148,345		)		(372		)		(4,987		)		(24,492		)		29,851				(148,345		)
Total equity (deficit)		(187,879		)		108,591				140,361				(37,373		)		(211,579		)		(187,879		)
																									Accumulated earnings (deficit)		(289,727		)		65,408				54,750				(132,334		)		12,176				(289,727		)
Total liabilities and shareholders’ deficit		$	319,819			$	180,684			$	299,501			$	387,328			$	(240,647	)		$	946,685
																									Total Westmoreland Coal Company shareholders’ deficit		(271,558		)		117,848				143,329				(94,155		)		(167,022		)		(271,558		)
____________________
(1)    This table is presented for historical information and presents WML and its subsidiaries as non-guarantor subsidiaries. WML and its subsidiaries became additional guarantor subsidiaries effective on July 31, 2014.																									Noncontrolling interest		(14,673		)		—				—				—				—				(14,673		)
CONSOLIDATING STATEMENTS OF OPERATIONS(1)
Three Months Ended March 31, 2014																									Total equity (deficit)		(286,231		)		117,848				143,329				(94,155		)		(167,022		)		(286,231		)
(In thousands)
																									Total liabilities and shareholders’ deficit		$	282,499			$	189,599			$	302,626			$	396,803			$	(235,412	)		$	936,115
																									____________________
	Parent/				Co-Issuer				Guarantor				Non-Guarantor				Consolidating				Total				(1)    This table is presented for historical information and presents WML and its subsidiaries as non-guarantor subsidiaries. WML and its subsidiaries became additional guarantor subsidiaries effective on July 31, 2014.
	Issuer								Subsidiaries				Subsidiaries				Adjustments
Revenues	$	—			$	22,012			$	64,292			$	93,898			$	—			$	180,202			CONSOLIDATING STATEMENTS OF OPERATIONS (1)
																									Year Ended December 31, 2013
Costs and expenses:																									(In thousands)
Cost of sales	—				16,454				50,558				71,618				—				138,630
Depreciation, depletion and amortization	76				2,524				6,269				7,190				—				16,059
																										Parent/				Co-Issuer				Guarantor				Non-Guarantor				Consolidating				Total
Selling and administrative	3,746				894				2,994				5,697				—				13,331					Issuer								Subsidiaries				Subsidiaries				Adjustments
																									Revenues	$	—			$	87,567			$	214,481			$	414,085			$	(41,447	)		$	674,686
Heritage health benefit expenses	3,326				—				—				218				—				3,544
																									Costs and expenses:
Loss (gain) on sales of assets	—				—				(1		)		39				—				38				Cost of sales	—				63,794				174,204				338,769				(41,447		)		535,320
Restructuring charges	—				397				—				—				—				397				Depreciation, depletion and amortization	354				10,178				27,452				29,247				—				67,231
Other operating income	—				—				150				—				—				150				Selling and administrative	12,339				3,609				11,092				23,681				—				50,721
	7,148				20,269				59,970				84,762				—				172,149				Heritage health benefit expenses	12,361				—				—				1,057				—				13,418
Operating income (loss)	(7,148		)		1,743				4,322				9,136				—				8,053				Loss (gain) on sales of assets	—				—				115				(189		)		—				(74		)
Other income (expense):																									Restructuring charges	—				5,078				—				—				—				5,078
Interest expense	(18,673		)		(44		)		(110		)		(1,978		)		7				(20,798		)
																									Other operating income	—				—				(22,367		)		(3		)		—				(22,370		)
Interest income	123				4				25				157				(7		)		302
																										25,054				82,659				190,496				392,562				(41,447		)		649,324
Loss on foreign exchange	(6,790		)		—				—				—				—				(6,790		)
																									Operating income (loss)	(25,054		)		4,908				23,985				21,523				—				25,362
Other income	1				—				55				37				—				93
																									Other income (expense):
	(25,339		)		(40		)		(30		)		(1,784		)		—				(27,193		)		Interest expense	(30,417		)		(39		)		(295		)		(9,221		)		35				(39,937		)
Income (loss) before income taxes and income of consolidated subsidiaries	(32,487		)		1,703				4,292				7,352				—				(19,140		)		Loss on extinguishment of debt	(64		)		—				—				—				—				(64		)
Equity in income of subsidiaries	13,319				—				—				—				(13,319		)		—				Interest income	165				26				522				688				(35		)		1,366
Income (loss) before income taxes	(19,168		)		1,703				4,292				7,352				(13,319		)		(19,140		)		Other income	1				—				328				35				—				364
Income tax expense (benefit)	(138		)		—				(1,511		)		6,626				(5,087		)		(110		)			(30,315		)		(13		)		555				(8,498		)		—				(38,271		)
Net income (loss)	(19,030		)		1,703				5,803				726				(8,232		)		(19,030		)		Income (loss) before income taxes and income of consolidated subsidiaries	(55,369		)		4,895				24,540				13,025				—				(12,909		)
Less net loss attributable to noncontrolling interest	—				—				—				—				—				—				Equity in income of subsidiaries	42,347				—				—				—				(42,347		)		—
Net income (loss) attributable to the Parent company	$	(19,030	)		$	1,703			$	5,803			$	726			$	(8,232	)		$	(19,030	)		Loss before income taxes	(13,022		)		4,895				24,540				13,025				(42,347		)		(12,909		)
____________________																									Income tax expense (benefit)	(4,895		)		680				8,461				(47		)		(8,981		)		(4,782		)
(1)    This table is presented for historical information and presents WML and its subsidiaries as non-guarantor subsidiaries. WML and its subsidiaries became additional guarantor subsidiaries effective on July 31, 2014.
																									Net income (loss)	(8,127		)		4,215				16,079				13,072				(33,366		)		(8,127		)
CONSOLIDATING STATEMENTS OF OPERATIONS(1)
Three Months Ended March 31, 2013																									Less net loss attributable to noncontrolling interest	(3,430		)		—				—				—				—				(3,430		)
(In thousands)
																									Net income (loss) attributable to the Parent company	$	(4,697	)		$	4,215			$	16,079			$	13,072			$	(33,366	)		$	(4,697	)
																									____________________
	Parent/				Co-Issuer				Guarantor				Non-Guarantor				Consolidating				Total				(1)    This table is presented for historical information and presents WML and its subsidiaries as non-guarantor subsidiaries. WML and its subsidiaries became additional guarantor subsidiaries effective on July 31, 2014.
	Issuer								Subsidiaries				Subsidiaries				Adjustments
Revenues	$	—			$	19,336			$	50,687			$	100,401			$	(8,976	)		$	161,448			CONSOLIDATING STATEMENTS OF OPERATIONS (1)
																									Year Ended December 31, 2012
Costs and expenses:																									(In thousands)
Cost of sales	—				16,954				40,421				82,022				(8,976		)		130,421
Depreciation, depletion and amortization	94				2,531				5,189				6,612				—				14,426
																										Parent/				Co-Issuer				Guarantor				Non-Guarantor				Consolidating				Total
Selling and administrative	3,054				855				2,637				5,341				—				11,887					Issuer								Subsidiaries				Subsidiaries				Adjustments
																									Revenues	$	—			$	81,285			$	184,506			$	366,105			$	(31,459	)		$	600,437
Heritage health benefit expenses	3,689				—				—				262				—				3,951
																									Costs and expenses:
Gain on sales of assets	—				—				(133		)		(101		)		—				(234		)		Cost of sales	—				59,299				134,683				303,998				(31,459		)		466,521
Other operating income	—				—				(4,737		)		—				—				(4,737		)		Depreciation, depletion and amortization	421				10,085				19,571				27,068				—				57,145
	6,837				20,340				43,377				94,136				(8,976		)		155,714				Selling and administrative	13,748				3,657				9,993				24,037				(1,527		)		49,908
Operating income (loss)	(6,837		)		(1,004		)		7,310				6,265				—				5,734				Heritage health benefit expenses	12,406				—				—				982				—				13,388
Other income (expense):																									Loss on sales of assets	13				—				251				264				—				528
Interest expense	(7,584		)		(10		)		(74		)		(2,500		)		8				(10,160		)
																									Other operating income	—				—				(17,452		)		—				1,527				(15,925		)
Interest income	30				10				44				221				(8		)		297
																										26,588				73,041				147,046				356,349				(31,459		)		571,565
Other income (loss)	—				—				92				(22		)		—				70
																									Operating income (loss)	(26,588		)		8,244				37,460				9,756				—				28,872
	(7,554		)		—				62				(2,301		)		—				(9,793		)
																									Other income (expense):
Income (loss) before income taxes and income of consolidated subsidiaries	(14,391		)		(1,004		)		7,372				3,964				—				(4,059		)		Interest expense	(31,301		)		(39		)		(378		)		(11,039		)		80				(42,677		)
Equity in income of subsidiaries	10,304				—				—				—				(10,304		)		—				Loss on extinguishment of debt	(1,986		)		—				—				—				—				(1,986		)
Income (loss) before income taxes	(4,087		)		(1,004		)		7,372				3,964				(10,304		)		(4,059		)		Interest income	253				15				294				1,014				(80		)		1,496
Income tax expense (benefit)	—				—				496				2,823				(3,291		)		28				Other income	190				—				395				138				—				723
Net income (loss)	(4,087		)		(1,004		)		6,876				1,141				(7,013		)		(4,087		)			(32,844		)		(24		)		311				(9,887		)		—				(42,444		)
Less net loss attributable to noncontrolling interest	(1,702		)		—				—				—				—				(1,702		)		Income (loss) before income taxes and income of consolidated subsidiaries	(59,432		)		8,220				37,771				(131		)		—				(13,572		)
Net income (loss) attributable to the Parent company	$	(2,385	)		$	(1,004	)		$	6,876			$	1,141			$	(7,013	)		$	(2,385	)		Equity in income of subsidiaries	45,762				—				—				—				(45,762		)		—
____________________																									Income (loss) before income taxes	(13,670		)		8,220				37,771				(131		)		(45,762		)		(13,572		)
(1)    This table is presented for historical information and presents WML and its subsidiaries as non-guarantor subsidiaries. WML and its subsidiaries became additional guarantor subsidiaries effective on July 31, 2014.
																									Income tax expense (benefit)	(8		)		107				—				4,410				(4,419		)		90
CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS)(1)
Three Months Ended March 31, 2014																									Net income (loss)	(13,662		)		8,113				37,771				(4,541		)		(41,343		)		(13,662		)
(In thousands)
																									Less net loss attributable to noncontrolling interest	(6,436		)		—				—				—				—				(6,436		)
	Parent/Issuer				Co-Issuer				Guarantor				Non-Guarantor				Consolidating				Total				Net income (loss) attributable to the Parent company	$	(7,226	)		$	8,113			$	37,771			$	(4,541	)		$	(41,343	)		$	(7,226	)
									Subsidiaries				Subsidiaries				Adjustments
Net income (loss)	$	(19,030	)		$	1,703			$	5,803			$	726			$	(8,232	)		$	(19,030	)		____________________
																									(1)    This table is presented for historical information and presents WML and its subsidiaries as non-guarantor subsidiaries. WML and its subsidiaries became additional guarantor subsidiaries effective on July 31, 2014.
Other comprehensive income (loss)
Amortization of accumulated actuarial gains or losses, pension	359				2				—				128				(130		)		359				CONSOLIDATING STATEMENTS OF OPERATIONS (1)
																									Year Ended December 31, 2011
Amortization of accumulated actuarial gains or losses, transition obligations, and prior service costs, postretirement medical benefit	5				—				(119		)		88				31				5				(In thousands)
Tax effect of other comprehensive income gains	(138		)		—				—				—				—				(138		)
Other comprehensive income (loss)	226				2				(119		)		216				(99		)		226					Parent/				Co-Issuer				Guarantor				Non-Guarantor				Consolidating				Total
																										Issuer								Subsidiaries				Subsidiaries				Adjustments
Comprehensive income (loss) attributable to the Parent company	$	(18,804	)		$	1,705			$	5,684			$	942			$	(8,331	)		$	(18,804	)		Revenues	$	—			$	86,785			$	58,544			$	411,908			$	(55,524	)		$	501,713
____________________																									Costs and expenses:
(1)    This table is presented for historical information and presents WML and its subsidiaries as non-guarantor subsidiaries. WML and its subsidiaries became additional guarantor subsidiaries effective on July 31, 2014.																									Cost of sales	—				60,243				49,439				338,629				(55,524		)		392,787
CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS)(1)																									Depreciation, depletion and amortization	306				10,175				7,936				27,177				—				45,594
Three Months Ended March 31, 2013
(In thousands)																									Selling and administrative	10,616				4,059				4,566				21,508				(473		)		40,276
																									Heritage health benefit expenses	17,754				—				—				821				—				18,575
	Parent/Issuer				Co-Issuer				Guarantor				Non-Guarantor				Consolidating				Total
									Subsidiaries				Subsidiaries				Adjustments								Gain (loss) on sales of assets	3				189				59				389				—				640
Net income (loss)	$	(4,087	)		$	(1,004	)		$	6,876			$	1,141			$	(7,013	)		$	(4,087	)
																									Other operating income	—				—				(7,258		)		—				473				(6,785		)
Other comprehensive income (loss)
Amortization of accumulated actuarial gains or losses, pension	741				6				—				193				(199		)		741					28,679				74,666				54,742				388,524				(55,524		)		491,087
Amortization of accumulated actuarial gains or losses, transition obligations, and prior service costs, postretirement medical benefit	1,001				—				—				213				(213		)		1,001				Operating income (loss)	(28,679		)		12,119				3,802				23,384				—				10,626
Other comprehensive income (loss)	1,742				6				—				406				(412		)		1,742				Other income (expense):
																									Interest expense	(16,365		)		(469		)		(657		)		(12,370		)		92				(29,769		)
Comprehensive income (loss) attributable to the Parent company	$	(2,345	)		$	(998	)		$	6,876			$	1,547			$	(7,425	)		$	(2,345	)
																									Loss on extinguishment of debt	(7,873		)		(9,073		)		(84		)		—				—				(17,030		)
____________________
(1)    This table is presented for historical information and presents WML and its subsidiaries as non-guarantor subsidiaries. WML and its subsidiaries became additional guarantor subsidiaries effective on July 31, 2014.																									Interest income	266				14				206				1,050				(92		)		1,444
CONSOLIDATING STATEMENTS OF CASH FLOWS(1)																									Other income (loss)	(3,014		)		—				170				272				—				(2,572		)
Three Months Ended March 31, 2014
(In thousands)																										(26,986		)		(9,528		)		(365		)		(11,048		)		—				(47,927		)
																									Loss before income taxes and income of consolidated subsidiaries	(55,665		)		2,591				3,437				12,336				—				(37,301		)
Statements of Cash Flows		Parent/				Co-Issuer				Guarantor				Non-Guarantor				Consolidating				Total			Equity in income of subsidiaries	18,508				—				—				—				(18,508		)		—
		Issuer								Subsidiaries				Subsidiaries				Adjustments
Cash flows from operating activities:																									Loss before income taxes	(37,157		)		2,591				3,437				12,336				(18,508		)		(37,301		)
Net income (loss)		$	(19,030	)		$	1,703			$	5,803			$	726			$	(8,232	)		$	(19,030	)
																									Income tax expense (benefit)	(282		)		(2,498		)		(26		)		7,263				(4,883		)		(426		)
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Equity in income of subsidiaries		(13,319		)		—				—				—				13,319				—			Net income (loss)	(36,875		)		5,089				3,463				5,073				(13,625		)		(36,875		)
Depreciation, depletion, and amortization		76				2,524				6,269				7,190				—				16,059			Less net loss attributable to noncontrolling interest	(3,775		)		—				—				—				—				(3,775		)
Accretion of asset retirement obligation and receivable		—				18				1,278				2,183				—				3,479			Net loss attributable to the Parent company	$	(33,100	)		$	5,089			$	3,463			$	5,073			$	(13,625	)		$	(33,100	)
Non-cash tax benefits		(138		)		—				—				—				—				(138		)	____________________
																									(1)    This table is presented for historical information and presents WML and its subsidiaries as non-guarantor subsidiaries. WML and its subsidiaries became additional guarantor subsidiaries effective on July 31, 2014.
Amortization of intangible assets and liabilities, net		—				146				—				7				—				153
																									CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) (1)
Share-based compensation		569				7				37				115				—				728			Year Ended December 31, 2013
																									(In thousands)
Loss (gain) on sales of assets		—				—				(1		)		39				—				38
Amortization of deferred financing costs		149				—				—				122				—				271				Parent/Issuer				Co-Issuer				Guarantor				Non-Guarantor				Consolidating				Total
																																		Subsidiaries				Subsidiaries				Adjustments
Loss on foreign exchange		6,790				—				—				—				—				6,790
																									Net income (loss)	$	(8,127	)		$	4,215			$	16,079			$	13,072			$	(33,366	)		$	(8,127	)
Changes in operating assets and liabilities:
Receivables, net		(178		)		480				(2,738		)		6,104				1,534				5,202			Other comprehensive income (loss)
																									Amortization of accumulated actuarial gains or losses, pension	3,490				28				—				863				(891		)		3,490
Inventories		—				4,316				944				(735		)		—				4,525
																									Adjustments to accumulated actuarial losses and transition obligations, pension	28,974				180				10,554				3,252				(13,986		)		28,974
Excess of black lung benefit obligation over trust assets		701				—				—				—				—				701
																									Amortization of accumulated actuarial gains or losses, transition obligations, and prior service costs, postretirement medical benefit	4,005				—				—				852				(852		)		4,005
Accounts payable and accrued expenses		5,670				(3,386		)		7,356				1,327				(8		)		10,959
																									Adjustments to accumulated actuarial gains and transition obligations, postretirement medical benefits	53,230				—				11,941				5,411				(17,352		)		53,230
Deferred revenue		—				(2,415		)		844				269				—				(1,302		)
																									Tax effect of other comprehensive income gains	(4,892		)		—				—				—				—				(4,892		)
Income tax payable		—				—				—				28				—				28
																									Unrealized and realized gains and losses on available-for-sale securities	(57		)		—				(17		)		(38		)		55				(57		)
Accrual for workers’ compensation		(69		)		—				—				—				—				(69		)
																									Other comprehensive income	84,750				208				22,478				10,340				(33,026		)		84,750
Asset retirement obligations		—				—				(9		)		(1,343		)		—				(1,352		)
																									Comprehensive income attributable to Westmoreland Coal Company	$	76,623			$	4,423			$	38,557			$	23,412			$	(66,392	)		$	76,623
Accrual for postretirement medical benefits		(374		)		—				935				345				—				906
																									____________________
Pension and SERP obligations		83				1				113				(490		)		—				(293		)	(1)    This table is presented for historical information and presents WML and its subsidiaries as non-guarantor subsidiaries. WML and its subsidiaries became additional guarantor subsidiaries effective on July 31, 2014.
Other assets and liabilities		(183		)		(309		)		(1,616		)		(2,880		)		6,981				1,993
Distributions received from subsidiaries		42,500				—				—				—				(42,500		)		—
																									CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) (1)
Net cash provided by (used in) operating activities		23,247				3,085				19,215				13,007				(28,906		)		29,648			Year Ended December 31, 2012
																									(In thousands)
Cash flows from investing activities:
Additions to property, plant and equipment		38				(35		)		(2,609		)		(444		)		—				(3,050		)
Change in restricted investments and bond collateral and reclamation deposits		(471,151		)		5,998				4				(395		)		—				(465,544		)		Parent/Issuer				Co-Issuer				Guarantor				Non-Guarantor				Consolidating				Total
																																		Subsidiaries				Subsidiaries				Adjustments
																									Net income (loss)	$	(13,662	)		$	8,113			$	37,771			$	(4,541	)		$	(41,343	)		$	(13,662	)
Receivable from customer for property and equipment purchases		—				—				—				(10		)		—				(10		)
																									Other comprehensive income (loss)
Other		—				—				—				(60		)		—				(60		)	Amortization of accumulated actuarial gains or losses, pension	2,960				23				—				766				(789		)		2,960
Net cash provided by (used in) investing activities		(471,113		)		5,963				(2,605		)		(909		)		—				(468,664		)	Adjustments to accumulated actuarial losses and transition obligations, pension	(9,812		)		(52		)		(3,034		)		(2,132		)		5,218				(9,812		)
Cash flows from financing activities:																									Amortization of accumulated actuarial gains or losses, transition obligations, and prior service costs, postretirement medical benefit	2,572				—				—				973				(973		)		2,572
Change in book overdrafts		—				—				(317		)		2				—				(315		)
																									Adjustments to accumulated actuarial gains and transition obligations, postretirement medical benefits	(22,342		)		—				(1,969		)		(865		)		2,834				(22,342		)
Borrowings from long-term debt		454,219				—				—				—				—				454,219
																									Unrealized and realized gains and losses on available-for-sale securities	(268		)		—				1				(65		)		64				(268		)
Repayments of long-term debt		—				—				(875		)		(5,364		)		—				(6,239		)
																									Other comprehensive income	(26,890		)		(29		)		(5,002		)		(1,323		)		6,354				(26,890		)
Debt issuance costs and other refinancing costs		(7,598		)		—				—				—				—				(7,598		)
																									Comprehensive income (loss) attributable to Westmoreland Coal Company	$	(40,552	)		$	8,084			$	32,769			$	(5,864	)		$	(34,989	)		$	(40,552	)
Dividends/distributions		(261		)		(8,500		)		(18,000		)		(16,000		)		42,500				(261		)
																									____________________
Transactions with Parent/affiliates		4,939				154				3,434				5,067				(13,594		)		—			(1)    This table is presented for historical information and presents WML and its subsidiaries as non-guarantor subsidiaries. WML and its subsidiaries became additional guarantor subsidiaries effective on July 31, 2014.
Net cash provided by (used in) financing activities		451,299				(8,346		)		(15,758		)		(16,295		)		28,906				439,806
Net increase (decrease) in cash and cash equivalents		3,433				702				852				(4,197		)		—				790			CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) (1)
																									Year Ended December 31, 2011
Cash and cash equivalents, beginning of period		25,326				3,341				7,942				24,501				—				61,110			(In thousands)
Cash and cash equivalents, end of period		$	28,759			$	4,043			$	8,794			$	20,304			$	—			$	61,900
____________________																										Parent/Issuer				Co-Issuer				Guarantor				Non-Guarantor				Consolidating				Total
(1)    This table is presented for historical information and presents WML and its subsidiaries as non-guarantor subsidiaries. WML and its subsidiaries became additional guarantor subsidiaries effective on July 31, 2014.																																		Subsidiaries				Subsidiaries				Adjustments
CONSOLIDATING STATEMENTS OF CASH FLOWS(1)																									Net income (loss)	$	(36,875	)		$	5,089			$	3,463			$	5,073			$	(13,625	)		$	(36,875	)
Three Months Ended March 31, 2013
(In thousands)																									Other comprehensive income (loss)
																									Amortization of accumulated actuarial gains or losses, pension	1,647				9				—				702				(711		)		1,647
																									Adjustments to accumulated actuarial losses and transition obligations, pension	(15,798		)		(150		)		—				(444		)		594				(15,798		)
Statements of Cash Flows		Parent/				Co-Issuer				Guarantor				Non-Guarantor				Consolidating				Total
		Issuer								Subsidiaries				Subsidiaries				Adjustments							Amortization of accumulated actuarial gains or losses, transition obligations, and prior service costs, postretirement medical benefit	(288		)		—				—				295				(295		)		(288		)
Cash flows from operating activities:
Net income (loss)		$	(4,087	)		$	(1,004	)		$	6,876			$	1,141			$	(7,013	)		$	(4,087	)	Adjustments to accumulated actuarial gains and transition obligations, postretirement medical benefits	(49,136		)		—				—				(9,269		)		9,269				(49,136		)
Adjustments to reconcile net income (loss) to net cash provided by operating activities:																									Unrealized and realized gains and losses on available-for-sale securities	(200		)		—				(103		)		(100		)		203				(200		)
Equity in income of subsidiaries		(10,304		)		—				—				—				10,304				—
																									Other comprehensive income	(63,775		)		(141		)		(103		)		(8,816		)		9,060				(63,775		)
Depreciation, depletion, and amortization		94				2,531				5,189				6,612				—				14,426
																									Comprehensive income (loss) attributable to Westmoreland Coal Company	$	(100,650	)		$	4,948			$	3,360			$	(3,743	)		$	(4,565	)		$	(100,650	)
Accretion of asset retirement obligation and receivable		—				16				1,050				2,114				—				3,180
																									____________________
Amortization of intangible assets and liabilities, net		—				156				—				8				—				164			(1)    This table is presented for historical information and presents WML and its subsidiaries as non-guarantor subsidiaries. WML and its subsidiaries became additional guarantor subsidiaries effective on July 31, 2014.
Share-based compensation		682				10				681				1,013				—				2,386
																									CONSOLIDATING STATEMENTS OF CASH FLOWS (1)
Gain on sales of assets		—				—				(133		)		(101		)		—				(234		)	Year Ended December 31, 2013
																									(In thousands)
Amortization of deferred financing costs		771				—				13				149				—				933
Loss on sales of investment securities		—				—				7				—				—				7
																									Statements of Cash Flows		Parent/				Co-Issuer				Guarantor				Non-Guarantor				Consolidating				Total
Changes in operating assets and liabilities:																											Issuer								Subsidiaries				Subsidiaries				Adjustments
Receivables, net		49				2,885				(2,467		)		(3,355		)		3,008				120			Cash flows from operating activities:
																									Net income (loss)		$	(8,127	)		$	4,215			$	16,079			$	13,072			$	(33,366	)		$	(8,127	)
Inventories		—				(2,181		)		(753		)		247				—				(2,687		)
																									Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Excess of black lung benefit obligation over trust assets		83				—				—				—				—				83			Equity in income of subsidiaries		(42,347		)		—				—				—				42,347				—
Accounts payable and accrued expenses		(8,202		)		5,960				(10		)		6,979				(1,482		)		3,245			Depreciation, depletion, and amortization		354				10,178				27,452				29,247				—				67,231
Deferred revenue		—				(1,927		)		1,703				384				—				160			Accretion of asset retirement obligation and receivable		—				63				4,192				8,426				—				12,681
Income tax payable		—				—				(1,679		)		1,706				—				27			Non-cash tax benefits		(4,892		)		—				—				—				—				(4,892		)
Accrual for workers’ compensation		(191		)		—				—				—				—				(191		)	Amortization of intangible assets and liabilities, net		—				622				—				43				—				665
Asset retirement obligations		—				—				(190		)		(3,017		)		—				(3,207		)	Share-based compensation		2,437				37				914				1,934				—				5,322
Accrual for postretirement medical benefits		(100		)		—				1,478				607				—				1,985			Loss on sale of assets		—				—				115				(189		)		—				(74		)
Pension and SERP obligations		320				4				177				241				—				742			Amortization of deferred financing costs		3,165				—				49				517				—				3,731
Other assets and liabilities		(187		)		465				(195		)		4,081				—				4,164			Other		—				—				(1,001		)		—				—				(1,001		)
Distributions received from subsidiaries		19,600				—				—				—				(19,600		)		—			Loss on extinguishment of debt		64				—				—				—				—				64
Net cash provided by (used in) operating activities		(1,472		)		6,915				11,747				18,809				(14,783		)		21,216			Gain on sales of investments		—				—				19				(22		)		—				(3		)
Cash flows from investing activities:																									Changes in operating assets and liabilities:
Additions to property, plant and equipment		(157		)		(134		)		(4,224		)		(786		)		—				(5,301		)	Receivables, net		(18		)		(126		)		9,871				(4,069		)		(13,294		)		(7,636		)
Change in restricted investments and bond collateral and reclamation deposits		(398		)		(3		)		(151		)		(5,883		)		—				(6,435		)	Inventories		—				(3,114		)		187				415				—				(2,512		)
Net proceeds from sales of assets		—				—				309				132				—				441			Excess of black lung benefit obligation over trust assets		319				—				—				—				—				319
Proceeds from the sale of investments		—				—				120				5,499				—				5,619			Accounts payable and accrued expenses		(613		)		5,141				4,082				(9,852		)		14,821				13,579
																									Deferred revenue		—				(8,706		)		972				(1,344		)		—				(9,078		)
Receivable from customer for property and equipment purchases		—				—				—				(49		)		—				(49		)	Income tax payable		—				—				(1,679		)		1,678				—				(1		)
Net cash provided by (used in) investing activities		(555		)		(137		)		(3,946		)		(1,087		)		—				(5,725		)	Accrual for workers’ compensation		(2,069		)		—				—				—				—				(2,069		)
Cash flows from financing activities:																									Asset retirement obligations		—				—				(1,971		)		(7,439		)		—				(9,410		)
Change in book overdrafts		—				—				(7		)		827				—				820
																									Accrual for postretirement medical benefits		101				—				5,620				2,000				—				7,721
Repayments of long-term debt		—				—				(713		)		(5,860		)		—				(6,573		)
																									Pension and SERP obligations		1,391				18				589				390				—				2,388
Borrowings on revolving lines of credit		—				—				—				6,000				—				6,000
																									Other assets and liabilities		(144		)		4,983				8,206				4,124				(5,350		)		11,819
Repayments on revolving lines of credit		—				—				—				(6,000		)		—				(6,000		)
																									Distributions received from subsidiaries		78,000				—				—				—				(78,000		)		—
Debt issuance costs and other refinancing costs		—				—				—				(156		)		—				(156		)
																									Net cash provided by (used in) operating activities		27,621				13,311				73,696				38,931				(72,842		)		80,717
Dividends/distributions		(340		)		(6,500		)		(8,000		)		(5,100		)		19,600				(340		)
																									Cash flows from investing activities:
Transactions with Parent/affiliates		(22,106		)		(16		)		2,255				4,076				15,791				—			Additions to property, plant and equipment		(737		)		(790		)		(17,156		)		(9,908		)		—				(28,591		)
Net cash provided by (used in) financing activities		(22,446		)		(6,516		)		(6,465		)		(6,213		)		35,391				(6,249		)	Change in restricted investments and bond collateral and reclamation deposits		49				(8		)		1,766				(373		)		—				1,434
Net increase (decrease) in cash and cash equivalents		(24,473		)		262				1,336				11,509				20,608				9,242			Net proceeds from sales of assets		—				—				534				368				—				902
Cash and cash equivalents, beginning of period		14,836				4,545				5,362				6,867				—				31,610
Cash and cash equivalents, end of period		$	(9,637	)		$	4,807			$	6,698			$	18,376			$	20,608			$	40,852		Proceeds from the sale of restricted investments		—				—				788				7,499				—				8,287
____________________																									Receivable from customer for property and equipment purchases		—				—				—				(389		)		—				(389		)
(1)    This table is presented for historical information and presents WML and its subsidiaries as non-guarantor subsidiaries. WML and its subsidiaries became additional guarantor subsidiaries effective on July 31, 2014.
																									Other		—				—				(2,500		)		(1,040		)		—				(3,540		)
On July 31, 2014, WML and WML’s four subsidiaries entered into the Fifth Supplemental Indenture (the “Fifth Supplemental Indenture”) to the existing indenture dated as of February 4, 2011, as amended and supplemented (the “Indenture”) among the Company and Westmoreland Partners, as co-issuers (together, the “Co-Issuers”), the guarantors named therein (the “Existing Guarantors”), Wells Fargo Bank, National Association, as trustee, and Wells Fargo Bank, National Association, as note collateral agent, which governs the 10.75% Senior Notes. Pursuant to the Fifth Supplemental Indenture, WML and its subsidiaries (the “New Guarantors”) each became restricted subsidiaries that are subject to the terms and conditions of the Indenture and agreed to guarantee the 10.75% Senior Notes on the same terms and conditions as the other Existing Guarantors. In connection with their entering into the Fifth Supplemental Indenture, the New Guarantors also entered into a Pledge and Security Agreement Supplement by which they secured their obligations under their guarantees and the obligations of the Company and the Co-Issuers under the Indenture.
The following tables present revised unaudited consolidating financial information to reflect WML and its subsidiaries as additional subsidiary guarantors of the 10.75% Senior Notes resulting from the Fifth Supplemental Indenture.																									Net cash provided by (used in) investing activities		(688		)		(798		)		(16,568		)		(3,843		)		—				(21,897		)
CONSOLIDATING BALANCE SHEETS																									Cash flows from financing activities:
March 31, 2014																									Change in book overdrafts		—				—				310				—				—				310
(In thousands)
																									Repayments of long-term debt		(500		)		—				(2,322		)		(25,266		)		—				(28,088		)
																									Borrowings on revolving lines of credit		—				—				—				7,000				—				7,000
Assets		Parent/				Co-Issuer				Guarantor				Non-				Consolidating				Total
		Issuer								Subsidiaries				Guarantor				Adjustments							Repayments on revolving lines of credit		—				—				—				(7,000		)		—				(7,000		)
														Subsidiaries
Current assets:																									Debt issuance costs and other refinancing costs		(26		)		—				—				(156		)		—				(182		)
Cash and cash equivalents		$	28,759			$	4,043			$	27,267			$	1,831			$	—			$	61,900
																									Dividends/distributions		(1,360		)		(14,500		)		(44,500		)		(19,000		)		78,000				(1,360		)
Receivables:
Trade		—				12,456				52,259				—				—				64,715			Transactions with Parent/affiliates		(14,557		)		783				(8,036		)		26,968				(5,158		)		—
Contractual third-party reclamation receivables		—				—				8,213				—				—				8,213			Net cash provided by (used in) financing activities		(16,443		)		(13,717		)		(54,548		)		(17,454		)		72,842				(29,320		)
Intercompany receivable/payable		(15,366		)		—				1,729				(19,073		)		32,710				—			Net increase (decrease) in cash and cash equivalents		10,490				(1,204		)		2,580				17,634				—				29,500
Other		567				208				589				42				(31		)		1,375			Cash and cash equivalents, beginning of year		14,836				4,545				5,362				6,867				—				31,610
		(14,799		)		12,664				62,790				(19,031		)		32,679				74,303			Cash and cash equivalents, end of year		$	25,326			$	3,341			$	7,942			$	24,501			$	—			$	61,110
Inventories		—				1,845				33,602				—				—				35,447			____________________
																									(1)    This table is presented for historical information and presents WML and its subsidiaries as non-guarantor subsidiaries. WML and its subsidiaries became additional guarantor subsidiaries effective on July 31, 2014.
Restricted investments and bond collateral		16,900				—				—				—				—				16,900
																									CONSOLIDATING STATEMENTS OF CASH FLOWS (1)
Other current assets		7,073				425				8,723				421				1				16,643			Year Ended December 31, 2012
																									(In thousands)
Total current assets		37,933				18,977				132,382				(16,779		)		32,680				205,193
Property, plant and equipment:
Land and mineral rights		—				1,395				276,803				—				—				278,198			Statements of Cash Flows		Parent/				Co-Issuer				Guarantor				Non-Guarantor				Consolidating				Total
																											Issuer								Subsidiaries				Subsidiaries				Adjustments
Plant and equipment		4,000				220,932				448,257				—				—				673,189			Cash flows from operating activities:
																									Net income (loss)		$	(13,662	)		$	8,113			$	37,771			$	(4,541	)		$	(41,343	)		$	(13,662	)
		4,000				222,327				725,060				—				—				951,387
																									Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Less accumulated depreciation, depletion and amortization		2,784				74,177				384,794				—				(1		)		461,754			Equity in income of subsidiaries		(45,762		)		—				—				—				45,762				—
Net property, plant and equipment		1,216				148,150				340,266				—				1				489,633			Depreciation, depletion, and amortization		421				10,085				19,571				27,068				—				57,145
Advanced coal royalties		—				—				7,263				—				—				7,263			Accretion of asset retirement obligation and receivable		—				59				4,038				8,092				—				12,189
Reclamation deposits		—				—				75,315				—				—				75,315			Amortization of intangible assets and liabilities, net		—				622				—				36				—				658
Restricted investments and bond collateral		469,385				—				54,098				—				—				523,483			Share-based compensation		2,716				44				559				2,721				—				6,040
Contractual third-party reclamation receivables		—				—				88,036				—				—				88,036			Loss (gain) on sale of assets		13				—				251				264				—				528
Intangible assets		—				871				228				—				—				1,099			Amortization of deferred financing costs		2,889				—				847				622				—				4,358
Investment in subsidiaries		252,832				—				—				3,770				(256,602		)		—			Loss on extinguishment of debt		1,986				—				—				—				—				1,986
Other assets		15,563				—				1,562				3,500				(3,500		)		17,125			Gain on sales of investments		(190		)		—				—				25				—				(165		)
Total assets		$	776,929			$	167,998			$	699,150			$	(9,509	)		$	(227,421	)		$	1,407,147		Changes in operating assets and liabilities:
																									Receivables, net		147				(151		)		(20,910		)		102				7,957				(12,855		)
CONSOLIDATING BALANCE SHEETS
March 31, 2014																									Inventories		—				709				(2,389		)		(484		)		—				(2,164		)
(In thousands)
																									Excess of black lung benefit obligation over trust assets		1,791				—				—				—				—				1,791
																									Accounts payable and accrued expenses		4,981				(3,209		)		18,396				5,453				(8,222		)		17,399
Liabilities and Shareholders’ Deficit		Parent/				Co-Issuer				Guarantor				Non-				Consolidating				Total
		Issuer								Subsidiaries				Guarantor				Adjustments							Deferred revenue		—				(8,312		)		772				(658		)		—				(8,198		)
														Subsidiaries
Current liabilities																									Accrual for workers’ compensation		(2,096		)		—				—				—				—				(2,096		)
Current installments of long-term debt		$	22,785			$	—			$	25,801			$	—			$	—			$	48,586
																									Asset retirement obligations		—				—				(1,198		)		(5,745		)		—				(6,943		)
Accounts payable and accrued expenses:
Trade		11,003				6,331				44,577				688				(1		)		62,598			Accrual for postretirement medical benefits		(524		)		—				4,858				1,857				—				6,191
Production taxes		—				405				43,732				2,657				—				46,794			Pension and SERP obligations		1,286				15				709				792				—				2,802
Workers’ compensation		712				—				—				—				—				712			Other assets and liabilities		(243		)		(536		)		1,047				(10,128		)		2,000				(7,860		)
Postretirement medical benefits		12,042				—				773				1,139				1				13,955			Distributions received from subsidiaries		31,971				—				—				—				(31,971		)		—
SERP		390				—				—				—				—				390			Net cash provided by (used in) operating activities		(14,276		)		7,439				64,322				25,476				(25,817		)		57,144
Deferred revenue		—				9,581				6,453				—				—				16,034			Cash flows from investing activities:
																									Additions to property, plant and equipment		(159		)		(2,067		)		(8,385		)		(10,421		)		—				(21,032		)
Asset retirement obligations		—				—				22,227				—				—				22,227
																									Change in restricted investments and bond collateral and reclamation deposits		(3,248		)		(7		)		(27,504		)		(3,133		)		—				(33,892		)
Other current liabilities		19,196				5,053				172				—				(31		)		24,390
																									Cash payments related to acquisitions and other		4,000				—				(76,522		)		—				—				(72,522		)
Total current liabilities		66,128				21,370				143,735				4,484				(31		)		235,686
																									Net proceeds from sales of assets		—				—				240				240				—				480
Long-term debt, less current installments		677,385				—				77,760				—				(3,500		)		751,645
																									Proceeds from the sale of restricted investments		1,581				—				1,889				636				—				4,106
Workers’ compensation, less current portion		6,680				—				—				—				—				6,680
																									Receivable from customer for property and equipment purchases		—				—				—				(674		)		—				(674		)
Excess of black lung benefit obligation over trust assets		9,376				—				—				—				—				9,376
Postretirement medical benefits, less current portion		185,447				—				67,724				18,104				—				271,275
																									Net cash provided by (used in) investing activities		2,174				(2,074		)		(110,282		)		(13,352		)		—				(123,534		)
Pension and SERP obligations, less current portion		12,921				98				10,264				241				—				23,524
																									Cash flows from financing activities:
Deferred revenue, less current portion		—				38,325				4,974				—				—				43,299			Change in book overdrafts		—				(259		)		6				—				—				(253		)
Asset retirement obligations, less current portion		—				909				258,127				—				—				259,036			Borrowings from long-term debt		119,364				—				—				—				—				119,364
Intangible liabilities		—				5,339				—				—				—				5,339			Repayments of long-term debt		(23,000		)		—				(2,494		)		(19,352		)		—				(44,846		)
Other liabilities		6,440				—				467				596				—				7,503			Borrowings on revolving lines of credit		—				—				—				16,500				—				16,500
Intercompany receivable/payable		18,768				—				(13,502		)		14,654				(19,920		)		—			Repayments on revolving lines of credit		—				—				—				(16,500		)		—				(16,500		)
Total liabilities		983,145				66,041				549,549				38,079				(23,451		)		1,613,363			Debt issuance costs and other refinancing costs		(5,666		)		—				—				(22		)		—				(5,688		)
Shareholders’ deficit																									Dividends/distributions		(1,360		)		(1,050		)		(19,173		)		(11,748		)		31,971				(1,360		)
Preferred stock		121				—				—				—				—				121
																									Transactions with Parent/affiliates		(88,541		)		483				72,840				21,372				(6,154		)		—
Common stock		37,155				5				110				132				(247		)		37,155
																									Net cash provided by (used in) financing activities		797				(826		)		51,179				(9,750		)		25,817				67,217
Other paid-in capital		134,953				52,842				158,051				(124		)		(210,770		)		134,952
																									Net increase (decrease) in cash and cash equivalents		(11,305		)		4,539				5,219				2,374				—				827
Accumulated other comprehensive loss		(63,369		)		(162		)		6,512				(3,077		)		(3,273		)		(63,369		)
																									Cash and cash equivalents, beginning of year		26,141				6				143				4,493				—				30,783
Accumulated earnings (deficit)		(315,076		)		49,272				(15,072		)		(44,519		)		10,320				(315,075		)
																									Cash and cash equivalents, end of year		$	14,836			$	4,545			$	5,362			$	6,867			$	—			$	31,610
Total equity (deficit)		(206,216		)		101,957				149,601				(47,588		)		(203,970		)		(206,216		)
																									____________________
Total liabilities and shareholders’ deficit		$	776,929			$	167,998			$	699,150			$	(9,509	)		$	(227,421	)		$	1,407,147		(1)    This table is presented for historical information and presents WML and its subsidiaries as non-guarantor subsidiaries. WML and its subsidiaries became additional guarantor subsidiaries effective on July 31, 2014.
CONSOLIDATING BALANCE SHEETS																									CONSOLIDATING STATEMENTS OF CASH FLOWS (1)
December 31, 2013																									Year Ended December 31, 2011
(In thousands)																									(In thousands)
Assets		Parent/				Co-Issuer				Guarantor				Non-				Consolidating				Total			Statements of Cash Flows		Parent/				Co-Issuer				Guarantor				Non-Guarantor				Consolidating				Total
		Issuer								Subsidiaries				Guarantor				Adjustments									Issuer								Subsidiaries				Subsidiaries				Adjustments
														Subsidiaries											Cash flows from operating activities:
Current assets:																									Net loss		$	(36,875	)		$	5,089			$	3,463			$	5,073			$	(13,625	)		$	(36,875	)
Cash and cash equivalents		$	25,326			$	3,341			$	27,451			$	4,992			$	—			$	61,110
																									Adjustments to reconcile net loss to net cash provided by operating activities:
Receivables:																									Equity in income of subsidiaries		(18,508		)		—				—				—				18,508				—
Trade		—				12,934				46,985				6,277				—				66,196
																									Depreciation, depletion, and amortization		306				10,175				7,936				27,177				—				45,594
Contractual third-party reclamation receivables		—				—				8,487				—				—				8,487
																									Accretion of asset retirement obligation and receivable		—				55				3,034				7,789				—				10,878
Intercompany receivable/payable		(16,273		)		—				2,761				(19,353		)		32,865				—
																									Amortization of intangible assets and liabilities, net		—				621				—				36				—				657
Other		1,616				210				3,256				28				(24		)		5,086
																									Share-based compensation		1,671				32				249				2,769				—				4,721
		(14,657		)		13,144				61,489				(13,048		)		32,841				79,769
																									Loss (gain) on sale of assets		3				189				59				389				—				640
Inventories		—				6,161				33,811				—				—				39,972
																									Amortization of deferred financing costs		1,485				(21		)		383				668				—				2,515
Deferred income taxes		—				—				870				—				(870		)		—
																									Loss on extinguishment of debt		7,873				9,073				84				—				—				17,030
Restricted investments and bond collateral		—				5,998				—				—				—				5,998
																									Gain on sales of investments		—				—				(75		)		(75		)		—				(150		)
Other current assets		6,144				143				11,069				834				—				18,190
																									Loss on derivative instruments		3,079				—				—				—				—				3,079
Total current assets		16,813				28,787				134,690				(7,222		)		31,971				205,039
																									Changes in operating assets and liabilities:
Property, plant and equipment:																									Receivables, net		(158		)		1,479				(4,343		)		2,263				6,250				5,491
Land and mineral rights		—				1,395				276,793				—				—				278,188
																									Inventories		—				(1,820		)		134				(439		)		—				(2,125		)
Plant and equipment		3,973				220,872				432,851				—				—				657,696
																									Excess of black lung benefit obligation over trust assets		4,319				—				—				—				—				4,319
		3,973				222,267				709,644				—				—				935,884
																									Accounts payable and accrued expenses		5,849				(1,063		)		378				3,103				(4,139		)		4,128
Less accumulated depreciation, depletion and amortization		2,707				71,653				371,488				—				—				445,848
																									Deferred revenue		—				(8,774		)		(349		)		(795		)		—				(9,918		)
Net property, plant and equipment		1,266				150,614				338,156				—				—				490,036
																									Accrual for workers’ compensation		1,248				—				—				—				—				1,248
Advanced coal royalties		—				—				7,311				—				—				7,311
																									Asset retirement obligations		—				—				(875		)		(5,635		)		—				(6,510		)
Reclamation deposits		—				—				74,921				—				—				74,921
																									Accrual for postretirement medical benefits		(2,878		)		—				—				1,235				—				(1,643		)
Restricted investments and bond collateral		15,134				—				54,101				—				—				69,235
																									Pension and SERP obligations		(4,320		)		(50		)		—				3,092				—				(1,278		)
Contractual third-party reclamation receivables		—				—				88,303				—				—				88,303
																									Other assets and liabilities		444				(529		)		3,839				(392		)		(428		)		2,934
Intangible assets		—				1,283				237				—				—				1,520
																									Distributions received from subsidiaries		23,400				—				—				—				(23,400		)		—
Investment in subsidiaries		280,843				—				—				3,770				(284,613		)		—
																									Net cash provided by (used in) operating activities		(13,062		)		14,456				13,917				46,258				(16,834		)		44,735
Other assets		8,636				—				1,683				2,000				(1,999		)		10,320
																									Cash flows from investing activities:
Total assets		$	322,692			$	180,684			$	699,402			$	(1,452	)		$	(254,641	)		$	946,685		Additions to property, plant and equipment		(797		)		(2,119		)		(2,569		)		(22,109		)		—				(27,594		)
CONSOLIDATING BALANCE SHEETS																									Change in restricted investments and bond collateral and reclamation deposits		(1,714		)		2,581				(3,738		)		(3,115		)		—				(5,986		)
December 31, 2013
(In thousands)																									Cash payments related to acquisitions and other		(4,000		)		—				—				—				—				(4,000		)
																									Net proceeds from sales of assets		—				—				250				437				—				687
Liabilities and Shareholders’ Deficit		Parent/				Co-Issuer				Guarantor				Non-				Consolidating				Total			Proceeds from the sale of investments		—				—				1,075				2,275				—				3,350
		Issuer								Subsidiaries				Guarantor				Adjustments
														Subsidiaries
Current liabilities
Current installments of long-term debt		$	20,392			$	—			$	23,951			$	—			$	—			$	44,343		Receivable from customer for property and equipment purchases		—				—				—				(96		)		—				(96		)
Accounts payable and accrued expenses:																									Net cash provided by (used in) investing activities		(6,511		)		462				(4,982		)		(22,608		)		—				(33,639		)
Trade		6,840				10,119				38,061				2,487				—				57,507
																									Cash flows from financing activities:
Production taxes		—				3				36,522				5,380				—				41,905			Change in book overdrafts		(146		)		259				(694		)		(143		)		—				(724		)
Workers’ compensation		717				—				—				—				—				717			Borrowings from long-term debt		142,500				—				—				—				—				142,500
Postretirement medical benefits		12,042				—				774				1,139				—				13,955			Repayments of long-term debt		(2,532		)		(46,220		)		(11,982		)		(12,832		)		—				(73,566		)
SERP		390				—				—				—				—				390			Borrowings on revolving lines of credit		—				1,500				12,200				73,500				—				87,200
Deferred revenue		—				9,024				5,044				—				—				14,068			Repayments on revolving lines of credit		—				(1,500		)		(29,100		)		(75,000		)		—				(105,600		)
Asset retirement obligations		—				—				23,353				—				—				23,353			Debt issuance costs		(6,042		)		(9,077		)		100				—				—				(15,019		)
Other current liabilities		11,302				5,053				457				—				(22		)		16,790			Exercise of stock options		422				—				—				—				—				422
Total current liabilities		51,683				24,199				128,162				9,006				(22		)		213,028			Dividends/distributions		(21,301		)		(10,700		)		—				(12,700		)		23,400				(21,301		)
Long-term debt, less current installments		224,582				—				72,912				—				(2,000		)		295,494			Transactions with Parent/affiliates		(67,458		)		49,946				20,684				3,394				(6,566		)		—
Workers’ compensation, less current portion		6,744				—				—				—				—				6,744			Net cash provided by (used in) financing activities		45,443				(15,792		)		(8,792		)		(23,781		)		16,834				13,912
Excess of black lung benefit obligation over trust assets		8,675				—				—				—				—				8,675			Net increase (decrease) in cash and cash equivalents		25,870				(874		)		143				(131		)		—				25,008
Postretirement medical benefits, less current portion		185,858				—				66,439				18,077				—				270,374			Cash and cash equivalents, beginning of year		271				880				—				4,624				—				5,775
Pension and SERP obligations, less current portion		13,069				99				10,765				243				—				24,176			Cash and cash equivalents, end of year		$	26,141			$	6			$	143			$	4,493			$	—			$	30,783
Deferred revenue, less current portion		—				41,297				5,270				—				—				46,567			____________________
																									(1)    This table is presented for historical information and presents WML and its subsidiaries as non-guarantor subsidiaries. WML and its subsidiaries became additional guarantor subsidiaries effective on July 31, 2014.
Asset retirement obligations, less current portion		—				892				255,619				—				—				256,511
Intangible liabilities		—				5,606				—				—				—				5,606
Other liabilities		5,939				—				6,687				983				(6,220		)		7,389
																									On July 31, 2014, WML and WML’s four subsidiaries entered into the Fifth Supplemental Indenture (the “Fifth Supplemental Indenture”) to the existing indenture dated as of February 4, 2011, as amended and supplemented (the “Indenture”) among the Company and Westmoreland Partners, as co-issuers (together, the “Co-Issuers”), the guarantors named therein (the “Existing Guarantors”), Wells Fargo Bank, National Association, as trustee, and Wells Fargo Bank, National Association, as note collateral agent, which governs the 10.75% Senior Notes. Pursuant to the Fifth Supplemental Indenture, WML and its subsidiaries (the “New Guarantors”) each became restricted subsidiaries that are subject to the terms and conditions of the Indenture and agreed to guarantee the 10.75% Senior Notes on the same terms and conditions as the other Existing Guarantors. In connection with their entering into the Fifth Supplemental Indenture, the New Guarantors also entered into a Pledge and Security Agreement Supplement by which they secured their obligations under their guarantees and the obligations of the Company and the Co-Issuers under the Indenture.
Intercompany receivable/payable		14,021				—				(7,851		)		14,654				(20,824		)		—			The following tables present revised unaudited consolidating financial information to reflect WML and its subsidiaries as additional subsidiary guarantors of the 10.75% Senior Notes resulting from the Fifth Supplemental Indenture.
Total liabilities		510,571				72,093				538,003				42,963				(29,066		)		1,134,564			CONSOLIDATING BALANCE SHEETS
																									December 31, 2013
Shareholders’ deficit																									(In thousands)
Preferred stock		160				—				—				—				—				160
Common stock		36,479				5				110				132				(247		)		36,479
																									Assets		Parent/				Co-Issuer				Guarantor				Non-				Consolidating				Total
Other paid-in capital		134,861				52,835				157,984				(124		)		(210,695		)		134,861					Issuer								Subsidiaries				Guarantor				Adjustments
																																							Subsidiaries
Accumulated other comprehensive loss		(63,595		)		(164		)		6,425				(3,086		)		(3,175		)		(63,595		)	Current assets:
																									Cash and cash equivalents		$	25,326			$	3,341			$	27,451			$	4,992			$	—			$	61,110
Accumulated earnings (deficit)		(295,784		)		55,915				(3,120		)		(41,337		)		(11,458		)		(295,784		)
																									Receivables:
Total equity (deficit)		(187,879		)		108,591				161,399				(44,415		)		(225,575		)		(187,879		)	Trade		—				12,934				46,985				6,277				—				66,196
Total liabilities and shareholders’ deficit		$	322,692			$	180,684			$	699,402			$	(1,452	)		$	(254,641	)		$	946,685		Contractual third-party reclamation receivables		—				—				8,487				—				—				8,487
CONSOLIDATING STATEMENTS OF OPERATIONS																									Intercompany receivable/payable		(16,273		)		—				2,761				(19,353		)		32,865				—
Three Months Ended March 31, 2014
(In thousands)																									Other		1,616				210				3,256				28				(24		)		5,086
																											(14,657		)		13,144				61,489				(13,048		)		32,841				79,769
	Parent/				Co-Issuer				Guarantor				Non-				Consolidating				Total				Inventories		—				6,161				33,811				—				—				39,972
	Issuer								Subsidiaries				Guarantor				Adjustments
													Subsidiaries												Deferred income taxes		—				—				870				—				(870		)		—
Revenues	$	—			$	22,012			$	158,197			$	(7	)		$	—			$	180,202
																									Restricted investments and bond collateral		—				5,998				—				—				—				5,998
Costs and expenses:
Cost of sales	(224		)		16,454				122,345				55				—				138,630				Other current assets		6,144				143				11,069				834				—				18,190
Depreciation, depletion and amortization	77				2,524				13,458				—				—				16,059				Total current assets		16,813				28,787				134,690				(7,222		)		31,971				205,039
Selling and administrative	4,965				894				7,862				(390		)		—				13,331				Property, plant and equipment:
																									Land and mineral rights		—				1,395				276,793				—				—				278,188
Heritage health benefit expenses	3,326				—				—				218				—				3,544
																									Plant and equipment		3,973				220,872				432,851				—				—				657,696
Loss (gain) on sales of assets	—				—				38				—				—				38
																											3,973				222,267				709,644				—				—				935,884
Restructuring charges	—				397				—				—				—				397
																									Less accumulated depreciation, depletion and amortization		2,707				71,653				371,488				—				—				445,848
Other operating income	—				—				150				—				—				150
																									Net property, plant and equipment		1,266				150,614				338,156				—				—				490,036
	8,144				20,269				143,853				(117		)		—				172,149
																									Advanced coal royalties		—				—				7,311				—				—				7,311
Operating income (loss)	(8,144		)		1,743				14,344				110				—				8,053
																									Reclamation deposits		—				—				74,921				—				—				74,921
Other income (expense):
Interest expense	(18,673		)		(44		)		(2,088		)		—				7				(20,798		)		Restricted investments and bond collateral		15,134				—				54,101				—				—				69,235
Interest income	123				4				175				7				(7		)		302				Contractual third-party reclamation receivables		—				—				88,303				—				—				88,303
Loss on foreign exchange	(6,790		)		—				—				—				—				(6,790		)		Intangible assets		—				1,283				237				—				—				1,520
Other income	1				—				93				(1		)		—				93				Investment in subsidiaries		280,843				—				—				3,770				(284,613		)		—
	(25,339		)		(40		)		(1,820		)		6				—				(27,193		)		Other assets		8,636				—				1,683				2,000				(1,999		)		10,320
Income (loss) before income taxes and income of consolidated subsidiaries	(33,483		)		1,703				12,524				116				—				(19,140		)		Total assets		$	322,692			$	180,684			$	699,402			$	(1,452	)		$	(254,641	)		$	946,685
Equity in income of subsidiaries	14,315				—				—				—				(14,315		)		—				CONSOLIDATING BALANCE SHEETS
																									December 31, 2013
Income (loss) before income taxes	(19,168		)		1,703				12,524				116				(14,315		)		(19,140		)		(In thousands)
Income tax expense (benefit)	(138		)		—				5,115				—				(5,087		)		(110		)
Net income (loss)	(19,030		)		1,703				7,409				116				(9,228		)		(19,030		)		Liabilities and Shareholders’ Deficit		Parent/				Co-Issuer				Guarantor				Non-				Consolidating				Total
																											Issuer								Subsidiaries				Guarantor				Adjustments
Less net loss attributable to noncontrolling interest	—				—				—				—				—				—																		Subsidiaries
																									Current liabilities
Net income (loss) attributable to the Parent company	$	(19,030	)		$	1,703			$	7,409			$	116			$	(9,228	)		$	(19,030	)		Current installments of long-term debt		$	20,392			$	—			$	23,951			$	—			$	—			$	44,343
CONSOLIDATING STATEMENTS OF OPERATIONS																									Accounts payable and accrued expenses:
Three Months Ended March 31, 2013																									Trade		6,840				10,119				38,061				2,487				—				57,507
(In thousands)
																									Production taxes		—				3				36,522				5,380				—				41,905
																									Workers’ compensation		717				—				—				—				—				717
	Parent/				Co-Issuer				Guarantor				Non-				Consolidating				Total
	Issuer								Subsidiaries				Guarantor				Adjustments								Postretirement medical benefits		12,042				—				774				1,139				—				13,955
													Subsidiaries
Revenues	$	—			$	19,336			$	139,738			$	11,350			$	(8,976	)		$	161,448			SERP		390				—				—				—				—				390
Costs and expenses:																									Deferred revenue		—				9,024				5,044				—				—				14,068
Cost of sales	(398		)		16,954				109,777				13,064				(8,976		)		130,421
																									Asset retirement obligations		—				—				23,353				—				—				23,353
Depreciation, depletion and amortization	94				2,531				11,801				—				—				14,426
																									Other current liabilities		11,302				5,053				457				—				(22		)		16,790
Selling and administrative	3,949				855				7,448				(365		)		—				11,887
																									Total current liabilities		51,683				24,199				128,162				9,006				(22		)		213,028
Heritage health benefit expenses	3,689				—				—				262				—				3,951
																									Long-term debt, less current installments		224,582				—				72,912				—				(2,000		)		295,494
Gain on sales of assets	—				—				(234		)		—				—				(234		)
																									Workers’ compensation, less current portion		6,744				—				—				—				—				6,744
Other operating income	—				—				(4,737		)		—				—				(4,737		)
																									Excess of black lung benefit obligation over trust assets		8,675				—				—				—				—				8,675
	7,334				20,340				124,055				12,961				(8,976		)		155,714
																									Postretirement medical benefits, less current portion		185,858				—				66,439				18,077				—				270,374
Operating income (loss)	(7,334		)		(1,004		)		15,683				(1,611		)		—				5,734
																									Pension and SERP obligations, less current portion		13,069				99				10,765				243				—				24,176
Other income (expense):
Interest expense	(7,584		)		(10		)		(2,569		)		(5		)		8				(10,160		)		Deferred revenue, less current portion		—				41,297				5,270				—				—				46,567
Interest income	30				10				261				4				(8		)		297				Asset retirement obligations, less current portion		—				892				255,619				—				—				256,511
Other income (loss)	—				—				70				—				—				70				Intangible liabilities		—				5,606				—				—				—				5,606
	(7,554		)		—				(2,238		)		(1		)		—				(9,793		)		Other liabilities		5,939				—				6,687				983				(6,220		)		7,389
Income (loss) before income taxes and income of consolidated subsidiaries	(14,888		)		(1,004		)		13,445				(1,612		)		—				(4,059		)		Intercompany receivable/payable		14,021				—				(7,851		)		14,654				(20,824		)		—
Equity in income of subsidiaries	10,801				—				—				—				(10,801		)		—				Total liabilities		510,571				72,093				538,003				42,963				(29,066		)		1,134,564
Income (loss) before income taxes	(4,087		)		(1,004		)		13,445				(1,612		)		(10,801		)		(4,059		)		Shareholders’ deficit
																									Preferred stock		160				—				—				—				—				160
Income tax expense (benefit)	—				—				3,319				—				(3,291		)		28
																									Common stock		36,479				5				110				132				(247		)		36,479
Net income (loss)	(4,087		)		(1,004		)		10,126				(1,612		)		(7,510		)		(4,087		)
																									Other paid-in capital		134,861				52,835				157,984				(124		)		(210,695		)		134,861
Less net loss attributable to noncontrolling interest	(1,702		)		—				—				—				—				(1,702		)
																									Accumulated other comprehensive income (loss)		(63,595		)		(164		)		6,425				(3,086		)		(3,175		)		(63,595		)
Net income (loss) attributable to the Parent company	$	(2,385	)		$	(1,004	)		$	10,126			$	(1,612	)		$	(7,510	)		$	(2,385	)
																									Accumulated earnings (deficit)		(295,784		)		55,915				(3,120		)		(41,337		)		(11,458		)		(295,784		)
																									Total Westmoreland Coal Company shareholders’ deficit		(187,879		)		108,591				161,399				(44,415		)		(225,575		)		(187,879		)
CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS)
Three Months Ended March 31, 2014																									Noncontrolling interest		—				—				—				—				—				—
(In thousands)
																									Total equity (deficit)		(187,879		)		108,591				161,399				(44,415		)		(225,575		)		(187,879		)
	Parent/				Co-Issuer				Guarantor				Non-				Consolidating				Total				Total liabilities and shareholders’ deficit		$	322,692			$	180,684			$	699,402			$	(1,452	)		$	(254,641	)		$	946,685
	Issuer								Subsidiaries				Guarantor				Adjustments
													Subsidiaries												CONSOLIDATING BALANCE SHEETS
Net income (loss)	$	(19,030	)		$	1,703			$	7,409			$	116			$	(9,228	)		$	(19,030	)		December 31, 2012
																									(In thousands)
Other comprehensive income (loss)
Amortization of accumulated actuarial gains or losses, pension	359				2				122				6				(130		)		359
Amortization of accumulated actuarial gains or losses, transition obligations, and prior service costs, postretirement medical benefit	5				—				(36		)		5				31				5				Assets		Parent/				Co-Issuer				Guarantor				Non-				Consolidating				Total
																											Issuer								Subsidiaries				Guarantor				Adjustments
Tax effect of other comprehensive income gains	(138		)		—				—				—				—				(138		)																Subsidiaries
																									Current assets:
Other comprehensive income (loss)	226				2				86				11				(99		)		226				Cash and cash equivalents		$	14,836			$	4,545			$	10,236			$	1,993			$	—			$	31,610
Comprehensive income (loss) attributable to the Parent company	$	(18,804	)		$	1,705			$	7,495			$	127			$	(9,327	)		$	(18,804	)		Receivables:
																									Trade		—				13,018				43,420				3,599				—				60,037
CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS)																									Contractual third-party reclamation receivables		—				—				10,207				—				—				10,207
Three Months Ended March 31, 2013
(In thousands)																									Intercompany receivable/payable		(17,309		)		—				2,595				(18,262		)		32,976				—
																									Other		680				—				17,377				8				(14,845		)		3,220
	Parent/				Co-Issuer				Guarantor				Non-				Consolidating				Total
	Issuer								Subsidiaries				Guarantor				Adjustments										(16,629		)		13,018				73,599				(14,655		)		18,131				73,464
													Subsidiaries
Net income (loss)	$	(4,087	)		$	(1,004	)		$	10,126			$	(1,612	)		$	(7,510	)		$	(4,087	)		Inventories		—				3,047				34,687				—				—				37,734
Other comprehensive income (loss)																									Other current assets		743				298				15,463				—				—				16,504
Amortization of accumulated actuarial gains or losses, pension	741				6				180				13				(199		)		741
																									Total current assets		(1,050		)		20,908				133,985				(12,662		)		18,131				159,312
Amortization of accumulated actuarial gains or losses, transition obligations, and prior service costs, postretirement medical benefit	1,001				—				144				69				(213		)		1,001
																									Property, plant and equipment:
Other comprehensive income (loss)	1,742				6				324				82				(412		)		1,742				Land and mineral rights		—				1,395				260,346				—				—				261,741
Comprehensive income (loss) attributable to the Parent company	$	(2,345	)		$	(998	)		$	10,450			$	(1,530	)		$	(7,922	)		$	(2,345	)		Plant and equipment		3,198				219,857				412,665				—				—				635,720
																											3,198				221,252				673,011				—				—				897,461
CONSOLIDATING STATEMENTS OF CASH FLOWS																									Less accumulated depreciation, depletion and amortization		2,364				61,474				320,783				—				—				384,621
Three Months Ended March 31, 2014
(In thousands)																									Net property, plant and equipment		834				159,778				352,228				—				—				512,840
																									Advanced coal royalties		—				—				4,316				—				—				4,316
Statements of Cash Flows		Parent/				Co-Issuer				Guarantor				Non-				Consolidating				Total			Reclamation deposits		—				—				72,718				—				—				72,718
		Issuer								Subsidiaries				Guarantor				Adjustments
														Subsidiaries											Restricted investments and bond collateral		15,183				5,990				66,036				—				—				87,209
Cash flows from operating activities:
Net income (loss)		$	(19,030	)		$	1,703			$	7,409			$	116			$	(9,228	)		$	(19,030	)	Contractual third-party reclamation receivables		—				—				84,158				—				—				84,158
Adjustments to reconcile net income (loss) to net cash provided by operating activities:																									Intangible assets		—				2,923				280				—				—				3,203
Equity in income of subsidiaries		(14,315		)		—				—				—				14,315				—
																									Investment in subsidiaries		257,773				—				(792		)		3,770				(260,751		)		—
Depreciation, depletion, and amortization		77				2,524				13,458				—				—				16,059
																									Other assets		10,267				—				2,092				2,000				(2,000		)		12,359
Accretion of asset retirement obligation and receivable		—				18				3,461				—				—				3,479
																									Total assets		$	283,007			$	189,599			$	715,021			$	(6,892	)		$	(244,620	)		$	936,115
Non-cash tax benefits		(138		)		—				—				—				—				(138		)
																									CONSOLIDATING BALANCE SHEETS
Amortization of intangible assets and liabilities, net		—				146				7				—				—				153			December 31, 2012
																									(In thousands)
Share-based compensation		569				7				66				86				—				728
Loss (gain) on sales of assets		—				—				36				2				—				38
																									Liabilities and Shareholders’ Deficit		Parent/				Co-Issuer				Guarantor				Non-Guarantor				Consolidating				Total
Amortization of deferred financing costs		149				—				105				17				—				271					Issuer								Subsidiaries				Subsidiaries				Adjustments
																									Current liabilities
Loss on foreign exchange		6,790				—				—				—				—				6,790			Current installments of long-term debt		$	(1,548	)		$	—			$	25,339			$	—			$	—			$	23,791
Changes in operating assets and liabilities:																									Accounts payable and accrued expenses:
Receivables, net		1,049				480				(2,597		)		4,736				1,534				5,202			Trade		5,060				4,978				40,715				16,181				(14,841		)		52,093
Inventories		—				4,316				209				—				—				4,525			Production taxes		—				3				28,856				4,369				—				33,228
Excess of black lung benefit obligation over trust assets		701				—				—				—				—				701			Workers’ compensation		820				—				—				—				—				820
Accounts payable and accrued expenses		4,955				(3,386		)		13,923				(4,522		)		(11		)		10,959			Postretirement medical benefits		12,494				—				449				1,125				—				14,068
Deferred revenue		—				(2,415		)		1,113				—				—				(1,302		)	SERP		390				—				—				—				—				390
Income tax payable		—				—				28				—				—				28			Deferred revenue		—				8,788				4,034				—				—				12,822
Accrual for workers’ compensation		(69		)		—				—				—				—				(69		)	Asset retirement obligations		—				—				22,238				—				—				22,238
Asset retirement obligations		—				—				(1,352		)		—				—				(1,352		)	Other current liabilities		11,311				—				155				—				(4		)		11,462
Accrual for postretirement medical benefits		(374		)		—				1,248				32				—				906			Total current liabilities		28,527				13,769				121,786				21,675				(14,845		)		170,912
Pension and SERP obligations		83				1				(379		)		2				—				(293		)	Long-term debt, less current installments		245,456				—				93,742				—				(2,000		)		337,198
Other assets and liabilities		(183		)		(309		)		(2,880		)		(1,621		)		6,986				1,993			Workers’ compensation, less current portion		8,710				—				—				—				—				8,710
Distributions received from subsidiaries		42,500				—				—				—				(42,500		)		—			Excess of black lung benefit obligation over trust assets		8,356				—				—				—				—				8,356
Net cash provided by (used in) operating activities		22,764				3,085				33,855				(1,152		)		(28,904		)		29,648			Postretirement medical benefits, less current portion		224,336				—				74,589				20,850				—				319,775
Cash flows from investing activities:																									Pension and SERP obligations, less current portion		29,265				289				23,955				741				—				54,250
Additions to property, plant and equipment		38				(35		)		(3,053		)		—				—				(3,050		)
																									Deferred revenue, less current portion		—				50,239				6,652				—				—				56,891
Change in restricted investments and bond collateral and reclamation deposits		(471,151		)		5,998				(391		)		—				—				(465,544		)
																									Asset retirement obligations, less current portion		—				829				240,780				—				—				241,609
																									Intangible liabilities		—				6,625				—				—				—				6,625
Receivable from customer for property and equipment purchases		—				—				(10		)		—				—				(10		)
																									Other liabilities		701				—				16,145				1,174				—				18,020
Other		—				—				(60		)		—				—				(60		)
																									Intercompany receivable/payable		23,887				—				13,004				14,654				(51,545		)		—
Net cash provided by (used in) investing activities		(471,113		)		5,963				(3,514		)		—				—				(468,664		)
																									Total liabilities		569,238				71,751				590,653				59,094				(68,390		)		1,222,346
Cash flows from financing activities:
Change in book overdrafts		—				—				(315		)		—				—				(315		)	Shareholders’ deficit
																									Preferred stock		160				—				—				—				—				160
Borrowings from long-term debt		454,219				—				—				—				—				454,219
																									Common stock		35,502				5				110				132				(247		)		35,502
Repayments of long-term debt		—				—				(6,232		)		(7		)		—				(6,239		)
																									Other paid-in capital		130,852				52,806				155,585				(124		)		(208,267		)		130,852
Debt issuance costs and other refinancing costs		(7,598		)		—				—				—				—				(7,598		)
																									Accumulated other comprehensive loss		(148,345		)		(372		)		(22,777		)		(6,702		)		29,851				(148,345		)
Dividends/distributions		(261		)		(8,500		)		(34,000		)		—				42,500				(261		)
																									Accumulated earnings (deficit)		(289,727		)		65,409				(8,550		)		(59,292		)		2,433				(289,727		)
Transactions with Parent/affiliates		5,422				154				10,022				(2,002		)		(13,596		)		—
																									Total Westmoreland Coal Company shareholders’ deficit		(271,558		)		117,848				124,368				(65,986		)		(176,230		)		(271,558		)
Net cash provided by (used in) financing activities		451,782				(8,346		)		(30,525		)		(2,009		)		28,904				439,806
																									Noncontrolling interest		(14,673		)		—				—				—				—				(14,673		)
Net increase (decrease) in cash and cash equivalents		3,433				702				(184		)		(3,161		)		—				790
																									Total equity (deficit)		(286,231		)		117,848				124,368				(65,986		)		(176,230		)		(286,231		)
Cash and cash equivalents, beginning of period		25,326				3,341				27,451				4,992				—				61,110
																									Total liabilities and shareholders’ deficit		$	283,007			$	189,599			$	715,021			$	(6,892	)		$	(244,620	)		$	936,115
Cash and cash equivalents, end of period		$	28,759			$	4,043			$	27,267			$	1,831			$	—			$	61,900
																									CONSOLIDATING STATEMENTS OF OPERATIONS
CONSOLIDATING STATEMENTS OF CASH FLOWS																									Year Ended December 31, 2013
Three Months Ended March 31, 2013																									(In thousands)
(In thousands)
																										Parent/				Co-Issuer				Guarantor				Non-Guarantor				Consolidating				Total
Statements of Cash Flows		Parent/				Co-Issuer				Guarantor				Non-				Consolidating				Total				Issuer								Subsidiaries				Subsidiaries				Adjustments
		Issuer								Subsidiaries				Guarantor				Adjustments							Revenues	$	—			$	87,567			$	571,021			$	57,545			$	(41,447	)		$	674,686
														Subsidiaries
Cash flows from operating activities:																									Costs and expenses:
Net income (loss)		$	(4,087	)		$	(1,004	)		$	10,126			$	(1,612	)		$	(7,510	)		$	(4,087	)	Cost of sales	(1,525		)		63,794				453,508				60,990				(41,447		)		535,320
Adjustments to reconcile net income (loss) to net cash provided by operating activities:																									Depreciation, depletion and amortization	357				10,178				56,696				—				—				67,231
Equity in income of subsidiaries		(10,801		)		—				—				—				10,801				—
																									Selling and administrative	19,027				3,609				30,596				(2,511		)		—				50,721
Depreciation, depletion, and amortization		94				2,531				11,801				—				—				14,426
																									Heritage health benefit expenses	12,361				—				—				1,057				—				13,418
Accretion of asset retirement obligation and receivable		—				16				3,164				—				—				3,180
																									Loss (gain) on sales of assets	—				—				(74		)		—				—				(74		)
Amortization of intangible assets and liabilities, net		—				156				8				—				—				164
																									Restructuring charges	—				5,078				—				—				—				5,078
Share-based compensation		796				10				1,581				(1		)		—				2,386
																									Other operating income	—				—				(22,370		)		—				—				(22,370		)
Gain on sales of assets		—				—				(234		)		—				—				(234		)
																										30,220				82,659				518,356				59,536				(41,447		)		649,324
Amortization of deferred financing costs		771				—				163				(1		)		—				933
																									Operating income (loss)	(30,220		)		4,908				52,665				(1,991		)		—				25,362
Loss on sales of investment securities		—				—				7				—				—				7
																									Other income (expense):
Changes in operating assets and liabilities:																									Interest expense	(30,417		)		(39		)		(9,495		)		(21		)		35				(39,937		)
Receivables, net		205				2,885				(3,837		)		(2,141		)		3,008				120
																									Loss on extinguishment of debt	(64		)		—				—				—				—				(64		)
Inventories		—				(2,181		)		(507		)		1				—				(2,687		)
																									Interest income	165				26				1,190				20				(35		)		1,366
Excess of black lung benefit obligation over trust assets		83				—				—				—				—				83
																									Other income	—				—				364				—				—				364
Accounts payable and accrued expenses		(8,388		)		5,959				5,524				1,630				(1,480		)		3,245
																										(30,316		)		(13		)		(7,941		)		(1		)		—				(38,271		)
Deferred revenue		—				(1,927		)		2,087				—				—				160
																									Income (loss) before income taxes and income of consolidated subsidiaries	(60,536		)		4,895				44,724				(1,992		)		—				(12,909		)
Income tax payable		—				—				27				—				—				27
																									Equity in income of subsidiaries	47,514				—				—				—				(47,514		)		—
Accrual for workers’ compensation		(191		)		—				—				—				—				(191		)
																									Loss before income taxes	(13,022		)		4,895				44,724				(1,992		)		(47,514		)		(12,909		)
Asset retirement obligations		—				—				(3,206		)		(1		)		—				(3,207		)
																									Income tax expense (benefit)	(4,895		)		680				8,414				—				(8,981		)		(4,782		)
Accrual for postretirement medical benefits		(100		)		—				1,941				144				—				1,985
																									Net income (loss)	(8,127		)		4,215				36,310				(1,992		)		(38,533		)		(8,127		)
Pension and SERP obligations		320				4				400				18				—				742
																									Less net loss attributable to noncontrolling interest	(3,430		)		—				—				—				—				(3,430		)
Other assets and liabilities		(187		)		465				3,650				236				—				4,164
																									Net income (loss) attributable to the Parent company	$	(4,697	)		$	4,215			$	36,310			$	(1,992	)		$	(38,533	)		$	(4,697	)
Distributions received from subsidiaries		19,600				—				—				—				(19,600		)		—
																									CONSOLIDATING STATEMENTS OF OPERATIONS
Net cash provided by (used in) operating activities		(1,885		)		6,914				32,695				(1,727		)		(14,781		)		21,216			Year Ended December 31, 2012
																									(In thousands)
Cash flows from investing activities:
Additions to property, plant and equipment		(183		)		(134		)		(4,988		)		4				—				(5,301		)
Change in restricted investments and bond collateral and reclamation deposits		(398		)		(3		)		(6,033		)		(1		)		—				(6,435		)		Parent/				Co-Issuer				Guarantor				Non-Guarantor				Consolidating				Total
																										Issuer								Subsidiaries				Subsidiaries				Adjustments
Net proceeds from sales of assets		—				—				441				—				—				441			Revenues	$	—			$	81,285			$	511,570			$	39,041			$	(31,459	)		$	600,437
Proceeds from the sale of investments		—				—				5,619				—				—				5,619			Costs and expenses:
																									Cost of sales	(587		)		59,299				393,793				45,475				(31,459		)		466,521
																									Depreciation, depletion and amortization	421				10,085				46,639				—				—				57,145
Receivable from customer for property and equipment purchases		—				—				(49		)		—				—				(49		)
																									Selling and administrative	18,407				3,657				29,334				37				(1,527		)		49,908
Net cash provided by (used in) investing activities		(581		)		(137		)		(5,010		)		3				—				(5,725		)
																									Heritage health benefit expenses	12,406				—				(1		)		983				—				13,388
Cash flows from financing activities:
Change in book overdrafts		—				—				820				—				—				820			Loss on sales of assets	13				—				515				—				—				528
Repayments of long-term debt		—				—				(6,565		)		(8		)		—				(6,573		)	Other operating income	—				—				(17,452		)		—				1,527				(15,925		)
Borrowings on revolving lines of credit		—				—				6,000				—				—				6,000				30,660				73,041				452,828				46,495				(31,459		)		571,565
Repayments on revolving lines of credit		—				—				(6,000		)		—				—				(6,000		)	Operating income (loss)	(30,660		)		8,244				58,742				(7,454		)		—				28,872
Debt issuance costs and other refinancing costs		—				—				(156		)		—				—				(156		)	Other income (expense):
																									Interest expense	(31,301		)		(39		)		(11,349		)		(68		)		80				(42,677		)
Dividends/distributions		(340		)		(6,500		)		(13,100		)		—				19,600				(340		)
																									Loss on extinguishment of debt	(1,986		)		—				—				—				—				(1,986		)
Transactions with Parent/affiliates		(1,059		)		(15		)		4,212				1,681				(4,819		)		—
																									Interest income	253				15				1,289				19				(80		)		1,496
Net cash provided by (used in) financing activities		(1,399		)		(6,515		)		(14,789		)		1,673				14,781				(6,249		)
																									Other income	190				—				533				—				—				723
Net increase (decrease) in cash and cash equivalents		(3,865		)		262				12,896				(51		)		—				9,242
																										(32,844		)		(24		)		(9,527		)		(49		)		—				(42,444		)
Cash and cash equivalents, beginning of period		14,836				4,545				10,236				1,993				—				31,610
																									Income (loss) before income taxes and income of consolidated subsidiaries	(63,504		)		8,220				49,215				(7,503		)		—				(13,572		)
Cash and cash equivalents, end of period		$	10,971			$	4,807			$	23,132			$	1,942			$	—			$	40,852
																									Equity in income of subsidiaries	49,834				—				—				—				(49,834		)		—
																									Income (loss) before income taxes	(13,670		)		8,220				49,215				(7,503		)		(49,834		)		(13,572		)
																									Income tax expense (benefit)	(8		)		107				4,410				—				(4,419		)		90
																									Net income (loss)	(13,662		)		8,113				44,805				(7,503		)		(45,415		)		(13,662		)
																									Less net loss attributable to noncontrolling interest	(6,436		)		—				—				—				—				(6,436		)
																									Net income (loss) attributable to the Parent company	$	(7,226	)		$	8,113			$	44,805			$	(7,503	)		$	(45,415	)		$	(7,226	)
																									CONSOLIDATING STATEMENTS OF OPERATIONS
																									Year Ended December 31, 2011
																									(In thousands)
																										Parent/				Co-Issuer				Guarantor				Non-Guarantor				Consolidating				Total
																										Issuer								Subsidiaries				Subsidiaries				Adjustments
																									Revenues	$	—			$	86,785			$	390,621			$	79,831			$	(55,524	)		$	501,713
																									Costs and expenses:
																									Cost of sales	(158		)		60,243				304,652				83,574				(55,524		)		392,787
																									Depreciation, depletion and amortization	306				10,175				35,113				—				—				45,594
																									Selling and administrative	13,394				4,059				23,850				(554		)		(473		)		40,276
																									Heritage health benefit expenses	17,754				—				—				821				—				18,575
																									Gain (loss) on sales of assets	3				189				448				—				—				640
																									Other operating income	—				—				(7,258		)		—				473				(6,785		)
																										31,299				74,666				356,805				83,841				(55,524		)		491,087
																									Operating income (loss)	(31,299		)		12,119				33,816				(4,010		)		—				10,626
																									Other income (expense):
																									Interest expense	(16,365		)		(469		)		(12,957		)		(70		)		92				(29,769		)
																									Loss on extinguishment of debt	(7,873		)		(9,073		)		(84		)		—				—				(17,030		)
																									Interest income	266				14				1,229				27				(92		)		1,444
																									Other income (loss)	(3,014		)		—				418				24				—				(2,572		)
																										(26,986		)		(9,528		)		(11,394		)		(19		)		—				(47,927		)
																									Loss before income taxes and income of consolidated subsidiaries	(58,285		)		2,591				22,422				(4,029		)		—				(37,301		)
																									Equity in income of subsidiaries	21,128				—				—				—				(21,128		)		—
																									Loss before income taxes	(37,157		)		2,591				22,422				(4,029		)		(21,128		)		(37,301		)
																									Income tax expense (benefit)	(282		)		(2,498		)		7,236				—				(4,882		)		(426		)
																									Net income (loss)	(36,875		)		5,089				15,186				(4,029		)		(16,246		)		(36,875		)
																									Less net loss attributable to noncontrolling interest	(3,775		)		—				—				—				—				(3,775		)
																									Net loss attributable to the Parent company	$	(33,100	)		$	5,089			$	15,186			$	(4,029	)		$	(16,246	)		$	(33,100	)
																									CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS)
																									Year Ended December 31, 2013
																									(In thousands)
																										Parent/Issuer				Co-Issuer				Guarantor				Non-Guarantor				Consolidating				Total
																																		Subsidiaries				Subsidiaries				Adjustments
																									Net income (loss)	$	(8,127	)		$	4,215			$	36,310			$	(1,992	)		$	(38,533	)		$	(8,127	)
																									Other comprehensive income (loss)
																									Amortization of accumulated actuarial gains or losses, pension	3,490				28				801				61				(890		)		3,490
																									Adjustments to accumulated actuarial losses and transition obligations, pension	28,974				180				13,331				475				(13,986		)		28,974
																									Amortization of accumulated actuarial gains or losses, transition obligations, and prior service costs, postretirement medical benefit	4,005				—				577				275				(852		)		4,005
																									Adjustments to accumulated actuarial gains and transition obligations, postretirement medical benefits	53,230				180				14,548				2,804				(17,532		)		53,230
																									Tax effect of other comprehensive income gains	(4,892		)		—				—				—				—				(4,892		)
																									Unrealized and realized gains and losses on available-for-sale securities	(57		)		—				(55		)		—				55				(57		)
																									Other comprehensive income	84,750				388				29,202				3,615				(33,205		)		84,750
																									Comprehensive income attributable to Westmoreland Coal Company	$	76,623			$	4,603			$	65,512			$	1,623			$	(71,738	)		$	76,623
																									CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS)
																									Year Ended December 31, 2012
																									(In thousands)
																										Parent/Issuer				Co-Issuer				Guarantor				Non-Guarantor				Consolidating				Total
																																		Subsidiaries				Subsidiaries				Adjustments
																									Net income (loss)	$	(13,662	)		$	8,113			$	44,805			$	(7,503	)		$	(45,415	)		$	(13,662	)
																									Other comprehensive income (loss)
																									Amortization of accumulated actuarial gains or losses, pension	2,960				23				720				46				(789		)		2,960
																									Adjustments to accumulated actuarial losses and transition obligations, pension	(9,812		)		(52		)		(5,144		)		(22		)		5,218				(9,812		)
																									Amortization of accumulated actuarial gains or losses, transition obligations, and prior service costs, postretirement medical benefit	2,572				—				823				150				(973		)		2,572
																									Adjustments to accumulated actuarial gains and transition obligations, postretirement medical benefits	(22,342		)		—				(1,367		)		(1,467		)		2,834				(22,342		)
																									Unrealized and realized gains and losses on available-for-sale securities	(268		)		—				(64		)		—				64				(268		)
																									Other comprehensive income (loss)	(26,890		)		(29		)		(5,032		)		(1,293		)		6,354				(26,890		)
																									Comprehensive income (loss) attributable to Westmoreland Coal Company	$	(40,552	)		$	8,084			$	39,773			$	(8,796	)		$	(39,061	)		$	(40,552	)
																									CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS)
																									Year Ended December 31, 2011
																									(In thousands)
																										Parent/Issuer				Co-Issuer				Guarantor				Non-Guarantor				Consolidating				Total
																																		Subsidiaries				Subsidiaries				Adjustments
																									Net income (loss)	$	(36,875	)		$	5,089			$	15,186			$	(4,029	)		$	(16,246	)		$	(36,875	)
																									Other comprehensive income (loss)
																									Amortization of accumulated actuarial gains or losses, pension	1,647				9				86				36				(131		)		1,647
																									Adjustments to accumulated actuarial losses and transition obligations, pension	(15,798		)		(150		)		72				(516		)		594				(15,798		)
																									Amortization of accumulated actuarial gains or losses, transition obligations, and prior service costs, postretirement medical benefit	(288		)		—				348				(54		)		(294		)		(288		)
																									Adjustments to accumulated actuarial gains and transition obligations, postretirement medical benefits	(49,136		)		—				(5,934		)		(3,335		)		9,269				(49,136		)
																									Unrealized and realized gains and losses on available-for-sale securities	(200		)		—				(203		)		—				203				(200		)
																									Other comprehensive income (loss)	(63,775		)		(141		)		(5,631		)		(3,869		)		9,641				(63,775		)
																									Comprehensive income (loss) attributable to Westmoreland Coal Company	$	(100,650	)		$	4,948			$	9,555			$	(7,898	)		$	(6,605	)		$	(100,650	)
																									CONSOLIDATING STATEMENTS OF CASH FLOWS
																									Year Ended December 31, 2013
																									(In thousands)
																									Statements of Cash Flows		Parent/				Co-Issuer				Guarantor				Non-Guarantor				Consolidating				Total
																											Issuer								Subsidiaries				Subsidiaries				Adjustments
																									Cash flows from operating activities:
																									Net income (loss)		$	(8,127	)		$	4,215			$	36,310			$	(1,992	)		$	(38,533	)		$	(8,127	)
																									Adjustments to reconcile net income (loss) to net cash provided by operating activities:
																									Equity in income of subsidiaries		(47,514		)		—				—				—				47,514				—
																									Depreciation, depletion, and amortization		357				10,178				56,696				—				—				67,231
																									Accretion of asset retirement obligation and receivable		—				63				12,618				—				—				12,681
																									Non-cash tax benefits		(4,892		)		—				—				—				—				(4,892		)
																									Amortization of intangible assets and liabilities, net		—				622				43				—				—				665
																									Share-based compensation		2,887				37				2,398				—				—				5,322
																									Loss on sale of assets		—				—				(74		)		—				—				(74		)
																									Amortization of deferred financing costs		3,165				—				566				—				—				3,731
																									Other		—				—				(1,001		)		—				—				(1,001		)
																									Loss on extinguishment of debt		64				—				—				—				—				64
																									Gain on sales of investments		—				—				(3		)		—				—				(3		)
																									Changes in operating assets and liabilities:
																									Receivables, net		(936		)		(126		)		10,945				(4,225		)		(13,294		)		(7,636		)
																									Inventories		—				(3,114		)		602				—				—				(2,512		)
																									Excess of black lung benefit obligation over trust assets		319				—				—				—				—				319
																									Accounts payable and accrued expenses		1,753				5,141				4,545				(12,683		)		14,823				13,579
																									Deferred revenue		—				(8,706		)		(372		)		—				—				(9,078		)
																									Income tax payable		—				—				(1		)		—				—				(1		)
																									Accrual for workers’ compensation		(2,069		)		—				—				—				—				(2,069		)
																									Asset retirement obligations		—				—				(9,410		)		—				—				(9,410		)
																									Accrual for postretirement medical benefits		101				—				7,300				320				—				7,721
																									Pension and SERP obligations		1,391				18				941				38				—				2,388
																									Other assets and liabilities		(170		)		4,983				13,383				(1,025		)		(5,352		)		11,819
																									Distributions received from subsidiaries		78,000				—				—				—				(78,000		)		—
																									Net cash provided by (used in) operating activities		24,329				13,311				135,486				(19,567		)		(72,842		)		80,717
																									Cash flows from investing activities:
																									Additions to property, plant and equipment		(771		)		(790		)		(27,030		)		—				—				(28,591		)
																									Change in restricted investments and bond collateral and reclamation deposits		49				(8		)		1,393				—				—				1,434
																									Net proceeds from sales of assets		—				—				902				—				—				902
																									Proceeds from the sale of restricted investments		—				—				8,287				—				—				8,287
																									Receivable from customer for property and equipment purchases		—				—				(389		)		—				—				(389		)
																									Other		—				—				(3,540		)		—				—				(3,540		)
																									Net cash provided by (used in) investing activities		(722		)		(798		)		(20,377		)		—				—				(21,897		)
																									Cash flows from financing activities:
																									Change in book overdrafts		—				—				310				—				—				310
																									Repayments of long-term debt		(500		)		—				(27,588		)		—				—				(28,088		)
																									Borrowings on revolving lines of credit		—				—				7,000				—				—				7,000
																									Repayments on revolving lines of credit		—				—				(7,000		)		—				—				(7,000		)
																									Debt issuance costs and other refinancing costs		(26		)		—				(156		)		—				—				(182		)
																									Dividends/distributions		(1,360		)		(14,500		)		(63,500		)		—				78,000				(1,360		)
																									Transactions with Parent/affiliates		(11,231		)		783				(6,960		)		22,566				(5,158		)		—
																									Net cash provided by (used in) financing activities		(13,117		)		(13,717		)		(97,894		)		22,566				72,842				(29,320		)
																									Net increase (decrease) in cash and cash equivalents		10,490				(1,204		)		17,215				2,999				—				29,500
																									Cash and cash equivalents, beginning of year		14,836				4,545				10,236				1,993				—				31,610
																									Cash and cash equivalents, end of year		$	25,326			$	3,341			$	27,451			$	4,992			$	—			$	61,110
																									CONSOLIDATING STATEMENTS OF CASH FLOWS
																									Year Ended December 31, 2012
																									(In thousands)
																									Statements of Cash Flows		Parent/				Co-Issuer				Guarantor				Non-Guarantor				Consolidating				Total
																											Issuer								Subsidiaries				Subsidiaries				Adjustments
																									Cash flows from operating activities:
																									Net income (loss)		$	(13,662	)		$	8,113			$	44,805			$	(7,503	)		$	(45,415	)		$	(13,662	)
																									Adjustments to reconcile net income (loss) to net cash provided by operating activities:
																									Equity in income of subsidiaries		(49,834		)		—				—				—				49,834				—
																									Depreciation, depletion, and amortization		421				10,085				46,639				—				—				57,145
																									Accretion of asset retirement obligation and receivable		—				59				12,130				—				—				12,189
																									Amortization of intangible assets and liabilities, net		—				622				36				—				—				658
																									Share-based compensation		3,054				44				2,942				—				—				6,040
																									Loss (gain) on sale of assets		13				—				515				—				—				528
																									Amortization of deferred financing costs		2,889				—				1,469				—				—				4,358
																									Loss on extinguishment of debt		1,986				—				—				—				—				1,986
																									Gain on sales of investments		(190		)		—				25				—				—				(165		)
																									Changes in operating assets and liabilities:
																									Receivables, net		(280		)		(151		)		(22,246		)		1,865				7,957				(12,855		)
																									Inventories		—				709				(2,873		)		—				—				(2,164		)
																									Excess of black lung benefit obligation over trust assets		1,791				—				—				—				—				1,791
																									Accounts payable and accrued expenses		4,792				(3,208		)		18,551				5,488				(8,224		)		17,399
																									Deferred revenue		—				(8,312		)		114				—				—				(8,198		)
																									Accrual for workers’ compensation		(2,096		)		—				—				—				—				(2,096		)
																									Asset retirement obligations		—				—				(6,943		)		—				—				(6,943		)
																									Accrual for postretirement medical benefits		(524		)		—				6,828				(113		)		—				6,191
																									Pension and SERP obligations		1,286				15				1,602				(101		)		—				2,802
																									Other assets and liabilities		(247		)		(536		)		(7,185		)		(1,892		)		2,000				(7,860		)
																									Distributions received from subsidiaries		31,971				—				—				—				(31,971		)		—
																									Net cash provided by (used in) operating activities		(18,630		)		7,440				96,409				(2,256		)		(25,819		)		57,144
																									Cash flows from investing activities:
																									Additions to property, plant and equipment		(159		)		(2,067		)		(18,806		)		—				—				(21,032		)
																									Change in restricted investments and bond collateral and reclamation deposits		(3,248		)		(7		)		(30,637		)		—				—				(33,892		)
																									Cash payments related to acquisitions and other		4,000				—				(76,522		)		—				—				(72,522		)
																									Net proceeds from sales of assets		—				—				480				—				—				480
																									Proceeds from the sale of restricted investments		1,581				—				2,525				—				—				4,106
																									Receivable from customer for property and equipment purchases		—				—				(674		)		—				—				(674		)
																									Net cash provided by (used in) investing activities		2,174				(2,074		)		(123,634		)		—				—				(123,534		)
																									Cash flows from financing activities:
																									Change in book overdrafts		—				(259		)		6				—				—				(253		)
																									Borrowings from long-term debt		119,364				—				—				—				—				119,364
																									Repayments of long-term debt		(23,000		)		—				(21,846		)		—				—				(44,846		)
																									Borrowings on revolving lines of credit		—				—				16,500				—				—				16,500
																									Repayments on revolving lines of credit		—				—				(16,500		)		—				—				(16,500		)
																									Debt issuance costs and other refinancing costs		(5,666		)		—				(22		)		—				—				(5,688		)
																									Dividends/distributions		(1,360		)		(1,050		)		(30,921		)		—				31,971				(1,360		)
																									Transactions with Parent/affiliates		(84,186		)		482				86,863				2,993				(6,152		)		—
																									Net cash provided by (used in) financing activities		5,152				(827		)		34,080				2,993				25,819				67,217
																									Net increase (decrease) in cash and cash equivalents		(11,304		)		4,539				6,855				737				—				827
																									Cash and cash equivalents, beginning of year		26,140				6				3,381				1,256				—				30,783
																									Cash and cash equivalents, end of year		$	14,836			$	4,545			$	10,236			$	1,993			$	—			$	31,610
																									CONSOLIDATING STATEMENTS OF CASH FLOWS
																									Year Ended December 31, 2011
																									(In thousands)
																									Statements of Cash Flows		Parent/				Co-Issuer				Guarantor				Non-Guarantor				Consolidating				Total
																											Issuer								Subsidiaries				Subsidiaries				Adjustments
																									Cash flows from operating activities:
																									Net loss		$	(36,875	)		$	5,089			$	15,186			$	(4,029	)		$	(16,246	)		$	(36,875	)
																									Adjustments to reconcile net loss to net cash provided by operating activities:
																									Equity in income of subsidiaries		(21,128		)		—				—				—				21,128				—
																									Depreciation, depletion, and amortization		306				10,175				35,113				—				—				45,594
																									Accretion of asset retirement obligation and receivable		—				55				10,823				—				—				10,878
																									Amortization of intangible assets and liabilities, net		—				621				36				—				—				657
																									Share-based compensation		1,670				32				3,019				—				—				4,721
																									Loss (gain) on sale of assets		3				189				448				—				—				640
																									Amortization of deferred financing costs		1,485				(21		)		1,051				—				—				2,515
																									Loss on extinguishment of debt		7,873				9,073				84				—				—				17,030
																									Gain on sales of investments		—				—				(150		)		—				—				(150		)
																									Loss on derivative instruments		3,079				—				—				—				—				3,079
																									Changes in operating assets and liabilities:
																									Receivables, net		(270		)		1,479				1,367				(3,334		)		6,249				5,491
																									Inventories		—				(1,820		)		(305		)		—				—				(2,125		)
																									Excess of black lung benefit obligation over trust assets		4,319				—				—				—				—				4,319
																									Accounts payable and accrued expenses		5,944				(1,063		)		(940		)		4,326				(4,139		)		4,128
																									Deferred revenue		—				(8,774		)		(1,144		)		—				—				(9,918		)
																									Accrual for workers’ compensation		1,248				—				—				—				—				1,248
																									Asset retirement obligations		—				—				(6,510		)		—				—				(6,510		)
																									Accrual for postretirement medical benefits		(2,879		)		—				1,132				104				—				(1,643		)
																									Pension and SERP obligations		(3,741		)		(50		)		2,520				(7		)		—				(1,278		)
																									Other assets and liabilities		444				(530		)		3,405				42				(427		)		2,934
																									Distributions received from subsidiaries		23,400				—				—				—				(23,400		)		—
																									Net cash provided by (used in) operating activities		(15,122		)		14,455				65,135				(2,898		)		(16,835		)		44,735
																									Cash flows from investing activities:
																									Additions to property, plant and equipment		(797		)		(2,119		)		(24,678		)		—				—				(27,594		)
																									Change in restricted investments and bond collateral and reclamation deposits		(1,713		)		2,580				(6,853		)		—				—				(5,986		)
																									Cash payments related to acquisitions and other		(4,000		)		—				—				—				—				(4,000		)
																									Net proceeds from sales of assets		—				—				687				—				—				687
																									Proceeds from the sale of investments		—				—				3,350				—				—				3,350
																									Receivable from customer for property and equipment purchases		—				—				(96		)		—				—				(96		)
																									Net cash provided by (used in) investing activities		(6,510		)		461				(27,590		)		—				—				(33,639		)
																									Cash flows from financing activities:
																									Change in book overdrafts		(146		)		259				(837		)		—				—				(724		)
																									Borrowings from long-term debt		142,500				—				—				—				—				142,500
																									Repayments of long-term debt		(2,532		)		(46,220		)		(24,814		)		—				—				(73,566		)
																									Borrowings on revolving lines of credit		—				1,500				85,700				—				—				87,200
																									Repayments on revolving lines of credit		—				(1,500		)		(104,100		)		—				—				(105,600		)
																									Debt issuance costs		(6,042		)		(9,077		)		100				—				—				(15,019		)
																									Exercise of stock options		422				—				—				—				—				422
																									Dividends/distributions		(21,301		)		(10,700		)		(11,700		)		(1,000		)		23,400				(21,301		)
																									Transactions with Parent/affiliates		(65,400		)		49,948				21,135				882				(6,565		)		—
																									Net cash provided by (used in) financing activities		47,501				(15,790		)		(34,516		)		(118		)		16,835				13,912
																									Net increase (decrease) in cash and cash equivalents		25,869				(874		)		3,029				(3,016		)		—				25,008
																									Cash and cash equivalents, beginning of year		271				880				352				4,272				—				5,775
																									Cash and cash equivalents, end of year		$	26,140			$	6			$	3,381			$	1,256			$	—			$	30,783

SUBSEQUENT_EVENT

SUBSEQUENT EVENT	12 Months Ended
	Dec. 31, 2013
Subsequent Events [Abstract]	'
SUBSEQUENT EVENT	'
	SUBSEQUENT EVENT
	On February 7, 2014, the Company closed on a private offering of $425 million in aggregate principal amount of 10.75% Senior Secured Notes due 2018 at a price of 106.875% plus accrued interest from February 1, 2014. The proceeds from the offering will be used primarily to pay the purchase price and related expenses for the Sherritt Acquisition (See Note 1 for additional details of the Sherritt Acquisition), to prepay the outstanding senior secured notes issued of WML (See Note 5 for additional details of the WML debt), and for working capital. The proceeds will be held in escrow pending the completion of the Sherritt Acquisition, which is expected to occur by the end of the first quarter of 2014.

SUMMARY_OF_SIGNIFICANT_ACCOUNT1

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Policies)	12 Months Ended
	Dec. 31, 2013
Accounting Policies [Abstract]	'
Consolidation Policy	'
	The Consolidated Financial Statements of Westmoreland Coal Company include the accounts of the Company and its controlled subsidiaries. The Company consolidates any variable interest entity, or VIE, for which the Company is considered the primary beneficiary. The Company provides for noncontrolling interests in consolidated subsidiaries, in which the Company’s ownership is less than 100 percent. All intercompany accounts and transactions have been eliminated.
	A VIE is an entity that is unable to make significant decisions about its activities or does not have the obligation to absorb losses or the right to receive returns generated by its operations. If the entity meets one of these characteristics, then the Company must determine if it is the primary beneficiary of the VIE. The party exposed to the majority of the risks and rewards with the VIE is the primary beneficiary and must consolidate the entity.
	The Company has determined for all periods presented, it was the primary beneficiary in Absaloka Coal LLC, a VIE, in which it held less than a 50% ownership through December 31, 2013. As a result, the Company has consolidated this entity within the coal segment. The investment in Absaloka Coal LLC by its outside partner did not continue after December 31, 2013, and beginning in 2014, Absaloka Coal LLC will be 100% owned by the Company, but will cease to have operations. As a result, the Company has unwound the transaction as of December 31, 2013 and concerning our balance sheet have decreased Other liabilities by $19.1 million and decreased Noncontrolling interest by $18.1 million. As a result, as of December 31, 2013, the noncontrolling interest was eliminated.
Use of Estimates	'
	The preparation of financial statements in conformity with generally accepted accounting principles requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosures of contingent assets and liabilities at the date of the financial statements and reported amounts of revenues and expenses during the reporting period. Actual results could differ from those estimates.
Cash and Cash Equivalents	'
	Cash and cash equivalents are stated at cost, which approximate fair value. Cash equivalents consist of highly liquid investments with original maturities of three months or less.
Trade Receivables	'
	Trade receivables are recorded at the invoiced amount and do not bear interest. The Company evaluates the need for an allowance for doubtful accounts based on a review of collectability. The Company has determined that no allowance is necessary for trade receivables as of December 31, 2013 and 2012.
Inventories	'
	Inventories, which include materials and supplies as well as raw coal, are stated at the lower of cost or market. Cost is determined using the average cost method. Coal inventory costs include labor, supplies, equipment, operating overhead and other related costs.
Exploration and Mine Development	'
	Exploration expenditures are charged to Cost of sales as incurred, including costs related to drilling and study costs incurred to convert or upgrade mineral resources to reserves.
	At existing surface operations, additional pits may be added to increase production capacity in order to meet customer requirements. These expansions may require significant capital to purchase additional equipment, relocate equipment, build or improve existing haul roads and create the initial pre-production box cut to remove overburden for new pits at existing operations. If these pits operate in a separate and distinct area of the mine, the costs associated with initially uncovering coal for production are capitalized and amortized over the life of the developed pit consistent with coal industry practices. Once production has begun, mining costs are then expensed as incurred.
	Where new pits are routinely developed as part of a contiguous mining sequence, the Company expenses such costs as incurred. The development of a contiguous pit typically reflects the planned progression of an existing pit, thus maintaining production levels from the same mining area utilizing the same employee group and equipment.
Property, Plant and Equipment	'
	Property, plant and equipment are recorded at cost and includes long-term spare parts inventory. Expenditures that extend the useful lives of existing plant and equipment or increase productivity of the assets are capitalized. Maintenance and repair costs that do not extend the useful life or increase productivity of the asset are expensed as incurred. Coal reserves are recorded at cost, or at fair value originally in the case of acquired businesses.
	Coal reserves, mineral rights and mine development costs are depleted based upon estimated recoverable proven and probable reserves. Plant and equipment are depreciated on a straight-line basis over the assets’ estimated useful lives as follows:
		Years
	Buildings and improvements	15 to 30
	Machinery and equipment	3 to 36
	Long-term spare parts inventory begins depreciation when placed in service.
	The Company assesses the carrying value of its property, plant and equipment for impairment whenever events or changes in circumstances indicate that the carrying amount of an asset may not be recoverable. Recoverability is measured by comparing estimated undiscounted cash flows expected to be generated from such assets to their net book value. If net book value exceeds estimated cash flows, the asset is written down to fair value. When an asset is retired or sold, its cost and related accumulated depreciation and depletion are removed from the accounts. The difference between the net book value of the asset and proceeds on disposition is recorded as a gain or loss. Fully depreciated plant and equipment still in use is not eliminated from the accounts.
Reclamation Deposits and Contractual Third-Party Reclamation Receivables	'
	Certain of the Company’s customers have either agreed to reimburse the Company for reclamation expenditures as they are incurred or have pre-funded a portion of the expected reclamation costs. Amounts received from customers and held on deposit are recorded as reclamation deposits. Amounts that are reimbursable by customers are recorded as third-party reclamation receivables when the related reclamation obligation is recorded.
Financial Instruments	'
	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 instruments that contain features that qualify them as embedded derivatives. Except for derivatives that qualify for the normal purchase normal sale exception, all derivative financial instruments are recognized in the balance sheet at fair value. Changes in fair value are recognized in earnings if they are not eligible for hedge accounting or Accumulated other comprehensive income (loss) if they qualify for cash flow hedge accounting.
	Held-to-maturity financial instruments consist of non-derivative financial assets with fixed or determinable payments and a fixed term, which the Company has the ability and intent to hold until maturity, and, therefore, accounts for them as held-to-maturity securities. Held-to-maturity securities are recorded at amortized cost, adjusted for the amortization or accretion of premiums or discounts calculated on the effective interest method. Interest income is recognized when earned.
	The Company has securities classified as available-for-sale, which are recorded at fair value. The changes in fair values are recorded as unrealized gains (losses) as a component of Accumulated other comprehensive income (loss) in shareholders’ deficit.
	The Company reviews its securities routinely for other-than-temporary impairment. The primary factors used to determine if an impairment charge must be recorded because a decline in value of the security is other than temporary include (i) whether the fair value of the investment is significantly below its cost basis, (ii) the financial condition of the issuer of the security, (iii) the length of time that the cost of the security has exceeded its fair value and (iv) the Company’s intent and ability to retain the investment for a period of time sufficient to allow for any anticipated recovery in market value. Other-than-temporary impairments are recorded as a component of Other income (expense).
Fair Value	'
	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 a given measurement date. Valuation techniques used must maximize the use of observable inputs and minimize the use of unobservable inputs.
	Fair value hierarchy prioritizes the inputs to valuation techniques used to measure fair value and is defined as:
	•	Level 1, defined as observable inputs such as quoted prices in active markets for identical assets. Level 1 assets include available-for-sale equity securities generally valued based on independent third-party market prices.
	•	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 Company’s non-recurring fair value measurements include asset retirement obligations and the purchase price allocations for the fair value of assets and liabilities acquired through business combinations.
	The Company determines the estimated fair value of its asset retirement obligations by calculating the present value of estimated cash flows related to reclamation liabilities using level 3 inputs. The significant inputs used to calculate such liabilities includes estimates of costs to be incurred, the Company’s credit adjusted discount rate, inflation rates and estimated dates of reclamation. The asset retirement liability is accreted to its present value each period and the associated mineral rights are depleted using the units-of-production method.
	The fair value of assets and liabilities acquired through business combinations is calculated using a discounted-cash flow approach using level 3 inputs. Cash flow estimates require forecasts and assumptions for many years into the future for a variety of factors.
Intangible Assets and Liabilities	'
	Identifiable intangible assets or liabilities acquired in a business combination must be recognized and reported separately from goodwill. The Company has determined that its most significant acquired identifiable intangible assets and liabilities are related to sales and purchase agreements. Intangible assets result from more favorable market prices than contracted prices in sales and purchase agreements as measured during a business combination. Intangible liabilities result from less favorable market prices than contracted prices in sales and purchase agreements as measured during a business combination. The majority of these intangible assets and liabilities are amortized on a straight-line basis over the respective period of the sales and purchase agreements, while the remainder are amortized on a unit-of-production basis.
	Amortization of intangible assets recognized in Cost of sales was $1.7 million in 2013, 2012, and 2011. Amortization of intangible liabilities recognized in Revenues was $1.0 million in 2013, 2012, and 2011.
	The estimated aggregate amortization amounts from intangibles assets and liabilities for each of the next five years as of December 31, 2013 are as follows:
		Amortization
		Expense
		(Revenue)
		(In thousands)
	2014	$	17
	2015	(791		)
	2016	(953		)
	2017	(953		)
	2018	(953		)
Compensation Related Costs	'
	Workers’ Compensation Benefits
	The Company is self-insured for workers’ compensation claims incurred prior to 1996. The liabilities for workers’ compensation claims are actuarially determined estimates of the ultimate losses incurred based on the Company’s experience. Adjustments to the probable ultimate liabilities are made annually based on subsequent developments and experience and are included in operations at the time of the revised estimate.
	The Company insures its current employees through third-party insurance providers and state arrangements.
	Pneumoconiosis (Black Lung) Benefits
	The Company is self-insured for federal and state black lung benefits for former heritage employees and has established an independent trust to pay these benefits. The Company accounts for these benefits on the accrual basis. An independent actuary annually calculates the present value of the accumulated black lung obligation. The underfunded status in 2013 and 2012 of the Company’s obligation is included as Excess of black lung benefit obligation over trust assets in the accompanying consolidated balance sheets. Actuarial gains and losses are recognized in the period in which they arise.
	The Company insures its current represented employees through arrangements with its unions and its current non-represented employees are insured through third-party insurance providers.
	Postretirement Health Care Benefits
	The Company accrues the cost to provide the benefits over the employees’ period of active service for postretirement benefits other than pensions. These costs are determined on an actuarial basis. The Company’s consolidated balance sheet reflects the unfunded status of postretirement benefit obligations.
	Pension and SERP Plans
	The Company accrues the cost to provide the benefits over the employees’ period of active service for the non-contributory defined benefit pension and SERP plans it sponsors. These costs are determined on an actuarial basis. The Company’s consolidated balance sheet reflects the unfunded status of the defined benefit pension and SERP plans.
Deferred Revenue	'
	Deferred revenues represent funding received upon the negotiation of long-term contracts. The deferred revenues for coal will be recognized as deliveries of the reserved coal are made in accordance with the long-term coal contracts. Deferred power revenues are recognized on a pro rata basis, based on the payments estimated to be received over the remaining term of the power sales agreements.
Asset Retirement Obligations	'
	The Company’s asset retirement obligation, or ARO, liabilities primarily consist of estimated costs to reclaim surface land and support facilities at its mines and power plants in accordance with federal and state reclamation laws as established by each mining permit.
	The Company estimates its ARO liabilities for final reclamation and mine closure based upon detailed engineering calculations of the amount and timing of the future costs for a third party to perform the required work. These estimates are based on projected pit configurations at the end of mining and are escalated for inflation, and then discounted at a credit-adjusted risk-free rate. The Company records mineral rights associated with the initial recorded liability. Mineral rights are amortized based on the units of production method over the estimated recoverable, proven and probable reserves at the related mine, and the ARO liability is accreted to the projected settlement date. Changes in estimates could occur due to revisions of mine plans, changes in estimated costs, and changes in timing of the performance of reclamation activities.
Income Taxes	'
	Deferred income taxes are provided for temporary differences arising from differences between the financial statement amount and tax basis of assets and liabilities existing at each balance sheet date using enacted tax rates anticipated to be in effect when the related taxes are expected to be paid or recovered. A valuation allowance is established if it is more likely than not that a deferred tax asset will not be realized. In determining the need for a valuation allowance, the Company considers projected realization of tax benefits based on expected levels of future taxable income, available tax planning strategies and its overall deferred tax position.
	Accounting guidance prescribes a recognition threshold and measurement attribute for the financial statement recognition and measurement of a tax position taken or expected to be taken in a tax return. Under this guidance, a company can recognize the benefit of an income tax position only if it is more likely than not (greater than 50%) that the tax position will be sustained upon tax examination, based solely on the technical merits of the tax position. Guidance is also provided on the derecognition, classification, interest and penalties, accounting in interim periods, disclosure and transition.
	The Company includes interest and penalties related to income tax matters in Income tax expense.
	The tax effect of pretax income or loss from continuing operations is generally determined by a computation that does not consider the tax effects of items that are not included in continuing operations. The exception to that incremental approach is that all items (for example, items recorded in other comprehensive income, extraordinary items, and discontinued operations) be considered in determining the amount of tax benefit that results from a loss from continuing operations and that shall be allocated to continuing operations.
Deferred Financing Costs	'
	The Company capitalizes costs incurred in connection with borrowings or establishment of credit facilities and issuance of debt securities. These costs are amortized as an adjustment to interest expense over the life of the borrowing or term of the credit facility using the effective interest method. These amounts are recorded in Other assets in the accompanying consolidated balance sheets.
Revenue Recognition	'
	Coal Revenues
	The Company recognizes coal sales revenue at the time title passes to the customer in accordance with the terms of the underlying sales agreements and after any contingent performance obligations have been satisfied. Coal sales revenue is recognized based on the pricing contained in the contracts in place at the time that title passes.
	Power Revenues
	ROVA supplies power under long-term power sales agreements. Under these agreements, ROVA invoices and collects capacity payments based on kilowatt-hours produced if the units are dispatched or for the kilowatt-hours of available capacity if the units are not fully dispatched.
	A portion of the capacity payments under the agreements is considered to be an operating lease. The Company is recognizing amounts invoiced under the power sales agreements as revenue on a pro rata basis, based on the weighted average per kilowatt hour capacity payments estimated to be received over the remaining term of the power sales agreements. Under this method of recognizing revenue, $8.7 million and $8.3 million of previously deferred revenue was recognized during 2013 and 2012, respectively.
	On December 23, 2013, the Company entered into an agreement with Dominion Virginia Power, a subsidiary of Dominion, to restructure the remaining five years of the ROVA I and ROVA II contracts. From January 2014 through March 2019, the Company will keep ROVA ready to operate and expects to run the plants during high demand energy periods. The Company will additionally buy power from a power provider at a fixed price, and will supply Dominion that power. The Company can also operate the plant and sell power on the open market if it it chooses.
	The Company incurred restructuring charges of $5.1 million for the year ended December 31, 2013 primarily related to legal and consulting fees. The restructuring plan is expected to be complete by March 31, 2014. The Company expects that the aggregate $5.1 million of expenditures will be cash expenditures paid out in the first quarter of 2014.
	The table below represents the restructuring provision activity during the year ended December 31, 2013 (in millions):
	Beginning Balance				Restructuring Charges			Restructuring Payments		Ending Balance
	$	—			$	5.1		$	—	$	5.1
	Other Operating Income (Loss)
	Other operating income in the accompanying Consolidated Results of Operations reflects income from sources other than coal or power revenues. Income from the Company’s Indian Coal Tax Credit monetization transaction is recorded as Other operating income. The Company recognizes income as business interruption losses are incurred and reimbursement is virtually assured and has recognized $16.2 million and $17.3 million of income during 2013 and 2012, respectively; which is included in Other operating income. Insurance proceeds are included in Net cash provided by operating activities.
Share-Based Compensation	'
	Share-based compensation expense is generally measured at the grant date and recognized as expense over the vesting period of the entire award. These costs are recorded in Cost of sales and Selling and administrative expenses in the accompanying consolidated results of operations.
Earnings (Loss) per Share	'
	Basic earnings (loss) per share have 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 convertible notes, stock options, stock appreciation rights, restricted stock and warrants. No such items were included in the computation of diluted loss per share for the years ended 2013, 2012 or 2011 because the Company incurred a loss from operations in each of these periods and the effect of inclusion would have been anti-dilutive.
	The table below shows the number of shares that were excluded from the calculation of diluted loss per share because their inclusion would be anti-dilutive to the calculation:
		Years Ended December 31,
		2013			2012		2011
		(In thousands)
	Convertible notes and securities	1,093			1,093		1,093
	Restricted stock units, stock options, and SARs	805			978		634
	Total shares excluded from diluted shares calculation	1,898			2,071		1,727
Recently Adopted Accounting Pronouncements	'
	Effective January 1, 2013, the Company adopted an accounting standards update which requires that companies present either in a single note or parenthetically on the face of the financial statements, the effect of significant amounts reclassified from each component of accumulated other comprehensive income based on its source and the income statement line items affected by the reclassification. If a component is not required to be reclassified to net income in its entirety, companies would instead cross reference to the related footnote for additional information. This accounting standards update only affects the Company's disclosures.

SUMMARY_OF_SIGNIFICANT_ACCOUNT2

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Tables)	3 Months Ended								12 Months Ended
	Mar. 31, 2014								Dec. 31, 2013
Accounting Policies [Abstract]	'								'
Estimated useful lives of plant and equipment	'								'
									Plant and equipment are depreciated on a straight-line basis over the assets’ estimated useful lives as follows:
										Years
									Buildings and improvements	15 to 30
									Machinery and equipment	3 to 36
Estimated aggregate amortization expense related to intangibles	'								'
									The estimated aggregate amortization amounts from intangibles assets and liabilities for each of the next five years as of December 31, 2013 are as follows:
										Amortization
										Expense
										(Revenue)
										(In thousands)
									2014	$	17
									2015	(791		)
									2016	(953		)
									2017	(953		)
									2018	(953		)
Restructuring reserve	'								'
	The table below represents the restructuring provision activity during the three months ended March 31, 2014 (in millions):								The table below represents the restructuring provision activity during the year ended December 31, 2013 (in millions):
	Beginning Balance		Restructuring Charges		Restructuring Payments		Ending Balance		Beginning Balance				Restructuring Charges			Restructuring Payments		Ending Balance
	$	5.1	$	0.4	$	0.4	$	5.1	$	—			$	5.1		$	—	$	5.1
Anti-dilutive securities excluded from the calculation of earnings (loss) 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:								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,								Years Ended December 31,
		2014	2013							2013			2012		2011
		(In thousands)								(In thousands)
	Convertible securities	828	1,093						Convertible notes and securities	1,093			1,093		1,093
	Restricted stock units, stock options and SARs	779	978						Restricted stock units, stock options, and SARs	805			978		634
	Total shares excluded from diluted shares calculation	1,607	2,071						Total shares excluded from diluted shares calculation	1,898			2,071		1,727

ACQUISITION_Tables

ACQUISITION (Tables)	12 Months Ended
	Dec. 31, 2013
Business Combinations [Abstract]	'
Summary of purchase consideration and allocation of purchase consideration	'
	A summary of the purchase consideration and allocation of the purchase consideration follow (in millions):
		Final as of
		December 31,
		2012
	Purchase consideration:
	Cash paid	$	76.5
	Fair value of liabilities assumed:
	Postretirement medical cost obligations	49.2
	Asset retirement obligations	19.4
	Pension obligations	15.6
	Deferred revenue	2.2
	Accrued liabilities	1.6
	Total fair value of liabilities assumed	88
	Total purchase consideration	$	164.5
	Allocation of purchase consideration:
	Inventories	$	9.6
	Land and mineral rights	65.5
	Plant and equipment	89.4
	Total	$	164.5
Summary of pro forma information	'
	The following unaudited pro forma information has been prepared for illustrative purposes only and assumes the acquisition occurred on January 1, 2011. 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 acquisition occurred on January 1, 2011, or of future results of operations.
		Years Ended
		31-Dec-12			31-Dec-11
		(In thousands)
	Total Revenues
	As reported	$	600,437		$	501,713
	Pro forma	$	614,550		$	645,595
	Operating Income
	As reported	$	28,872		$	10,626
	Pro forma	$	31,146		$	13,275
	Net income (loss) applicable to common shareholders
	As reported	$	(8,586	)	$	(34,460	)
	Pro forma	$	(7,524	)	$	(46,260	)
	Net income (loss) per share applicable to common shareholders
	As reported	$	(0.61	)	$	(2.61	)
	Pro forma	$	(0.54	)	$	(3.51	)

INVENTORIES_Tables

INVENTORIES (Tables)	3 Months Ended							12 Months Ended
	Mar. 31, 2014							Dec. 31, 2013
Inventory Disclosure [Abstract]	'							'
Inventories	'							'
	Inventories consisted of the following:							Inventories consisted of the following:
		March 31, 2014			December 31, 2013				December 31,
		(In thousands)							2013			2012
	Coal stockpiles	$	1,189		$	543			(In thousands)
								Coal stockpiles	$	543		$	989
	Coal fuel inventories	1,844			6,161
								Coal fuel inventories	6,161			3,048
	Materials and supplies	33,189			34,233
								Materials and supplies	34,233			34,954
	Reserve for obsolete inventory	(775		)	(965		)
	Total	$	35,447		$	39,972		Reserve for obsolete inventory	(965		)	(1,257		)
								Total	$	39,972		$	37,734

RESTRICTED_INVESTMENTS_AND_BON1

RESTRICTED INVESTMENTS AND BOND COLLATERAL (Tables)	3 Months Ended							12 Months Ended
	Mar. 31, 2014							Dec. 31, 2013
Disclosure Restricted Investments and Bond Collateral [Abstract]	'							'
Components of restricted investments and bond collateral	'							'
	The Company’s restricted investments and bond collateral consist of the following:							The Company’s restricted investments and bond collateral consist of the following:
		March 31, 2014			31-Dec-13				December 31,
		(In thousands)							2013			2012
	Coal Segment:								(In thousands)
	WML debt reserve account	$	13,068		$	13,067		Coal Segment:
								WML debt reserve account	$	13,067		$	13,062
	Reclamation bond collateral:
	Kemmerer Mine	24,944			24,966			Reclamation bond collateral:
								Kemmerer Mine	24,966			24,702
	Absaloka Mine	11,670			11,653
								Absaloka Mine	11,653			14,507
	Rosebud Mine	3,145			3,145
								Rosebud Mine	3,145			12,495
	Beulah Mine	1,270			1,270
								Beulah Mine	1,270			1,270
	Power Segment:
	Letter of credit account	—			5,998			Power Segment:
								Letter of credit account	5,998			5,990
	Corporate Segment:
	Proceeds from the New Notes held in escrow	454,219			—			Corporate Segment:
								Postretirement medical benefit bonds	8,467			8,593
	Other requirements for Sherritt Acquisition held in escrow	16,900			—
								Workers’ compensation bonds	6,667			6,590
	Postretirement medical benefit bonds	8,481			8,467
								Total restricted investments and bond collateral	75,233			87,209
	Workers’ compensation bonds	6,686			6,667
								Less current portion	(5,998		)	—
	Total restricted investments and bond collateral	540,383			75,233
								Total restricted investments and bond collateral, less current portion	$	69,235		$	87,209
	Less current portion	(16,900		)	(5,998		)
	Total restricted investments and bond collateral, less current portion	$	523,483		$	69,235
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 and bond collateral at March 31, 2014 are as follows:							The Company’s carrying value and estimated fair value of its restricted investments and bond collateral at December 31, 2013 are as follows:
		Carrying Value			Fair Value				Carrying Value			Fair Value
		(In thousands)							(In thousands)
	Cash and cash equivalents	$	503,391		$	503,391		Cash and cash equivalents	$	40,605		$	40,605
	Time deposits	2,444			2,444			Time deposits	2,444			2,444
	Held-to-maturity securities	34,548			34,707			Held-to-maturity securities	32,184			32,046
		$	540,383		$	540,542			$	75,233		$	75,095
Amortized cost, gross unrealized holding gains and losses and fair value of held-to-maturity securities	'							'
	The amortized cost, gross unrealized holding gains and fair value of held-to-maturity securities at March 31, 2014 is as follows (in thousands):							The amortized cost, gross unrealized holding gains and losses and fair value of held-to-maturity securities are as follows:
	Amortized cost	$	34,548						December 31,
									2013			2012
	Gross unrealized holding gains	440							(In thousands)
								Amortized cost	$	32,184		$	3,983
	Gross unrealized holding losses	(281		)
	Fair value	$	34,707					Gross unrealized holding gains	309			356
								Gross unrealized holding losses	(447		)	—
								Fair value	$	32,046		$	4,339
								The amortized cost, gross unrealized holding gains and losses and fair value of held-to-maturity securities are as follows:
									Years Ended December 31,
									2013			2012
									(In thousands)
								Amortized cost	$	11,396		$	19,832
								Gross unrealized holding gains	764			1,190
								Gross unrealized holding losses	(74		)	(9		)
								Fair value	$	12,086		$	21,013
Maturities of held-to-maturity securities	'							'
	Maturities of held-to-maturity securities are as follows at March 31, 2014:							Maturities of held-to-maturity securities are as follows at December 31, 2013:
		Amortized Cost			Fair Value				Amortized Cost			Fair Value
		(In thousands)							(In thousands)
	Due within one year	$	1,193		$	1,217		Due within one year	$	1,111		$	1,143
	Due in five years or less	19,539			19,752			Due in five years or less	17,839			17,944
	Due after five years to ten years	6,718			6,717			Due after five years to ten years	6,769			6,665
	Due in more than ten years	7,098			7,021			Due in more than ten years	6,465			6,294
		$	34,548		$	34,707			$	32,184		$	32,046
	Maturities of held-to-maturity securities are as follows at March 31, 2014:							Maturities of held-to-maturity securities are as follows at December 31, 2013:
		Amortized Cost			Fair Value				Amortized Cost			Fair Value
		(In thousands)							(In thousands)
	Within one year	$	479		$	468		Within one year	$	17		$	17
	Due in five years or less	17,562			17,880			Due in five years or less	6,645			6,976
	Due after five years to ten years	4,869			5,023			Due after five years to ten years	3,002			3,123
	Due in more than ten years	2,778			3,030			Due in more than ten years	1,732			1,970
		$	25,688		$	26,401			$	11,396		$	12,086
Cost basis, gross unrealized holding gains and fair value of available-for-sale securities	'							'
								The cost basis, gross unrealized holding gains and fair value of available-for-sale securities are as follows:
									December 31,
									2013			2012
									(In thousands)
								Cost basis	$	—		$	175
								Gross unrealized holding gains	—			16
								Fair value	$	—		$	191

LINES_OF_CREDIT_AND_LONGTERM_D1

LINES OF CREDIT AND LONG-TERM DEBT (Tables)	3 Months Ended							12 Months Ended
	Mar. 31, 2014							Dec. 31, 2013
Debt Instrument [Line Items]	'							'
Outstanding lines of credit and long-term debt	'							'
	The amounts outstanding under the Company’s long-term debt consisted of the following as of the dates indicated:							The amounts outstanding under the Company’s long-term debt consisted of the following as of the dates indicated:
		Total Debt Outstanding							Total Debt Outstanding
		March 31, 2014			December 31, 2013				December 31,
		(In thousands)							2013			2012
	10.75% Senior Notes due 2018	$	251,500		$	251,500			(In thousands)
								10.75% senior notes due 2018	$	251,500		$	252,000
	New Notes - 10.75% senior notes due 2018	425,000			—
								WML term debt due 2018	85,500			103,500
	8.02% WML term debt due 2018	81,000			85,500
								Capital lease obligations	10,153			13,926
	Capital lease obligations	21,465			10,153
								Other	1,209			1,654
	Other	1,093			1,209
								Debt discount	(8,525		)	(10,091		)
	Debt premium (discount), net	20,173			(8,525		)	Total debt outstanding	339,837			360,989
	Total debt outstanding	800,231			339,837			Less current portion	(44,343		)	(23,791		)
								Total debt outstanding, less current portion	$	295,494		$	337,198
	Less current installments	(48,586		)	(44,343		)
	Total debt outstanding, less current installments	$	751,645		$	295,494
Aggregate contractual debt maturities of all long-term debt and lines of credit	'							'
	The following table presents aggregate contractual debt maturities of all long-term debt:							The following table presents aggregate contractual debt maturities of all long-term debt:
		As of March 31, 2014							As of December 31, 2013
		(In thousands)							(In thousands)
	2014	$	19,569					2014	$	23,949
	2015	24,710						2015	22,662
	2016	24,055						2016	21,943
	2017	24,664						2017	22,492
	2018	684,556						2018	257,316
	Thereafter	2,504						Thereafter	—
	Total	780,058						Total	348,362
	Plus: debt premium (discount), net	20,173						Less: debt discount	(8,525		)
								Total debt	$	339,837
	Total debt	$	800,231
Term Debt [Member]	'							'
Debt Instrument [Line Items]	'							'
Aggregate contractual debt maturities of all long-term debt and lines of credit	'							'
								The term debt bears interest at 8.02% per annum, payable quarterly. The principal payments required for the term debt are as follows:
									(In millions)
								2014	$	18
								2015	20
								2016	20
								2017	22
								2018	5.5
								Thereafter	—

POSTRETIREMENT_MEDICAL_BENEFIT1

POSTRETIREMENT MEDICAL BENEFITS (Tables)	3 Months Ended					12 Months Ended
	Mar. 31, 2014					Dec. 31, 2013
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]	'					'
Schedule of contributions to Combined Benefit Fund	'					'
						The following payments were made to the CBF (in millions):
						2013	$	2.2
						2012	2.3
						2011	2.6
Schedule of Workers Compensation obligation	'					'
						The following table shows the changes in the Company’s workers’ compensation obligation:
							December 31,
							2013				2012
							(In thousands)
						Workers’ compensation, beginning of year (including current portion)	$	9,530			$	11,626
						Accretion	166				204
						Claims paid	(581		)		(475		)
						Actuarial changes	(1,654		)		(1,825		)
						Workers’ compensation, end of year	7,461				9,530
						Less current portion	(717		)		(820		)
						Workers’ compensation, less current portion	$	6,744			$	8,710
Postretirement Medical Benefits [Member]	'					'
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]	'					'
Schedule of benefit obligations and amounts recognized in financial statements	'					'
						The following table sets forth the actuarial present value of postretirement medical benefit obligations and amounts recognized in the Company’s financial statements:
							December 31,
							2013				2012
							(In thousands)
						Change in benefit obligations:
						Net benefit obligation at beginning of year	$	333,842			$	258,641
						Liability acquired	—				49,241
						Service cost	4,436				3,555
						Interest cost	12,139				12,363
						Plan participant contributions	132				129
						Actuarial loss (gain)	(53,230		)		22,342
						Gross benefits paid	(14,220		)		(13,544		)
						Federal subsidy on benefits paid	1,230				1,115
						Net benefit obligation at end of year	284,329				333,842
						Change in plan assets:
						Employer contributions	14,088				13,415
						Plan participant contributions	132				129
						Gross benefits paid	(14,220		)		(13,544		)
						Fair value of plan assets at end of year	—				—
						Unfunded status at end of year	$	(284,329	)		$	(333,842	)
						Amounts recognized in the balance sheet consist of:
						Current liabilities	$	(13,955	)		$	(14,068	)
						Noncurrent liabilities	(270,374		)		(319,775		)
						Accumulated other comprehensive loss	20,292				77,528
						Net amount recognized	$	(264,037	)		$	(256,315	)
						Amounts recognized in accumulated other comprehensive loss consists of:
						Net actuarial loss	$	26,012			$	83,884
						Prior service credit	(5,720		)		(6,356		)
							$	20,292			$	77,528
Schedule of amounts in Accumulated Other Comprehensive Income (Loss) to be recognized over next fiscal year	'					'
						The following amounts will be amortized from accumulated other comprehensive loss into net periodic benefit cost in 2014 (in millions):
						Actuarial loss	$	0.7
						Prior service credit	0.6
Components of net periodic benefit cost	'					'
	The components of net periodic postretirement medical benefit cost are as follows:					The components of net periodic postretirement medical benefit cost are as follows:
		Three Months Ended March 31,					Years Ended December 31,
		2014		2013			2013				2012			2011
		(In thousands)					(In thousands)
	Components of net periodic benefit cost:					Components of net periodic benefit cost:
	Service cost	$	822	$	1,109	Service cost	$	4,436			$	3,555		$	493
	Interest cost	3,203		3,035		Interest cost	12,139				12,363			10,510
	Amortization of deferred items	5		1,001		Amortization of:
						Transition obligation	—				93			93
	Total net periodic benefit cost	$	4,030	$	5,145
						Prior service credit	(636		)		(636		)	(636		)
	The following table shows the net periodic postretirement medical benefit costs that relate to current and former mining operations:					Actuarial loss	4,641				3,116			255
						Total net periodic benefit cost	$	20,580			$	18,491		$	10,715
		Three Months Ended March 31,
		2014		2013		The following table shows the net periodic postretirement medical benefit costs that relate to current and former mining operations:
		(In thousands)
	Former mining operations	$	2,403	$	3,119
							Years Ended December 31,
	Current operations	1,627		2,026			2013				2012			2011
							(In thousands)
	Total net periodic benefit cost	$	4,030	$	5,145	Former mining operations	$	12,475			$	11,314		$	9,259
						Current operations	8,105				7,177			1,456
						Total net periodic benefit cost	$	20,580			$	18,491		$	10,715
Schedule of weighted-average assumptions used	'					'
						The weighted-average assumptions used to determine net periodic benefit cost were as follows:
							December 31,
							2013		2012		2011
						Discount rate	3.60% - 4.15%		4.10%		5.15%
						Measurement date	31-Dec-12		31-Dec-11		31-Dec-10
						The weighted-average assumptions used to determine the benefit obligations as of the end of each year were as follows:
							December 31,
							2013		2012
						Discount rate	4.50% - 5.05%		3.60% - 4.15%
						Measurement date	December 31, 2013		December 31, 2012
Schedule of assumed health care trend rate	'					'
						The following presents information about the assumed health care trend rate:
							December 31,
							2013			2012
						Health care cost trend rate assumed for next year	6.75	%		7	%
						Rate to which the cost trend is assumed to decline (ultimate trend rate)	5	%		5	%
						Year that the trend rate reaches the ultimate trend rate	2021			2021
Schedule of effect of a one percent change on the health care cost trend	'					'
						The effect of a one percent change on the health care cost trend rate used to calculate periodic postretirement medical benefit costs and the related benefit obligation are summarized in the table below:
							Postretirement Medical Benefits
							1 % Increase				1 % Decrease
							(In thousands)
						Effect on service and interest cost components	$	3,148			$	(2,442	)
						Effect on postretirement medical benefit obligation	$	35,464			$	(30,096	)
Schedule of expected benefit payments	'					'
						The following benefit payments and Medicare D subsidy (which the Company receives as a benefit partially offsetting its prescription drug costs for retirees and their dependents) are expected by the Company:
							Postretirement				Medicare D			Net
							Medical  Benefits				Subsidy			Postretirement
														Medical Benefits
							(In thousands)
						2014	$	13,955			$	(1,249	)	$	12,706
						2015	14,522				(1,293		)	13,229
						2016	14,975				(1,336		)	13,639
						2017	15,408				(1,386		)	14,022
						2018	16,191				(1,432		)	14,759
						Years 2019 - 2023	85,342				(7,807		)	77,535
Pneumoconiosis (Black Lung) Benefits [Member]	'					'
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]	'					'
Schedule of net funded status	'					'
						The following table sets forth the funded status of the Company’s black lung obligation:
							December 31,
							2013				2012
							(In thousands)
						Actuarial present value of benefit obligation:
						Expected claims from terminated employees	$	876			$	1,139
						Amounts owed to existing claimants	13,267				15,061
						Total present value of benefit obligation	14,143				16,200
						Plan assets at fair value, primarily government-backed securities	5,468				7,844
						Excess of the black lung benefit obligation over trust assets	$	8,675			$	8,356
Schedule of allocation of plan assets	'					'
						The fair value of the Company’s Black Lung trust assets by asset category is as follows:
							31-Dec-13
											Quoted Prices			Significant
											in Active			Other
											Markets for			Observable
											Identical Assets			Inputs
							Fair Value				Level 1			Level 2
							(In thousands)
						U.S. treasury securities	$	5,280			$	—		$	5,280
						Mortgage-backed securities	185				—			185
						Cash and cash equivalents	3				3			—
							$	5,468			$	3		$	5,465
							31-Dec-12
											Quoted Prices			Significant
											in Active			Other
											Markets for			Observable
											Identical Assets			Inputs
							Fair Value				Level 1			Level 2
							(In thousands)
						U.S. treasury securities	$	7,548			$	—		$	7,548
						Mortgage-backed securities	269				—			269
						Cash and cash equivalents	27				27			—
							$	7,844			$	27		$	7,817

PENSION_AND_OTHER_SAVING_PLANS1

PENSION AND OTHER SAVING PLANS (Tables) (Pension Benefits [Member])	3 Months Ended							12 Months Ended
	Mar. 31, 2014							Dec. 31, 2013
Pension Benefits [Member]	'							'
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]	'							'
Schedule of benefit obligations and amounts recognized in financial statements	'							'
								The following table provides a reconciliation of the changes in the benefit obligations of the plans and the fair value of assets of the qualified plans and the amounts recognized in the Company’s financial statements for both the defined benefit pension and SERP plans:
									Defined Benefit Pension						SERP
									December 31,						December 31,
									2013			2012			2013			2012
									(In thousands)
								Change in benefit obligation:
								Net benefit obligation at beginning of year	$	172,289		$	100,582		$	4,241		$	4,511
								Liability acquired	—			57,307			—			—
								Service cost	2,346			2,139			—			—
								Interest cost	6,209			6,330			152			172
								Actuarial loss (gain)	(18,972		)	13,121			(359		)	(48		)
								Benefits and expenses paid	(6,797		)	(7,190		)	(394		)	(394		)
								Net benefit obligation at end of year	155,075			172,289			3,640			4,241
								Change in plan assets:
								Fair value of plan assets at the beginning of year	121,887			75,710			—			—
								Assets acquired	—			41,704			—			—
								Actual return on plan assets	18,414			11,502			—			—
								Employer contributions	645			161			394			394
								Benefits and expenses paid	(6,797		)	(7,190		)	(394		)	(394		)
								Fair value of plan assets at end of year	134,149			121,887			—			—
								Unfunded status at end of year	$	(20,926	)	$	(50,402	)	$	(3,640	)	$	(4,241	)
								Amounts recognized in the accompanying balance sheet consist of:
								Current liability	$	—		$	—		$	(390	)	$	(390	)
								Noncurrent liability	(20,926		)	(50,401		)	(3,250		)	(3,850		)
								Accumulated other comprehensive loss	11,045			43,037			1,209			1,679
								Net amount recognized at end of year	$	(9,881	)	$	(7,364	)	$	(2,431	)	$	(2,561	)
								Amounts recognized in accumulated other comprehensive loss consist of:
								Net actuarial loss	$	11,045		$	43,037		$	1,209		$	1,679
									$	11,045		$	43,037		$	1,209		$	1,679
Schedule of amounts in Accumulated Other Comprehensive Income (Loss) to be recognized over next fiscal year	'							'
								The following amounts will be amortized from accumulated other comprehensive loss into net periodic benefit cost in 2014 (in millions):
									Pension			SERP
								Net actuarial loss	$	0.8		$	0.1
Components of net periodic benefit cost	'							'
	The Company incurred net periodic benefit costs of providing these pension benefits as follows:							The components of net periodic benefit cost are as follows:
		Three Months Ended March 31,							Defined Benefit Pension									SERP
		2014			2013				Years Ended December 31,									Years Ended December 31,
		(In thousands)							2013			2012			2011			2013			2012		2011
	Components of net periodic benefit cost:								(In thousands)
	Service cost	$	500		$	534		Components of net periodic benefit cost:
								Service cost	$	2,346		$	2,139		$	784		$	—		$	—	$	—
	Interest cost	1,747			1,625
								Interest cost	6,209			6,330			4,568			152			172		215
	Expected return on plan assets	(2,154		)	(2,060		)
	Amortization of deferred items	359			741			Expected return on plan assets	(8,770		)	(8,241		)	(5,218		)	—			—		—
	Total net periodic pension cost	$	452		$	840		Amortization of:
								Prior service cost	—			—			—			—			—		5
								Actuarial loss	3,377			2,867			1,578			112			95		64
								Total net periodic pension cost	$	3,162		$	3,095		$	1,712		$	264		$	267	$	284
Schedule of weighted-average assumptions used	'							'
								The following table provides the assumptions used to determine net periodic benefit cost:
									Defined Benefit Pension					SERP
									Years Ended December 31,					Years Ended December 31,
									2013		2012	2011		2013	2012		2011
								Discount rate	3.35% - 3.75%		4.05% - 4.25%	5.15% - 5.40%		3.75%	4.25%		5.40%
								Expected return on plan assets	7.40%		7.40%	7.40%		N/A	N/A		N/A
								Rate of compensation increase	N/A		N/A	N/A		N/A	N/A		N/A
								Measurement date	31-Dec-12		December 31,	December 31,		31-Dec-12	December 31,		December 31,
											2011	2010			2011		2010
								The weighted-average assumptions used to determine the benefit obligations as of the end of each year were as follows:
									Defined Benefit Pension			SERP
									December 31,			December 31,
									2013		2012	2013		2012
								Discount rate	4.25% - 4.65%		3.35% - 3.75%	4.65%		3.75%
								Measurement date	31-Dec-13		December 31, 2012	31-Dec-13		December 31, 2012
Schedule of allocation of plan assets	'							'
								The weighted-average target asset allocation of the Company’s pension trusts were as follows at December 31, 2013:
									Target Allocation
								Asset category
								Cash and equivalents	0% - 10%
								Equity securities funds	20% - 60%
								Debt securities funds	40% - 80%
								Other	0% - 10%
								The fair value of the Company’s pension plan assets by asset category is as follows:
									31-Dec-13
												Quoted			Significant			Significant
												Prices in			Other			Unobservable
												Active			Observable			Inputs
												Markets for			Inputs
												Identical
												Assets
									Fair Value			Level 1			Level 2			Level 3
									(In thousands)
								Pooled separate accounts:
								Large-cap	$	48,983		$	—		$	48,983		$	—
								International blend	18,191			—			18,191			—
								Fixed income domestic	40,944			—			40,944			—
								Fixed income long term	17,797			—			17,797			—
								Stable Value	5,267			—			5,267			—
								Registered investment companies – growth fund	—			—			—			—
								Limited partnerships and limited liability companies	250			—			—			250
								Westmoreland Coal common stock	2,255			2,255			—			—
								Cash and cash equivalents	462			462			—			—
									$	134,149		$	2,717		$	131,182		$	250
									31-Dec-12
												Quoted			Significant			Significant
												Prices in			Other			Unobservable
												Active			Observable			Inputs
												Markets for			Inputs
												Identical
												Assets
									Fair Value			Level 1			Level 2			Level 3
									(In thousands)
								Pooled separate accounts:
								Large-cap	$	50,589		$	—		$	50,589		$	—
								International blend	10,294			—			10,294			—
								Fixed income domestic	42,744			—			42,744			—
								Stable value	3,850			—			3,850			—
								Registered investment companies – growth fund	10,295			10,295			—			—
								Limited partnerships and limited liability companies	614			—			—			614
								Westmoreland Coal common stock	3,500			3,500			—			—
								Cash and cash equivalents	1			1			—			—
									$	121,887		$	13,796		$	107,477		$	614
Schedule of changes in fair value of plan assets	'							'
								A summary of changes in the fair value of the Plan’s Level 3 assets is shown below:
									Limited partnerships and limited
									liability companies
									Year Ended December 31,
									2013			2012
									(In thousands)
								Beginning balance	$	614		$	1,050
								Unrealized gain	5			96
								Settlements, net	(369		)	(532		)
								Ending balance	$	250		$	614
Schedule of expected benefit payments	'							'
								The following benefit payments are expected to be paid from its pension plan assets:
									Pension Benefits
									(In thousands)
								2014	$	7,324
								2015	7,772
								2016	8,238
								2017	9,066
								2018	9,321
								Years 2019 - 2023	50,340
Schedule of multiemployer plans	'							'
								The following table shows required information for each employer contributing to the Central Pension Fund:
									WECO			WRI			WSC
								Employer plan number	9313			9243			4990
								Minimum contributions per hour worked	$	5.75		$	5.7		$2.95 - $3.20
								Expiration date of collective bargaining agreements	2/28/19			5/31/15			4/1/16
								Employer contributions (in millions):
								2013	$	3.4		$	0.9		$	0.1
								2012	3.2			0.5			0.1
								2011	3.2			0.9			0.1

HERITAGE_HEALTH_BENEFIT_EXPENS1

HERITAGE HEALTH BENEFIT EXPENSES (Tables)	3 Months Ended					12 Months Ended
	Mar. 31, 2014					Dec. 31, 2013
Heritage Health Benefit Expenses [Abstract]	'					'
Components of costs of benefits to former mining operation employees	'					'
	The components of these expenses are as follows:					The components of these expenses are as follows:
		Three Months Ended March 31,					Years Ended December 31,
		2014		2013			2013			2012			2011
		(In thousands)					(In thousands)
	Health care benefits	$	2,276	$	3,176	Health care benefits	$	12,579		$	11,367		$	9,507
	Combined benefit fund payments	512		576		Combined benefit fund payments	2,240			2,258			2,617
	Workers’ compensation benefits	136		116		Workers’ compensation benefits (credit)	(1,212		)	(1,322		)	2,132
	Black lung benefits	620		83		Black lung benefits (credit)	(189		)	1,085			4,319
	Total	$	3,544	$	3,951	Total	$	13,418		$	13,388		$	18,575

ASSET_RETIREMENT_OBLIGATIONS_C1

ASSET RETIREMENT OBLIGATIONS, CONTRACTUAL THIRD-PARTY RECLAMATION RECEIVABLES, AND RECLAMATION DEPOSITS (Tables)	3 Months Ended									12 Months Ended
	Mar. 31, 2014									Dec. 31, 2013
Asset Retirement Obligation Disclosure [Abstract]	'									'
Summary of asset retirement obligations, contractual third-party reclamation receivables and reclamation deposits	'									'
	The asset retirement obligation, contractual third-party reclamation receivable, and reclamation deposits for each of the Company’s mines and ROVA at March 31, 2014 are summarized below:									The asset retirement obligation, contractual third-party reclamation receivable, and reclamation deposits for each of the Company’s mines and ROVA at December 31, 2013 are summarized below:
		Asset			Contractual			Reclamation			Asset			Contractual			Reclamation
		Retirement			Third-Party			Deposits			Retirement			Third-Party			Deposits
		Obligation			Reclamation						Obligation			Reclamation
					Receivable									Receivable
		(In thousands)									(In thousands)
	Rosebud	$	127,989		$	21,656		$	75,315	Rosebud	$	126,965		$	21,186		$	74,921
	Jewett	74,247			74,247			—		Jewett	75,267			75,267			—
	Absaloka	37,286			346			—		Absaloka	36,401			337			—
	Beulah	17,764			—			—		Beulah	17,785			—			—
	Kemmerer	17,569			—			—		Kemmerer	17,174			—			—
	Savage	5,499			—			—		Savage	5,380			—			—
	ROVA	909			—			—		ROVA	892			—			—
	Total	$	281,263		$	96,249		$	75,315	Total	$	279,864		$	96,790		$	74,921
Changes in Company's asset retirement obligations	'									'
	Changes in the Company’s asset retirement obligations were as follows:									Changes in the Company’s asset retirement obligations were as follows:
		Three Months Ended March 31,									Years Ended December 31,
		2014			2013						2013			2012
		(In thousands)									(In thousands)
	Asset retirement obligations, beginning of year (including current portion)	$	279,864		$	263,847				Asset retirement obligations, beginning of year (including current portion)	$	263,847		$	247,478
	Accretion	5,836			5,481					Accretion	21,905			21,909
	Liabilities settled	(4,437		)	(5,839		)			Liabilities settled	(21,630		)	(17,342		)
	Asset retirement obligations, end of period	281,263			263,489					Changes due to amount and timing of reclamation	15,742			(7,575		)
	Less current portion	(22,227		)	(23,154		)			ARO acquired	—			19,377
	Asset retirement obligations, less current portion	$	259,036		$	240,335
										Asset retirement obligations, end of year	279,864			263,847
										Less current portion	(23,353		)	(22,238		)
										Asset retirement obligations, less current portion	$	256,511		$	241,609
Carrying value and estimated fair value of reclamation deposits	'									'
	The Company’s carrying value and estimated fair value of its reclamation deposits at March 31, 2014 are as follows:									The Company’s carrying value and estimated fair value of its reclamation deposits at December 31, 2013 are as follows:
		Carrying Value			Fair Value			Fair Value Hierarchy			Carrying Value			Fair Value
		(In thousands)									(In thousands)
	Cash and cash equivalents	$	49,627		$	49,627		Level 1		Cash and cash equivalents	$	63,525		$	63,525
	Held-to-maturity securities	25,688			26,401			Level 2		Held-to-maturity securities	11,396			12,086
		$	75,315		$	76,028					$	74,921		$	75,611
Amortized cost, gross unrealized holding gains and losses and fair value of held-to-maturity securities	'									'
	The amortized cost, gross unrealized holding gains and fair value of held-to-maturity securities at March 31, 2014 is as follows (in thousands):									The amortized cost, gross unrealized holding gains and losses and fair value of held-to-maturity securities are as follows:
	Amortized cost	$	34,548								December 31,
											2013			2012
	Gross unrealized holding gains	440									(In thousands)
										Amortized cost	$	32,184		$	3,983
	Gross unrealized holding losses	(281		)
	Fair value	$	34,707							Gross unrealized holding gains	309			356
										Gross unrealized holding losses	(447		)	—
										Fair value	$	32,046		$	4,339
										The amortized cost, gross unrealized holding gains and losses and fair value of held-to-maturity securities are as follows:
											Years Ended December 31,
											2013			2012
											(In thousands)
										Amortized cost	$	11,396		$	19,832
										Gross unrealized holding gains	764			1,190
										Gross unrealized holding losses	(74		)	(9		)
										Fair value	$	12,086		$	21,013
Schedule of maturities of held-to-maturity investments	'									'
	Maturities of held-to-maturity securities are as follows at March 31, 2014:									Maturities of held-to-maturity securities are as follows at December 31, 2013:
		Amortized Cost			Fair Value						Amortized Cost			Fair Value
		(In thousands)									(In thousands)
	Due within one year	$	1,193		$	1,217				Due within one year	$	1,111		$	1,143
	Due in five years or less	19,539			19,752					Due in five years or less	17,839			17,944
	Due after five years to ten years	6,718			6,717					Due after five years to ten years	6,769			6,665
	Due in more than ten years	7,098			7,021					Due in more than ten years	6,465			6,294
		$	34,548		$	34,707					$	32,184		$	32,046
	Maturities of held-to-maturity securities are as follows at March 31, 2014:									Maturities of held-to-maturity securities are as follows at December 31, 2013:
		Amortized Cost			Fair Value						Amortized Cost			Fair Value
		(In thousands)									(In thousands)
	Within one year	$	479		$	468				Within one year	$	17		$	17
	Due in five years or less	17,562			17,880					Due in five years or less	6,645			6,976
	Due after five years to ten years	4,869			5,023					Due after five years to ten years	3,002			3,123
	Due in more than ten years	2,778			3,030					Due in more than ten years	1,732			1,970
		$	25,688		$	26,401					$	11,396		$	12,086
Cost basis, gross unrealized holding gains and fair value of available-for-sale securities	'									'
										The cost basis, gross unrealized holding gains and fair value of available-for-sale securities are as follows:
											December 31,
											2013			2012
											(In thousands)
										Cost basis	$	—		$	1,000
										Gross unrealized holding gains	—			39
										Fair value	$	—		$	1,039
Held To Maturity Reclamation Deposits Table	'									'
	The amortized cost, gross unrealized holding gains and losses and fair value of held-to-maturity securities at March 31, 2014 are as follows (in thousands):
	Amortized cost	$	25,688
	Gross unrealized holding gains	826
	Gross unrealized holding losses	(113		)
	Fair value	$	26,401

DERIVATIVE_INSTRUMENTS_1_Table

DERIVATIVE INSTRUMENTS 1 (Tables)

3 Months Ended

12 Months Ended

Mar. 31, 2014

Dec. 31, 2013

Derivative Instruments and Hedging Activities Disclosure [Abstract]

'

'

Effect of derivatives on statements of operations

'

'

The effect of derivative instruments not designated as hedging instruments on the accompanying consolidated statements of operations was as follows (in thousands):

Statement of

Income Recognized in

Operations Location

Earnings on Derivatives

Years Ended December 31,

Derivative Instrument

2013

2012

2011

Convertible debt -conversion feature

Other income (loss)

$

—

$

—

$

3,079

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 Consolidated Balance Sheets was as follows (in thousands):

Derivative Instruments

Balance Sheet Location

March 31, 2014

Canadian dollar foreign exchange forward contracts

Other current assets

$

246

Canadian dollar foreign exchange forward contracts

Other current liabilities

(7,036

)

The effect of derivative instruments not designated as hedging instruments on the accompanying Consolidated Statements of Operations was as follows (in thousands):

Derivative Instruments

Statement of

Three Months Ended March 31, 2014

Operations Location

Canadian dollar foreign exchange forward contracts

Loss on foreign exchange

$

(6,790

)

FAIR_VALUE_MEASUREMENTS_Tables

FAIR VALUE MEASUREMENTS (Tables)	3 Months Ended					12 Months Ended
	Mar. 31, 2014					Dec. 31, 2013
Fair Value Disclosures [Abstract]	'					'
Estimated fair values of Company's debt	'					'
	The estimated fair values of the Company’s debt with fixed interest rates are as follows:					The estimated fair value of the Company’s debt with fixed interest rates are as follows:
		Carrying Value		Fair Value			Carrying Value		Fair Value
		(In thousands)					(In thousands)
	31-Dec-13	$	328,473	$	364,329	31-Dec-12	$	345,408	$	359,753
	March 31, 2014	$	777,670	$	823,603	31-Dec-13	$	328,473	$	364,329
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 on a recurring basis:
							Year Ended December 31, 2012
							Level 1		Level 2		Level 3		Total
							(In thousands)
						Assets:
						Available-for-sale investments included in Restricted investments and bond collateral	$	191	$	—	$	—	$	191
						Available-for-sale investments included in Reclamation deposits	1,039		—		—		1,039
						Total assets	$	1,230	$	—	$	—	$	1,230

RESTRICTED_STOCK_UNITS_STOCK_O1

RESTRICTED STOCK UNITS, STOCK OPTIONS, AND STOCK APPRECIATION RIGHTS (SARs) (Tables)	3 Months Ended														12 Months Ended
	Mar. 31, 2014														Dec. 31, 2013
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:														Compensation cost arising from share-based arrangements is shown in the following table:
		Three Months Ended March 31,														Years Ended December 31,
		2014			2013											2013			2012			2011
		(In thousands)														(In thousands)
	Recognition of fair value of restricted stock units, stock options and SARs over vesting period; and issuance of stock	$	728		$	1,663									Recognition of fair value of restricted stock units, stock options and SARs over vesting period; and issuance of stock	$	2,967		$	3,088		$	1,969
	Contributions of stock to the Company's 401(k) plan	—			723										Contributions of stock to the Company’s 401(k) plan	2,355			2,952			2,752
	Total share-based compensation expense	$	728		$	2,386									Total share-based compensation expense	$	5,322		$	6,040		$	4,721
Summary of Restricted Stock Unit activity	'														'
	A summary of restricted stock award activity for the three months ended March 31, 2014 is as follows:														A summary of restricted stock award activity for the year ended December 31, 2013 is as follows:
		Units		Weighted			Unamortized									Units		Weighted Average			Unamortized
				Average			Compensation											Grant-Date Fair			Compensation
				Grant-Date			Expense											Value			Expense
				Fair Value			(In thousands)														(In thousands)
	Non-vested at December 31, 2013	588,727		$	9.37										Non-vested at December 31, 2012	680,185		$	8.88
	Granted	—		—											Granted	103,730		$	11.7
	Vested	—		—											Vested	(195,940	)	$	8.62
	Non-vested at March 31, 2014	588,727		$	9.37		$	1,618		(1)					Forfeited	—		$	—
	____________________														Non-vested at December 31, 2013	587,975		$	9.46		$	2,346		(1)
	-1	Expected to be recognized over the next three years.													____________________
															-1	Expected to be recognized over the next three years.
															Additional information related to restricted stock units:
															Years Ended December 31:	Weighted			Total
																Average			Grant- Date
																Grant-Date			Fair Value of
																Fair Value			Restricted Stock
																			Units that Vested
																			(In thousands)
															2013	$	11.7		$	1,689
															2012	$	7.57		$	1,336
															2011	$	14.99		$	1,757
Summary of Stock Option activity	'														'
	A summary of stock option activity for the three months ended March 31, 2014 is as follows:														Information with respect to stock option activity for the year ended December 31, 2013, is as follows:
		Stock Options		Weighted			Weighted			Aggregate Intrinsic			Unamortized			Stock Options		Weighted			Weighted		Aggregate		Unamortized
				Average			Average			Value			Compensation					Average			Average		Intrinsic		Compensation
				Exercise Price			Remaining			(In thousands)			Expense					Exercise Price			Remaining		Value		Expense
							Contractual						(In thousands)								Contractual		(In thousands)		(In thousands)
							Life														Life
							(In years)														(In years)
	Outstanding at December 31, 2013	145,806		$	21.97										Outstanding at December 31, 2012	170,823		$	21.3
	Exercised	—		$	—										Expired	(25,017	)	$	17.41
	Expired	—		$	—										Outstanding and exercisable at December 31, 2013	145,806		$	21.97		4.254		$	—	$	—
	Outstanding and exercisable at March 31, 2014	145,806		$	21.97		4			$	1,139		$	—	Additional information related to stock options:
															Years Ended December 31:	Intrinsic Value of			Total Grant-Date
																Stock Options			Fair Value of Stock
																Exercised			Options that Vested
																(In thousands)
															2013	$	—		$	—
															2012	$	—		$	—
															2011	$	86		$	538
Summary of Stock Appreciation Rights	'														'
	A summary of SARs activity for the three months ended March 31, 2014 is as follows:														Information with respect to SARs granted and outstanding for the year ended December 31, 2013 is as follows:
		SARs		Weighted			Weighted		Aggregate Intrinsic			Unamortized				SARs		Weighted			Weighted		Aggregate		Unamortized
				Average Exercise Price			Average		Value			Compensation						Average Exercise Price			Average		Intrinsic		Compensation
							Remaining		(In thousands)			Expense									Remaining		Value		Expense
							Contractual					(In thousands)									Contractual		(In thousands)		(In thousands)
							Life														Life
							(In years)														(In years)
	Outstanding at December 31, 2013	70,734		$	22.6										Outstanding at December 31, 2012	70,734		$	22.6
	Exercised	(25,667	)	$	—										Expired	—		$	—
	Expired	—		$	—										Outstanding and exercisable at December 31, 2013	70,734		$	22.6		1.7		$	—	$	—
	Outstanding and exercisable at March 31, 2014	45,067		$	23.95		1.9		$	352		$	—

STOCKHOLDERS_EQUITY_AND_ACCUMU1

STOCKHOLDERS' EQUITY AND ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) (Tables)	3 Months Ended														12 Months Ended
	Mar. 31, 2014														Dec. 31, 2013
Equity [Abstract]	'														'
Schedule of Accumulated Other Comprehensive Income (Loss)	'														'
	The following table reflects the changes in accumulated other comprehensive loss by component:
															The following table reflects the changes in accumulated other comprehensive income (loss) by component:
		Pension				Postretirement			Tax effect of			Accumulated
						medical benefits			other			other				Pension				Postretirement			Available for			Tax effect of			Accumulated
									comprehensive			comprehensive								medical benefits			sale			other			other
									income gains			loss											securities			comprehensive			comprehensive
		(In thousands)																								income gains			loss
	Balance at December 31, 2013	$	(12,255	)		$	(20,292	)	$	(31,048	)	$	(63,595	)		(In thousands)
	Other comprehensive income (loss) before reclassifications	—				—			(138		)	(138		)	Balance at December 31, 2012	$	(44,719	)		$	(77,527	)	$	57		$	(26,156	)	$	(148,345	)
	Amounts reclassified from accumulated other comprehensive income (loss)	359				5			—			364			Other comprehensive income before reclassifications	28,974				53,230			(45		)	(4,892		)	77,267
	Balance at March 31, 2014	$	(11,896	)		$	(20,287	)	$	(31,186	)	$	(63,369	)	Amounts reclassified from accumulated other comprehensive income (loss)	3,490				4,005			(12		)	—			7,483
															Balance at December 31, 2013	$	(12,255	)		$	(20,292	)	$	—		$	(31,048	)	$	(63,595	)
															The following is a summary of accumulated other comprehensive income (loss):
																Pension and				Available for			Tax Effect of			Accumulated
																Postretirement				Sale			Other			Other
																Medical Benefits				Securities			Comprehensive			Comprehensive
																							Income Gains			Loss
																(In thousands)
															Balance at January 1, 2011	$	(32,049	)		$	525		$	(26,156	)	$	(57,680	)
															2011 activity	(63,575		)		(200		)	—			(63,775		)
															Balance at December 31, 2011	(95,624		)		325			(26,156		)	(121,455		)
															2012 activity	(26,622		)		(268		)	—			(26,890		)
															Balance at December 31, 2012	(122,246		)		57			(26,156		)	(148,345		)
															2013 activity	89,699				(57		)	(4,892		)	84,750
															Balance at December 31, 2013	$	(32,547	)		$	—		$	(31,048	)	$	(63,595	)
Reclassification out of Accumulated Other Comprehensive Income [Table Text Block]	'														'
	The following table reflects the reclassifications out of accumulated other comprehensive loss for the three months ended March 31, 2014 are as follows (in thousands):														The following table reflects the reclassifications out of accumulated other comprehensive income (loss) for the year ended December 31, 2013 (in thousands):
	Details about accumulated other comprehensive loss components		Amount reclassified from accumulated				Affected line item								Details about accumulated other comprehensive income (loss) components		Amount reclassified from accumulated				Affected line item
			other comprehensive loss1				in the statement										other comprehensive income (loss)(1)				in the statement
							where net income														where net income
			Three Months Ended March 31, 2014				(loss) is presented														(loss) is presented
	Amortization of defined benefit pension items														Available-for sale securities
	Actuarial losses		$	359			2								Realized gains and losses on available-for sale securities		$	(12	)		Other income (loss)
																	$	(12	)		Total
	Amortization of postretirement medical items														Amortization of defined benefit pension items:
	Prior service costs		$	(159	)		3								Actuarial losses		$	3,490			(2)
	Actuarial losses		164				3
															Amortization of postretirement medical items:
			$	5			Total								Prior service costs		$	(636	)		(3)
															Actuarial losses		4,641				(3)
	____________________
																	$	4,005			Total
	-1	Amounts in parentheses indicate debits to income/loss.
															____________________
	-2	These accumulated other comprehensive loss components are included in the computation of net periodic pension cost. (See Note 5 - Pension for additional details)
															-1	Amounts in parentheses indicate debits to income/loss.
	-3	These accumulated other comprehensive loss components are included in the computation of net periodic postretirement medical cost. (See Note 5 - Postretirement Medical Benefits for additional details)
															-2	These accumulated other comprehensive income components are included in the computation of net periodic pension cost. (See Note 7 - Pension and Other Savings Plans for additional details)
															-3	These accumulated other comprehensive income components are included in the computation of net periodic postretirement medical cost. (See Note 6 - Postretirement Medical Benefits for additional details)

INCOME_TAX_Tables

INCOME TAX (Tables)	12 Months Ended
	Dec. 31, 2013
Income Tax Disclosure [Abstract]	'
Schedule of components of income tax expense (benefit)	'
	Income tax expense (benefit) attributable to net loss before income taxes consists of:
		Years Ended December 31,
		2013			2012			2011
		(In thousands)
	Current:
	Federal	$	(2	)	$	(8	)	$	(174	)
	State	112			98			168
		110			90			(6		)
	Deferred:
	Federal	(4,189		)	—			—
	State	(703		)	—			(420		)
		(4,892		)	—			(420		)
	Income tax expense (benefit)	$	(4,782	)	$	90		$	(426	)
Schedule of effective income tax rate reconciliation	'
	Income tax expense (benefit) attributable to net loss before income taxes differed from the amounts computed by applying the statutory Federal income tax rate of 34% to pre-tax income as a result of the following:
		Years Ended December 31,
		2013			2012			2011
		(In thousands)
	Computed tax benefit at statutory rate	$	(4,389	)	$	(4,615	)	$	(12,683	)
	Increase (decrease) in tax expense resulting from:
	Tax depletion in excess of basis	(6,187		)	(4,782		)	(3,820		)
	Non-deductible interest expense	—			—			3,717
	Noncontrolling interest	1,167			2,188			1,283
	State income taxes, net	(2,506		)	(3,427		)	(4,548		)
	Change in valuation allowance for net deferred tax assets	15			8,571			2,923
	Indian Coal Tax Credits	92			83			(122		)
	Federal and state NOL expiration	—			153			11,226
	Change in state effective tax rate	6,202			2,049			1,310
	Other, net	824			(130		)	288
	Income tax expense (benefit)	$	(4,782	)	$	90		$	(426	)
Income tax benefit on amounts recognized in OCI	'
	In accordance with GAAP, the Company recorded a tax benefit on its loss from continuing operations, which was exactly offset by income tax expense on other comprehensive income as follows:
		Loss From			Other			Total
		Continuing			Comprehensive			Comprehensive
		Operations			Income			Income
		(In thousands)
	Pre-allocation	$	110		$	—		$	110
	Tax allocation	(4,892		)	4,892			—
	As presented	$	(4,782	)	$	4,892		$	110
	Components of OCI gain:
		Gross			Tax Allocation
	Pension	$	32,464		$	1,772
	Post-retirement benefits	57,235			3,123
	Unrealized gain (loss) on securities	(57		)	(3		)
	Total	$	89,642		$	4,892
Schedule of components of deferred tax assets and liabilities	'
	The tax effects of temporary differences that give rise to significant portions of the deferred tax assets and deferred tax liabilities are presented below:
		December 31,
		2013			2012
		(In thousands)
	Deferred tax assets:
	Federal net operating loss carryforwards	$	89,698		$	84,330
	State net operating loss carryforwards	26,509			28,700
	Alternative minimum tax credit carryforwards	7,179			6,973
	Charitable contribution carryforwards	146			132
	Indian Coal Tax Credit carryforwards	25,499			25,591
	Accruals for the following:
	Workers’ compensation	2,726			3,592
	Postretirement medical benefit and pension obligations	106,912			138,710
	Incentive plans	1,606			1,995
	Asset retirement obligations	68,989			77,698
	Deferred revenues	18,919			22,500
	Excess of pneumoconiosis benefit obligation over trust assets	3,262			3,185
	Acquisition Costs	1,276			198
	Restructuring	1,909			—
	Other accruals	6,656			6,035
	Total gross deferred assets	361,286			399,639
	Less valuation allowance	(264,464		)	(293,504		)
	Net deferred tax assets	96,822			106,135
	Deferred tax liabilities:
	Property, plant and equipment, differences due to depreciation and amortization	(94,868		)	(104,992		)
	Other	(1,954		)	(1,143		)
	Total gross deferred tax liabilities	(96,822		)	(106,135		)
	Net deferred tax asset	$	—		$	—
Summary of available Federal net operating loss carryforwards	'
	As of December 31, 2013, the Company has available Federal net operating loss carryforwards to reduce future regular taxable income, which expire as follows:
	Expiration Date		Regular Tax
			(In thousands)
	2018		$	28
	2019		88,429
	2020		32
	2021		20
	after 2022		176,413
	Total		$	264,922
Schedule of unrecognized tax benefits roll forward	'

COMMITMENTS_AND_CONTINGENCIES_

COMMITMENTS AND CONTINGENCIES (Tables)	12 Months Ended
	Dec. 31, 2013
Commitments and Contingencies Disclosure [Abstract]	'
Gross value and accumulated amortization of property, plant and equipment and mine development assets under capital leases	'
	The following shows the gross value and accumulated amortization of property, plant and equipment and mine development assets under capital leases related primarily to the leasing of mining equipment:
		2013			2012
		(In thousands)
	Gross value	$	24,982		$	34,677
	Accumulated amortization	11,983			15,887
Future minimum capital and operating lease payments	'
	Future minimum capital and operating lease payments as of December 31, 2013, are as follows:
		Capital			Operating
		Leases			Leases
		(In thousands)
	2014	$	5,949		$	7,896
	2015	2,419			5,156
	2016	1,548			2,584
	2017	495			1,256
	2018	316			515
	Thereafter	—			—
	Total minimum lease payments	10,727			$	17,407
	Less imputed interest	(574		)
	Present value of minimum capital lease payments	$	10,153

EARNINGS_PER_SHARE_Tables

EARNINGS PER SHARE (Tables)	3 Months Ended			12 Months Ended
	Mar. 31, 2014			Dec. 31, 2013
Earnings Per Share [Abstract]	'			'
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:			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,			Years Ended December 31,
		2014	2013		2013	2012	2011
		(In thousands)			(In thousands)
	Convertible securities	828	1,093	Convertible notes and securities	1,093	1,093	1,093
	Restricted stock units, stock options and SARs	779	978	Restricted stock units, stock options, and SARs	805	978	634
	Total shares excluded from diluted shares calculation	1,607	2,071	Total shares excluded from diluted shares calculation	1,898	2,071	1,727

BUSINESS_SEGMENT_INFORMATION_T

BUSINESS SEGMENT INFORMATION (Tables)	3 Months Ended															12 Months Ended
	Mar. 31, 2014															Dec. 31, 2013
Segment Reporting [Abstract]	'															'
Summarized financial information by segment	'															'
	Summarized financial information by segment is as follows:															Summarized financial information by segment is as follows:
		Coal			Power			Heritage			Corporate			Consolidated			Coal			Power			Heritage			Corporate			Consolidated
		(In thousands)															(In thousands)
	Three Months Ended March 31, 2014															31-Dec-13
	Revenues	$	158,190		$	22,012		$	—		$	—		$	180,202	Revenues	$	587,119		$	87,567		$	—		$	—		$	674,686
	Restructuring charges	—			397			—			—			397		Restructuring charges	—			5,078			—			—			5,078
	Depreciation, depletion, and amortization	13,459			2,524			—			76			16,059		Operating income (loss)	44,471			4,907			(14,498		)	(9,518		)	25,362
	Operating income (loss)	13,447			1,744			(3,830		)	(3,308		)	8,053		Depreciation, depletion, and amortization	56,698			10,179			—			354			67,231
	Total assets	697,916			167,998			15,622			525,611			1,407,147		Total assets	705,816			180,684			15,497			44,688			946,685
	Capital expenditures	3,053			35			—			(38		)	3,050		Capital expenditures	27,064			790			—			737			28,591
	Three Months Ended March 31, 2013															31-Dec-12
	Revenues	$	142,112		$	19,336		$	—		$	—		$	161,448	Revenues	$	519,152		$	81,285		$	—		$	—		$	600,437
	Depreciation, depletion, and amortization	11,801			2,531			—			94			14,426		Operating income (loss)	48,235			8,244			(14,711		)	(12,896		)	28,872
	Operating income (loss)	13,472			(1,003		)	(4,175		)	(2,560		)	5,734		Depreciation, depletion, and amortization	46,639			10,085			—			421			57,145
	Total assets	711,128			186,309			15,877			29,701			943,015		Total assets	703,315			189,599			15,508			27,693			936,115
	Capital expenditures	5,010			134			—			157			5,301		Capital expenditures	18,804			2,070			—			158			21,032
																31-Dec-11
																Revenues	$	414,928		$	86,785		$	—		$	—		$	501,713
																Operating income (loss)	27,453			12,119			(19,675		)	(9,271		)	10,626
																Depreciation, depletion, and amortization	35,112			10,176			—			306			45,594
																Total assets	510,507			194,730			13,769			40,166			759,172
																Capital expenditures	24,678			2,119			—			797			27,594
Reconciliation of segment operating income to income (loss)	'															'
	A reconciliation of segment income (loss) from operations to loss before income taxes follows:															A reconciliation of segment income from operations to loss before income taxes follows:
		Three Months Ended March 31,															Years Ended
		2014			2013												2013			2012			2011
		(In thousands)															(In thousands)
	Income from operations	$	8,053		$	5,734										Income from operations	$	25,362		$	28,872		$	10,626
	Interest expense	(20,798		)	(10,160		)									Loss on extinguishment of debt	(64		)	(1,986		)	(17,030		)
	Interest income	302			297											Interest expense	(39,937		)	(42,677		)	(29,769		)
																Interest income	1,366			1,496			1,444
	Loss on foreign exchange	(6,790		)	—
																Other income (loss)	364			723			(2,572		)
	Other income	93			70
																Loss before income taxes	$	(12,909	)	$	(13,572	)	$	(37,301	)
	Loss before income taxes	$	(19,140	)	$	(4,059	)
Schedule of revenue by major customers by segment	'															'
																The Company derives its revenues from a few key customers. The customers from which more than 10% of total revenue has been derived and the percentage of total revenue from those customers is summarized as follows:
																	2013			2012			2011
																	(In thousands)
																Customer A – coal	$	117,545		$	126,982		$	120,243
																Customer B – coal (1)	112,061			96,718			—
																Customer C – coal	89,266			81,981			81,353
																Customer D – power	86,390			80,109			85,639
																Customer E – coal	85,929			66,128			65,224
																Customer F – coal (2)	25,958			26,525			52,835
																Percentage of total revenue	77		%	80		%	81		%
																____________________
																-1	The revenue from Customer B did not exceed 10% in 2011.
																-2	The revenue from Customer F did not exceed 10% in

QUARTERLY_FINANCIAL_DATA_UNAUD1

QUARTERLY FINANCIAL DATA (UNAUDITED) (Tables)	12 Months Ended
	Dec. 31, 2013
Quarterly Financial Information Disclosure [Abstract]	'
Schedule of quarterly financial data (unaudited)	'
	Summarized quarterly financial data is as follows:
		Three Months Ended
		March 31			June 30			September 30		December 31
		(In thousands; except per share data)
	2013:00:00
	Revenues	$	161,448		$	162,499		$	176,792	$	173,947
	Operating income (loss)	5,734			11,975			8,536		(883		)
	Net income (loss) applicable to common shareholders	(2,725		)	(622		)	2,421		(5,131		)
	Basic income (loss) per common share	$	(0.19	)	$	(0.04	)	$	0.17	$	(0.35	)
	2012:00:00
	Revenues	$	147,236		$	132,842		$	161,332	$	159,027
	Operating income (loss)	9,086			(4,262		)	15,451		8,597
	Net income (loss) applicable to common shareholders	518			(12,423		)	7,282		(3,963		)
	Basic income (loss) per common share	$	0.04		$	(0.89	)	$	0.52	$	(0.28	)

SUPPLEMENTAL_CONSOLIDATING_FIN1

SUPPLEMENTAL CONSOLIDATING FINANCIAL INFORMATION (Tables)	3 Months Ended																									12 Months Ended
	Mar. 31, 2014																									Dec. 31, 2013
Condensed Financial Information of Parent Company Only Disclosure [Abstract]	'																									'
Supplemental Consolidating Balance Sheet Information	'																									'
	CONSOLIDATING BALANCE SHEETS(1)
	March 31, 2014
	(In thousands)																									Assets		Parent/				Co-Issuer				Guarantor				Non-				Consolidating				Total
																												Issuer								Subsidiaries				Guarantor				Adjustments
																																								Subsidiaries
																										Current assets:
	Assets		Parent/				Co-Issuer				Guarantor				Non-				Consolidating				Total			Cash and cash equivalents		$	25,326			$	3,341			$	7,942			$	24,501			$	—			$	61,110
			Issuer								Subsidiaries				Guarantor				Adjustments
															Subsidiaries											Receivables:
	Current assets:																									Trade		—				12,934				17,389				35,873				—				66,196
	Cash and cash equivalents		$	28,759			$	4,043			$	8,794			$	20,304			$	—			$	61,900
																										Contractual third-party reclamation receivables		—				—				44				8,443				—				8,487
	Receivables:
	Trade		—				12,456				22,857				29,402				—				64,715			Intercompany receivable/payable		(3,568		)		—				4,384				(33,681		)		32,865				—
	Contractual third-party reclamation receivables		—				—				44				8,169				—				8,213			Other		95				210				2,974				1,831				(24		)		5,086
	Intercompany receivable/payable		(2,263		)		—				3,499				(33,946		)		32,710				—					(3,473		)		13,144				24,791				12,466				32,841				79,769
	Other		273				208				244				681				(31		)		1,375			Inventories		—				6,161				16,077				17,735				(1		)		39,972
			(1,990		)		12,664				26,644				4,306				32,679				74,303			Deferred income taxes		—				—				870				—				(870		)		—
	Inventories		—				1,845				15,133				18,469				—				35,447			Restricted investments and bond collateral		—				5,998				—				—				—				5,998
	Restricted investments and bond collateral		16,900				—				—				—				—				16,900			Other current assets		6,115				143				6,883				5,049				—				18,190
	Other current assets		7,044				425				3,168				6,005				1				16,643			Total current assets		27,968				28,787				56,563				59,751				31,970				205,039
	Total current assets		50,713				18,977				53,739				49,084				32,680				205,193			Property, plant and equipment:
																										Land and mineral rights		—				1,395				104,631				172,163				(1		)		278,188
	Property, plant and equipment:
	Land and mineral rights		—				1,395				104,640				172,163				—				278,198			Plant and equipment		3,939				220,872				229,998				202,886				1				657,696
	Plant and equipment		3,966				220,932				245,368				202,923				—				673,189					3,939				222,267				334,629				375,049				—				935,884
			3,966				222,327				350,008				375,086				—				951,387			Less accumulated depreciation, depletion and amortization		2,705				71,653				132,189				239,302				(1		)		445,848
	Less accumulated depreciation, depletion and amortization		2,781				74,177				138,718				246,079				(1		)		461,754			Net property, plant and equipment		1,234				150,614				202,440				135,747				1				490,036
	Net property, plant and equipment		1,185				148,150				211,290				129,007				1				489,633			Advanced coal royalties		—				—				3,000				4,311				—				7,311
	Advanced coal royalties		—				—				3,000				4,263				—				7,263			Reclamation deposits		—				—				—				74,921				—				74,921
	Reclamation deposits		—				—				—				75,315				—				75,315			Restricted investments and bond collateral		15,134				—				36,619				17,482				—				69,235
	Restricted investments and bond collateral		469,385				—				36,615				17,483				—				523,483			Contractual third-party reclamation receivables		—				—				293				88,010				—				88,303
	Contractual third-party reclamation receivables		—				—				302				87,734				—				88,036			Intangible assets		—				1,283				—				238				(1		)		1,520
	Intangible assets		—				871				—				228				—				1,099			Investment in subsidiaries		266,847				—				—				3,770				(270,617		)		—
	Investment in subsidiaries		237,926				—				—				3,770				(241,696		)		—			Other assets		8,636				—				586				3,098				(2,000		)		10,320
	Other assets		15,563				—				569				4,493				(3,500		)		17,125			Total assets		$	319,819			$	180,684			$	299,501			$	387,328			$	(240,647	)		$	946,685
	Total assets		$	774,772			$	167,998			$	305,515			$	371,377			$	(212,515	)		$	1,407,147		____________________
																										(1)    This table is presented for historical information and presents WML and its subsidiaries as non-guarantor subsidiaries. WML and its subsidiaries became additional guarantor subsidiaries effective on July 31, 2014.
	____________________																									CONSOLIDATING BALANCE SHEETS (1)
	(1)    This table is presented for historical information and presents WML and its subsidiaries as non-guarantor subsidiaries. WML and its subsidiaries became additional guarantor subsidiaries effective on July 31, 2014.																									December 31, 2013
																										(In thousands)
	CONSOLIDATING BALANCE SHEETS(1)
	March 31, 2014
	(In thousands)
																										Liabilities and Shareholders’ Deficit		Parent/				Co-Issuer				Guarantor				Non-				Consolidating				Total
																												Issuer								Subsidiaries				Guarantor				Adjustments
																																								Subsidiaries
	Liabilities and Shareholders’ Deficit		Parent/				Co-Issuer				Guarantor				Non-				Consolidating				Total			Current liabilities
			Issuer								Subsidiaries				Guarantor				Adjustments							Current installments of long-term debt		$	20,392			$	—			$	2,790			$	21,161			$	—			$	44,343
															Subsidiaries
	Current liabilities																									Accounts payable and accrued expenses:
	Current installments of long-term debt		$	22,785			$	—			$	4,596			$	21,205			$	—			$	48,586		Trade		4,122				10,119				12,522				30,743				1				57,507
	Accounts payable and accrued expenses:																									Production taxes		—				3				17,429				24,472				1				41,905
	Trade		9,000				6,331				14,710				32,557				—				62,598
																										Workers’ compensation		717				—				—				—				—				717
	Production taxes		—				405				22,442				23,947				—				46,794
																										Postretirement medical benefits		12,042				—				329				1,583				1				13,955
	Workers’ compensation		712				—				—				—				—				712
																										SERP		390				—				—				—				—				390
	Postretirement medical benefits		12,042				—				329				1,583				1				13,955
																										Deferred revenue		—				9,024				3,969				1,075				—				14,068
	SERP		390				—				—				—				—				390
																										Asset retirement obligations		—				—				3,104				20,250				(1		)		23,353
Deferred revenue		—				9,581				4,813				1,640				—				16,034
																									Other current liabilities		11,302				5,053				317				142				(24		)		16,790
Asset retirement obligations		—				—				3,554				18,673				—				22,227
																									Total current liabilities		48,965				24,199				40,460				99,426				(22		)		213,028
Other current liabilities		19,196				5,053				—				172				(31		)		24,390
																									Long-term debt, less current installments		224,582				—				2,664				70,248				(2,000		)		295,494
Total current liabilities		64,125				21,370				50,444				99,777				(30		)		235,686
																									Workers’ compensation, less current portion		6,744				—				—				—				—				6,744
Long-term debt, less current installments		677,385				—				12,912				64,848				(3,500		)		751,645
																									Excess of black lung benefit obligation over trust assets		8,675				—				—				—				—				8,675
Workers’ compensation, less current portion		6,680				—				—				—				—				6,680
																									Postretirement medical benefits, less current portion		185,858				—				49,418				35,098				—				270,374
Excess of black lung benefit obligation over trust assets		9,376				—				—				—				—				9,376
																									Pension and SERP obligations, less current portion		13,069				99				9,381				1,627				—				24,176
Postretirement medical benefits, less current portion		185,447				—				50,472				35,356				—				271,275
																									Deferred revenue, less current portion		—				41,297				—				5,271				(1		)		46,567
Pension and SERP obligations, less current portion		12,921				98				9,494				1,011				—				23,524
																									Asset retirement obligations, less current portion		—				892				50,472				205,147				—				256,511
Deferred revenue, less current portion		—				38,325				—				4,974				—				43,299
																									Intangible liabilities		—				5,606				—				—				—				5,606
Asset retirement obligations, less current portion		—				909				51,300				206,827				—				259,036
																									Other liabilities		5,939				—				6,220				1,450				(6,220		)		7,389
Intangible liabilities		—				5,339				—				—				—				5,339
																									Intercompany receivable/payable		13,866				—				525				6,434				(20,825		)		—
Other liabilities		6,440				—				—				1,063				—				7,503
																									Total liabilities		507,698				72,093				159,140				424,701				(29,068		)		1,134,564
Intercompany receivable/payable		18,613				—				(4,326		)		5,633				(19,920		)		—
																									Shareholders’ deficit
Total liabilities		980,987				66,041				170,296				419,489				(23,450		)		1,613,363			Preferred stock		160				—				—				—				—				160
Shareholders’ deficit																									Common stock		36,479				5				110				132				(247		)		36,479
Preferred stock		121				—				—				—				—				121
																									Other paid-in capital		134,861				52,835				94,370				64,401				(211,606		)		134,861
Common stock		37,155				5				110				132				(247		)		37,155
																									Accumulated other comprehensive income (loss)		(63,595		)		(164		)		17,492				(14,153		)		(3,175		)		(63,595		)
Other paid-in capital		134,953				52,842				92,896				66,027				(211,766		)		134,952
																									Accumulated earnings (deficit)		(295,784		)		55,915				28,389				(87,753		)		3,449				(295,784		)
Accumulated other comprehensive loss		(63,369		)		(162		)		17,372				(13,937		)		(3,273		)		(63,369		)
																									Total Westmoreland Coal Company shareholders’ deficit		(187,879		)		108,591				140,361				(37,373		)		(211,579		)		(187,879		)
Accumulated earnings (deficit)		(315,075		)		49,272				24,841				(100,334		)		26,221				(315,075		)
																									Noncontrolling interest		—				—				—				—				—				—
Total equity (deficit)		(206,215		)		101,957				135,219				(48,112		)		(189,065		)		(206,216		)
																									Total equity (deficit)		(187,879		)		108,591				140,361				(37,373		)		(211,579		)		(187,879		)
Total liabilities and shareholders’ deficit		$	774,772			$	167,998			$	305,515			$	371,377			$	(212,515	)		$	1,407,147
																									Total liabilities and shareholders’ deficit		$	319,819			$	180,684			$	299,501			$	387,328			$	(240,647	)		$	946,685
____________________
(1)    This table is presented for historical information and presents WML and its subsidiaries as non-guarantor subsidiaries. WML and its subsidiaries became additional guarantor subsidiaries effective on July 31, 2014.																									____________________
																									(1)    This table is presented for historical information and presents WML and its subsidiaries as non-guarantor subsidiaries. WML and its subsidiaries became additional guarantor subsidiaries effective on July 31, 2014.
CONSOLIDATING BALANCE SHEETS(1)
December 31, 2013																									CONSOLIDATING BALANCE SHEETS (1)
(In thousands)																									December 31, 2012
																									(In thousands)
Assets		Parent/				Co-Issuer				Guarantor				Non-				Consolidating				Total
		Issuer								Subsidiaries				Guarantor				Adjustments							Assets		Parent/				Co-Issuer				Guarantor				Non-				Consolidating				Total
														Subsidiaries													Issuer								Subsidiaries				Guarantor				Adjustments
Current assets:																																							Subsidiaries
Cash and cash equivalents		$	25,326			$	3,341			$	7,942			$	24,501			$	—			$	61,110		Current assets:
																									Cash and cash equivalents		$	14,836			$	4,545			$	5,362			$	6,867			$	—			$	31,610
Receivables:
Trade		—				12,934				17,389				35,873				—				66,196			Receivables:
																									Trade		—				13,018				13,428				33,591				—				60,037
Contractual third-party reclamation receivables		—				—				44				8,443				—				8,487
																									Contractual third-party reclamation receivables		—				—				56				10,151				—				10,207
Intercompany receivable/payable		(3,568		)		—				4,384				(33,681		)		32,865				—
																									Intercompany receivable/payable		(8,002		)		—				5,667				(30,641		)		32,976				—
Other		95				210				2,974				1,831				(24		)		5,086
																									Other		77				—				16,806				1,182				(14,845		)		3,220
		(3,473		)		13,144				24,791				12,466				32,841				79,769
																											(7,925		)		13,018				35,957				14,283				18,131				73,464
Inventories		—				6,161				16,077				17,735				(1		)		39,972
																									Inventories		—				3,047				16,538				18,149				—				37,734
Deferred income taxes		—				—				870				—				(870		)		—
																									Other current assets		739				298				5,550				9,917				—				16,504
Restricted investments and bond collateral		—				5,998				—				—				—				5,998
																									Total current assets		7,650				20,908				63,407				49,216				18,131				159,312
Other current assets		6,115				143				6,883				5,049				—				18,190
																									Property, plant and equipment:
Total current assets		27,968				28,787				56,563				59,751				31,970				205,039			Land and mineral rights		—				1,395				91,741				168,605				—				261,741
Property, plant and equipment:																									Plant and equipment		3,198				219,857				215,751				196,914				—				635,720
Land and mineral rights		—				1,395				104,631				172,163				(1		)		278,188
																											3,198				221,252				307,492				365,519				—				897,461
Plant and equipment		3,939				220,872				229,998				202,886				1				657,696
																									Less accumulated depreciation, depletion and amortization		2,364				61,474				108,151				212,632				—				384,621
		3,939				222,267				334,629				375,049				—				935,884
																									Net property, plant and equipment		834				159,778				199,341				152,887				—				512,840
Less accumulated depreciation, depletion and amortization		2,705				71,653				132,189				239,302				(1		)		445,848
																									Advanced coal royalties		—				—				500				3,816				—				4,316
Net property, plant and equipment		1,234				150,614				202,440				135,747				1				490,036
																									Reclamation deposits		—				—				—				72,718				—				72,718
Advanced coal royalties		—				—				3,000				4,311				—				7,311
																									Restricted investments and bond collateral		15,183				5,990				39,208				26,828				—				87,209
Reclamation deposits		—				—				—				74,921				—				74,921
																									Contractual third-party reclamation receivables		—				—				327				83,831				—				84,158
Restricted investments and bond collateral		15,134				—				36,619				17,482				—				69,235
																									Intangible assets		—				2,923				—				280				—				3,203
Contractual third-party reclamation receivables		—				—				293				88,010				—				88,303
																									Investment in subsidiaries		248,565				—				(792		)		3,770				(251,543		)		—
Intangible assets		—				1,283				—				238				(1		)		1,520
																									Other assets		10,267				—				635				3,457				(2,000		)		12,359
Investment in subsidiaries		266,847				—				—				3,770				(270,617		)		—
																									Total assets		$	282,499			$	189,599			$	302,626			$	396,803			$	(235,412	)		$	936,115
Other assets		8,636				—				586				3,098				(2,000		)		10,320
																									____________________
Total assets		$	319,819			$	180,684			$	299,501			$	387,328			$	(240,647	)		$	946,685		(1)    This table is presented for historical information and presents WML and its subsidiaries as non-guarantor subsidiaries. WML and its subsidiaries became additional guarantor subsidiaries effective on July 31, 2014.
____________________																									CONSOLIDATING BALANCE SHEETS (1)
(1)    This table is presented for historical information and presents WML and its subsidiaries as non-guarantor subsidiaries. WML and its subsidiaries became additional guarantor subsidiaries effective on July 31, 2014.																									December 31, 2012
CONSOLIDATING BALANCE SHEETS(1)																									(In thousands)
December 31, 2013
(In thousands)
																									Liabilities and Shareholders’ Deficit		Parent/				Co-Issuer				Guarantor				Non-Guarantor				Consolidating				Total
																											Issuer								Subsidiaries				Subsidiaries				Adjustments
Liabilities and Shareholders’ Deficit		Parent/				Co-Issuer				Guarantor				Non-Guarantor				Consolidating				Total			Current liabilities
		Issuer								Subsidiaries				Subsidiaries				Adjustments							Current installments of long-term debt		$	(1,548	)		$	—			$	1,939			$	23,400			$	—			$	23,791
Current liabilities
Current installments of long-term debt		$	20,392			$	—			$	2,790			$	21,161			$	—			$	44,343		Accounts payable and accrued expenses:
																									Trade		4,707				4,978				15,163				42,085				(14,840		)		52,093
Accounts payable and accrued expenses:
Trade		4,122				10,119				12,522				30,743				1				57,507			Production taxes		—				3				10,014				23,211				—				33,228
Production taxes		—				3				17,429				24,472				1				41,905			Workers’ compensation		820				—				—				—				—				820
Workers’ compensation		717				—				—				—				—				717			Postretirement medical benefits		12,494				—				87				1,487				—				14,068
Postretirement medical benefits		12,042				—				329				1,583				1				13,955			SERP		390				—				—				—				—				390
SERP		390				—				—				—				—				390			Deferred revenue		—				8,788				2,997				1,037				—				12,822
Deferred revenue		—				9,024				3,969				1,075				—				14,068			Asset retirement obligations		—				—				3,519				18,719				—				22,238
Asset retirement obligations		—				—				3,104				20,250				(1		)		23,353			Other current liabilities		11,312				—				10				144				(4		)		11,462
Other current liabilities		11,302				5,053				317				142				(24		)		16,790			Total current liabilities		28,175				13,769				33,729				110,083				(14,844		)		170,912
Total current liabilities		48,965				24,199				40,460				99,426				(22		)		213,028			Long-term debt, less current installments		245,456				—				2,473				91,269				(2,000		)		337,198
Long-term debt, less current installments		224,582				—				2,664				70,248				(2,000		)		295,494			Workers’ compensation, less current portion		8,710				—				—				—				—				8,710
Workers’ compensation, less current portion		6,744				—				—				—				—				6,744			Excess of black lung benefit obligation over trust assets		8,356				—				—				—				—				8,356
Excess of black lung benefit obligation over trust assets		8,675				—				—				—				—				8,675			Postretirement medical benefits, less current portion		224,336				—				55,981				39,458				—				319,775
Postretirement medical benefits, less current portion		185,858				—				49,418				35,098				—				270,374			Pension and SERP obligations, less current portion		29,265				289				19,346				5,350				—				54,250
Pension and SERP obligations, less current portion		13,069				99				9,381				1,627				—				24,176			Deferred revenue, less current portion		—				50,239				—				6,652				—				56,891
Deferred revenue, less current portion		—				41,297				—				5,271				(1		)		46,567			Asset retirement obligations, less current portion		—				829				40,063				200,717				—				241,609
Asset retirement obligations, less current portion		—				892				50,472				205,147				—				256,511			Intangible liabilities		—				6,625				—				—				—				6,625
Intangible liabilities		—				5,606				—				—				—				5,606			Other liabilities		701				—				15,677				1,642				—				18,020
Other liabilities		5,939				—				6,220				1,450				(6,220		)		7,389			Intercompany receivable/payable		23,731				—				(7,972		)		35,787				(51,546		)		—
Intercompany receivable/payable		13,866				—				525				6,434				(20,825		)		—			Total liabilities		568,730				71,751				159,297				490,958				(68,390		)		1,222,346
Total liabilities		507,698				72,093				159,140				424,701				(29,068		)		1,134,564			Shareholders’ deficit
																									Preferred stock		160				—				—				—				—				160
Shareholders’ deficit
Preferred stock		160				—				—				—				—				160			Common stock		35,502				5				110				132				(247		)		35,502
Common stock		36,479				5				110				132				(247		)		36,479			Other paid-in capital		130,852				52,807				93,456				62,539				(208,802		)		130,852
Other paid-in capital		134,861				52,835				94,370				64,401				(211,606		)		134,861			Accumulated other comprehensive loss		(148,345		)		(372		)		(4,987		)		(24,492		)		29,851				(148,345		)
Accumulated other comprehensive loss		(63,595		)		(164		)		17,492				(14,153		)		(3,175		)		(63,595		)	Accumulated earnings (deficit)		(289,727		)		65,408				54,750				(132,334		)		12,176				(289,727		)
Accumulated earnings (deficit)		(295,784		)		55,915				28,389				(87,753		)		3,449				(295,784		)	Total Westmoreland Coal Company shareholders’ deficit		(271,558		)		117,848				143,329				(94,155		)		(167,022		)		(271,558		)
Total equity (deficit)		(187,879		)		108,591				140,361				(37,373		)		(211,579		)		(187,879		)	Noncontrolling interest		(14,673		)		—				—				—				—				(14,673		)
Total liabilities and shareholders’ deficit		$	319,819			$	180,684			$	299,501			$	387,328			$	(240,647	)		$	946,685		Total equity (deficit)		(286,231		)		117,848				143,329				(94,155		)		(167,022		)		(286,231		)
																									Total liabilities and shareholders’ deficit		$	282,499			$	189,599			$	302,626			$	396,803			$	(235,412	)		$	936,115
Supplemental Consolidating Statement of Operations Information	'																									'
	CONSOLIDATING STATEMENTS OF OPERATIONS(1)																									CONSOLIDATING STATEMENTS OF OPERATIONS (1)
	Three Months Ended March 31, 2014																									Year Ended December 31, 2013
	(In thousands)																									(In thousands)
		Parent/				Co-Issuer				Guarantor				Non-Guarantor				Consolidating				Total					Parent/				Co-Issuer				Guarantor				Non-Guarantor				Consolidating				Total
		Issuer								Subsidiaries				Subsidiaries				Adjustments									Issuer								Subsidiaries				Subsidiaries				Adjustments
	Revenues	$	—			$	22,012			$	64,292			$	93,898			$	—			$	180,202			Revenues	$	—			$	87,567			$	214,481			$	414,085			$	(41,447	)		$	674,686
	Costs and expenses:																									Costs and expenses:
	Cost of sales	—				16,454				50,558				71,618				—				138,630				Cost of sales	—				63,794				174,204				338,769				(41,447		)		535,320
	Depreciation, depletion and amortization	76				2,524				6,269				7,190				—				16,059				Depreciation, depletion and amortization	354				10,178				27,452				29,247				—				67,231
	Selling and administrative	3,746				894				2,994				5,697				—				13,331				Selling and administrative	12,339				3,609				11,092				23,681				—				50,721
	Heritage health benefit expenses	3,326				—				—				218				—				3,544				Heritage health benefit expenses	12,361				—				—				1,057				—				13,418
	Loss (gain) on sales of assets	—				—				(1		)		39				—				38				Loss (gain) on sales of assets	—				—				115				(189		)		—				(74		)
	Restructuring charges	—				397				—				—				—				397				Restructuring charges	—				5,078				—				—				—				5,078
	Other operating income	—				—				150				—				—				150				Other operating income	—				—				(22,367		)		(3		)		—				(22,370		)
		7,148				20,269				59,970				84,762				—				172,149					25,054				82,659				190,496				392,562				(41,447		)		649,324
	Operating income (loss)	(7,148		)		1,743				4,322				9,136				—				8,053				Operating income (loss)	(25,054		)		4,908				23,985				21,523				—				25,362
	Other income (expense):																									Other income (expense):
	Interest expense	(18,673		)		(44		)		(110		)		(1,978		)		7				(20,798		)		Interest expense	(30,417		)		(39		)		(295		)		(9,221		)		35				(39,937		)
	Interest income	123				4				25				157				(7		)		302				Loss on extinguishment of debt	(64		)		—				—				—				—				(64		)
	Loss on foreign exchange	(6,790		)		—				—				—				—				(6,790		)		Interest income	165				26				522				688				(35		)		1,366
	Other income	1				—				55				37				—				93				Other income	1				—				328				35				—				364
		(25,339		)		(40		)		(30		)		(1,784		)		—				(27,193		)			(30,315		)		(13		)		555				(8,498		)		—				(38,271		)
	Income (loss) before income taxes and income of consolidated subsidiaries	(32,487		)		1,703				4,292				7,352				—				(19,140		)		Income (loss) before income taxes and income of consolidated subsidiaries	(55,369		)		4,895				24,540				13,025				—				(12,909		)
	Equity in income of subsidiaries	13,319				—				—				—				(13,319		)		—				Equity in income of subsidiaries	42,347				—				—				—				(42,347		)		—
	Income (loss) before income taxes	(19,168		)		1,703				4,292				7,352				(13,319		)		(19,140		)		Loss before income taxes	(13,022		)		4,895				24,540				13,025				(42,347		)		(12,909		)
	Income tax expense (benefit)	(138		)		—				(1,511		)		6,626				(5,087		)		(110		)		Income tax expense (benefit)	(4,895		)		680				8,461				(47		)		(8,981		)		(4,782		)
	Net income (loss)	(19,030		)		1,703				5,803				726				(8,232		)		(19,030		)		Net income (loss)	(8,127		)		4,215				16,079				13,072				(33,366		)		(8,127		)
	Less net loss attributable to noncontrolling interest	—				—				—				—				—				—				Less net loss attributable to noncontrolling interest	(3,430		)		—				—				—				—				(3,430		)
	Net income (loss) attributable to the Parent company	$	(19,030	)		$	1,703			$	5,803			$	726			$	(8,232	)		$	(19,030	)		Net income (loss) attributable to the Parent company	$	(4,697	)		$	4,215			$	16,079			$	13,072			$	(33,366	)		$	(4,697	)
	____________________																									____________________
	(1)    This table is presented for historical information and presents WML and its subsidiaries as non-guarantor subsidiaries. WML and its subsidiaries became additional guarantor subsidiaries effective on July 31, 2014.																									(1)    This table is presented for historical information and presents WML and its subsidiaries as non-guarantor subsidiaries. WML and its subsidiaries became additional guarantor subsidiaries effective on July 31, 2014.
	CONSOLIDATING STATEMENTS OF OPERATIONS(1)																									CONSOLIDATING STATEMENTS OF OPERATIONS (1)
	Three Months Ended March 31, 2013																									Year Ended December 31, 2012
	(In thousands)																									(In thousands)
		Parent/				Co-Issuer				Guarantor				Non-Guarantor				Consolidating				Total					Parent/				Co-Issuer				Guarantor				Non-Guarantor				Consolidating				Total
		Issuer								Subsidiaries				Subsidiaries				Adjustments									Issuer								Subsidiaries				Subsidiaries				Adjustments
	Revenues	$	—			$	19,336			$	50,687			$	100,401			$	(8,976	)		$	161,448			Revenues	$	—			$	81,285			$	184,506			$	366,105			$	(31,459	)		$	600,437
	Costs and expenses:																									Costs and expenses:
	Cost of sales	—				16,954				40,421				82,022				(8,976		)		130,421				Cost of sales	—				59,299				134,683				303,998				(31,459		)		466,521
	Depreciation, depletion and amortization	94				2,531				5,189				6,612				—				14,426				Depreciation, depletion and amortization	421				10,085				19,571				27,068				—				57,145
	Selling and administrative	3,054				855				2,637				5,341				—				11,887				Selling and administrative	13,748				3,657				9,993				24,037				(1,527		)		49,908
	Heritage health benefit expenses	3,689				—				—				262				—				3,951				Heritage health benefit expenses	12,406				—				—				982				—				13,388
	Gain on sales of assets	—				—				(133		)		(101		)		—				(234		)		Loss on sales of assets	13				—				251				264				—				528
	Other operating income	—				—				(4,737		)		—				—				(4,737		)		Other operating income	—				—				(17,452		)		—				1,527				(15,925		)
		6,837				20,340				43,377				94,136				(8,976		)		155,714					26,588				73,041				147,046				356,349				(31,459		)		571,565
	Operating income (loss)	(6,837		)		(1,004		)		7,310				6,265				—				5,734				Operating income (loss)	(26,588		)		8,244				37,460				9,756				—				28,872
	Other income (expense):																									Other income (expense):
	Interest expense	(7,584		)		(10		)		(74		)		(2,500		)		8				(10,160		)		Interest expense	(31,301		)		(39		)		(378		)		(11,039		)		80				(42,677		)
	Interest income	30				10				44				221				(8		)		297				Loss on extinguishment of debt	(1,986		)		—				—				—				—				(1,986		)
	Other income (loss)	—				—				92				(22		)		—				70				Interest income	253				15				294				1,014				(80		)		1,496
		(7,554		)		—				62				(2,301		)		—				(9,793		)		Other income	190				—				395				138				—				723
	Income (loss) before income taxes and income of consolidated subsidiaries	(14,391		)		(1,004		)		7,372				3,964				—				(4,059		)			(32,844		)		(24		)		311				(9,887		)		—				(42,444		)
	Equity in income of subsidiaries	10,304				—				—				—				(10,304		)		—				Income (loss) before income taxes and income of consolidated subsidiaries	(59,432		)		8,220				37,771				(131		)		—				(13,572		)
	Income (loss) before income taxes	(4,087		)		(1,004		)		7,372				3,964				(10,304		)		(4,059		)		Equity in income of subsidiaries	45,762				—				—				—				(45,762		)		—
	Income tax expense (benefit)	—				—				496				2,823				(3,291		)		28				Income (loss) before income taxes	(13,670		)		8,220				37,771				(131		)		(45,762		)		(13,572		)
	Net income (loss)	(4,087		)		(1,004		)		6,876				1,141				(7,013		)		(4,087		)		Income tax expense (benefit)	(8		)		107				—				4,410				(4,419		)		90
	Less net loss attributable to noncontrolling interest	(1,702		)		—				—				—				—				(1,702		)		Net income (loss)	(13,662		)		8,113				37,771				(4,541		)		(41,343		)		(13,662		)
	Net income (loss) attributable to the Parent company	$	(2,385	)		$	(1,004	)		$	6,876			$	1,141			$	(7,013	)		$	(2,385	)		Less net loss attributable to noncontrolling interest	(6,436		)		—				—				—				—				(6,436		)
																										Net income (loss) attributable to the Parent company	$	(7,226	)		$	8,113			$	37,771			$	(4,541	)		$	(41,343	)		$	(7,226	)
																										____________________
																										(1)    This table is presented for historical information and presents WML and its subsidiaries as non-guarantor subsidiaries. WML and its subsidiaries became additional guarantor subsidiaries effective on July 31, 2014.
																										CONSOLIDATING STATEMENTS OF OPERATIONS (1)
																										Year Ended December 31, 2011
																									(In thousands)
																										Parent/				Co-Issuer				Guarantor				Non-Guarantor				Consolidating				Total
																										Issuer								Subsidiaries				Subsidiaries				Adjustments
																									Revenues	$	—			$	86,785			$	58,544			$	411,908			$	(55,524	)		$	501,713
																									Costs and expenses:
																									Cost of sales	—				60,243				49,439				338,629				(55,524		)		392,787
																									Depreciation, depletion and amortization	306				10,175				7,936				27,177				—				45,594
																									Selling and administrative	10,616				4,059				4,566				21,508				(473		)		40,276
																									Heritage health benefit expenses	17,754				—				—				821				—				18,575
																									Gain (loss) on sales of assets	3				189				59				389				—				640
																									Other operating income	—				—				(7,258		)		—				473				(6,785		)
																										28,679				74,666				54,742				388,524				(55,524		)		491,087
																									Operating income (loss)	(28,679		)		12,119				3,802				23,384				—				10,626
																									Other income (expense):
																									Interest expense	(16,365		)		(469		)		(657		)		(12,370		)		92				(29,769		)
																									Loss on extinguishment of debt	(7,873		)		(9,073		)		(84		)		—				—				(17,030		)
																									Interest income	266				14				206				1,050				(92		)		1,444
																									Other income (loss)	(3,014		)		—				170				272				—				(2,572		)
																										(26,986		)		(9,528		)		(365		)		(11,048		)		—				(47,927		)
																									Loss before income taxes and income of consolidated subsidiaries	(55,665		)		2,591				3,437				12,336				—				(37,301		)
																									Equity in income of subsidiaries	18,508				—				—				—				(18,508		)		—
																									Loss before income taxes	(37,157		)		2,591				3,437				12,336				(18,508		)		(37,301		)
																									Income tax expense (benefit)	(282		)		(2,498		)		(26		)		7,263				(4,883		)		(426		)
																									Net income (loss)	(36,875		)		5,089				3,463				5,073				(13,625		)		(36,875		)
																									Less net loss attributable to noncontrolling interest	(3,775		)		—				—				—				—				(3,775		)
																									Net loss attributable to the Parent company	$	(33,100	)		$	5,089			$	3,463			$	5,073			$	(13,625	)		$	(33,100	)
Supplemental Consolidating Statements of Comprehensive Income (Loss)	'																									'
	CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS)(1)																									CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) (1)
	Three Months Ended March 31, 2014																									Year Ended December 31, 2013
	(In thousands)																									(In thousands)
		Parent/Issuer				Co-Issuer				Guarantor				Non-Guarantor				Consolidating				Total					Parent/Issuer				Co-Issuer				Guarantor				Non-Guarantor				Consolidating				Total
										Subsidiaries				Subsidiaries				Adjustments																	Subsidiaries				Subsidiaries				Adjustments
	Net income (loss)	$	(19,030	)		$	1,703			$	5,803			$	726			$	(8,232	)		$	(19,030	)
																										Net income (loss)	$	(8,127	)		$	4,215			$	16,079			$	13,072			$	(33,366	)		$	(8,127	)
	Other comprehensive income (loss)
	Amortization of accumulated actuarial gains or losses, pension	359				2				—				128				(130		)		359				Other comprehensive income (loss)
																										Amortization of accumulated actuarial gains or losses, pension	3,490				28				—				863				(891		)		3,490
	Amortization of accumulated actuarial gains or losses, transition obligations, and prior service costs, postretirement medical benefit	5				—				(119		)		88				31				5
																										Adjustments to accumulated actuarial losses and transition obligations, pension	28,974				180				10,554				3,252				(13,986		)		28,974
	Tax effect of other comprehensive income gains	(138		)		—				—				—				—				(138		)
																										Amortization of accumulated actuarial gains or losses, transition obligations, and prior service costs, postretirement medical benefit	4,005				—				—				852				(852		)		4,005
	Other comprehensive income (loss)	226				2				(119		)		216				(99		)		226
																										Adjustments to accumulated actuarial gains and transition obligations, postretirement medical benefits	53,230				—				11,941				5,411				(17,352		)		53,230
	Comprehensive income (loss) attributable to the Parent company	$	(18,804	)		$	1,705			$	5,684			$	942			$	(8,331	)		$	(18,804	)
																										Tax effect of other comprehensive income gains	(4,892		)		—				—				—				—				(4,892		)
	____________________
	(1)    This table is presented for historical information and presents WML and its subsidiaries as non-guarantor subsidiaries. WML and its subsidiaries became additional guarantor subsidiaries effective on July 31, 2014.																									Unrealized and realized gains and losses on available-for-sale securities	(57		)		—				(17		)		(38		)		55				(57		)
	CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS)(1)																									Other comprehensive income	84,750				208				22,478				10,340				(33,026		)		84,750
	Three Months Ended March 31, 2013
	(In thousands)																									Comprehensive income attributable to Westmoreland Coal Company	$	76,623			$	4,423			$	38,557			$	23,412			$	(66,392	)		$	76,623
																										____________________
		Parent/Issuer				Co-Issuer				Guarantor				Non-Guarantor				Consolidating				Total				(1)    This table is presented for historical information and presents WML and its subsidiaries as non-guarantor subsidiaries. WML and its subsidiaries became additional guarantor subsidiaries effective on July 31, 2014.
										Subsidiaries				Subsidiaries				Adjustments
	Net income (loss)	$	(4,087	)		$	(1,004	)		$	6,876			$	1,141			$	(7,013	)		$	(4,087	)
	Other comprehensive income (loss)
	Amortization of accumulated actuarial gains or losses, pension	741				6				—				193				(199		)		741				CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) (1)
																										Year Ended December 31, 2012
	Amortization of accumulated actuarial gains or losses, transition obligations, and prior service costs, postretirement medical benefit	1,001				—				—				213				(213		)		1,001				(In thousands)
	Other comprehensive income (loss)	1,742				6				—				406				(412		)		1,742
	Comprehensive income (loss) attributable to the Parent company	$	(2,345	)		$	(998	)		$	6,876			$	1,547			$	(7,425	)		$	(2,345	)			Parent/Issuer				Co-Issuer				Guarantor				Non-Guarantor				Consolidating				Total
																																			Subsidiaries				Subsidiaries				Adjustments
																										Net income (loss)	$	(13,662	)		$	8,113			$	37,771			$	(4,541	)		$	(41,343	)		$	(13,662	)
																										Other comprehensive income (loss)
																										Amortization of accumulated actuarial gains or losses, pension	2,960				23				—				766				(789		)		2,960
																										Adjustments to accumulated actuarial losses and transition obligations, pension	(9,812		)		(52		)		(3,034		)		(2,132		)		5,218				(9,812		)
																										Amortization of accumulated actuarial gains or losses, transition obligations, and prior service costs, postretirement medical benefit	2,572				—				—				973				(973		)		2,572
																										Adjustments to accumulated actuarial gains and transition obligations, postretirement medical benefits	(22,342		)		—				(1,969		)		(865		)		2,834				(22,342		)
																										Unrealized and realized gains and losses on available-for-sale securities	(268		)		—				1				(65		)		64				(268		)
																										Other comprehensive income	(26,890		)		(29		)		(5,002		)		(1,323		)		6,354				(26,890		)
																										Comprehensive income (loss) attributable to Westmoreland Coal Company	$	(40,552	)		$	8,084			$	32,769			$	(5,864	)		$	(34,989	)		$	(40,552	)
																										____________________
																										(1)    This table is presented for historical information and presents WML and its subsidiaries as non-guarantor subsidiaries. WML and its subsidiaries became additional guarantor subsidiaries effective on July 31, 2014.
																										CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) (1)
																										Year Ended December 31, 2011
																										(In thousands)
																											Parent/Issuer				Co-Issuer				Guarantor				Non-Guarantor				Consolidating				Total
																																			Subsidiaries				Subsidiaries				Adjustments
																										Net income (loss)	$	(36,875	)		$	5,089			$	3,463			$	5,073			$	(13,625	)		$	(36,875	)
																										Other comprehensive income (loss)
																										Amortization of accumulated actuarial gains or losses, pension	1,647				9				—				702				(711		)		1,647
																										Adjustments to accumulated actuarial losses and transition obligations, pension	(15,798		)		(150		)		—				(444		)		594				(15,798		)
																										Amortization of accumulated actuarial gains or losses, transition obligations, and prior service costs, postretirement medical benefit	(288		)		—				—				295				(295		)		(288		)
																										Adjustments to accumulated actuarial gains and transition obligations, postretirement medical benefits	(49,136		)		—				—				(9,269		)		9,269				(49,136		)
																										Unrealized and realized gains and losses on available-for-sale securities	(200		)		—				(103		)		(100		)		203				(200		)
																										Other comprehensive income	(63,775		)		(141		)		(103		)		(8,816		)		9,060				(63,775		)
																										Comprehensive income (loss) attributable to Westmoreland Coal Company	$	(100,650	)		$	4,948			$	3,360			$	(3,743	)		$	(4,565	)		$	(100,650	)
																										____________________
																										(1)    This table is presented for historical information and presents WML and its subsidiaries as non-guarantor subsidiaries. WML and its subsidiaries became additional guarantor subsidiaries effective on July 31, 2014.
Supplemental Consolidating Statement of Cash Flow Information	'																									'
	CONSOLIDATING STATEMENTS OF CASH FLOWS(1)																									CONSOLIDATING STATEMENTS OF CASH FLOWS (1)
	Three Months Ended March 31, 2014																									Year Ended December 31, 2013
	(In thousands)																									(In thousands)
	Statements of Cash Flows		Parent/				Co-Issuer				Guarantor				Non-Guarantor				Consolidating				Total			Statements of Cash Flows		Parent/				Co-Issuer				Guarantor				Non-Guarantor				Consolidating				Total
			Issuer								Subsidiaries				Subsidiaries				Adjustments									Issuer								Subsidiaries				Subsidiaries				Adjustments
	Cash flows from operating activities:																									Cash flows from operating activities:
	Net income (loss)		$	(19,030	)		$	1,703			$	5,803			$	726			$	(8,232	)		$	(19,030	)	Net income (loss)		$	(8,127	)		$	4,215			$	16,079			$	13,072			$	(33,366	)		$	(8,127	)
	Adjustments to reconcile net income (loss) to net cash provided by operating activities:																									Adjustments to reconcile net income (loss) to net cash provided by operating activities:
	Equity in income of subsidiaries		(13,319		)		—				—				—				13,319				—			Equity in income of subsidiaries		(42,347		)		—				—				—				42,347				—
	Depreciation, depletion, and amortization		76				2,524				6,269				7,190				—				16,059			Depreciation, depletion, and amortization		354				10,178				27,452				29,247				—				67,231
	Accretion of asset retirement obligation and receivable		—				18				1,278				2,183				—				3,479			Accretion of asset retirement obligation and receivable		—				63				4,192				8,426				—				12,681
	Non-cash tax benefits		(138		)		—				—				—				—				(138		)	Non-cash tax benefits		(4,892		)		—				—				—				—				(4,892		)
	Amortization of intangible assets and liabilities, net		—				146				—				7				—				153			Amortization of intangible assets and liabilities, net		—				622				—				43				—				665
	Share-based compensation		569				7				37				115				—				728			Share-based compensation		2,437				37				914				1,934				—				5,322
	Loss (gain) on sales of assets		—				—				(1		)		39				—				38			Loss on sale of assets		—				—				115				(189		)		—				(74		)
	Amortization of deferred financing costs		149				—				—				122				—				271			Amortization of deferred financing costs		3,165				—				49				517				—				3,731
	Loss on foreign exchange		6,790				—				—				—				—				6,790			Other		—				—				(1,001		)		—				—				(1,001		)
	Changes in operating assets and liabilities:																									Loss on extinguishment of debt		64				—				—				—				—				64
	Receivables, net		(178		)		480				(2,738		)		6,104				1,534				5,202
																										Gain on sales of investments		—				—				19				(22		)		—				(3		)
	Inventories		—				4,316				944				(735		)		—				4,525
																										Changes in operating assets and liabilities:
	Excess of black lung benefit obligation over trust assets		701				—				—				—				—				701			Receivables, net		(18		)		(126		)		9,871				(4,069		)		(13,294		)		(7,636		)
	Accounts payable and accrued expenses		5,670				(3,386		)		7,356				1,327				(8		)		10,959			Inventories		—				(3,114		)		187				415				—				(2,512		)
	Deferred revenue		—				(2,415		)		844				269				—				(1,302		)	Excess of black lung benefit obligation over trust assets		319				—				—				—				—				319
	Income tax payable		—				—				—				28				—				28			Accounts payable and accrued expenses		(613		)		5,141				4,082				(9,852		)		14,821				13,579
	Accrual for workers’ compensation		(69		)		—				—				—				—				(69		)	Deferred revenue		—				(8,706		)		972				(1,344		)		—				(9,078		)
	Asset retirement obligations		—				—				(9		)		(1,343		)		—				(1,352		)	Income tax payable		—				—				(1,679		)		1,678				—				(1		)
	Accrual for postretirement medical benefits		(374		)		—				935				345				—				906			Accrual for workers’ compensation		(2,069		)		—				—				—				—				(2,069		)
	Pension and SERP obligations		83				1				113				(490		)		—				(293		)	Asset retirement obligations		—				—				(1,971		)		(7,439		)		—				(9,410		)
	Other assets and liabilities		(183		)		(309		)		(1,616		)		(2,880		)		6,981				1,993			Accrual for postretirement medical benefits		101				—				5,620				2,000				—				7,721
	Distributions received from subsidiaries		42,500				—				—				—				(42,500		)		—			Pension and SERP obligations		1,391				18				589				390				—				2,388
	Net cash provided by (used in) operating activities		23,247				3,085				19,215				13,007				(28,906		)		29,648			Other assets and liabilities		(144		)		4,983				8,206				4,124				(5,350		)		11,819
	Cash flows from investing activities:																									Distributions received from subsidiaries		78,000				—				—				—				(78,000		)		—
	Additions to property, plant and equipment		38				(35		)		(2,609		)		(444		)		—				(3,050		)
																										Net cash provided by (used in) operating activities		27,621				13,311				73,696				38,931				(72,842		)		80,717
	Change in restricted investments and bond collateral and reclamation deposits		(471,151		)		5,998				4				(395		)		—				(465,544		)
																										Cash flows from investing activities:
																										Additions to property, plant and equipment		(737		)		(790		)		(17,156		)		(9,908		)		—				(28,591		)
	Receivable from customer for property and equipment purchases		—				—				—				(10		)		—				(10		)	Change in restricted investments and bond collateral and reclamation deposits		49				(8		)		1,766				(373		)		—				1,434
	Other		—				—				—				(60		)		—				(60		)	Net proceeds from sales of assets		—				—				534				368				—				902
	Net cash provided by (used in) investing activities		(471,113		)		5,963				(2,605		)		(909		)		—				(468,664		)
	Cash flows from financing activities:																									Proceeds from the sale of restricted investments		—				—				788				7,499				—				8,287
	Change in book overdrafts		—				—				(317		)		2				—				(315		)
																										Receivable from customer for property and equipment purchases		—				—				—				(389		)		—				(389		)
	Borrowings from long-term debt		454,219				—				—				—				—				454,219
																										Other		—				—				(2,500		)		(1,040		)		—				(3,540		)
	Repayments of long-term debt		—				—				(875		)		(5,364		)		—				(6,239		)
																										Net cash provided by (used in) investing activities		(688		)		(798		)		(16,568		)		(3,843		)		—				(21,897		)
	Debt issuance costs and other refinancing costs		(7,598		)		—				—				—				—				(7,598		)
																										Cash flows from financing activities:
	Dividends/distributions		(261		)		(8,500		)		(18,000		)		(16,000		)		42,500				(261		)	Change in book overdrafts		—				—				310				—				—				310
	Transactions with Parent/affiliates		4,939				154				3,434				5,067				(13,594		)		—			Repayments of long-term debt		(500		)		—				(2,322		)		(25,266		)		—				(28,088		)
	Net cash provided by (used in) financing activities		451,299				(8,346		)		(15,758		)		(16,295		)		28,906				439,806			Borrowings on revolving lines of credit		—				—				—				7,000				—				7,000
	Net increase (decrease) in cash and cash equivalents		3,433				702				852				(4,197		)		—				790			Repayments on revolving lines of credit		—				—				—				(7,000		)		—				(7,000		)
	Cash and cash equivalents, beginning of period		25,326				3,341				7,942				24,501				—				61,110			Debt issuance costs and other refinancing costs		(26		)		—				—				(156		)		—				(182		)
	Cash and cash equivalents, end of period		$	28,759			$	4,043			$	8,794			$	20,304			$	—			$	61,900		Dividends/distributions		(1,360		)		(14,500		)		(44,500		)		(19,000		)		78,000				(1,360		)
	____________________																									Transactions with Parent/affiliates		(14,557		)		783				(8,036		)		26,968				(5,158		)		—
	(1)    This table is presented for historical information and presents WML and its subsidiaries as non-guarantor subsidiaries. WML and its subsidiaries became additional guarantor subsidiaries effective on July 31, 2014.
																										Net cash provided by (used in) financing activities		(16,443		)		(13,717		)		(54,548		)		(17,454		)		72,842				(29,320		)
	CONSOLIDATING STATEMENTS OF CASH FLOWS(1)
	Three Months Ended March 31, 2013																									Net increase (decrease) in cash and cash equivalents		10,490				(1,204		)		2,580				17,634				—				29,500
	(In thousands)
																									Cash and cash equivalents, beginning of year		14,836				4,545				5,362				6,867				—				31,610
																									Cash and cash equivalents, end of year		$	25,326			$	3,341			$	7,942			$	24,501			$	—			$	61,110
Statements of Cash Flows		Parent/				Co-Issuer				Guarantor				Non-Guarantor				Consolidating				Total
		Issuer								Subsidiaries				Subsidiaries				Adjustments							____________________
Cash flows from operating activities:																									(1)    This table is presented for historical information and presents WML and its subsidiaries as non-guarantor subsidiaries. WML and its subsidiaries became additional guarantor subsidiaries effective on July 31, 2014.
Net income (loss)		$	(4,087	)		$	(1,004	)		$	6,876			$	1,141			$	(7,013	)		$	(4,087	)
																									CONSOLIDATING STATEMENTS OF CASH FLOWS (1)
Adjustments to reconcile net income (loss) to net cash provided by operating activities:																									Year Ended December 31, 2012
Equity in income of subsidiaries		(10,304		)		—				—				—				10,304				—			(In thousands)
Depreciation, depletion, and amortization		94				2,531				5,189				6,612				—				14,426
Accretion of asset retirement obligation and receivable		—				16				1,050				2,114				—				3,180			Statements of Cash Flows		Parent/				Co-Issuer				Guarantor				Non-Guarantor				Consolidating				Total
																											Issuer								Subsidiaries				Subsidiaries				Adjustments
Amortization of intangible assets and liabilities, net		—				156				—				8				—				164			Cash flows from operating activities:
																									Net income (loss)		$	(13,662	)		$	8,113			$	37,771			$	(4,541	)		$	(41,343	)		$	(13,662	)
Share-based compensation		682				10				681				1,013				—				2,386
																									Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Gain on sales of assets		—				—				(133		)		(101		)		—				(234		)	Equity in income of subsidiaries		(45,762		)		—				—				—				45,762				—
Amortization of deferred financing costs		771				—				13				149				—				933			Depreciation, depletion, and amortization		421				10,085				19,571				27,068				—				57,145
Loss on sales of investment securities		—				—				7				—				—				7			Accretion of asset retirement obligation and receivable		—				59				4,038				8,092				—				12,189
Changes in operating assets and liabilities:																									Amortization of intangible assets and liabilities, net		—				622				—				36				—				658
Receivables, net		49				2,885				(2,467		)		(3,355		)		3,008				120
																									Share-based compensation		2,716				44				559				2,721				—				6,040
Inventories		—				(2,181		)		(753		)		247				—				(2,687		)
																									Loss (gain) on sale of assets		13				—				251				264				—				528
Excess of black lung benefit obligation over trust assets		83				—				—				—				—				83
																									Amortization of deferred financing costs		2,889				—				847				622				—				4,358
Accounts payable and accrued expenses		(8,202		)		5,960				(10		)		6,979				(1,482		)		3,245
																									Loss on extinguishment of debt		1,986				—				—				—				—				1,986
Deferred revenue		—				(1,927		)		1,703				384				—				160
																									Gain on sales of investments		(190		)		—				—				25				—				(165		)
Income tax payable		—				—				(1,679		)		1,706				—				27
																									Changes in operating assets and liabilities:
Accrual for workers’ compensation		(191		)		—				—				—				—				(191		)	Receivables, net		147				(151		)		(20,910		)		102				7,957				(12,855		)
Asset retirement obligations		—				—				(190		)		(3,017		)		—				(3,207		)	Inventories		—				709				(2,389		)		(484		)		—				(2,164		)
Accrual for postretirement medical benefits		(100		)		—				1,478				607				—				1,985			Excess of black lung benefit obligation over trust assets		1,791				—				—				—				—				1,791
Pension and SERP obligations		320				4				177				241				—				742			Accounts payable and accrued expenses		4,981				(3,209		)		18,396				5,453				(8,222		)		17,399
Other assets and liabilities		(187		)		465				(195		)		4,081				—				4,164			Deferred revenue		—				(8,312		)		772				(658		)		—				(8,198		)
Distributions received from subsidiaries		19,600				—				—				—				(19,600		)		—			Accrual for workers’ compensation		(2,096		)		—				—				—				—				(2,096		)
Net cash provided by (used in) operating activities		(1,472		)		6,915				11,747				18,809				(14,783		)		21,216			Asset retirement obligations		—				—				(1,198		)		(5,745		)		—				(6,943		)
Cash flows from investing activities:																									Accrual for postretirement medical benefits		(524		)		—				4,858				1,857				—				6,191
Additions to property, plant and equipment		(157		)		(134		)		(4,224		)		(786		)		—				(5,301		)
																									Pension and SERP obligations		1,286				15				709				792				—				2,802
Change in restricted investments and bond collateral and reclamation deposits		(398		)		(3		)		(151		)		(5,883		)		—				(6,435		)
																									Other assets and liabilities		(243		)		(536		)		1,047				(10,128		)		2,000				(7,860		)
Net proceeds from sales of assets		—				—				309				132				—				441
																									Distributions received from subsidiaries		31,971				—				—				—				(31,971		)		—
Proceeds from the sale of investments		—				—				120				5,499				—				5,619
																									Net cash provided by (used in) operating activities		(14,276		)		7,439				64,322				25,476				(25,817		)		57,144
																									Cash flows from investing activities:
Receivable from customer for property and equipment purchases		—				—				—				(49		)		—				(49		)	Additions to property, plant and equipment		(159		)		(2,067		)		(8,385		)		(10,421		)		—				(21,032		)
Net cash provided by (used in) investing activities		(555		)		(137		)		(3,946		)		(1,087		)		—				(5,725		)	Change in restricted investments and bond collateral and reclamation deposits		(3,248		)		(7		)		(27,504		)		(3,133		)		—				(33,892		)
Cash flows from financing activities:																									Cash payments related to acquisitions and other		4,000				—				(76,522		)		—				—				(72,522		)
Change in book overdrafts		—				—				(7		)		827				—				820
																									Net proceeds from sales of assets		—				—				240				240				—				480
Repayments of long-term debt		—				—				(713		)		(5,860		)		—				(6,573		)
																									Proceeds from the sale of restricted investments		1,581				—				1,889				636				—				4,106
Borrowings on revolving lines of credit		—				—				—				6,000				—				6,000
																									Receivable from customer for property and equipment purchases		—				—				—				(674		)		—				(674		)
Repayments on revolving lines of credit		—				—				—				(6,000		)		—				(6,000		)
Debt issuance costs and other refinancing costs		—				—				—				(156		)		—				(156		)
																									Net cash provided by (used in) investing activities		2,174				(2,074		)		(110,282		)		(13,352		)		—				(123,534		)
Dividends/distributions		(340		)		(6,500		)		(8,000		)		(5,100		)		19,600				(340		)
																									Cash flows from financing activities:
Transactions with Parent/affiliates		(22,106		)		(16		)		2,255				4,076				15,791				—			Change in book overdrafts		—				(259		)		6				—				—				(253		)
Net cash provided by (used in) financing activities		(22,446		)		(6,516		)		(6,465		)		(6,213		)		35,391				(6,249		)	Borrowings from long-term debt		119,364				—				—				—				—				119,364
Net increase (decrease) in cash and cash equivalents		(24,473		)		262				1,336				11,509				20,608				9,242			Repayments of long-term debt		(23,000		)		—				(2,494		)		(19,352		)		—				(44,846		)
Cash and cash equivalents, beginning of period		14,836				4,545				5,362				6,867				—				31,610			Borrowings on revolving lines of credit		—				—				—				16,500				—				16,500
Cash and cash equivalents, end of period		$	(9,637	)		$	4,807			$	6,698			$	18,376			$	20,608			$	40,852		Repayments on revolving lines of credit		—				—				—				(16,500		)		—				(16,500		)
																									Debt issuance costs and other refinancing costs		(5,666		)		—				—				(22		)		—				(5,688		)
																									Dividends/distributions		(1,360		)		(1,050		)		(19,173		)		(11,748		)		31,971				(1,360		)
																									Transactions with Parent/affiliates		(88,541		)		483				72,840				21,372				(6,154		)		—
																									Net cash provided by (used in) financing activities		797				(826		)		51,179				(9,750		)		25,817				67,217
																									Net increase (decrease) in cash and cash equivalents		(11,305		)		4,539				5,219				2,374				—				827
																									Cash and cash equivalents, beginning of year		26,141				6				143				4,493				—				30,783
																									Cash and cash equivalents, end of year		$	14,836			$	4,545			$	5,362			$	6,867			$	—			$	31,610
																									____________________
																									(1)    This table is presented for historical information and presents WML and its subsidiaries as non-guarantor subsidiaries. WML and its subsidiaries became additional guarantor subsidiaries effective on July 31, 2014.
																									CONSOLIDATING STATEMENTS OF CASH FLOWS (1)
																									Year Ended December 31, 2011
																									(In thousands)
																									Statements of Cash Flows		Parent/				Co-Issuer				Guarantor				Non-Guarantor				Consolidating				Total
																											Issuer								Subsidiaries				Subsidiaries				Adjustments
																									Cash flows from operating activities:
																									Net loss		$	(36,875	)		$	5,089			$	3,463			$	5,073			$	(13,625	)		$	(36,875	)
																									Adjustments to reconcile net loss to net cash provided by operating activities:
																									Equity in income of subsidiaries		(18,508		)		—				—				—				18,508				—
																									Depreciation, depletion, and amortization		306				10,175				7,936				27,177				—				45,594
																									Accretion of asset retirement obligation and receivable		—				55				3,034				7,789				—				10,878
																									Amortization of intangible assets and liabilities, net		—				621				—				36				—				657
																									Share-based compensation		1,671				32				249				2,769				—				4,721
																									Loss (gain) on sale of assets		3				189				59				389				—				640
																									Amortization of deferred financing costs		1,485				(21		)		383				668				—				2,515
																									Loss on extinguishment of debt		7,873				9,073				84				—				—				17,030
																									Gain on sales of investments		—				—				(75		)		(75		)		—				(150		)
																									Loss on derivative instruments		3,079				—				—				—				—				3,079
																									Changes in operating assets and liabilities:
																									Receivables, net		(158		)		1,479				(4,343		)		2,263				6,250				5,491
																									Inventories		—				(1,820		)		134				(439		)		—				(2,125		)
																									Excess of black lung benefit obligation over trust assets		4,319				—				—				—				—				4,319
																									Accounts payable and accrued expenses		5,849				(1,063		)		378				3,103				(4,139		)		4,128
																									Deferred revenue		—				(8,774		)		(349		)		(795		)		—				(9,918		)
																									Accrual for workers’ compensation		1,248				—				—				—				—				1,248
																									Asset retirement obligations		—				—				(875		)		(5,635		)		—				(6,510		)
																									Accrual for postretirement medical benefits		(2,878		)		—				—				1,235				—				(1,643		)
																									Pension and SERP obligations		(4,320		)		(50		)		—				3,092				—				(1,278		)
																									Other assets and liabilities		444				(529		)		3,839				(392		)		(428		)		2,934
																									Distributions received from subsidiaries		23,400				—				—				—				(23,400		)		—
																									Net cash provided by (used in) operating activities		(13,062		)		14,456				13,917				46,258				(16,834		)		44,735
																									Cash flows from investing activities:
																									Additions to property, plant and equipment		(797		)		(2,119		)		(2,569		)		(22,109		)		—				(27,594		)
																									Change in restricted investments and bond collateral and reclamation deposits		(1,714		)		2,581				(3,738		)		(3,115		)		—				(5,986		)
																									Cash payments related to acquisitions and other		(4,000		)		—				—				—				—				(4,000		)
																									Net proceeds from sales of assets		—				—				250				437				—				687
																									Proceeds from the sale of investments		—				—				1,075				2,275				—				3,350
																									Receivable from customer for property and equipment purchases		—				—				—				(96		)		—				(96		)
																									Net cash provided by (used in) investing activities		(6,511		)		462				(4,982		)		(22,608		)		—				(33,639		)
																									Cash flows from financing activities:
																									Change in book overdrafts		(146		)		259				(694		)		(143		)		—				(724		)
																									Borrowings from long-term debt		142,500				—				—				—				—				142,500
																									Repayments of long-term debt		(2,532		)		(46,220		)		(11,982		)		(12,832		)		—				(73,566		)
																									Borrowings on revolving lines of credit		—				1,500				12,200				73,500				—				87,200
																									Repayments on revolving lines of credit		—				(1,500		)		(29,100		)		(75,000		)		—				(105,600		)
																									Debt issuance costs		(6,042		)		(9,077		)		100				—				—				(15,019		)
																									Exercise of stock options		422				—				—				—				—				422
																									Dividends/distributions		(21,301		)		(10,700		)		—				(12,700		)		23,400				(21,301		)
																									Transactions with Parent/affiliates		(67,458		)		49,946				20,684				3,394				(6,566		)		—
																									Net cash provided by (used in) financing activities		45,443				(15,792		)		(8,792		)		(23,781		)		16,834				13,912
																									Net increase (decrease) in cash and cash equivalents		25,870				(874		)		143				(131		)		—				25,008
																									Cash and cash equivalents, beginning of year		271				880				—				4,624				—				5,775
																									Cash and cash equivalents, end of year		$	26,141			$	6			$	143			$	4,493			$	—			$	30,783

BASIS_OF_PRESENTATION_Sherritt

BASIS OF PRESENTATION - Sherritt Acquisition (Details) (USD $)	3 Months Ended		12 Months Ended			0 Months Ended	3 Months Ended	12 Months Ended
	Mar. 31, 2014	Mar. 31, 2013	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Dec. 24, 2013	Mar. 31, 2014	Dec. 31, 2013
						Sherritt International Corporation [Member]	Sherritt International Corporation [Member]	Sherritt International Corporation [Member]
						mines
Business Acquisition [Line Items]	'	'	'	'	'	'	'	'
Number of mines	'	'	'	'	'	7	'	'
Percentage of voting interests acquired	'	'	'	'	'	50.00%	'	'
Purchase price	'	'	'	'	'	$435,000,000	'	'
Cash consideration	'	'	'	'	'	293,000,000	'	'
Assumption of capital lease obligation	'	'	'	'	'	142,000,000	'	'
Acquisition-related costs	'	'	'	'	'	'	18,100,000	2,900,000
Loss on foreign exchange	-6,790,000	0	'	'	'	'	6,800,000	'
Interest Expense, Debt	'	'	'	'	'	'	6,100,000	'
Interest Expense	20,798,000	10,160,000	39,937,000	42,677,000	29,769,000	'	4,900,000	'
Other Expenses	'	'	'	'	'	'	$300,000	'

BASIS_OF_PRESENTATION_Debt_Obl

BASIS OF PRESENTATION - Debt Obligations (Details) (USD $)

3 Months Ended

12 Months Ended

3 Months Ended

Mar. 31, 2014

Dec. 31, 2013

Dec. 31, 2012

Mar. 31, 2014

Dec. 31, 2013

Dec. 31, 2012

Mar. 31, 2014

Dec. 31, 2013

Dec. 31, 2012

Jun. 29, 2012

Feb. 04, 2011

Mar. 31, 2013

Mar. 31, 2014

Term Debt [Member]

Term Debt [Member]

Term Debt [Member]

Senior secured notes

Senior secured notes

Senior secured notes

Senior secured notes

Senior secured notes

Other operating income

Senior Notes Due 2018

Debt Instrument [Line Items]

'

'

'

'

'

'

'

'

'

'

'

'

'

Debt arrangements

$800,231,000

$339,837,000

$360,989,000

$81,000,000

$85,500,000

$103,500,000

$251,500,000

$251,500,000

$252,000,000

'

'

'

'

Business interruption insurance proceeds recorded in income

'

16,200,000

17,300,000

'

'

'

'

'

'

'

'

4,800,000

'

Cash proceeds from business interruption insurance

4,600,000

'

'

'

'

'

'

'

'

'

'

'

'

Secured senior note

'

'

'

'

'

'

'

'

'

'

'

'

$425,000,000

Stated interest rate (percent)

'

'

'

8.02%

'

'

10.75%

'

'

10.75%

10.75%

'

10.75%

SUMMARY_OF_SIGNIFICANT_ACCOUNT3

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Acquisition and subsequent event) (Details) (USD $)

3 Months Ended

0 Months Ended

3 Months Ended

12 Months Ended

0 Months Ended

Mar. 31, 2014

Mar. 31, 2013

Dec. 24, 2013

Mar. 31, 2014

Dec. 31, 2013

Mar. 31, 2014

Dec. 31, 2013

Dec. 24, 2013

Dec. 24, 2013

Dec. 24, 2013

Dec. 31, 2013

Dec. 24, 2013

Feb. 07, 2014

Jan. 10, 2014

Sherritt International Corporation [Member]

Sherritt International Corporation [Member]

Sherritt International Corporation [Member]

Senior Notes Due 2018

Revolving Credit Facility [Member]

Revolving Credit Facility [Member]

Revolving Credit Facility [Member]

Revolving Credit Facility [Member]

Letter of Credit [Member]

Letter of Credit [Member]

Subsequent Event

Subsequent Event

mines

Minimum [Member]

Maximum [Member]

Discretionary Increase [Member]

Senior Notes Due 2018

Letter of Credit [Member]

Business Acquisition [Line Items]

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Number of mines

'

'

7

'

'

'

'

'

'

'

'

'

'

'

Percentage of voting interests acquired

'

'

50.00%

'

'

'

'

'

'

'

'

'

'

'

Purchase price

'

'

$435,000,000

'

'

'

'

'

'

'

'

'

'

'

Cash consideration

'

'

293,000,000

'

'

'

'

'

'

'

'

'

'

'

Cash bonding obligation

'

'

'

'

'

'

'

'

'

'

'

'

58,000,000

'

Assumption of capital lease obligation

'

'

142,000,000

'

'

'

'

'

'

'

'

'

'

'

Acquisition-related costs

'

'

'

18,100,000

2,900,000

'

'

'

'

'

'

'

'

'

Cash transaction costs

'

'

'

'

'

'

'

'

'

'

'

'

26,000,000

'

Line of credit facility maximum borrowing capacity

'

'

'

'

'

'

20,000,000

60,000,000

70,000,000

100,000,000

2,000,000

30,000,000

'

10,000,000

Senior secured note face amount

'

'

'

'

'

425,000,000

'

'

'

'

'

'

425,000,000

'

Stated interest rate

'

'

'

'

'

10.75%

'

'

'

'

'

'

10.75%

'

Issue price (as a percent of face value)

'

'

'

'

'

'

'

'

'

'

'

'

106.88%

'

Loss on foreign exchange

($6,790,000)

$0

'

$6,800,000

'

'

'

'

'

'

'

'

'

'

SUMMARY_OF_SIGNIFICANT_ACCOUNT4

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Variable Interest Entities) (Details) (Absaloka Mine, Variable Interest Entity, Primary Beneficiary [Member], USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2013
Variable Interest Entity [Line Items]	'
Variable Interest Entity, Ownership Percentage	50.00%
Decrease to other liabilities due to cessation of operations	$19.10
Decrease to noncontrolling interest due to cessation of operations	$18.10
Subsequent Event	'
Variable Interest Entity [Line Items]	'
Variable Interest Entity, Ownership Percentage	100.00%

SUMMARY_OF_SIGNIFICANT_ACCOUNT5

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Property, Plant and Equipment) (Details)	12 Months Ended
	Dec. 31, 2013
Building and Building Improvements [Member] | Minimum [Member]	'
Property, Plant and Equipment [Line Items]	'
Estimated useful lives of property, plant and equipment	'15 years
Building and Building Improvements [Member] | Maximum [Member]	'
Property, Plant and Equipment [Line Items]	'
Estimated useful lives of property, plant and equipment	'30 years
Machinery and Equipment [Member] | Minimum [Member]	'
Property, Plant and Equipment [Line Items]	'
Estimated useful lives of property, plant and equipment	'3 years
Machinery and Equipment [Member] | Maximum [Member]	'
Property, Plant and Equipment [Line Items]	'
Estimated useful lives of property, plant and equipment	'36 years

SUMMARY_OF_SIGNIFICANT_ACCOUNT6

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Intangible Assets and Liabilities) (Details) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Accounting Policies [Abstract]	'	'	'
Amortization of intangible assets	$1,700,000	$1,700,000	$1,700,000
Amortization of intangible liabilities	1,000,000	1,000,000	1,000,000
Amortization expense (revenue):	'	'	'
2014	17,000	'	'
2015	-791,000	'	'
2016	-953,000	'	'
2017	-953,000	'	'
2018	($953,000)	'	'

SUMMARY_OF_SIGNIFICANT_ACCOUNT7

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Deferred Revenue) (Details) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Deferred Revenue Arrangement [Line Items]	'	'
Other Nonoperating Income	$16.20	$17.30
Power [Member]	'	'
Deferred Revenue Arrangement [Line Items]	'	'
Prior deferred revenue recognized	$8.70	$8.30

SUMMARY_OF_SIGNIFICANT_ACCOUNT8

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Restructuring Charges) (Details) (USD $)	3 Months Ended		12 Months Ended
	Mar. 31, 2014	Mar. 31, 2013	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Restructuring Reserve [Roll Forward]	'	'	'	'	'
Restructuring charges	$397,000	$0	$5,078,000	$0	$0
Restructuring of contracts	'	'	'	'	'
Restructuring Reserve Disclosures [Abstract]	'	'	'	'	'
Remaining Period of Contract	'	'	'5 years	'	'
Restructuring Reserve [Roll Forward]	'	'	'	'	'
Beginning balance	5,100,000	0	0	'	'
Restructuring charges	400,000	'	5,100,000	'	'
Payments for Restructuring	400,000	'	0	'	'
Ending balance	$5,100,000	'	$5,100,000	'	'

SUMMARY_OF_SIGNIFICANT_ACCOUNT9

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Antidilutive Securities Excluded from Computation of Earnings Per Share) (Details)	3 Months Ended		12 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2014	Mar. 31, 2013	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]	'	'	'	'	'
Shares excluded from diluted shares calculation	1,607	2,071	1,898	2,071	1,727
Convertible notes and securities [Member]	'	'	'	'	'
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]	'	'	'	'	'
Shares excluded from diluted shares calculation	'	'	1,093	1,093	1,093
Restricted stock units, stock options, and SARs [Member]	'	'	'	'	'
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]	'	'	'	'	'
Shares excluded from diluted shares calculation	'	'	805	978	634

Recovered_Sheet1

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Liquidity and Capital Resources) (Details) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2013	Dec. 24, 2013	Mar. 31, 2014	Jun. 29, 2012	Feb. 04, 2011	Feb. 04, 2011	Jan. 31, 2012	Dec. 31, 2013	Dec. 31, 2013	Dec. 31, 2013
	Revolving Credit Facility [Member]	Letter of Credit [Member]	Letter of Credit [Member]	10.75% Senior Notes [Member]	10.75% Senior Notes [Member]	10.75% Senior Notes [Member]	10.75% Senior Notes [Member]	10.75% Senior Notes [Member]	WRMI [Member]	Westmoreland Mining, LLC [Member]	Westmoreland Mining, LLC [Member]
							Senior Notes Issued February 4, 2011 [Member]	Senior Notes Issued January 31, 2012 [Member]			Revolving Credit Facility [Member]
Debt Instrument [Line Items]	'	'	'	'	'	'	'	'	'	'	'
Statutory minimum level of capital	'	'	'	'	'	'	'	'	$0	'	'
Senior secured note face amount	'	'	'	'	'	'	150	125	'	'	'
Line of credit facility, term	'5 years	'	'	'	'	'	'	'	'	'	'
Stated interest rate	'	'	'	10.75%	10.75%	10.75%	10.75%	'	'	'	3.75%
Line of credit facility maximum borrowing capacity	20	2	30	'	'	'	'	'	'	25	25
Letters of credit outstanding amount	'	'	'	'	'	'	'	'	'	'	1.9
Line of credit facility, available borrowing capacity	$20	'	'	'	'	'	'	'	'	'	$23.10

ACQUISITION_Summary_of_purchas

ACQUISITION - Summary of purchase consideration and allocation of purchase consideration (Details) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2012	Jun. 30, 2012
Kemmerer Mine	'	'
Business Acquisition [Line Items]	'	'
Cash bonding obligation	$24.70	'
Acquisition-related costs	1.6	'
Deferred issuance costs	5.1	'
Purchase consideration:	'	'
Cash consideration	76.5	'
Fair value of liabilities assumed:	'	'
Postretirement medical cost obligations	49.2	'
Asset retirement obligations	19.4	'
Pension obligations	15.6	'
Deferred revenue	2.2	2.2
Accrued liabilities	1.6	'
Total fair value of liabilities assumed	88	'
Total purchase consideration	164.5	'
Allocation of purchase consideration:	'	'
Inventories	9.6	'
Land and mineral rights	65.5	'
Plant and equipment	89.4	'
Total assets	164.5	'
10.75% Senior Notes [Member]	'	'
Business Acquisition [Line Items]	'	'
Senior secured note face amount	$125	'
10.75% Senior Notes [Member] | Kemmerer Mine	'	'
Business Acquisition [Line Items]	'	'
Stated interest rate	10.80%	'
Issue price (as a percent of face value)	95.50%	'

ACQUISITION_Summary_of_Pro_For

ACQUISITION - Summary of Pro Forma Information (Detail) (USD $)

3 Months Ended

12 Months Ended

In Thousands, except Per Share data, unless otherwise specified

Mar. 31, 2014

Dec. 31, 2013

Sep. 30, 2013

Jun. 30, 2013

Mar. 31, 2013

Dec. 31, 2012

Sep. 30, 2012

Jun. 30, 2012

Mar. 31, 2012

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2011

Total Revenues

'

'

'

'

'

'

'

'

'

'

'

'

As reported

$180,202

$173,947

$176,792

$162,499

$161,448

$159,027

$161,332

$132,842

$147,236

$674,686

$600,437

$501,713

Pro forma

'

'

'

'

'

'

'

'

'

'

614,550

645,595

Operating Income

'

'

'

'

'

'

'

'

'

'

'

'

As reported

8,053

-883

8,536

11,975

5,734

8,597

15,451

-4,262

9,086

25,362

28,872

10,626

Pro forma

'

'

'

'

'

'

'

'

'

'

31,146

13,275

Net income (loss) applicable to common shareholders

'

'

'

'

'

'

'

'

'

'

'

'

As reported

-19,291

-5,131

2,421

-622

-2,725

-3,963

7,282

-12,423

518

-6,057

-8,586

-34,460

Pro forma

'

'

'

'

'

'

'

'

'

'

($7,524)

($46,260)

Net income (loss) per share applicable to common shareholders

'

'

'

'

'

'

'

'

'

'

'

'

As reported (in USD per share)

($1.30)

'

'

'

($0.19)

'

'

'

'

($0.42)

($0.61)

($2.61)

Pro forma (in USD per share)

'

'

'

'

'

'

'

'

'

'

($0.54)

($3.51)

INVENTORIES_Detail

INVENTORIES (Detail) (USD $)	Mar. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified
Inventory Disclosure [Abstract]	'	'	'
Coal stockpiles	$1,189	$543	$989
Coal fuel inventories	1,844	6,161	3,048
Materials and supplies	33,189	34,233	34,954
Reserve for obsolete inventory	-775	-965	-1,257
Total	$35,447	$39,972	$37,734

RESTRICTED_INVESTMENTS_AND_BON2

RESTRICTED INVESTMENTS AND BOND COLLATERAL - Components of Restricted Investments and Bond Collateral (Detail) (USD $)	Mar. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified
Restricted Investments and Bond Collateral [Line Items]	'	'	'
Total restricted investments and bond collateral	$540,383	$75,233	$87,209
Less current portion	-16,900	-5,998	0
Total restricted investments and bond collateral, less current portion	523,483	69,235	87,209
Debt Reserve Account [Member] | Coal [Member]	'	'	'
Restricted Investments and Bond Collateral [Line Items]	'	'	'
Total restricted investments and bond collateral	13,068	13,067	13,062
Reclamation Bond Collateral [Member] | Coal [Member] | Kemmerer Mine	'	'	'
Restricted Investments and Bond Collateral [Line Items]	'	'	'
Total restricted investments and bond collateral	24,944	24,966	24,702
Reclamation Bond Collateral [Member] | Coal [Member] | Absaloka Mine	'	'	'
Restricted Investments and Bond Collateral [Line Items]	'	'	'
Total restricted investments and bond collateral	11,670	11,653	14,507
Reclamation Bond Collateral [Member] | Coal [Member] | Rosebud Mine	'	'	'
Restricted Investments and Bond Collateral [Line Items]	'	'	'
Total restricted investments and bond collateral	3,145	3,145	12,495
Reclamation Bond Collateral [Member] | Coal [Member] | Beulah Mine	'	'	'
Restricted Investments and Bond Collateral [Line Items]	'	'	'
Total restricted investments and bond collateral	1,270	1,270	1,270
Letter of Credit Account [Member] | Power [Member]	'	'	'
Restricted Investments and Bond Collateral [Line Items]	'	'	'
Total restricted investments and bond collateral	0	5,998	5,990
Postretirement Medical Benefit Bonds [Member] | Corporate [Member]	'	'	'
Restricted Investments and Bond Collateral [Line Items]	'	'	'
Total restricted investments and bond collateral	8,481	8,467	8,593
Workers' Compensation Bonds [Member] | Corporate [Member]	'	'	'
Restricted Investments and Bond Collateral [Line Items]	'	'	'
Total restricted investments and bond collateral	6,686	6,667	6,590
Proceeds From New Notes Held In Escrow [Member] | Corporate [Member]	'	'	'
Restricted Investments and Bond Collateral [Line Items]	'	'	'
Total restricted investments and bond collateral	454,219	0	'
Other Amounts Held in Escrow [Member] | Corporate [Member]	'	'	'
Restricted Investments and Bond Collateral [Line Items]	'	'	'
Total restricted investments and bond collateral	$16,900	$0	'

RESTRICTED_INVESTMENTS_AND_BON3

RESTRICTED INVESTMENTS AND BOND COLLATERAL - Carrying Value and Estimated Fair Value of Restricted Investments and Bond Collateral (Detail) (USD $)	Mar. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified
Investment [Line Items]	'	'	'
Total restricted investments and bond collateral	$540,383	$75,233	$87,209
Restricted investments and bond collateral	523,483	69,235	87,209
Carrying Value [Member]	'	'	'
Investment [Line Items]	'	'	'
Cash and cash equivalents	503,391	40,605	'
Time deposits	2,444	2,444	'
Held-to-maturity securities	34,548	32,184	'
Total restricted investments and bond collateral	'	75,233	'
Restricted investments and bond collateral	540,383	'	'
Fair Value [Member]	'	'	'
Investment [Line Items]	'	'	'
Cash and cash equivalents	503,391	40,605	'
Time deposits	2,444	2,444	'
Held-to-maturity securities	34,707	32,046	'
Total restricted investments and bond collateral	'	75,095	'
Restricted investments and bond collateral	$540,542	'	'

RESTRICTED_INVESTMENTS_AND_BON4

RESTRICTED INVESTMENTS AND BOND COLLATERAL - Amortized Cost, Gross Unrealized Holding Gains and Losses and Fair Value of Held-to-Maturity Securities (Detail) (Held-to-maturity securities, USD $)	Mar. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified
Held-to-maturity securities	'	'	'
Schedule of Held-to-maturity Securities [Line Items]	'	'	'
Amortized cost	$34,548	$32,184	$3,983
Gross unrealized holding gains	440	309	356
Gross unrealized holding losses	-281	-447	0
Fair value	$34,707	$32,046	$4,339

RESTRICTED_INVESTMENTS_AND_BON5

RESTRICTED INVESTMENTS AND BOND COLLATERAL - Maturities of Held-to-Maturity Securities (Detail) (Held-to-maturity securities, USD $)	Mar. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified
Held-to-maturity securities	'	'	'
Schedule of Held-to-maturity Securities [Line Items]	'	'	'
Within one year, Amortized cost	$1,193	$1,111	'
Due in five years or less, Amortized cost	19,539	17,839	'
Due after five years to ten years, Amortized cost	6,718	6,769	'
Due in more than ten years, Amortized cost	7,098	6,465	'
Maturities of held-to-maturity securities, Amortized cost	34,548	32,184	'
Within one year, Fair Value	1,217	1,143	'
Due in five years or less, Fair Value	19,752	17,944	'
Due after five years to ten years, Fair Value	6,717	6,665	'
Due in more than ten years, Fair Value	7,021	6,294	'
Fair value	$34,707	$32,046	$4,339

RESTRICTED_INVESTMENTS_AND_BON6

RESTRICTED INVESTMENTS AND BOND COLLATERAL - Cost Basis, Gross Unrealized Holding Gains and Fair Value of Available-for-Sale Securities (Detail) (Available-for-sale Securities [Member], USD $)	Dec. 31, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified
Available-for-sale Securities [Member]	'	'
Schedule of Available-for-sale Securities [Line Items]	'	'
Cost basis	$0	$175
Gross unrealized holding gains	0	16
Fair value	$0	$191

RESTRICTED_INVESTMENTS_AND_BON7

RESTRICTED INVESTMENTS AND BOND COLLATERAL - Additional Information (Detail) (USD $)	12 Months Ended			12 Months Ended
	Dec. 31, 2013	Mar. 31, 2014	Dec. 31, 2012	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2013	Dec. 31, 2013
				Available-for-sale Securities [Member]	Available-for-sale Securities [Member]	Available-for-sale Securities [Member]	Absaloka Mine	Rosebud Mine
Schedule of Available-for-sale Securities [Line Items]	'	'	'	'	'	'	'	'
Gain on sale of available-for-sale securities held as restricted investments and bond collateral	'	'	'	$100,000	$100,000	$100,000	'	'
Reclamation Bond Collateral Released From Restriction	'	'	'	'	'	'	3,000,000	9,400,000
Number of months required funding in debt service reserve account	'6 months	'	'	'	'	'	'	'
Letter of credit released from restriction	$5,998,000	$16,900,000	$0	'	'	'	'	'

LINES_OF_CREDIT_AND_LONGTERM_D2

LINES OF CREDIT AND LONG-TERM DEBT - Outstanding Lines of Credit and Long-Term Debt (Detail) (USD $)	Mar. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified
Debt Instrument [Line Items]	'	'	'
Total debt outstanding	$800,231	$339,837	$360,989
Less current portion	-48,586	-44,343	-23,791
Total debt outstanding, less current portion	751,645	295,494	337,198
10.75% Senior Notes [Member]	'	'	'
Debt Instrument [Line Items]	'	'	'
Total debt outstanding	251,500	251,500	252,000
Less current portion	'	-22,100	'
Senior Notes Due 2018	'	'	'
Debt Instrument [Line Items]	'	'	'
Total debt outstanding	425,000	0	'
WML Term Debt due 2018 [Member]	'	'	'
Debt Instrument [Line Items]	'	'	'
Total debt outstanding	81,000	85,500	103,500
Capital Lease Obligations [Member]	'	'	'
Debt Instrument [Line Items]	'	'	'
Total debt outstanding	21,465	10,153	13,926
Other [Member]	'	'	'
Debt Instrument [Line Items]	'	'	'
Total debt outstanding	1,093	1,209	1,654
Debt Discount [Member]	'	'	'
Debt Instrument [Line Items]	'	'	'
Total debt outstanding	$20,173	($8,525)	($10,091)

LINES_OF_CREDIT_AND_LONGTERM_D3

LINES OF CREDIT AND LONG-TERM DEBT - Aggregate Contractual Debt Maturities of All Long-Term Debt and Lines of Credit (Detail) (USD $)	Mar. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified
Debt Instrument [Line Items]	'	'	'
2014	$19,569	$23,949	'
2015	24,710	22,662	'
2016	24,055	21,943	'
2017	24,664	22,492	'
2018	684,556	257,316	'
Thereafter	2,504	0	'
Total	780,058	348,362	'
Less: debt discount	-20,173	-8,525	'
Total debt outstanding	800,231	339,837	360,989
Term Debt [Member]	'	'	'
Debt Instrument [Line Items]	'	'	'
2014	'	18,000	'
2015	'	20,000	'
2016	'	20,000	'
2017	'	22,000	'
2018	'	5,500	'
Thereafter	'	0	'
Total debt outstanding	$81,000	$85,500	$103,500

LINES_OF_CREDIT_AND_LONGTERM_D4

LINES OF CREDIT AND LONG-TERM DEBT - Additional Information (Detail) (USD $)

12 Months Ended

12 Months Ended

12 Months Ended

12 Months Ended

0 Months Ended

3 Months Ended

12 Months Ended

12 Months Ended

12 Months Ended

0 Months Ended

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2011

Mar. 31, 2014

Mar. 31, 2014

Dec. 31, 2013

Dec. 31, 2013

Dec. 24, 2013

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2011

Dec. 31, 2013

Dec. 31, 2012

Mar. 31, 2014

Jun. 29, 2012

Feb. 04, 2011

Mar. 31, 2014

Feb. 07, 2014

Mar. 31, 2014

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2011

Mar. 31, 2014

Feb. 04, 2011

Dec. 31, 2011

Jan. 31, 2012

Mar. 31, 2014

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2013

Jan. 10, 2014

Feb. 07, 2014

Kemmerer Mine

Revolving Credit Facility [Member]

Letter of Credit [Member]

Letter of Credit [Member]

Westmoreland Mining, LLC [Member]

Westmoreland Mining, LLC [Member]

Westmoreland Mining, LLC [Member]

Westmoreland Mining, LLC [Member]

Corporate [Member]

10.75% Senior Notes [Member]

10.75% Senior Notes [Member]

10.75% Senior Notes [Member]

10.75% Senior Notes [Member]

10.75% Senior Notes [Member]

Add On Senior Secure Notes Due 2018 [Member]

Senior Notes Due 2018

Senior Notes Due 2018

Capital Lease Obligations [Member]

Capital Lease Obligations [Member]

Term Debt [Member]

Term Debt [Member]

Senior Notes Issued February 4, 2011 [Member]

Senior Notes Issued January 31, 2012 [Member]

Senior Notes Issued January 31, 2012 [Member]

Senior Notes Due 2018

Base Rate [Member]

Base Rate [Member]

London Interbank Offered Rate (LIBOR) [Member]

London Interbank Offered Rate (LIBOR) [Member]

Subsequent Event

Subsequent Event

Revolving Credit Facility [Member]

Two Thousand One Revolving Credit Agreement [Member]

Line of Credit [Member]

Westmoreland Mining, LLC [Member]

Westmoreland Mining, LLC [Member]

10.75% Senior Notes [Member]

10.75% Senior Notes [Member]

10.75% Senior Notes [Member]

Revolving Credit Facility [Member]

Westmoreland Mining, LLC [Member]

Revolving Credit Facility [Member]

Westmoreland Mining, LLC [Member]

Letter of Credit [Member]

Senior Notes Due 2018

Two Thousand One Revolving Credit Agreement [Member]

Two Thousand One Revolving Credit Agreement [Member]

Two Thousand One Revolving Credit Agreement [Member]

Revolving credit agreements:

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Term of revolving line of credit (in years)

'

'

'

'

'

'5 years

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Line of credit facility maximum borrowing capacity

'

'

'

'

'

$20,000,000

$2,000,000

$30,000,000

$25,000,000

$25,000,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

$10,000,000

'

Line and letter of credit facility, Available balance

'

'

'

'

'

'

20,000,000

'

'

'

'

23,100,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Spread on basis, percentage

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

0.50%

0.50%

2.25%

3.00%

'

'

Effective interest rate at period end, percentage

8.02%

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

3.75%

'

3.53%

'

'

Commitment fee, percentage

'

'

'

'

'

0.75%

'

'

'

'

0.50%

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Letters of credit outstanding amount

'

'

'

'

'

'

'

'

'

1,900,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

10.75% Senior Notes:

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Stated interest rate

'

'

'

'

'

'

'

'

'

3.75%

'

'

'

'

'

10.75%

10.75%

10.75%

10.75%

10.75%

10.75%

'

'

'

8.02%

10.75%

'

'

10.75%

'

'

'

'

'

10.75%

Secured senior note

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

425,000,000

425,000,000

'

'

'

'

'

150,000,000

'

125,000,000

425,000,000

'

'

'

'

'

425,000,000

Discount rate used for issuance of notes (in percentage)

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

5.00%

'

4.50%

'

'

'

'

'

'

'

Extinguishment of debt, amount

'

'

'

'

'

'

'

'

'

'

'

'

'

500,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Loss on extinguishment of debt

64,000

1,986,000

17,030,000

'

'

'

'

'

'

'

'

'

-7,900,000

100,000

'

'

'

'

'

'

'

'

'

-9,100,000

'

'

'

'

'

'

'

'

'

'

'

Percentage of principal amount of notes purchased through excess cash flow

'

'

'

'

'

'

'

'

'

'

'

'

'

100.00%

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Debt issuance costs capitalized

'

'

4,900,000

'

'

700,000

'

'

'

200,000

'

'

'

'

'

'

'

'

'

'

7,600,000

'

'

'

'

'

200,000

'

'

'

'

'

'

'

'

Repayments of debt

'

'

'

'

'

'

'

'

'

'

'

'

'

500,000

23,000,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Capital leases outstanding, Weighted average interest rate (in percentage)

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

6.40%

7.57%

'

'

'

'

'

'

'

'

'

'

'

'

Repayments of Long-term Capital Lease Obligations

2,700,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Principal Amount of Capital Lease Obligation Extinguished

2,500,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Debt Indenture Provisions Excess Cash Flow

'

'

'

'

'

'

'

'

'

'

'

'

'

29,500,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Current installments of long-term debt

44,343,000

23,791,000

'

48,586,000

'

'

'

'

'

'

'

'

'

22,100,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Debt Instrument, Unamortized Premium

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

29,200,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Debt Instrument, Redemption Price, Percentage

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

101.00%

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Proceeds from Issuance of Debt

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

454,200,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Issue price (as a percent of face value)

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

106.88%

'

'

'

'

'

'

'

'

'

'

'

'

'

'

106.88%

Cash transaction costs

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

26,000,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

26,000,000

Capital Lease Obligations

'

'

'

'

12,900,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Cash bonding obligation

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

$58,000,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

$58,000,000

POSTRETIREMENT_MEDICAL_BENEFIT2

POSTRETIREMENT MEDICAL BENEFITS - Postretirement Medicial Benefit Obligations Balance Sheet Disclosures (Details) (USD $)	3 Months Ended		12 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2014	Mar. 31, 2013	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Change in benefit obligation:	'	'	'	'	'
Net benefit obligation at beginning of year	'	$176,500	$176,500	'	'
Net benefit obligation at end of year	'	'	158,700	'	'
Change in plan assets:	'	'	'	'	'
Employer contributions	'	'	2,400	'	'
Amounts recognized in the balance sheet consist of:	'	'	'	'	'
Noncurrent liabilities	-23,524	'	-24,176	-54,250	'
Postretirement Medical Benefits [Member]	'	'	'	'	'
Change in benefit obligation:	'	'	'	'	'
Net benefit obligation at beginning of year	284,329	333,842	333,842	258,641	'
Liability acquired	'	'	0	49,241	'
Service cost	822	1,109	4,436	3,555	493
Interest cost	3,203	3,035	12,139	12,363	10,510
Plan participant contributions	'	'	132	129	'
Actuarial (gain) loss	'	'	-53,230	22,342	'
Gross benefits paid	'	'	-14,220	-13,544	'
Federal subsidy on benefits paid	'	'	1,230	1,115	'
Net benefit obligation at end of year	'	'	284,329	333,842	258,641
Change in plan assets:	'	'	'	'	'
Employer contributions	'	'	14,088	13,415	'
Plan participant contributions	'	'	132	129	'
Gross benefits paid	'	'	-14,220	-13,544	'
Fair value of plan assets at end of year	'	'	0	0	'
Unfunded status at end of year	'	'	-284,329	-333,842	'
Amounts recognized in the balance sheet consist of:	'	'	'	'	'
Current liabilities	'	'	-13,955	-14,068	'
Noncurrent liabilities	'	'	-270,374	-319,775	'
Accumulated other comprehensive loss (gain)	'	'	20,292	77,528	'
Net amount recognized at end of year	'	'	-264,037	-256,315	'
Amounts recognized in accumulated other comprehensive loss consist of:	'	'	'	'	'
Net actuarial loss (gain)	'	'	26,012	83,884	'
Accumulated other comprehensive loss (gain)	'	'	$20,292	$77,528	'

POSTRETIREMENT_MEDICAL_BENEFIT3

POSTRETIREMENT MEDICAL BENEFITS - Postretirement Medical Benefit Obligations Income Statement Disclosures (Details) (Postretirement Medical Benefits [Member], USD $)	3 Months Ended		12 Months Ended
	Mar. 31, 2014	Mar. 31, 2013	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Amounts that will be amortized from accumulated other comprehensive loss into net periodic pension cost:	'	'	'	'	'
Actuarial loss	'	'	$700,000	'	'
Prior service credit	'	'	600,000	'	'
Components of net periodic benefit cost:	'	'	'	'	'
Service cost	822,000	1,109,000	4,436,000	3,555,000	493,000
Interest cost	3,203,000	3,035,000	12,139,000	12,363,000	10,510,000
Amortization of:	'	'	'	'	'
Transition obligation	'	'	0	93,000	93,000
Prior service cost (credit)	'	'	-636,000	-636,000	-636,000
Actuarial loss	'	'	4,641,000	3,116,000	255,000
Defined Benefit Plan Amortization Of Deferred Items	5,000	1,001,000	'	'	'
Total net periodic benefit cost	4,030,000	5,145,000	20,580,000	18,491,000	10,715,000
Net periodic postretirement medical benefit costs relating to current and former mining operations:	'	'	'	'	'
Total net periodic benefit cost	4,030,000	5,145,000	20,580,000	18,491,000	10,715,000
Former Mining Operations [Member]	'	'	'	'	'
Amortization of:	'	'	'	'	'
Total net periodic benefit cost	2,403,000	3,119,000	12,475,000	11,314,000	9,259,000
Net periodic postretirement medical benefit costs relating to current and former mining operations:	'	'	'	'	'
Total net periodic benefit cost	2,403,000	3,119,000	12,475,000	11,314,000	9,259,000
Current Operations [Member]	'	'	'	'	'
Amortization of:	'	'	'	'	'
Total net periodic benefit cost	1,627,000	2,026,000	8,105,000	7,177,000	1,456,000
Net periodic postretirement medical benefit costs relating to current and former mining operations:	'	'	'	'	'
Total net periodic benefit cost	$1,627,000	$2,026,000	$8,105,000	$7,177,000	$1,456,000

POSTRETIREMENT_MEDICAL_BENEFIT4

POSTRETIREMENT MEDICAL BENEFITS Assumptions Used (Details) (Postretirement Medical Benefits [Member], USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Weighted-average discount rates used in calculations:	'	'	'
Rate used to determine net periodic benefit cost for the year shown	'	4.10%	5.15%
Assumed health care trend rates:	'	'	'
Health care cost trend rate assumed for next year	6.75%	7.00%	'
Rate to which the cost trend is assumed to decline (ultimate trend rate)	5.00%	5.00%	'
Year that the trend rate reaches the ultimate trend rate	'2021	'2021	'
Effect of a 1% change in the health care cost trend rate:	'	'	'
Effect of 1% increase on service and interest cost components	$3,148	'	'
Effect of 1% decrease on service and interest cost components	-2,442	'	'
Effect of 1% increase on postretirement medical benefit obligation	35,464	'	'
Effect of 1% decrease on postretirement medical benefit obligation	($30,096)	'	'
Minimum [Member]	'	'	'
Weighted-average discount rates used in calculations:	'	'	'
Rate used to determine benefit obligations as of the end of the year shown	4.50%	3.60%	'
Rate used to determine net periodic benefit cost for the year shown	3.60%	'	'
Maximum [Member]	'	'	'
Weighted-average discount rates used in calculations:	'	'	'
Rate used to determine benefit obligations as of the end of the year shown	5.05%	4.15%	'
Rate used to determine net periodic benefit cost for the year shown	4.15%	'	'

POSTRETIREMENT_MEDICAL_BENEFIT5

POSTRETIREMENT MEDICAL BENEFITS Expected Future Cash Flows (Details) (Postretirement Medical Benefits [Member], USD $)	Dec. 31, 2013
In Thousands, unless otherwise specified
Postretirement Medical Benefits [Member]	'
Expected future payments, postretirement medical benefits:	'
2014 - Postretirement Medical Benefits	$13,955
2015 - Postretirement Medical Benefits	14,522
2016 - Postretirement Medical Benefits	14,975
2017 - Postretirement Medical Benefits	15,408
2018 - Postretirement Medical Benefits	16,191
Years 2019 - 2023 - Postretirement Medical Benefits	85,342
Expected future receipts, Medicare D Subsidy:	'
2013 - Medicare D Subsidy	-1,249
2014 - Medicare D Subsidy	-1,293
2015 - Medicare D Subsidy	-1,336
2016 - Medicare D Subsidy	-1,386
2017 - Medicare D Subsidy	-1,432
Years 2018 - 2022 - Medicare D Subsidy	-7,807
Expected future payments, net	'
2013 - Net Postretirement Medical Benefits	12,706
2014 - Net Postretirement Medical Benefits	13,229
2015 - Net Postretirement Medical Benefits	13,639
2016 - Net Postretirement Medical Benefits	14,022
2017 - Net Postretirement Medical Benefits	14,759
Years 2018 - 2022 - Net Postretirement Medical Benefits	$77,535

POSTRETIREMENT_MEDICAL_BENEFIT6

POSTRETIREMENT MEDICAL BENEFITS Pneumoconiosis (Black Lung) Benefit Obligation (Details) (USD $)	Dec. 31, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified
Pneumoconiosis Benefit Obligation [Abstract]	'	'
Net benefit obligation at end of year	$158,700	$176,500
Pneumoconiosis (Black Lung) Benefits [Member]	'	'
Pneumoconiosis Benefit Obligation [Abstract]	'	'
Net benefit obligation at end of year	14,143	16,200
Plan assets at fair value, primarily government-backed securities	5,468	7,844
Unfunded status at end of year	8,675	8,356
Rate used to determine benefit obligations as of the end of the year shown	4.00%	3.25%
Pneumoconiosis (Black Lung) Benefits [Member] | Fair Value [Member]	'	'
Pneumoconiosis Benefit Obligation [Abstract]	'	'
Trust assets	5,468	7,844
Pneumoconiosis (Black Lung) Benefits [Member] | Quoted prices in active markets for identical assets - Level 1 [Member]	'	'
Pneumoconiosis Benefit Obligation [Abstract]	'	'
Trust assets	3	27
Pneumoconiosis (Black Lung) Benefits [Member] | Significant other observable inputs - Level 2 [Member]	'	'
Pneumoconiosis Benefit Obligation [Abstract]	'	'
Trust assets	5,465	7,817
Pneumoconiosis (Black Lung) Benefits [Member] | US Treasury Securities [Member] | Fair Value [Member]	'	'
Pneumoconiosis Benefit Obligation [Abstract]	'	'
Trust assets	5,280	7,548
Pneumoconiosis (Black Lung) Benefits [Member] | US Treasury Securities [Member] | Quoted prices in active markets for identical assets - Level 1 [Member]	'	'
Pneumoconiosis Benefit Obligation [Abstract]	'	'
Trust assets	0	0
Pneumoconiosis (Black Lung) Benefits [Member] | US Treasury Securities [Member] | Significant other observable inputs - Level 2 [Member]	'	'
Pneumoconiosis Benefit Obligation [Abstract]	'	'
Trust assets	5,280	7,548
Pneumoconiosis (Black Lung) Benefits [Member] | Collateralized Mortgage Backed Securities [Member] | Fair Value [Member]	'	'
Pneumoconiosis Benefit Obligation [Abstract]	'	'
Trust assets	185	269
Pneumoconiosis (Black Lung) Benefits [Member] | Collateralized Mortgage Backed Securities [Member] | Quoted prices in active markets for identical assets - Level 1 [Member]	'	'
Pneumoconiosis Benefit Obligation [Abstract]	'	'
Trust assets	0	0
Pneumoconiosis (Black Lung) Benefits [Member] | Collateralized Mortgage Backed Securities [Member] | Significant other observable inputs - Level 2 [Member]	'	'
Pneumoconiosis Benefit Obligation [Abstract]	'	'
Trust assets	185	269
Pneumoconiosis (Black Lung) Benefits [Member] | Cash and cash equivalents | Fair Value [Member]	'	'
Pneumoconiosis Benefit Obligation [Abstract]	'	'
Trust assets	3	27
Pneumoconiosis (Black Lung) Benefits [Member] | Cash and cash equivalents | Quoted prices in active markets for identical assets - Level 1 [Member]	'	'
Pneumoconiosis Benefit Obligation [Abstract]	'	'
Trust assets	3	27
Pneumoconiosis (Black Lung) Benefits [Member] | Cash and cash equivalents | Significant other observable inputs - Level 2 [Member]	'	'
Pneumoconiosis Benefit Obligation [Abstract]	'	'
Trust assets	0	0
Terminated Employees [Member] | Pneumoconiosis (Black Lung) Benefits [Member]	'	'
Pneumoconiosis Benefit Obligation [Abstract]	'	'
Net benefit obligation at end of year	876	1,139
Existing Claimants [Member] | Pneumoconiosis (Black Lung) Benefits [Member]	'	'
Pneumoconiosis Benefit Obligation [Abstract]	'	'
Net benefit obligation at end of year	$13,267	$15,061

POSTRETIREMENT_MEDICAL_BENEFIT7

POSTRETIREMENT MEDICAL BENEFITS - Additional Information (Detail) (USD $)	12 Months Ended			12 Months Ended		12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Mar. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
				Postretirement Medical Benefits [Member]	Postretirement Medical Benefits [Member]	Combined Benefit Fund [Member]	Combined Benefit Fund [Member]	Combined Benefit Fund [Member]
Defined Benefit Plan Disclosure [Line Items]	'	'	'	'	'	'	'	'
Prior service costs	'	'	'	($5,720,000)	($6,356,000)	'	'	'
Defined Benefit Plan, Benefit Obligation, Period Increase (Decrease)	'	'	'	49,500,000	'	'	'	'
Defined Benefit Plan Transition Obligation Amortization Period	'20 years	'	'	'	'	'	'	'
Multiemployer Plan, Period Contributions	'	'	'	'	'	2,200,000	2,300,000	2,600,000
Workers' Compensation Disclosure [Abstract]	'	'	'	'	'	'	'	'
Workers' compensation, beginning of year (including current portion)	9,530,000	11,626,000	'	'	'	'	'	'
Accretion	166,000	204,000	'	'	'	'	'	'
Claims paid	-581,000	-475,000	'	'	'	'	'	'
Actuarial changes	-1,654,000	-1,825,000	'	'	'	'	'	'
Workers' compensation, end of year	7,461,000	9,530,000	'	'	'	'	'	'
Less current portion	-717,000	-820,000	-712,000	'	'	'	'	'
Workers' compensation, less current portion	$6,744,000	$8,710,000	$6,680,000	'	'	'	'	'
Workers' compensation discount, percent	3.00%	2.00%	'	'	'	'	'	'

PENSION_AND_OTHER_SAVING_PLAN_

PENSION AND OTHER SAVING PLAN - Balance Sheet Disclosures (Details) (USD $)

12 Months Ended

3 Months Ended

12 Months Ended

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2011

Dec. 31, 2010

Mar. 31, 2014

Mar. 31, 2013

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2011

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2011

Pension Benefits [Member]

Pension Benefits [Member]

Pension Benefits [Member]

Pension [Member]

Pension [Member]

Pension [Member]

SERP [Member]

SERP [Member]

SERP [Member]

Change in benefit obligation:

'

'

'

'

'

'

'

'

'

'

'

'

'

Net benefit obligation at beginning of year

$176,500,000

'

'

'

'

'

'

$172,289,000

$100,582,000

'

$4,241,000

$4,511,000

'

Liability acquired

'

'

'

'

'

'

'

0

57,307,000

'

0

0

'

Service cost

'

'

'

'

500,000

534,000

'

2,346,000

2,139,000

784,000

0

0

0

Interest cost

'

'

'

'

1,747,000

1,625,000

'

6,209,000

6,330,000

4,568,000

152,000

172,000

215,000

Actuarial loss

'

'

'

'

'

'

'

-18,972,000

13,121,000

'

-359,000

-48,000

'

Gross benefits paid

'

'

'

'

'

'

'

-6,797,000

-7,190,000

'

-394,000

-394,000

'

Net benefit obligation at end of year

158,700,000

'

'

'

'

'

'

155,075,000

172,289,000

100,582,000

3,640,000

4,241,000

4,511,000

Change in plan assets:

'

'

'

'

'

'

'

'

'

'

'

'

'

Fair value of plan assets at beginning of year

'

'

'

'

'

'

'

121,887,000

75,710,000

'

0

0

'

Assets acquired

'

'

'

'

'

'

'

0

41,704,000

'

0

0

'

Actual return on plan assets

'

'

'

'

'

'

'

18,414,000

11,502,000

'

0

0

'

Employer contributions

2,400,000

'

'

'

600,000

'

'

645,000

161,000

'

394,000

394,000

'

Funded status at end of year

'

'

'

'

'

'

'

-20,926,000

-50,402,000

'

-3,640,000

-4,241,000

'

Fair value of plan assets at end of year

'

'

'

'

'

'

'

134,149,000

121,887,000

75,710,000

0

0

0

Amounts recognized in the accompanying balance sheet consist of:

'

'

'

'

'

'

'

'

'

'

'

'

'

Current liability

'

'

'

'

'

'

'

0

0

'

-390,000

-390,000

'

Noncurrent liability

'

'

'

'

'

'

'

-20,926,000

-50,401,000

'

-3,250,000

-3,850,000

'

Accumulated other comprehensive loss

32,547,000

122,246,000

95,624,000

32,049,000

'

'

'

11,045,000

43,037,000

'

1,209,000

1,679,000

'

Net amount recognized at end of year

'

'

'

'

'

'

'

-9,881,000

-7,364,000

'

-2,431,000

-2,561,000

'

Amounts recognized in accumulated other comprehensive loss consist of:

'

'

'

'

'

'

'

'

'

'

'

'

'

Net actuarial loss

'

'

'

'

'

'

'

11,045,000

43,037,000

'

1,209,000

1,679,000

'

Accumulated other comprehensive loss (gain)

'

'

'

'

'

'

'

11,045,000

43,037,000

'

1,209,000

1,679,000

'

Defined Benefit Plan, Benefit Obligation, Period Increase (Decrease)

'

'

'

'

'

'

$30,100,000

'

'

'

'

'

'

PENSION_AND_OTHER_SAVINGS_PLAN

PENSION AND OTHER SAVINGS PLANS - Income Statement Disclosures (Details) (USD $)	3 Months Ended		12 Months Ended
	Mar. 31, 2014	Mar. 31, 2013	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
	Pension Benefits [Member]	Pension Benefits [Member]	SERP [Member]	SERP [Member]	SERP [Member]	Pension [Member]	Pension [Member]	Pension [Member]
Defined Benefit Plan Disclosure [Line Items]	'	'	'	'	'	'	'	'
Actuarial loss	'	'	$100,000	'	'	$800,000	'	'
Components of net periodic benefit cost:	'	'	'	'	'	'	'	'
Service cost	500,000	534,000	0	0	0	2,346,000	2,139,000	784,000
Interest cost	1,747,000	1,625,000	152,000	172,000	215,000	6,209,000	6,330,000	4,568,000
Expected return on plan assets	-2,154,000	-2,060,000	0	0	0	-8,770,000	-8,241,000	-5,218,000
Defined Benefit Plan Amortization Of Deferred Items	359,000	741,000	'	'	'	'	'	'
Prior service cost (credit)	'	'	0	0	5,000	0	0	0
Actuarial loss	'	'	112,000	95,000	64,000	3,377,000	2,867,000	1,578,000
Total net periodic benefit cost	$452,000	$840,000	$264,000	$267,000	$284,000	$3,162,000	$3,095,000	$1,712,000

PENSION_AND_OTHER_SAVING_PLANS2

PENSION AND OTHER SAVING PLANS - Assumptions Used (Details)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Pension [Member]	'	'	'
Defined Benefit Plan Disclosure [Line Items]	'	'	'
Expected return on plan assets, percentage	7.40%	7.40%	7.40%
Pension [Member] | Minimum [Member]	'	'	'
Defined Benefit Plan Disclosure [Line Items]	'	'	'
Rate used to determine benefit obligations as of the end of the year shown	4.25%	3.35%	'
Rate used to determine net periodic benefit cost for the year shown	3.35%	4.05%	5.15%
Pension [Member] | Maximum [Member]	'	'	'
Defined Benefit Plan Disclosure [Line Items]	'	'	'
Rate used to determine benefit obligations as of the end of the year shown	4.65%	3.75%	'
Rate used to determine net periodic benefit cost for the year shown	3.75%	4.25%	5.40%
SERP [Member]	'	'	'
Defined Benefit Plan Disclosure [Line Items]	'	'	'
Rate used to determine benefit obligations as of the end of the year shown	4.65%	3.75%	'
Rate used to determine net periodic benefit cost for the year shown	3.75%	4.25%	5.40%

PENSION_AND_OTHER_SAVING_PLANS3

PENSION AND OTHER SAVING PLANS - Information on Plan Assets (Details) (Pension [Member], USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Defined Benefit Plan Disclosure [Line Items]	'	'
Unrealized (loss) gain	$18,414	$11,502
Fair Value [Member]	'	'
Defined Benefit Plan Disclosure [Line Items]	'	'
Plan assets, ending balance	134,149	121,887
Quoted prices in active markets for identical assets - Level 1 [Member]	'	'
Defined Benefit Plan Disclosure [Line Items]	'	'
Plan assets, ending balance	2,717	13,796
Significant other observable inputs - Level 2 [Member]	'	'
Defined Benefit Plan Disclosure [Line Items]	'	'
Plan assets, ending balance	131,182	107,477
Significant unobservable inputs, Level 3 [Member]	'	'
Defined Benefit Plan Disclosure [Line Items]	'	'
Plan assets, beginning balance	614	1,050
Unrealized (loss) gain	5	96
Settlements	-369	-532
Plan assets, ending balance	250	614
Large-cap pooled separate accounts [Member] | Fair Value [Member]	'	'
Defined Benefit Plan Disclosure [Line Items]	'	'
Plan assets, ending balance	48,983	50,589
Large-cap pooled separate accounts [Member] | Quoted prices in active markets for identical assets - Level 1 [Member]	'	'
Defined Benefit Plan Disclosure [Line Items]	'	'
Plan assets, ending balance	0	0
Large-cap pooled separate accounts [Member] | Significant other observable inputs - Level 2 [Member]	'	'
Defined Benefit Plan Disclosure [Line Items]	'	'
Plan assets, ending balance	48,983	50,589
Large-cap pooled separate accounts [Member] | Significant unobservable inputs, Level 3 [Member]	'	'
Defined Benefit Plan Disclosure [Line Items]	'	'
Plan assets, ending balance	0	0
International blend [Member] | Fair Value [Member]	'	'
Defined Benefit Plan Disclosure [Line Items]	'	'
Plan assets, ending balance	18,191	10,294
International blend [Member] | Quoted prices in active markets for identical assets - Level 1 [Member]	'	'
Defined Benefit Plan Disclosure [Line Items]	'	'
Plan assets, ending balance	0	0
International blend [Member] | Significant other observable inputs - Level 2 [Member]	'	'
Defined Benefit Plan Disclosure [Line Items]	'	'
Plan assets, ending balance	18,191	10,294
International blend [Member] | Significant unobservable inputs, Level 3 [Member]	'	'
Defined Benefit Plan Disclosure [Line Items]	'	'
Plan assets, ending balance	0	0
Fixed income domestic [Member] | Fair Value [Member]	'	'
Defined Benefit Plan Disclosure [Line Items]	'	'
Plan assets, ending balance	40,944	42,744
Fixed income domestic [Member] | Quoted prices in active markets for identical assets - Level 1 [Member]	'	'
Defined Benefit Plan Disclosure [Line Items]	'	'
Plan assets, ending balance	0	0
Fixed income domestic [Member] | Significant other observable inputs - Level 2 [Member]	'	'
Defined Benefit Plan Disclosure [Line Items]	'	'
Plan assets, ending balance	40,944	42,744
Fixed income domestic [Member] | Significant unobservable inputs, Level 3 [Member]	'	'
Defined Benefit Plan Disclosure [Line Items]	'	'
Plan assets, ending balance	0	0
Fixed income long term [Member] | Fair Value [Member]	'	'
Defined Benefit Plan Disclosure [Line Items]	'	'
Plan assets, ending balance	17,797	'
Fixed income long term [Member] | Quoted prices in active markets for identical assets - Level 1 [Member]	'	'
Defined Benefit Plan Disclosure [Line Items]	'	'
Plan assets, ending balance	0	'
Fixed income long term [Member] | Significant other observable inputs - Level 2 [Member]	'	'
Defined Benefit Plan Disclosure [Line Items]	'	'
Plan assets, ending balance	17,797	'
Fixed income long term [Member] | Significant unobservable inputs, Level 3 [Member]	'	'
Defined Benefit Plan Disclosure [Line Items]	'	'
Plan assets, ending balance	0	'
Stable value [Member] | Fair Value [Member]	'	'
Defined Benefit Plan Disclosure [Line Items]	'	'
Plan assets, ending balance	5,267	3,850
Stable value [Member] | Quoted prices in active markets for identical assets - Level 1 [Member]	'	'
Defined Benefit Plan Disclosure [Line Items]	'	'
Plan assets, ending balance	0	0
Stable value [Member] | Significant other observable inputs - Level 2 [Member]	'	'
Defined Benefit Plan Disclosure [Line Items]	'	'
Plan assets, ending balance	5,267	3,850
Stable value [Member] | Significant unobservable inputs, Level 3 [Member]	'	'
Defined Benefit Plan Disclosure [Line Items]	'	'
Plan assets, ending balance	0	0
Debt securities funds [Member]	'	'
Defined Benefit Plan Disclosure [Line Items]	'	'
Target asset allocation - minimum	40.00%	'
Target asset allocation - maximum	80.00%	'
Registered investment companies - growth fund [Member] | Fair Value [Member]	'	'
Defined Benefit Plan Disclosure [Line Items]	'	'
Plan assets, ending balance	0	10,295
Registered investment companies - growth fund [Member] | Quoted prices in active markets for identical assets - Level 1 [Member]	'	'
Defined Benefit Plan Disclosure [Line Items]	'	'
Plan assets, ending balance	0	10,295
Registered investment companies - growth fund [Member] | Significant other observable inputs - Level 2 [Member]	'	'
Defined Benefit Plan Disclosure [Line Items]	'	'
Plan assets, ending balance	0	0
Registered investment companies - growth fund [Member] | Significant unobservable inputs, Level 3 [Member]	'	'
Defined Benefit Plan Disclosure [Line Items]	'	'
Plan assets, ending balance	0	0
Limited partnerships and limited liability companies [Member] | Fair Value [Member]	'	'
Defined Benefit Plan Disclosure [Line Items]	'	'
Plan assets, ending balance	250	614
Limited partnerships and limited liability companies [Member] | Quoted prices in active markets for identical assets - Level 1 [Member]	'	'
Defined Benefit Plan Disclosure [Line Items]	'	'
Plan assets, ending balance	0	0
Limited partnerships and limited liability companies [Member] | Significant other observable inputs - Level 2 [Member]	'	'
Defined Benefit Plan Disclosure [Line Items]	'	'
Plan assets, ending balance	0	0
Limited partnerships and limited liability companies [Member] | Significant unobservable inputs, Level 3 [Member]	'	'
Defined Benefit Plan Disclosure [Line Items]	'	'
Plan assets, ending balance	250	614
Westmoreland Coal common stock [Member] | Fair Value [Member]	'	'
Defined Benefit Plan Disclosure [Line Items]	'	'
Plan assets, ending balance	2,255	3,500
Westmoreland Coal common stock [Member] | Quoted prices in active markets for identical assets - Level 1 [Member]	'	'
Defined Benefit Plan Disclosure [Line Items]	'	'
Plan assets, ending balance	2,255	3,500
Westmoreland Coal common stock [Member] | Significant other observable inputs - Level 2 [Member]	'	'
Defined Benefit Plan Disclosure [Line Items]	'	'
Plan assets, ending balance	0	0
Westmoreland Coal common stock [Member] | Significant unobservable inputs, Level 3 [Member]	'	'
Defined Benefit Plan Disclosure [Line Items]	'	'
Plan assets, ending balance	0	0
Cash and cash equivalents	'	'
Defined Benefit Plan Disclosure [Line Items]	'	'
Target asset allocation - minimum	0.00%	'
Target asset allocation - maximum	10.00%	'
Cash and cash equivalents | Fair Value [Member]	'	'
Defined Benefit Plan Disclosure [Line Items]	'	'
Plan assets, ending balance	462	1
Cash and cash equivalents | Quoted prices in active markets for identical assets - Level 1 [Member]	'	'
Defined Benefit Plan Disclosure [Line Items]	'	'
Plan assets, ending balance	462	1
Cash and cash equivalents | Significant other observable inputs - Level 2 [Member]	'	'
Defined Benefit Plan Disclosure [Line Items]	'	'
Plan assets, ending balance	0	0
Cash and cash equivalents | Significant unobservable inputs, Level 3 [Member]	'	'
Defined Benefit Plan Disclosure [Line Items]	'	'
Plan assets, ending balance	$0	$0
Equity funds [Member]	'	'
Defined Benefit Plan Disclosure [Line Items]	'	'
Target asset allocation - minimum	20.00%	'
Target asset allocation - maximum	60.00%	'
Other asset category [Member]	'	'
Defined Benefit Plan Disclosure [Line Items]	'	'
Target asset allocation - minimum	0.00%	'
Target asset allocation - maximum	10.00%	'

PENSION_AND_OTHER_SAVING_PLANS4

PENSION AND OTHER SAVING PLANS - Multiemployer Plans (Details) (USD $)

Jan. 31, 2012

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2011

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2011

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2011

Dec. 31, 2013

Dec. 31, 2013

In Millions, unless otherwise specified

WECO [Member]

WECO [Member]

WECO [Member]

WRI [Member]

WRI [Member]

WRI [Member]

WSC [Member]

WSC [Member]

WSC [Member]

Minimum [Member]

Maximum [Member]

WSC [Member]

WSC [Member]

Multiemployer Plans [Line Items]

'

'

'

'

'

'

'

'

'

'

'

'

Multiemployer Plans Funded Status Minimum Percentage

80.00%

'

'

'

'

'

'

'

'

'

'

'

Multiemployer Plan Minimum Contribution Per Hour Worked

'

5.75

'

'

5.7

'

'

'

'

'

2.95

3.2

Multiemployer Plan, Period Contributions

'

$3.40

$3.20

$3.20

$0.90

$0.50

$0.90

$0.10

$0.10

$0.10

'

'

PENSION_AND_OTHER_SAVINGS_PLAN1

PENSION AND OTHER SAVINGS PLANS - Additional Information (Details) (USD $)	12 Months Ended	3 Months Ended	12 Months Ended			12 Months Ended
	Dec. 31, 2013	Mar. 31, 2014	Dec. 31, 2013	Jun. 28, 2012	Jun. 28, 2012	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
		Pension Benefits [Member]	Pension Benefits [Member]	Pre-amendment [Member]	Post-amendment [Member]	401-K [Member]	401-K [Member]	401-K [Member]
				Pension Benefits [Member]	Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]	'	'	'	'	'	'	'	'
Defined benefit plan, number of continuous years of employment	'5 years	'	'	'	'	'	'	'
Term For Loan Covenant Criteria	'	'	'8 months 15 days	'	'	'	'	'
Expected contributions	'	$3,700,000	$4,300,000	'	'	'	'	'
Debt covenants, minimum funding of pension plan (in percentage)	'	'	'	90.00%	80.00%	'	'	'
Cash contributions	1,200,000	'	600,000	'	'	'	'	'
Defined Contribution Plan, Cost Recognized	'	'	'	'	'	3,600,000	2,900,000	2,700,000
Employer contributions, common stock	2,400,000	600,000	'	'	'	'	'	'
2014 - Pension	'	'	7,324,000	'	'	'	'	'
2015 - Pension	'	'	7,772,000	'	'	'	'	'
2016 - Pension	'	'	8,238,000	'	'	'	'	'
2017 - Pension	'	'	9,066,000	'	'	'	'	'
2018 - Pension	'	'	9,321,000	'	'	'	'	'
Years 2019 - 2023 - Pension	'	'	$50,340,000	'	'	'	'	'

HERITAGE_HEALTH_BENEFIT_EXPENS2

HERITAGE HEALTH BENEFIT EXPENSES - Components of Costs of Benefits to Former Mining Operation Employees (Detail) (USD $)	3 Months Ended		12 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2014	Mar. 31, 2013	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Heritage Health Benefit Expenses [Abstract]	'	'	'	'	'
Health care benefits	$2,276	$3,176	$12,579	$11,367	$9,507
Combined benefit fund payments	512	576	2,240	2,258	2,617
Workers' compensation benefits	136	116	-1,212	-1,322	2,132
Black lung benefits	620	83	-189	1,085	4,319
Total	$3,544	$3,951	$13,418	$13,388	$18,575

ASSET_RETIREMENT_OBLIGATIONS_C2

ASSET RETIREMENT OBLIGATIONS, CONTRACTUAL THIRD-PARTY RECLAMATION RECEIVABLES, AND RECLAMATION DEPOSITS - Summary of Asset Retirement Obligations, Contractual Third-Party Reclamation Receivables, and Reclamation Deposits (Detail) (USD $)	Mar. 31, 2014	Dec. 31, 2013	Mar. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Asset Retirement Obligation [Line Items]	'	'	'	'	'
Asset Retirement Obligation	$281,263,000	$279,864,000	$263,489,000	$263,847,000	$247,478,000
Contractual Third- Party Reclamation Receivable	96,249,000	96,790,000	'	'	'
Reclamation deposits	75,315,000	74,921,000	'	72,718,000	'
Reclamation Obligations, Surety Bonds Outstanding	'	298,600,000	'	'	'
Rosebud Mine	'	'	'	'	'
Asset Retirement Obligation [Line Items]	'	'	'	'	'
Asset Retirement Obligation	127,989,000	126,965,000	'	'	'
Contractual Third- Party Reclamation Receivable	21,656,000	21,186,000	'	'	'
Reclamation deposits	75,315,000	74,921,000	'	'	'
Jewett Mine	'	'	'	'	'
Asset Retirement Obligation [Line Items]	'	'	'	'	'
Asset Retirement Obligation	74,247,000	75,267,000	'	'	'
Contractual Third- Party Reclamation Receivable	74,247,000	75,267,000	'	'	'
Reclamation deposits	0	0	'	'	'
Absaloka Mine	'	'	'	'	'
Asset Retirement Obligation [Line Items]	'	'	'	'	'
Asset Retirement Obligation	37,286,000	36,401,000	'	'	'
Contractual Third- Party Reclamation Receivable	346,000	337,000	'	'	'
Reclamation deposits	0	0	'	'	'
Beulah Mine	'	'	'	'	'
Asset Retirement Obligation [Line Items]	'	'	'	'	'
Asset Retirement Obligation	17,764,000	17,785,000	'	'	'
Contractual Third- Party Reclamation Receivable	0	0	'	'	'
Reclamation deposits	0	0	'	'	'
Kemmerer Mine	'	'	'	'	'
Asset Retirement Obligation [Line Items]	'	'	'	'	'
Asset Retirement Obligation	17,569,000	17,174,000	'	'	'
Contractual Third- Party Reclamation Receivable	0	0	'	'	'
Reclamation deposits	0	0	'	'	'
Savage	'	'	'	'	'
Asset Retirement Obligation [Line Items]	'	'	'	'	'
Asset Retirement Obligation	5,499,000	5,380,000	'	'	'
Contractual Third- Party Reclamation Receivable	0	0	'	'	'
Reclamation deposits	0	0	'	'	'
ROVA	'	'	'	'	'
Asset Retirement Obligation [Line Items]	'	'	'	'	'
Asset Retirement Obligation	909,000	892,000	'	'	'
Contractual Third- Party Reclamation Receivable	0	0	'	'	'
Reclamation deposits	$0	$0	'	'	'

ASSET_RETIREMENT_OBLIGATIONS_C3

ASSET RETIREMENT OBLIGATIONS, CONTRACTUAL THIRD-PARTY RECLAMATION RECEIVABLES, AND RECLAMATION DEPOSITS - Changes in Company's Asset Retirement Obligations (Detail) (USD $)	3 Months Ended		12 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2014	Mar. 31, 2013	Dec. 31, 2013	Dec. 31, 2012
Asset Retirement Obligation Disclosure [Abstract]	'	'	'	'
Asset retirement obligations, beginning of period	$279,864	$263,847	$263,847	$247,478
Accretion	5,836	5,481	21,905	21,909
Liabilities settled	-4,437	-5,839	-21,630	-17,342
Changes due to amount and timing of reclamation	'	'	15,742	-7,575
ARO acquired	'	'	0	19,377
Asset retirement obligations, end of period	281,263	263,489	279,864	263,847
Less current portion	-22,227	-23,154	-23,353	-22,238
Asset retirement obligations, less current portion	$259,036	$240,335	$256,511	$241,609

ASSET_RETIREMENT_OBLIGATIONS_C4

ASSET RETIREMENT OBLIGATIONS, CONTRACTUAL THIRD-PARTY RECLAMATION RECEIVABLES, AND RECLAMATION DEPOSITS - Carrying Value and Estimated Fair Value of Reclamation Deposits (Detail) (USD $)	3 Months Ended
	Dec. 31, 2011	Mar. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Asset Retirement Obligation [Line Items]	'	'	'	'
Reclamation deposits	'	$75,315,000	$74,921,000	$72,718,000
Gain on available-for-sale securities held as reclamation deposits	100,000	'	'	'
Carrying Value [Member]	'	'	'	'
Asset Retirement Obligation [Line Items]	'	'	'	'
Reclamation deposits	'	75,315,000	74,921,000	'
Carrying Value [Member] | Cash and cash equivalents	'	'	'	'
Asset Retirement Obligation [Line Items]	'	'	'	'
Reclamation deposits	'	'	63,525,000	'
Carrying Value [Member] | Held-to-maturity securities	'	'	'	'
Asset Retirement Obligation [Line Items]	'	'	'	'
Reclamation deposits	'	'	11,396,000	'
Fair Value [Member]	'	'	'	'
Asset Retirement Obligation [Line Items]	'	'	'	'
Reclamation deposits	'	76,028,000	75,611,000	'
Fair Value [Member] | Cash and cash equivalents	'	'	'	'
Asset Retirement Obligation [Line Items]	'	'	'	'
Reclamation deposits	'	'	63,525,000	'
Fair Value [Member] | Held-to-maturity securities	'	'	'	'
Asset Retirement Obligation [Line Items]	'	'	'	'
Reclamation deposits	'	'	$12,086,000	'

ASSET_RETIREMENT_OBLIGATIONS_C5

ASSET RETIREMENT OBLIGATIONS, CONTRACTUAL THIRD-PARTY RECLAMATION RECEIVABLES, AND RECLAMATION DEPOSITS - Amortized Cost, Gross Unrealized Holding Gains and Losses and Fair Value of Held-to-Maturity Securities (Detail) (Reclamation Deposits [Member], USD $)	Mar. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified
Reclamation Deposits [Member]	'	'	'
Schedule of Held-to-maturity Securities [Line Items]	'	'	'
Amortized cost	$25,688	$11,396	$19,832
Gross unrealized holding gains	826	764	1,190
Gross unrealized holding losses	-113	-74	-9
Fair value	$26,401	$12,086	$21,013

ASSET_RETIREMENT_OBLIGATIONS_C6

ASSET RETIREMENT OBLIGATIONS, CONTRACTUAL THIRD-PARTY RECLAMATION RECEIVABLES, AND RECLAMATION DEPOSITS - Maturities of Held-to-Maturity Securities (Detail) (Reclamation Deposits [Member], USD $)	Mar. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified
Reclamation Deposits [Member]	'	'	'
Schedule of Held-to-maturity Securities [Line Items]	'	'	'
Within one year, Amortized cost	$479	$17	'
Due in five years or less, Amortized cost	17,562	6,645	'
Due after five years to ten years, Amortized cost	4,869	3,002	'
Due in more than ten years, Amortized cost	2,778	1,732	'
Maturities of held-to-maturity securities, Amortized cost	25,688	11,396	'
Within one year, Fair Value	468	17	'
Due in five years or less, Fair Value	17,880	6,976	'
Due after five years to ten years, Fair Value	5,023	3,123	'
Due in more than ten years, Fair Value	3,030	1,970	'
Fair value	$26,401	$12,086	$21,013

ASSET_RETIREMENT_OBLIGATIONS_C7

ASSET RETIREMENT OBLIGATIONS, CONTRACTUAL THIRD-PARTY RECLAMATION RECEIVABLES, AND RECLAMATION DEPOSITS - Cost Basis, Gross Unrealized Holding Gains and Fair Value of Available-for-Sale Securities (Detail) (USD $)	Mar. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified
Schedule of Available-for-sale Securities [Line Items]	'	'	'
Reclamation deposits	$75,315	$74,921	$72,718
Reclamation Deposits [Member]	'	'	'
Schedule of Available-for-sale Securities [Line Items]	'	'	'
Cost basis	'	0	1,000
Gross unrealized holding gains	'	0	39
Fair value	'	'	$1,039

ASSET_RETIREMENT_OBLIGATIONS_C8

ASSET RETIREMENT OBLIGATIONS, CONTRACTUAL THIRD-PARTY RECLAMATION RECEIVABLES, AND RECLAMATION DEPOSITS - Summary of Assets Retirement Obligations, Contractual Third-Party Reclamation Receivables, and Reclamation Deposits (Detail) (USD $)	3 Months Ended
	Dec. 31, 2011	Mar. 31, 2014	Dec. 31, 2013	Mar. 31, 2013	Dec. 31, 2012
Asset Retirement Obligation [Line Items]	'	'	'	'	'
Asset Retirement Obligation	$247,478,000	$281,263,000	$279,864,000	$263,489,000	$263,847,000
Contractual Third- Party Reclamation Receivable	'	96,249,000	96,790,000	'	'
Reclamation deposits	'	75,315,000	74,921,000	'	72,718,000
Gain on available-for-sale securities held as reclamation deposits	100,000	'	'	'	'
Rosebud Mine	'	'	'	'	'
Asset Retirement Obligation [Line Items]	'	'	'	'	'
Asset Retirement Obligation	'	127,989,000	126,965,000	'	'
Contractual Third- Party Reclamation Receivable	'	21,656,000	21,186,000	'	'
Reclamation deposits	'	75,315,000	74,921,000	'	'
Jewett Mine	'	'	'	'	'
Asset Retirement Obligation [Line Items]	'	'	'	'	'
Asset Retirement Obligation	'	74,247,000	75,267,000	'	'
Contractual Third- Party Reclamation Receivable	'	74,247,000	75,267,000	'	'
Reclamation deposits	'	0	0	'	'
Absaloka Mine	'	'	'	'	'
Asset Retirement Obligation [Line Items]	'	'	'	'	'
Asset Retirement Obligation	'	37,286,000	36,401,000	'	'
Contractual Third- Party Reclamation Receivable	'	346,000	337,000	'	'
Reclamation deposits	'	0	0	'	'
Beulah Mine	'	'	'	'	'
Asset Retirement Obligation [Line Items]	'	'	'	'	'
Asset Retirement Obligation	'	17,764,000	17,785,000	'	'
Contractual Third- Party Reclamation Receivable	'	0	0	'	'
Reclamation deposits	'	0	0	'	'
Kemmerer Mine	'	'	'	'	'
Asset Retirement Obligation [Line Items]	'	'	'	'	'
Asset Retirement Obligation	'	17,569,000	17,174,000	'	'
Contractual Third- Party Reclamation Receivable	'	0	0	'	'
Reclamation deposits	'	0	0	'	'
Savage	'	'	'	'	'
Asset Retirement Obligation [Line Items]	'	'	'	'	'
Asset Retirement Obligation	'	5,499,000	5,380,000	'	'
Contractual Third- Party Reclamation Receivable	'	0	0	'	'
Reclamation deposits	'	0	0	'	'
ROVA	'	'	'	'	'
Asset Retirement Obligation [Line Items]	'	'	'	'	'
Asset Retirement Obligation	'	909,000	892,000	'	'
Contractual Third- Party Reclamation Receivable	'	0	0	'	'
Reclamation deposits	'	$0	$0	'	'

DERIVATIVE_INSTRUMENTS_Income_

DERIVATIVE INSTRUMENTS - Income Expense (Details) (Not designated as hedging instrument, Convertible debt - conversion feature, Other Income, USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Not designated as hedging instrument | Convertible debt - conversion feature | Other Income	'	'	'
Derivative [Line Items]	'	'	'
Income (expense) recognized in earnings on derivatives	$0	$0	$3,079

ASSET_RETIREMENT_OBLIGATIONS_C9

ASSET RETIREMENT OBLIGATIONS, CONTRACTUAL THIRD-PARTY RECLAMATION RECEIVABLES, AND RECLAMATION DEPOSITS - Carrying Value, Estimated Fair Value of Reclamation Deposits (Detail) (USD $)	Mar. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified
Asset Retirement Obligation [Line Items]	'	'	'
Reclamation deposits	$75,315	$74,921	$72,718
Carrying Value	'	'	'
Asset Retirement Obligation [Line Items]	'	'	'
Reclamation deposits	75,315	74,921	'
Carrying Value | Cash and cash equivalents	'	'	'
Asset Retirement Obligation [Line Items]	'	'	'
Reclamation deposits	'	63,525	'
Carrying Value | Cash and cash equivalents | Level 1	'	'	'
Asset Retirement Obligation [Line Items]	'	'	'
Reclamation deposits	49,627	'	'
Carrying Value | Held-to-maturity securities	'	'	'
Asset Retirement Obligation [Line Items]	'	'	'
Reclamation deposits	'	11,396	'
Carrying Value | Held-to-maturity securities | Level 2	'	'	'
Asset Retirement Obligation [Line Items]	'	'	'
Reclamation deposits	25,688	'	'
Fair Value	'	'	'
Asset Retirement Obligation [Line Items]	'	'	'
Reclamation deposits	76,028	75,611	'
Fair Value | Cash and cash equivalents	'	'	'
Asset Retirement Obligation [Line Items]	'	'	'
Reclamation deposits	'	63,525	'
Fair Value | Cash and cash equivalents | Level 1	'	'	'
Asset Retirement Obligation [Line Items]	'	'	'
Reclamation deposits	49,627	'	'
Fair Value | Held-to-maturity securities	'	'	'
Asset Retirement Obligation [Line Items]	'	'	'
Reclamation deposits	'	12,086	'
Fair Value | Held-to-maturity securities | Level 2	'	'	'
Asset Retirement Obligation [Line Items]	'	'	'
Reclamation deposits	$26,401	'	'

DERIVATIVE_INSTRUMENTS_Details

DERIVATIVE INSTRUMENTS (Details) (Not Designated as Hedging Instrument [Member], Foreign Exchange Forward [Member], USD $)	3 Months Ended
	Mar. 31, 2014
Derivative [Line Items]	'
Derivative, Number of Instruments Held	2
Derivative, Notional Amount	$348,300,000
Foreign Currency Gain (Loss) [Member]	'
Derivative [Line Items]	'
Income (expense) recognized in earnings on derivatives	-6,790,000
Other Current Assets [Member]	'
Derivative [Line Items]	'
Derivative Asset	246,000
Other Current Liabilities [Member]	'
Derivative [Line Items]	'
Derivative Liability	($7,036,000)

FAIR_VALUE_MEASUREMENTS_Estima

FAIR VALUE MEASUREMENTS - Estimated Fair Values of Company's Debt (Detail) (Significant unobservable inputs, Level 3 [Member], USD $)	Mar. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified
Carrying Value [Member]	'	'	'
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]	'	'	'
Debt	$777,670	$328,473	$345,408
Fair Value [Member]	'	'	'
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]	'	'	'
Debt	$823,603	$364,329	$359,753

FAIR_VALUE_MEASUREMENTS_Summar

FAIR VALUE MEASUREMENTS - Summary of Financial Assets at Fair Value (Detail) (USD $)	Mar. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'	'
Available-for-sale investments included in Reclamation deposits	$75,315	$74,921	$72,718
Recurring [Member] | Quoted prices in active markets for identical assets - Level 1 [Member]	'	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'	'
Available-for-sale investments included in Restricted investments and bond collateral	'	'	191
Available-for-sale investments included in Reclamation deposits	'	0	1,039
Total assets	'	'	1,230
Recurring [Member] | Significant other observable inputs - Level 2 [Member]	'	'	'
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
Total assets	'	'	0
Recurring [Member] | Significant unobservable inputs, Level 3 [Member]	'	'	'
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
Total assets	'	'	0
Recurring [Member] | Fair Value [Member]	'	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'	'
Available-for-sale investments included in Restricted investments and bond collateral	'	'	191
Available-for-sale investments included in Reclamation deposits	'	'	1,039
Total assets	'	'	$1,230

RESTRICTED_STOCK_UNITS_STOCK_O2

RESTRICTED STOCK UNITS, STOCK OPTIONS, AND STOCK APPRECIATION RIGHTS (SARs) - Compensation Expense from Share-Based Arrangements (Detail) (USD $)	3 Months Ended		12 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2014	Mar. 31, 2013	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]	'	'	'	'	'
Recognition of fair value of restricted stock units, stock options, and stock appreciation rights over vesting period; and issuance of common stock	$728	$1,663	$2,967	$3,088	$1,969
Contributions of stock to the Company's 401(k) plan	0	723	2,355	2,952	2,752
Total share-based compensation expense	$728	$2,386	$5,322	$6,040	$4,721

RESTRICTED_STOCK_UNITS_STOCK_O3

RESTRICTED STOCK UNITS, STOCK OPTIONS, AND STOCK APPRECIATION RIGHTS (SARs) - Summary of Restricted Stock Unit Activity (Detail) (Restricted Stock Units (RSUs) [Member], USD $)	1 Months Ended	3 Months Ended		12 Months Ended
In Thousands, except Share data, unless otherwise specified	Apr. 30, 2013	Mar. 31, 2014		Dec. 31, 2013		Dec. 31, 2012	Dec. 31, 2011
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'	'		'		'	'
Award vesting period	'	'		'3 years		'	'
Units, Beginning Balance	'	588,727		680,185		'	'
Units, Granted	54,730	0		103,730		'	'
Units, Vested	'	0		-195,940		'	'
Units, Expired or forfeited	'	'		0		'	'
Units, Ending Balance	'	588,727		588,727		680,185	'
Weighted Average Grant Date Fair Value, Period Start (in USD per share)	'	$9.37		$8.88		'	'
Weighted Average Grant Date Fair Value, Granted (in USD per share)	'	$0		$11.70		$7.57	$14.99
Weighted Average Grant Date Fair Value, Vested (in USD per share)	'	$0		$8.62		'	'
Weighted Average Grant Date Fair Value, Expired or forfeited (in USD per share)	'	'		$0		'	'
Weighted Average Grant Date Fair Value, Period End (in USD per share)	'	$9.37		$9.37		$8.88	'
Unamortized Compensation Expense	'	$1,618	[1]	$2,346	[1]	'	'
Recognition period of unamortized compensation expense (in years)	'	'3 years		'3 years		'	'
Total grant-date fair value of Restricted Stock Units that vested	'	'		$1,689		$1,336	$1,757
Scenario, Previously Reported [Member]	'	'		'		'	'
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'	'		'		'	'
Units, Ending Balance	'	'		587,975		'	'
Weighted Average Grant Date Fair Value, Period End (in USD per share)	'	'		$9.46		'	'
[1]	Expected to be recognized over the next three years.

RESTRICTED_STOCK_UNITS_STOCK_O4

RESTRICTED STOCK UNITS, STOCK OPTIONS, AND STOCK APPRECIATION RIGHTS (SARs) - Summary of Stock Option Activity (Detail) (Stock Options [Member], USD $)	3 Months Ended	12 Months Ended
	Mar. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Stock Options [Member]	'	'	'	'
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'	'	'	'
Award vesting period	'	'3 years	'	'
Outstanding at beginning of year (in shares)	145,806	170,823	'	'
Expired or forfeited (in shares)	0	-25,017	'	'
Exercised (in shares)	0	'	'	'
Outstanding at end of year (in shares)	145,806	145,806	170,823	'
Exercisable at end of year, (in shares)	'	145,806	'	'
Outstanding at beginning of year, Weighted Average Exercise Price (in USD per share)	$21.97	$21.30	'	'
Expired or forfeited, Weighted Average Exercise Price (in USD per share)	$0	$17.41	'	'
Exercised, Weighted Average Exercise Price (in USD per share)	$0	'	'	'
Outstanding at end of year, Weighted Average Exercise Price (in USD per share)	$21.97	$21.97	$21.30	'
Exercisable at end of year, Weighted Average Exercise Price (in USD per share)	'	$21,970	'	'
Options, Outstanding, Weighted Average Remaining Contractual Term (in years)	'4 years	'4 years 3 months 1 day	'	'
Options, Exercisable, Weighted Average Remaining Contractual Term (in years)	'4 years	'4 years 3 months 1 day	'	'
Aggregate Intrinsic Value, Exercises in period	'	$0	$0	$86,000
Aggregate Intrinsic Value, Outstanding at end of year	1,139,000	0	'	'
Aggregate Intrinsic Value, Exercisable at end of year	'	0	'	'
Outstanding and exercisable at end of year Unamortized Compensation Expense	0	0	'	'
Total Grant-Date Fair Value of Stock Options that Vested	'	$0	$0	$538,000
Life of award	'	'10 years	'	'
Shares, granted	0	'	'	'

RESTRICTED_STOCK_UNITS_STOCK_O5

RESTRICTED STOCK UNITS, STOCK OPTIONS, AND STOCK APPRECIATION RIGHTS (SARs) - Summary of Stock Appreciation Rights (Detail) (Stock Appreciation Rights (SARs) [Member], USD $)	3 Months Ended	12 Months Ended
In Thousands, except Share data, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Stock Appreciation Rights (SARs) [Member]	'	'	'	'
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'	'	'	'
Life of award	'	'10 years	'	'
Award vesting period	'	'3 years	'	'
Outstanding at beginning of year (in shares)	70,734	70,734	'	'
Expired or forfeited (in shares)	0	0	'	'
Outstanding at end of year (in shares)	45,067	70,734	70,734	'
Exercisable at end of year, (in shares)	'	70,734	'	'
Outstanding at beginning of year, Weighted Average Exercise Price (in USD per share)	$22.60	$22.60	'	'
Expired or forfeited, Weighted Average Exercise Price (in USD per share)	$0	$0	'	'
Exercised (in shares)	-25,667	'	'	'
Exercised, Weighted Average Exercise Price (in USD per share)	$0	'	'	'
Outstanding at end of year, Weighted Average Exercise Price (in USD per share)	$23.95	$22.60	$22.60	'
Options, Outstanding, Weighted Average Remaining Contractual Term (in years)	'1 year 10 months 24 days	'1 year 8 months 12 days	'	'
Options, Exercisable, Weighted Average Remaining Contractual Term (in years)	'1 year 10 months 24 days	'	'	'
Aggregate Intrinsic Value, Outstanding at end of year	$352	$0	'	'
Outstanding and exercisable at end of year Unamortized Compensation Expense	0	0	'	'
Total grant-date fair value of SARs that vested (less than $0.1 million in 2012 and 2011)	'	'	$100	$100
Shares, granted	0	'	'	'

RESTRICTED_STOCK_UNITS_STOCK_O6

RESTRICTED STOCK UNITS, STOCK OPTIONS, AND STOCK APPRECIATION RIGHTS Additional Information (Details) (USD $)	3 Months Ended	1 Months Ended		3 Months Ended	12 Months Ended		1 Months Ended
	Mar. 31, 2014	Apr. 23, 2014	Apr. 30, 2013	Mar. 31, 2014	Dec. 31, 2013	Dec. 31, 2013	Apr. 30, 2013	Apr. 30, 2013
	Common Stock	Common Stock	Restricted Stock Units (RSUs) [Member]	Restricted Stock Units (RSUs) [Member]	Restricted Stock Units (RSUs) [Member]	Amended And Restated 2007 Equity Incentive Stock Plan [Member]	Vesting Ratably Over Vesting Period [Member]	Performance Based [Member]
		Subsequent Event					Restricted Stock Units (RSUs) [Member]	Restricted Stock Units (RSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'	'	'	'	'	'	'	'
Units, Granted	'	'	54,730	0	103,730	'	27,366	27,364
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights	'	'	'	'	'	'	'P3Y	'three
Non Employee Directors Annual Equity Awards Amount	'	'	'	'	'	$7,000	'	'
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant	'	'	'	'	'	49,050	'	'
Conversion of convertible notes and securities, shares	264,641	53,486	'	'	'	'	'	'

STOCKHOLDERS_EQUITY_AND_ACCUMU2

STOCKHOLDERS' EQUITY AND ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) - Additional Information (Detail) (USD $)	12 Months Ended			3 Months Ended	12 Months Ended		1 Months Ended	12 Months Ended
In Millions, except Share data, unless otherwise specified	Dec. 31, 2012	Mar. 31, 2014	Dec. 31, 2013	Mar. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Apr. 23, 2014	Dec. 31, 2012
				Preferred Stock [Member]	Preferred Stock [Member]	Preferred Stock [Member]	Preferred Stock [Member]	Common Stock
							Subsequent Event
Class of Stock [Line Items]	'	'	'	'	'	'	'	'
Common stock, par value (in USD per share)	$2.50	$2.50	$2.50	'	'	'	'	'
Cumulative dividends paid on Series A Convertible Exchangeable Preferred Stock (in USD per share)	'	'	'	$2.13	$2.13	'	'	'
Preferred Stock, Redemption value	'	'	'	'	$100	'	'	'
Cumulative dividends paid on Series A Convertible Exchangeable Preferred Stock	$19.90	'	'	'	'	'	'	'
Conversion of Stock, Shares Converted	'	'	'	38,737	'	169	7,830	'
Conversion of Stock, Shares Issued	'	'	'	'	'	'	'	1,152

STOCKHOLDERS_EQUITY_AND_ACCUMU3

STOCKHOLDERS' EQUITY AND ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) - Accumulated Other Comprehensive Income (Details) (USD $)	3 Months Ended		12 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2014	Mar. 31, 2013	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Equity [Abstract]	'	'	'	'	'	'
Accumulated Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Net of Tax	'	'	($32,547)	($122,246)	($95,624)	($32,049)
Accumulated Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, Net of Tax	'	'	0	57	325	525
Accumulated Other Comprehensive Income Tax Effect of Other Comprehensive Income Gains	'	'	-31,048	-26,156	-26,156	-26,156
Accumulated Other Comprehensive Income (Loss), Net of Tax	-63,369	'	-63,595	-148,345	-121,455	-57,680
Other Comprehensive Income Loss Pension And Postretirement Medical Benefits Adjustment	'	'	89,699	-26,622	-63,575	'
Unrealized and realized gains and losses on available-for-sale securities	'	'	-57	-268	-200	'
Tax effect of other comprehensive income gains	-138	0	-4,892	0	0	'
Other comprehensive income (loss)	$226	$1,742	$84,750	($26,890)	($63,775)	'

STOCKHOLDERS_EQUITY_AND_ACCUMU4

STOCKHOLDERS' EQUITY AND ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) - Changes in Accumulated Other Comprehensive Income by component (Details) (USD $)	3 Months Ended	12 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013	Dec. 31, 2011	Dec. 31, 2010
Accumulated Other Comprehensive Income (Loss) [Line Items]	'	'	'	'
Balance at beginning of period	($63,595)	($148,345)	($121,455)	($57,680)
Other comprehensive income before reclassifications	-138	77,267	'	'
Amounts reclassified from accumulated other comprehensive income (loss)	364	7,483	'	'
Balance at end of period	-63,369	-63,595	-121,455	-57,680
Accumulated Net Unrealized Investment Gain (Loss) [Member]	'	'	'	'
Accumulated Other Comprehensive Income (Loss) [Line Items]	'	'	'	'
Balance at beginning of period	'	57	'	'
Other comprehensive income before reclassifications	'	-45	'	'
Amounts reclassified from accumulated other comprehensive income (loss)	'	-12	'	'
Balance at end of period	'	0	'	'
Tax Effect of Other Comprehensive Income Gains [Member]	'	'	'	'
Accumulated Other Comprehensive Income (Loss) [Line Items]	'	'	'	'
Balance at beginning of period	-31,048	-26,156	'	'
Other comprehensive income before reclassifications	-138	-4,892	'	'
Balance at end of period	-31,186	-31,048	'	'
Accumulated Defined Benefit Plans Adjustment [Member] | Postretirement Medical Benefits [Member]	'	'	'	'
Accumulated Other Comprehensive Income (Loss) [Line Items]	'	'	'	'
Balance at beginning of period	-20,292	-77,527	'	'
Other comprehensive income before reclassifications	'	53,230	'	'
Amounts reclassified from accumulated other comprehensive income (loss)	5	4,005	'	'
Balance at end of period	-20,287	-20,292	'	'
Accumulated Defined Benefit Plans Adjustment [Member] | Pension Benefits [Member]	'	'	'	'
Accumulated Other Comprehensive Income (Loss) [Line Items]	'	'	'	'
Balance at beginning of period	-12,255	-44,719	'	'
Other comprehensive income before reclassifications	'	28,974	'	'
Amounts reclassified from accumulated other comprehensive income (loss)	359	3,490	'	'
Balance at end of period	($11,896)	($12,255)	'	'

STOCKHOLDERS_EQUITY_AND_ACCUMU5

STOCKHOLDERS' EQUITY AND ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) - Changes in Accumulated Other Comprehensive Income (Details) (USD $)

12 Months Ended

3 Months Ended

12 Months Ended

3 Months Ended

12 Months Ended

In Thousands, unless otherwise specified

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2011

Dec. 31, 2013

Dec. 31, 2013

Mar. 31, 2014

Dec. 31, 2013

Mar. 31, 2014

Dec. 31, 2013

Accumulated Net Unrealized Investment Gain (Loss) [Member]

Other Income

Postretirement Medical Benefits [Member]

Postretirement Medical Benefits [Member]

Pension Benefits [Member]

Pension Benefits [Member]

Accumulated Net Unrealized Investment Gain (Loss) [Member]

Accumulated Defined Benefit Plans Adjustment [Member]

Accumulated Defined Benefit Plans Adjustment [Member]

Accumulated Defined Benefit Plans Adjustment [Member]

Accumulated Defined Benefit Plans Adjustment [Member]

Reclassification out of Accumulated Other Comprehensive Income [Line Items]

'

'

'

'

'

'

'

'

'

Other Comprehensive Income (Loss), Reclassification Adjustment for Sale of Securities Included in Net Income, before Tax

'

'

'

'

($12)

[1]

'

'

'

'

Unrealized and realized gains and losses on available-for-sale securities

-57

-268

-200

-12

[1]

'

'

'

'

'

Defined Benefit Plan, Amounts Recognized in Other Comprehensive Income (Loss), Net Gain (Loss), before Tax

'

'

'

'

'

164

[1],[2]

4,641

[1],[3]

359

[1],[4]

3,490

[1],[5]

Defined Benefit Plan, Amounts Recognized in Other Comprehensive Income (Loss), Net Prior Service Cost, before Tax

'

'

'

'

'

-159

[1],[2]

-636

[1],[3]

'

'

Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Adjustment, before Tax

'

'

'

'

'

$5

[1]

$4,005

[1]

'

'

[1]

Amounts in parentheses indicate debits to income/loss.

[2]

These accumulated other comprehensive loss components are included in the computation of net periodic postretirement medical cost. (See Note 5 - Postretirement Medical Benefits for additional details)

[3]

These accumulated other comprehensive income components are included in the computation of net periodic postretirement medical cost.

[4]

These accumulated other comprehensive loss components are included in the computation of net periodic pension cost. (See Note 5 - Pension for additional details)

[5]

These accumulated other comprehensive income components are included in the computation of net periodic pension cost.

INCOME_TAX_Components_of_Incom

INCOME TAX - Components of Income Tax (Details) (USD $)	3 Months Ended		12 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2014	Mar. 31, 2013	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Current:	'	'	'	'	'
Current federal taxes	'	'	($2)	($8)	($174)
Current state taxes	'	'	112	98	168
Current tax expense (benefit)	'	'	110	90	-6
Deferred:	'	'	'	'	'
Deferred federal taxes	'	'	-4,189	0	0
Deferred state taxes	'	'	-703	0	-420
Deferred tax expense (benefit)	'	'	-4,892	0	-420
Income tax benefit	($110)	$28	($4,782)	$90	($426)

INCOME_TAX_Reconciliation_of_E

INCOME TAX - Reconciliation of Effective Tax Rate (Details) (USD $)	3 Months Ended		12 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2014	Mar. 31, 2013	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Income Tax Disclosure [Abstract]	'	'	'	'	'
Computed tax benefit at statutory rate	'	'	($4,389)	($4,615)	($12,683)
Increase (decrease) in tax expense resulting from:	'	'	'	'	'
Tax depletion in excess of basis	'	'	-6,187	-4,782	-3,820
Non-deductible interest expense and convertible debt valuation	'	'	0	0	3,717
Noncontrolling interest	'	'	1,167	2,188	1,283
State income taxes, net	'	'	-2,506	-3,427	-4,548
Change in valuation allowance for net deferred tax assets	'	'	15	8,571	2,923
Indian Coal Tax Credits	'	'	92	83	-122
Federal and state NOL expiration	'	'	0	153	11,226
Income Tax Reconciliation Change in State Effective Tax Rate	'	'	6,202	2,049	1,310
Other, net	'	'	824	-130	288
Income tax benefit	($110)	$28	($4,782)	$90	($426)

INCOME_TAX_Components_of_Defer

INCOME TAX - Components of Deferred Tax Assets And Liabilities (Details) (USD $)	Dec. 31, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified
Deferred tax assets:	'	'
Federal net operating loss carryforwards	$89,698	$84,330
State net operating loss carryforwards	26,509	28,700
Alternative minimum tax credit carryforwards	7,179	6,973
Charitable contribution carryforwards	146	132
Indian Coal Tax Credit carryforwards	25,499	25,591
Accruals for the following:	'	'
Workersb compensation	2,726	3,592
Postretirement medical benefit and pension obligations	106,912	138,710
Incentive plans	1,606	1,995
Asset retirement obligations	68,989	77,698
Deferred revenues	18,919	22,500
Excess of pneumoconiosis benefit obligation over trust assets	3,262	3,185
Acquisition Costs	1,276	198
Restructuring	1,909	0
Other accruals	6,656	6,035
Total gross deferred assets	361,286	399,639
Less valuation allowance	-264,464	-293,504
Net deferred tax assets	96,822	106,135
Deferred tax liabilities:	'	'
Property, plant and equipment, differences due to depreciation and amortization	-94,868	-104,992
Other	-1,954	-1,143
Total gross deferred tax liabilities	-96,822	-106,135
Net deferred tax asset	$0	$0

INCOME_TAX_Summary_of_Federal_

INCOME TAX - Summary of Federal Net Operating Loss Carryforwards (Details) (Federal [Member], USD $)	Dec. 31, 2013
In Thousands, unless otherwise specified
Operating Loss Carryforwards [Line Items]	'
Net operating loss carryforwards	$264,922
2018 [Member]	'
Operating Loss Carryforwards [Line Items]	'
Net operating loss carryforwards	28
2019 [Member]	'
Operating Loss Carryforwards [Line Items]	'
Net operating loss carryforwards	88,429
2020 [Member]	'
Operating Loss Carryforwards [Line Items]	'
Net operating loss carryforwards	32
2021 [Member]	'
Operating Loss Carryforwards [Line Items]	'
Net operating loss carryforwards	20
After 2022 [Member]	'
Operating Loss Carryforwards [Line Items]	'
Net operating loss carryforwards	$176,413

INCOME_TAX_Additional_Informat

INCOME TAX - Additional Information (Details) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012
Income Tax Disclosure [Abstract]	'	'
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate	34.00%	'
Possible Reduction To Deferred Tax Asset, Tax Effected	$4,500,000	'
Indian Coal Tax Credit carryforwards	25,499,000	25,591,000
Alternative minimum tax credit carryforwards	7,179,000	6,973,000
State and Local Jurisdiction [Member]	'	'
Operating Loss Carryforwards [Line Items]	'	'
Net operating loss carryforwards	$701,000,000	'

INCOME_TAX_Income_tax_benefit_

INCOME TAX - Income tax benefit on amounts recognized in OCI (Details) (USD $)	3 Months Ended		12 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2014	Mar. 31, 2013	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Income Tax Disclosure [Abstract]	'	'	'	'	'
Pre allocation	'	'	$110	$90	($6)
Tax allocation	'	'	-4,892	0	-420
Income tax expense (benefit)	-110	28	-4,782	90	-426
Comprehensive Income, Tax	'	'	110	'	'
Other comprehensive income, pension before tax	'	'	32,464	'	'
Other comprehensive income, post retirement benefits before tax	'	'	57,235	'	'
Unrealized and realized gains and losses on available-for-sale securities	'	'	-57	-268	-200
Other comprehensive income before tax	'	'	89,642	'	'
Pension, tax	'	'	1,772	'	'
Post retirement benefits, tax	'	'	3,123	'	'
Unrealized gain (loss) on securities, tax	'	'	-3	'	'
Tax effect of other comprehensive income gains	$138	$0	$4,892	$0	$0

COMMITMENTS_AND_CONTINGENCIES_1

COMMITMENTS AND CONTINGENCIES - Purchase Commitments (Details) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2013
	gal
Purchase Commitment, Excluding Long-term Commitment [Line Items]	'
Minimum annual purchase requirement (in gallons of diesel fuel)	4,000,000
Coal Supply Agreements [Member]	'
Purchase Commitment, Excluding Long-term Commitment [Line Items]	'
Number of Agreements	2
Purchase obligation due in next fiscal year	17.9
Purchase obligation due in seond fiscal year	2.9

EARNINGS_PER_SHARE_Antidilutiv

EARNINGS PER SHARE - Antidilutive securities excluded from the computation of earnings per share (Details)	3 Months Ended		12 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2014	Mar. 31, 2013	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Class of Stock [Line Items]	'	'	'	'	'
Shares excluded from diluted shares calculation	1,607	2,071	1,898	2,071	1,727
Convertible securities	'	'	'	'	'
Class of Stock [Line Items]	'	'	'	'	'
Shares excluded from diluted shares calculation	828	1,093	'	'	'
Restricted stock units, stock options and SARs	'	'	'	'	'
Class of Stock [Line Items]	'	'	'	'	'
Shares excluded from diluted shares calculation	779	978	'	'	'

COMMITMENTS_AND_CONTINGENCIES_2

COMMITMENTS AND CONTINGENCIES - Leases (Details) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Future minimum capital lease payments:	'	'	'
2014	$5,949,000	'	'
2015	2,419,000	'	'
2016	1,548,000	'	'
2017	495,000	'	'
2018	316,000	'	'
Thereafter	0	'	'
Total minimum lease payments	10,727,000	'	'
Less imputed interest	-574,000	'	'
Present value of minimum capital lease payments	10,153,000	'	'
Future minimum operating lease payments:	'	'	'
2014	7,896,000	'	'
2015	5,156,000	'	'
2016	2,584,000	'	'
2017	1,256,000	'	'
2018	515,000	'	'
Thereafter	0	'	'
Total	17,407,000	'	'
Rental expense under operating leases	11,800,000	9,500,000	7,700,000
Royalty expense, coal reserves	43,600,000	40,100,000	38,800,000
Property, plant and equipment and mine development assets [Member]	'	'	'
Gross value and accumulated amortization of assets under capital leases:	'	'	'
Gross value	24,982,000	34,677,000	'
Accumulated amortization	$11,983,000	$15,887,000	'

BUSINESS_SEGMENT_INFORMATION_S

BUSINESS SEGMENT INFORMATION - Summarized Financial Information by Segment (Detail) (USD $)

3 Months Ended

12 Months Ended

In Thousands, unless otherwise specified

Mar. 31, 2014

Dec. 31, 2013

Sep. 30, 2013

Jun. 30, 2013

Mar. 31, 2013

Dec. 31, 2012

Sep. 30, 2012

Jun. 30, 2012

Mar. 31, 2012

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2011

segments

segments

Segment Reporting Information [Line Items]

'

'

'

'

'

'

'

'

'

'

'

'

Number of Reportable Segments

4

'

'

'

'

'

'

'

'

4

'

'

Revenues

$180,202

'

'

'

$161,448

'

'

'

'

$674,686

$600,437

$501,713

Restructuring charges

397

'

'

'

0

'

'

'

'

5,078

0

0

Operating income (loss)

8,053

-883

8,536

11,975

5,734

8,597

15,451

-4,262

9,086

25,362

28,872

10,626

Depreciation, depletion, and amortization

16,059

'

'

'

14,426

'

'

'

'

67,231

57,145

45,594

Total assets

1,407,147

946,685

'

'

943,015

936,115

'

'

'

946,685

936,115

759,172

Capital expenditures

3,050

'

'

'

5,301

'

'

'

'

28,591

21,032

27,594

Coal Segment [Member]

'

'

'

'

'

'

'

'

'

'

'

'

Segment Reporting Information [Line Items]

'

'

'

'

'

'

'

'

'

'

'

'

Revenues

158,190

'

'

'

142,112

'

'

'

'

587,119

519,152

414,928

Restructuring charges

0

'

'

'

'

'

'

'

'

0

'

'

Operating income (loss)

13,447

'

'

'

13,472

'

'

'

'

44,471

48,235

27,453

Depreciation, depletion, and amortization

13,459

'

'

'

11,801

'

'

'

'

56,698

46,639

35,112

Total assets

697,916

705,816

'

'

711,128

703,315

'

'

'

705,816

703,315

510,507

Capital expenditures

3,053

'

'

'

5,010

'

'

'

'

27,064

18,804

24,678

Power [Member]

'

'

'

'

'

'

'

'

'

'

'

'

Segment Reporting Information [Line Items]

'

'

'

'

'

'

'

'

'

'

'

'

Revenues

22,012

'

'

'

19,336

'

'

'

'

87,567

81,285

86,785

Restructuring charges

397

'

'

'

'

'

'

'

'

5,078

'

'

Operating income (loss)

1,744

'

'

'

-1,003

'

'

'

'

4,907

8,244

12,119

Depreciation, depletion, and amortization

2,524

'

'

'

2,531

'

'

'

'

10,179

10,085

10,176

Total assets

167,998

180,684

'

'

186,309

189,599

'

'

'

180,684

189,599

194,730

Capital expenditures

35

'

'

'

134

'

'

'

'

790

2,070

2,119

Heritage [Member]

'

'

'

'

'

'

'

'

'

'

'

'

Segment Reporting Information [Line Items]

'

'

'

'

'

'

'

'

'

'

'

'

Revenues

0

'

'

'

0

'

'

'

'

0

0

0

Restructuring charges

0

'

'

'

'

'

'

'

'

0

'

'

Operating income (loss)

-3,830

'

'

'

-4,175

'

'

'

'

-14,498

-14,711

-19,675

Depreciation, depletion, and amortization

0

'

'

'

0

'

'

'

'

0

0

0

Total assets

15,622

15,497

'

'

15,877

15,508

'

'

'

15,497

15,508

13,769

Capital expenditures

0

'

'

'

0

'

'

'

'

0

0

0

Corporate [Member]

'

'

'

'

'

'

'

'

'

'

'

'

Segment Reporting Information [Line Items]

'

'

'

'

'

'

'

'

'

'

'

'

Revenues

0

'

'

'

0

'

'

'

'

0

0

0

Restructuring charges

0

'

'

'

'

'

'

'

'

0

'

'

Operating income (loss)

-3,308

'

'

'

-2,560

'

'

'

'

-9,518

-12,896

-9,271

Depreciation, depletion, and amortization

76

'

'

'

94

'

'

'

'

354

421

306

Total assets

525,611

44,688

'

'

29,701

27,693

'

'

'

44,688

27,693

40,166

Capital expenditures

($38)

'

'

'

$157

'

'

'

'

$737

$158

$797

BUSINESS_SEGMENT_INFORMATION_R

BUSINESS SEGMENT INFORMATION - Reconciliation of Segment Operating Income to Income (Loss) (Detail) (USD $)

3 Months Ended

12 Months Ended

In Thousands, unless otherwise specified

Mar. 31, 2014

Dec. 31, 2013

Sep. 30, 2013

Jun. 30, 2013

Mar. 31, 2013

Dec. 31, 2012

Sep. 30, 2012

Jun. 30, 2012

Mar. 31, 2012

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2011

Segment Reporting [Abstract]

'

'

'

'

'

'

'

'

'

'

'

'

Income (loss) from operations

$8,053

($883)

$8,536

$11,975

$5,734

$8,597

$15,451

($4,262)

$9,086

$25,362

$28,872

$10,626

Loss on extinguishment of debt

'

'

'

'

'

'

'

'

'

-64

-1,986

-17,030

Interest expense

-20,798

'

'

'

-10,160

'

'

'

'

-39,937

-42,677

-29,769

Interest income

302

'

'

'

297

'

'

'

'

1,366

1,496

1,444

Other income (loss)

93

'

'

'

70

'

'

'

'

364

723

-2,572

Loss before income taxes

($19,140)

'

'

'

($4,059)

'

'

'

'

($12,909)

($13,572)

($37,301)

BUSINESS_SEGMENT_INFORMATION_C

BUSINESS SEGMENT INFORMATION - Customer Concentration Disclosures (Details) (USD $)

3 Months Ended

12 Months Ended

In Thousands, unless otherwise specified

Mar. 31, 2014

Dec. 31, 2013

Sep. 30, 2013

Jun. 30, 2013

Mar. 31, 2013

Dec. 31, 2012

Sep. 30, 2012

Jun. 30, 2012

Mar. 31, 2012

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2011

Revenue, Major Customer [Line Items]

'

'

'

'

'

'

'

'

'

'

'

'

Revenues

$180,202

$173,947

$176,792

$162,499

$161,448

$159,027

$161,332

$132,842

$147,236

$674,686

$600,437

$501,713

Total Revenue [Member] | Customer Concentration Risk [Member]

'

'

'

'

'

'

'

'

'

'

'

'

Revenue, Major Customer [Line Items]

'

'

'

'

'

'

'

'

'

'

'

'

Concentration Risk, Percentage

'

'

'

'

'

'

'

'

'

77.00%

80.00%

81.00%

Customer A [Member] | Coal Segment [Member]

'

'

'

'

'

'

'

'

'

'

'

'

Revenue, Major Customer [Line Items]

'

'

'

'

'

'

'

'

'

'

'

'

Revenues

'

'

'

'

'

'

'

'

'

117,545

126,982

120,243

Customer B [Member] | Coal Segment [Member]

'

'

'

'

'

'

'

'

'

'

'

'

Revenue, Major Customer [Line Items]

'

'

'

'

'

'

'

'

'

'

'

'

Revenues

'

'

'

'

'

'

'

'

'

112,061

[1]

96,718

[1]

0

[1]

Customer C [Member] | Coal Segment [Member]

'

'

'

'

'

'

'

'

'

'

'

'

Revenue, Major Customer [Line Items]

'

'

'

'

'

'

'

'

'

'

'

'

Revenues

'

'

'

'

'

'

'

'

'

89,266

81,981

81,353

Customer D [Member] | Power [Member]

'

'

'

'

'

'

'

'

'

'

'

'

Revenue, Major Customer [Line Items]

'

'

'

'

'

'

'

'

'

'

'

'

Revenues

'

'

'

'

'

'

'

'

'

86,390

80,109

85,639

Customer E [Member] | Coal Segment [Member]

'

'

'

'

'

'

'

'

'

'

'

'

Revenue, Major Customer [Line Items]

'

'

'

'

'

'

'

'

'

'

'

'

Revenues

'

'

'

'

'

'

'

'

'

85,929

66,128

65,224

Customer F [Member] | Coal Segment [Member]

'

'

'

'

'

'

'

'

'

'

'

'

Revenue, Major Customer [Line Items]

'

'

'

'

'

'

'

'

'

'

'

'

Revenues

'

'

'

'

'

'

'

'

'

$25,958

[2]

$26,525

[2]

$52,835

[2]

[1]

The revenue from Customer B did not exceed 10% in 2011

[2]

The revenue from Customer F did not exceed 10% in

QUARTERLY_FINANCIAL_DATA_UNAUD2

QUARTERLY FINANCIAL DATA (UNAUDITED) (Details) (USD $)	3 Months Ended									12 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Quarterly Financial Information Disclosure [Abstract]	'	'	'	'	'	'	'	'	'	'	'	'
Revenues	$180,202	$173,947	$176,792	$162,499	$161,448	$159,027	$161,332	$132,842	$147,236	$674,686	$600,437	$501,713
Operating income (loss)	8,053	-883	8,536	11,975	5,734	8,597	15,451	-4,262	9,086	25,362	28,872	10,626
Net Income (loss) applicable to common shareholders	($19,291)	($5,131)	$2,421	($622)	($2,725)	($3,963)	$7,282	($12,423)	$518	($6,057)	($8,586)	($34,460)
Basic income (loss) per common share	'	($0.35)	$0.17	($0.04)	($0.19)	($0.28)	$0.52	($0.89)	$0.04	'	'	'

QUARTERLY_FINANCIAL_DATA_UNAUD3

QUARTERLY FINANCIAL DATA (UNAUDITED) - Additional information (Details) (USD $)	3 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2013	Mar. 31, 2012	Dec. 31, 2012	Jun. 30, 2012
		Kemmerer Mine	Kemmerer Mine	Kemmerer Mine
Other information:	'	'	'	'
Deferred revenue	'	'	$2.20	$2.20
Expected increase in revenues and operating income	'	1.3	'	'
Depreciation	$1.50	'	'	'

SUPPLEMENTAL_CONSOLIDATING_FIN2

SUPPLEMENTAL CONSOLIDATING FINANCIAL INFORMATION - Supplemental Consolidating Balance Sheet Information (Detail) (USD $)	Mar. 31, 2014	Dec. 31, 2013	Mar. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
In Thousands, unless otherwise specified
Condensed Financial Statements, Captions [Line Items]	'	'	'	'	'	'
Long-term Debt and Capital Lease Obligations, Current	$48,586	$44,343	'	$23,791	'	'
Current assets:	'	'	'	'	'	'
Cash and cash equivalents	61,900	61,110	40,852	31,610	30,783	5,775
Receivables:	'	'	'	'	'	'
Trade	64,715	66,196	'	60,037	'	'
Contractual third-party reclamation receivables	8,213	8,487	'	10,207	'	'
Intercompany receivable/payable	0	0	'	0	'	'
Other	1,375	5,086	'	3,220	'	'
Total receivables	74,303	79,769	'	73,464	'	'
Inventories	35,447	39,972	'	37,734	'	'
Deferred income taxes	'	0	'	'	'	'
Restricted investments and bond collateral	16,900	5,998	'	0	'	'
Other current assets	16,643	18,190	'	16,504	'	'
Total current assets	205,193	205,039	'	159,312	'	'
Property, plant and equipment:	'	'	'	'	'	'
Land and mineral rights	278,198	278,188	'	261,741	'	'
Plant and equipment	673,189	657,696	'	635,720	'	'
Gross property, plant and equipment	951,387	935,884	'	897,461	'	'
Less accumulated depreciation, depletion and amortization	461,754	445,848	'	384,621	'	'
Net property, plant and equipment	489,633	490,036	'	512,840	'	'
Advanced coal royalties	7,263	7,311	'	4,316	'	'
Reclamation deposits	75,315	74,921	'	72,718	'	'
Restricted investments and bond collateral	523,483	69,235	'	87,209	'	'
Contractual third-party reclamation receivables, less current portion	88,036	88,303	'	84,158	'	'
Intangible assets	1,099	1,520	'	3,203	'	'
Investment in subsidiaries	0	0	'	0	'	'
Other assets	17,125	10,320	'	12,359	'	'
Total Assets	1,407,147	946,685	943,015	936,115	759,172	'
Accounts payable and accrued expenses:	'	'	'	'	'	'
Total current liabilities	235,686	213,028	'	170,912	'	'
Shareholders' deficit:	'	'	'	'	'	'
Common stock	37,155	36,479	'	35,502	'	'
Other paid-in capital	134,952	134,861	'	130,852	'	'
Accumulated other comprehensive loss	-63,369	-63,595	'	-148,345	-121,455	-57,680
Accumulated earnings (deficit)	-315,075	-295,784	'	-289,727	'	'
Total Westmoreland Coal Company shareholders' deficit	-206,216	-187,879	'	-271,558	'	'
Noncontrolling interest	'	0	'	-14,673	'	'
Total equity (deficit)	-206,216	-187,879	'	-286,231	-249,858	-162,355
Total Liabilities and Shareholders' Deficit	1,407,147	946,685	'	936,115	'	'
Accounts Payable and Other Accrued Liabilities, Current	62,598	57,507	'	52,093	'	'
Production Taxes	46,794	41,905	'	33,228	'	'
Workers' Compensation Liability, Current	712	717	'	820	'	'
Postretirement Medical Benefits Current	13,955	13,955	'	14,068	'	'
Supplemental Executive Retirement Plan Current	390	390	'	390	'	'
Deferred Revenue, Current	16,034	14,068	'	12,822	'	'
Asset Retirement Obligation, Current	22,227	23,353	23,154	22,238	'	'
Other Sundry Liabilities, Current	24,390	16,790	'	11,462	'	'
Long-term debt, less current installments	751,645	295,494	'	337,198	'	'
Workers' Compensation Liability, Noncurrent	6,680	6,744	'	8,710	'	'
Excess of black lung benefit obligation over trust assets	9,376	8,675	'	8,356	'	'
Other Postretirement Defined Benefit Plan, Liabilities, Noncurrent	271,275	270,374	'	319,775	'	'
Defined Benefit Pension Plan, Liabilities, Noncurrent	23,524	24,176	'	54,250	'	'
Deferred Revenue, Noncurrent	43,299	46,567	'	56,891	'	'
Asset Retirement Obligations, Noncurrent	259,036	256,511	240,335	241,609	'	'
Intangible Liabilities Non Current	5,339	5,606	'	6,625	'	'
Other Liabilities, Noncurrent	7,503	7,389	'	18,020	'	'
Intercompany Payable	0	0	'	0	'	'
Liabilities	1,613,363	1,134,564	'	1,222,346	'	'
Preferred Stock, Value, Issued	121	160	'	160	'	'
Parent Company [Member]	'	'	'	'	'	'
Condensed Financial Statements, Captions [Line Items]	'	'	'	'	'	'
Long-term Debt and Capital Lease Obligations, Current	'	20,392	'	-1,548	'	'
Current assets:	'	'	'	'	'	'
Cash and cash equivalents	28,759	25,326	10,971	14,836	26,140	271
Receivables:	'	'	'	'	'	'
Trade	'	0	'	0	'	'
Contractual third-party reclamation receivables	'	0	'	0	'	'
Intercompany receivable/payable	'	-16,273	'	-17,309	'	'
Other	'	1,616	'	680	'	'
Total receivables	-14,799	-14,657	'	-16,629	'	'
Inventories	'	0	'	0	'	'
Deferred income taxes	'	0	'	'	'	'
Restricted investments and bond collateral	'	0	'	'	'	'
Other current assets	'	6,144	'	743	'	'
Total current assets	37,933	16,813	'	-1,050	'	'
Property, plant and equipment:	'	'	'	'	'	'
Land and mineral rights	'	0	'	0	'	'
Plant and equipment	'	3,973	'	3,198	'	'
Gross property, plant and equipment	4,000	3,973	'	3,198	'	'
Less accumulated depreciation, depletion and amortization	'	2,707	'	2,364	'	'
Net property, plant and equipment	1,216	1,266	'	834	'	'
Advanced coal royalties	'	0	'	0	'	'
Reclamation deposits	'	0	'	0	'	'
Restricted investments and bond collateral	'	15,134	'	15,183	'	'
Contractual third-party reclamation receivables, less current portion	'	0	'	0	'	'
Intangible assets	'	0	'	0	'	'
Investment in subsidiaries	'	280,843	'	257,773	'	'
Other assets	'	8,636	'	10,267	'	'
Total Assets	776,929	322,692	'	283,007	'	'
Accounts payable and accrued expenses:	'	'	'	'	'	'
Total current liabilities	66,128	51,683	'	28,527	'	'
Shareholders' deficit:	'	'	'	'	'	'
Common stock	'	36,479	'	35,502	'	'
Other paid-in capital	'	134,861	'	130,852	'	'
Accumulated other comprehensive loss	'	-63,595	'	-148,345	'	'
Accumulated earnings (deficit)	'	-295,784	'	-289,727	'	'
Total Westmoreland Coal Company shareholders' deficit	-206,216	-187,879	'	-271,558	'	'
Noncontrolling interest	'	0	'	-14,673	'	'
Total equity (deficit)	'	-187,879	'	-286,231	'	'
Total Liabilities and Shareholders' Deficit	776,929	322,692	'	283,007	'	'
Accounts Payable and Other Accrued Liabilities, Current	'	6,840	'	5,060	'	'
Production Taxes	'	0	'	0	'	'
Workers' Compensation Liability, Current	'	717	'	820	'	'
Postretirement Medical Benefits Current	'	12,042	'	12,494	'	'
Supplemental Executive Retirement Plan Current	'	390	'	390	'	'
Deferred Revenue, Current	'	0	'	0	'	'
Asset Retirement Obligation, Current	'	0	'	0	'	'
Other Sundry Liabilities, Current	'	11,302	'	11,311	'	'
Long-term debt, less current installments	'	224,582	'	245,456	'	'
Workers' Compensation Liability, Noncurrent	'	6,744	'	8,710	'	'
Excess of black lung benefit obligation over trust assets	'	8,675	'	8,356	'	'
Other Postretirement Defined Benefit Plan, Liabilities, Noncurrent	'	185,858	'	224,336	'	'
Defined Benefit Pension Plan, Liabilities, Noncurrent	'	13,069	'	29,265	'	'
Deferred Revenue, Noncurrent	'	0	'	0	'	'
Asset Retirement Obligations, Noncurrent	'	0	'	0	'	'
Intangible Liabilities Non Current	'	0	'	0	'	'
Other Liabilities, Noncurrent	'	5,939	'	701	'	'
Intercompany Payable	'	14,021	'	23,887	'	'
Liabilities	983,145	510,571	'	569,238	'	'
Preferred Stock, Value, Issued	'	160	'	160	'	'
Co-Issuer [Member]	'	'	'	'	'	'
Condensed Financial Statements, Captions [Line Items]	'	'	'	'	'	'
Long-term Debt and Capital Lease Obligations, Current	'	0	'	0	'	'
Current assets:	'	'	'	'	'	'
Cash and cash equivalents	4,043	3,341	4,807	4,545	6	880
Receivables:	'	'	'	'	'	'
Trade	'	12,934	'	13,018	'	'
Contractual third-party reclamation receivables	'	0	'	0	'	'
Intercompany receivable/payable	'	0	'	0	'	'
Other	'	210	'	0	'	'
Total receivables	12,664	13,144	'	13,018	'	'
Inventories	'	6,161	'	3,047	'	'
Deferred income taxes	'	0	'	'	'	'
Restricted investments and bond collateral	'	5,998	'	'	'	'
Other current assets	'	143	'	298	'	'
Total current assets	18,977	28,787	'	20,908	'	'
Property, plant and equipment:	'	'	'	'	'	'
Land and mineral rights	'	1,395	'	1,395	'	'
Plant and equipment	'	220,872	'	219,857	'	'
Gross property, plant and equipment	222,327	222,267	'	221,252	'	'
Less accumulated depreciation, depletion and amortization	'	71,653	'	61,474	'	'
Net property, plant and equipment	148,150	150,614	'	159,778	'	'
Advanced coal royalties	'	0	'	0	'	'
Reclamation deposits	'	0	'	0	'	'
Restricted investments and bond collateral	'	0	'	5,990	'	'
Contractual third-party reclamation receivables, less current portion	'	0	'	0	'	'
Intangible assets	'	1,283	'	2,923	'	'
Investment in subsidiaries	'	0	'	0	'	'
Other assets	'	0	'	0	'	'
Total Assets	167,998	180,684	'	189,599	'	'
Accounts payable and accrued expenses:	'	'	'	'	'	'
Total current liabilities	21,370	24,199	'	13,769	'	'
Shareholders' deficit:	'	'	'	'	'	'
Common stock	'	5	'	5	'	'
Other paid-in capital	'	52,835	'	52,806	'	'
Accumulated other comprehensive loss	'	-164	'	-372	'	'
Accumulated earnings (deficit)	'	55,915	'	65,409	'	'
Total Westmoreland Coal Company shareholders' deficit	101,957	108,591	'	117,848	'	'
Noncontrolling interest	'	0	'	0	'	'
Total equity (deficit)	'	108,591	'	117,848	'	'
Total Liabilities and Shareholders' Deficit	167,998	180,684	'	189,599	'	'
Accounts Payable and Other Accrued Liabilities, Current	'	10,119	'	4,978	'	'
Production Taxes	'	3	'	3	'	'
Workers' Compensation Liability, Current	'	0	'	0	'	'
Postretirement Medical Benefits Current	'	0	'	0	'	'
Supplemental Executive Retirement Plan Current	'	0	'	0	'	'
Deferred Revenue, Current	'	9,024	'	8,788	'	'
Asset Retirement Obligation, Current	'	0	'	0	'	'
Other Sundry Liabilities, Current	'	5,053	'	0	'	'
Long-term debt, less current installments	'	0	'	0	'	'
Workers' Compensation Liability, Noncurrent	'	0	'	0	'	'
Excess of black lung benefit obligation over trust assets	'	0	'	0	'	'
Other Postretirement Defined Benefit Plan, Liabilities, Noncurrent	'	0	'	0	'	'
Defined Benefit Pension Plan, Liabilities, Noncurrent	'	99	'	289	'	'
Deferred Revenue, Noncurrent	'	41,297	'	50,239	'	'
Asset Retirement Obligations, Noncurrent	'	892	'	829	'	'
Intangible Liabilities Non Current	'	5,606	'	6,625	'	'
Other Liabilities, Noncurrent	'	0	'	0	'	'
Intercompany Payable	'	0	'	0	'	'
Liabilities	66,041	72,093	'	71,751	'	'
Preferred Stock, Value, Issued	'	0	'	0	'	'
Guarantor Subsidiaries [Member]	'	'	'	'	'	'
Condensed Financial Statements, Captions [Line Items]	'	'	'	'	'	'
Long-term Debt and Capital Lease Obligations, Current	'	23,951	'	25,339	'	'
Current assets:	'	'	'	'	'	'
Cash and cash equivalents	27,267	27,451	23,132	10,236	3,381	352
Receivables:	'	'	'	'	'	'
Trade	'	46,985	'	43,420	'	'
Contractual third-party reclamation receivables	'	8,487	'	10,207	'	'
Intercompany receivable/payable	'	2,761	'	2,595	'	'
Other	'	3,256	'	17,377	'	'
Total receivables	62,790	61,489	'	73,599	'	'
Inventories	'	33,811	'	34,687	'	'
Deferred income taxes	'	870	'	'	'	'
Restricted investments and bond collateral	'	0	'	'	'	'
Other current assets	'	11,069	'	15,463	'	'
Total current assets	132,382	134,690	'	133,985	'	'
Property, plant and equipment:	'	'	'	'	'	'
Land and mineral rights	'	276,793	'	260,346	'	'
Plant and equipment	'	432,851	'	412,665	'	'
Gross property, plant and equipment	725,060	709,644	'	673,011	'	'
Less accumulated depreciation, depletion and amortization	'	371,488	'	320,783	'	'
Net property, plant and equipment	340,266	338,156	'	352,228	'	'
Advanced coal royalties	'	7,311	'	4,316	'	'
Reclamation deposits	'	74,921	'	72,718	'	'
Restricted investments and bond collateral	'	54,101	'	66,036	'	'
Contractual third-party reclamation receivables, less current portion	'	88,303	'	84,158	'	'
Intangible assets	'	237	'	280	'	'
Investment in subsidiaries	'	0	'	-792	'	'
Other assets	'	1,683	'	2,092	'	'
Total Assets	699,150	699,402	'	715,021	'	'
Accounts payable and accrued expenses:	'	'	'	'	'	'
Total current liabilities	143,735	128,162	'	121,786	'	'
Shareholders' deficit:	'	'	'	'	'	'
Common stock	'	110	'	110	'	'
Other paid-in capital	'	157,984	'	155,585	'	'
Accumulated other comprehensive loss	'	6,425	'	-22,777	'	'
Accumulated earnings (deficit)	'	-3,120	'	-8,550	'	'
Total Westmoreland Coal Company shareholders' deficit	149,601	161,399	'	124,368	'	'
Noncontrolling interest	'	0	'	0	'	'
Total equity (deficit)	'	161,399	'	124,368	'	'
Total Liabilities and Shareholders' Deficit	699,150	699,402	'	715,021	'	'
Accounts Payable and Other Accrued Liabilities, Current	'	38,061	'	40,715	'	'
Production Taxes	'	36,522	'	28,856	'	'
Workers' Compensation Liability, Current	'	0	'	0	'	'
Postretirement Medical Benefits Current	'	774	'	449	'	'
Supplemental Executive Retirement Plan Current	'	0	'	0	'	'
Deferred Revenue, Current	'	5,044	'	4,034	'	'
Asset Retirement Obligation, Current	'	23,353	'	22,238	'	'
Other Sundry Liabilities, Current	'	457	'	155	'	'
Long-term debt, less current installments	'	72,912	'	93,742	'	'
Workers' Compensation Liability, Noncurrent	'	0	'	0	'	'
Excess of black lung benefit obligation over trust assets	'	0	'	0	'	'
Other Postretirement Defined Benefit Plan, Liabilities, Noncurrent	'	66,439	'	74,589	'	'
Defined Benefit Pension Plan, Liabilities, Noncurrent	'	10,765	'	23,955	'	'
Deferred Revenue, Noncurrent	'	5,270	'	6,652	'	'
Asset Retirement Obligations, Noncurrent	'	255,619	'	240,780	'	'
Intangible Liabilities Non Current	'	0	'	0	'	'
Other Liabilities, Noncurrent	'	6,687	'	16,145	'	'
Intercompany Payable	'	-7,851	'	13,004	'	'
Liabilities	549,549	538,003	'	590,653	'	'
Preferred Stock, Value, Issued	'	0	'	0	'	'
Non-Guarantor Subsidiaries [Member]	'	'	'	'	'	'
Condensed Financial Statements, Captions [Line Items]	'	'	'	'	'	'
Long-term Debt and Capital Lease Obligations, Current	'	0	'	0	'	'
Current assets:	'	'	'	'	'	'
Cash and cash equivalents	1,831	4,992	1,942	1,993	1,256	4,272
Receivables:	'	'	'	'	'	'
Trade	'	6,277	'	3,599	'	'
Contractual third-party reclamation receivables	'	0	'	0	'	'
Intercompany receivable/payable	'	-19,353	'	-18,262	'	'
Other	'	28	'	8	'	'
Total receivables	-19,031	-13,048	'	-14,655	'	'
Inventories	'	0	'	0	'	'
Deferred income taxes	'	0	'	'	'	'
Restricted investments and bond collateral	'	0	'	'	'	'
Other current assets	'	834	'	0	'	'
Total current assets	-16,779	-7,222	'	-12,662	'	'
Property, plant and equipment:	'	'	'	'	'	'
Land and mineral rights	'	0	'	0	'	'
Plant and equipment	'	0	'	0	'	'
Gross property, plant and equipment	0	0	'	0	'	'
Less accumulated depreciation, depletion and amortization	'	0	'	0	'	'
Net property, plant and equipment	0	0	'	0	'	'
Advanced coal royalties	'	0	'	0	'	'
Reclamation deposits	'	0	'	0	'	'
Restricted investments and bond collateral	'	0	'	0	'	'
Contractual third-party reclamation receivables, less current portion	'	0	'	0	'	'
Intangible assets	'	0	'	0	'	'
Investment in subsidiaries	'	3,770	'	3,770	'	'
Other assets	'	2,000	'	2,000	'	'
Total Assets	-9,509	-1,452	'	-6,892	'	'
Accounts payable and accrued expenses:	'	'	'	'	'	'
Total current liabilities	4,484	9,006	'	21,675	'	'
Shareholders' deficit:	'	'	'	'	'	'
Common stock	'	132	'	132	'	'
Other paid-in capital	'	-124	'	-124	'	'
Accumulated other comprehensive loss	'	-3,086	'	-6,702	'	'
Accumulated earnings (deficit)	'	-41,337	'	-59,292	'	'
Total Westmoreland Coal Company shareholders' deficit	-47,588	-44,415	'	-65,986	'	'
Noncontrolling interest	'	0	'	0	'	'
Total equity (deficit)	'	-44,415	'	-65,986	'	'
Total Liabilities and Shareholders' Deficit	-9,509	-1,452	'	-6,892	'	'
Accounts Payable and Other Accrued Liabilities, Current	'	2,487	'	16,181	'	'
Production Taxes	'	5,380	'	4,369	'	'
Workers' Compensation Liability, Current	'	0	'	0	'	'
Postretirement Medical Benefits Current	'	1,139	'	1,125	'	'
Supplemental Executive Retirement Plan Current	'	0	'	0	'	'
Deferred Revenue, Current	'	0	'	0	'	'
Asset Retirement Obligation, Current	'	0	'	0	'	'
Other Sundry Liabilities, Current	'	0	'	0	'	'
Long-term debt, less current installments	'	0	'	0	'	'
Workers' Compensation Liability, Noncurrent	'	0	'	0	'	'
Excess of black lung benefit obligation over trust assets	'	0	'	0	'	'
Other Postretirement Defined Benefit Plan, Liabilities, Noncurrent	'	18,077	'	20,850	'	'
Defined Benefit Pension Plan, Liabilities, Noncurrent	'	243	'	741	'	'
Deferred Revenue, Noncurrent	'	0	'	0	'	'
Asset Retirement Obligations, Noncurrent	'	0	'	0	'	'
Intangible Liabilities Non Current	'	0	'	0	'	'
Other Liabilities, Noncurrent	'	983	'	1,174	'	'
Intercompany Payable	'	14,654	'	14,654	'	'
Liabilities	38,079	42,963	'	59,094	'	'
Preferred Stock, Value, Issued	'	0	'	0	'	'
Consolidating Adjustments [Member]	'	'	'	'	'	'
Condensed Financial Statements, Captions [Line Items]	'	'	'	'	'	'
Long-term Debt and Capital Lease Obligations, Current	'	0	'	0	'	'
Current assets:	'	'	'	'	'	'
Cash and cash equivalents	0	0	0	0	0	0
Receivables:	'	'	'	'	'	'
Trade	'	0	'	0	'	'
Contractual third-party reclamation receivables	'	0	'	0	'	'
Intercompany receivable/payable	'	32,865	'	32,976	'	'
Other	'	-24	'	-14,845	'	'
Total receivables	32,679	32,841	'	18,131	'	'
Inventories	'	0	'	0	'	'
Deferred income taxes	'	-870	'	'	'	'
Restricted investments and bond collateral	'	0	'	'	'	'
Other current assets	'	0	'	0	'	'
Total current assets	32,680	31,971	'	18,131	'	'
Property, plant and equipment:	'	'	'	'	'	'
Land and mineral rights	'	0	'	0	'	'
Plant and equipment	'	0	'	0	'	'
Gross property, plant and equipment	0	0	'	0	'	'
Less accumulated depreciation, depletion and amortization	'	0	'	0	'	'
Net property, plant and equipment	1	0	'	0	'	'
Advanced coal royalties	'	0	'	0	'	'
Reclamation deposits	'	0	'	0	'	'
Restricted investments and bond collateral	'	0	'	0	'	'
Contractual third-party reclamation receivables, less current portion	'	0	'	0	'	'
Intangible assets	'	0	'	0	'	'
Investment in subsidiaries	'	-284,613	'	-260,751	'	'
Other assets	'	-1,999	'	-2,000	'	'
Total Assets	-227,421	-254,641	'	-244,620	'	'
Accounts payable and accrued expenses:	'	'	'	'	'	'
Total current liabilities	-31	-22	'	-14,845	'	'
Shareholders' deficit:	'	'	'	'	'	'
Common stock	'	-247	'	-247	'	'
Other paid-in capital	'	-210,695	'	-208,267	'	'
Accumulated other comprehensive loss	'	-3,175	'	29,851	'	'
Accumulated earnings (deficit)	'	-11,458	'	2,433	'	'
Total Westmoreland Coal Company shareholders' deficit	-203,970	-225,575	'	-176,230	'	'
Noncontrolling interest	'	0	'	0	'	'
Total equity (deficit)	'	-225,575	'	-176,230	'	'
Total Liabilities and Shareholders' Deficit	-227,421	-254,641	'	-244,620	'	'
Accounts Payable and Other Accrued Liabilities, Current	'	0	'	-14,841	'	'
Production Taxes	'	0	'	0	'	'
Workers' Compensation Liability, Current	'	0	'	0	'	'
Postretirement Medical Benefits Current	'	0	'	0	'	'
Supplemental Executive Retirement Plan Current	'	0	'	0	'	'
Deferred Revenue, Current	'	0	'	0	'	'
Asset Retirement Obligation, Current	'	0	'	0	'	'
Other Sundry Liabilities, Current	'	-22	'	-4	'	'
Long-term debt, less current installments	'	-2,000	'	-2,000	'	'
Workers' Compensation Liability, Noncurrent	'	0	'	0	'	'
Excess of black lung benefit obligation over trust assets	'	0	'	0	'	'
Other Postretirement Defined Benefit Plan, Liabilities, Noncurrent	'	0	'	0	'	'
Defined Benefit Pension Plan, Liabilities, Noncurrent	'	0	'	0	'	'
Deferred Revenue, Noncurrent	'	0	'	0	'	'
Asset Retirement Obligations, Noncurrent	'	0	'	0	'	'
Intangible Liabilities Non Current	'	0	'	0	'	'
Other Liabilities, Noncurrent	'	-6,220	'	0	'	'
Intercompany Payable	'	-20,824	'	-51,545	'	'
Liabilities	-23,451	-29,066	'	-68,390	'	'
Preferred Stock, Value, Issued	'	0	'	0	'	'
Scenario, Previously Reported [Member]	'	'	'	'	'	'
Condensed Financial Statements, Captions [Line Items]	'	'	'	'	'	'
Long-term Debt and Capital Lease Obligations, Current	48,586	44,343	'	23,791	'	'
Current assets:	'	'	'	'	'	'
Cash and cash equivalents	61,900	61,110	40,852	31,610	30,783	5,775
Receivables:	'	'	'	'	'	'
Trade	64,715	66,196	'	60,037	'	'
Contractual third-party reclamation receivables	8,213	8,487	'	10,207	'	'
Intercompany receivable/payable	0	0	'	0	'	'
Other	1,375	5,086	'	3,220	'	'
Total receivables	74,303	79,769	'	73,464	'	'
Inventories	35,447	39,972	'	37,734	'	'
Deferred income taxes	'	0	'	'	'	'
Restricted investments and bond collateral	16,900	5,998	'	'	'	'
Other current assets	16,643	18,190	'	16,504	'	'
Total current assets	205,193	205,039	'	159,312	'	'
Property, plant and equipment:	'	'	'	'	'	'
Land and mineral rights	278,198	278,188	'	261,741	'	'
Plant and equipment	673,189	657,696	'	635,720	'	'
Gross property, plant and equipment	951,387	935,884	'	897,461	'	'
Less accumulated depreciation, depletion and amortization	461,754	445,848	'	384,621	'	'
Net property, plant and equipment	489,633	490,036	'	512,840	'	'
Advanced coal royalties	7,263	7,311	'	4,316	'	'
Reclamation deposits	75,315	74,921	'	72,718	'	'
Restricted investments and bond collateral	523,483	69,235	'	87,209	'	'
Contractual third-party reclamation receivables, less current portion	88,036	88,303	'	84,158	'	'
Intangible assets	1,099	1,520	'	3,203	'	'
Investment in subsidiaries	0	0	'	0	'	'
Other assets	17,125	10,320	'	12,359	'	'
Total Assets	1,407,147	946,685	'	936,115	'	'
Accounts payable and accrued expenses:	'	'	'	'	'	'
Total current liabilities	235,686	213,028	'	170,912	'	'
Shareholders' deficit:	'	'	'	'	'	'
Common stock	37,155	36,479	'	35,502	'	'
Other paid-in capital	134,952	134,861	'	130,852	'	'
Accumulated other comprehensive loss	-63,369	-63,595	'	-148,345	'	'
Accumulated earnings (deficit)	-315,075	-295,784	'	-289,727	'	'
Total Westmoreland Coal Company shareholders' deficit	-206,216	-187,879	'	-271,558	'	'
Noncontrolling interest	'	0	'	-14,673	'	'
Total equity (deficit)	'	-187,879	'	-286,231	'	'
Total Liabilities and Shareholders' Deficit	1,407,147	946,685	'	936,115	'	'
Accounts Payable and Other Accrued Liabilities, Current	62,598	57,507	'	52,093	'	'
Production Taxes	46,794	41,905	'	33,228	'	'
Workers' Compensation Liability, Current	712	717	'	820	'	'
Postretirement Medical Benefits Current	13,955	13,955	'	14,068	'	'
Supplemental Executive Retirement Plan Current	390	390	'	390	'	'
Deferred Revenue, Current	16,034	14,068	'	12,822	'	'
Asset Retirement Obligation, Current	22,227	23,353	'	22,238	'	'
Other Sundry Liabilities, Current	24,390	16,790	'	11,462	'	'
Long-term debt, less current installments	751,645	295,494	'	337,198	'	'
Workers' Compensation Liability, Noncurrent	6,680	6,744	'	8,710	'	'
Excess of black lung benefit obligation over trust assets	9,376	8,675	'	8,356	'	'
Other Postretirement Defined Benefit Plan, Liabilities, Noncurrent	271,275	270,374	'	319,775	'	'
Defined Benefit Pension Plan, Liabilities, Noncurrent	23,524	24,176	'	54,250	'	'
Deferred Revenue, Noncurrent	43,299	46,567	'	56,891	'	'
Asset Retirement Obligations, Noncurrent	259,036	256,511	'	241,609	'	'
Intangible Liabilities Non Current	5,339	5,606	'	6,625	'	'
Other Liabilities, Noncurrent	7,503	7,389	'	18,020	'	'
Intercompany Payable	0	0	'	0	'	'
Liabilities	1,613,363	1,134,564	'	1,222,346	'	'
Preferred Stock, Value, Issued	121	160	'	160	'	'
Scenario, Previously Reported [Member] | Parent Company [Member]	'	'	'	'	'	'
Condensed Financial Statements, Captions [Line Items]	'	'	'	'	'	'
Long-term Debt and Capital Lease Obligations, Current	22,785	20,392	'	-1,548	'	'
Current assets:	'	'	'	'	'	'
Cash and cash equivalents	28,759	25,326	-9,637	14,836	26,141	271
Receivables:	'	'	'	'	'	'
Trade	0	0	'	0	'	'
Contractual third-party reclamation receivables	0	0	'	0	'	'
Intercompany receivable/payable	-2,263	-3,568	'	-8,002	'	'
Other	273	95	'	77	'	'
Total receivables	-1,990	-3,473	'	-7,925	'	'
Inventories	0	0	'	0	'	'
Deferred income taxes	'	0	'	'	'	'
Restricted investments and bond collateral	16,900	0	'	'	'	'
Other current assets	7,044	6,115	'	739	'	'
Total current assets	50,713	27,968	'	7,650	'	'
Property, plant and equipment:	'	'	'	'	'	'
Land and mineral rights	0	0	'	0	'	'
Plant and equipment	3,966	3,939	'	3,198	'	'
Gross property, plant and equipment	3,966	3,939	'	3,198	'	'
Less accumulated depreciation, depletion and amortization	2,781	2,705	'	2,364	'	'
Net property, plant and equipment	1,185	1,234	'	834	'	'
Advanced coal royalties	0	0	'	0	'	'
Reclamation deposits	0	0	'	0	'	'
Restricted investments and bond collateral	469,385	15,134	'	15,183	'	'
Contractual third-party reclamation receivables, less current portion	0	0	'	0	'	'
Intangible assets	0	0	'	0	'	'
Investment in subsidiaries	237,926	266,847	'	248,565	'	'
Other assets	15,563	8,636	'	10,267	'	'
Total Assets	774,772	319,819	'	282,499	'	'
Accounts payable and accrued expenses:	'	'	'	'	'	'
Total current liabilities	64,125	48,965	'	28,175	'	'
Shareholders' deficit:	'	'	'	'	'	'
Common stock	37,155	36,479	'	35,502	'	'
Other paid-in capital	134,953	134,861	'	130,852	'	'
Accumulated other comprehensive loss	-63,369	-63,595	'	-148,345	'	'
Accumulated earnings (deficit)	-315,075	-295,784	'	-289,727	'	'
Total Westmoreland Coal Company shareholders' deficit	-206,215	-187,879	'	-271,558	'	'
Noncontrolling interest	'	0	'	-14,673	'	'
Total equity (deficit)	'	-187,879	'	-286,231	'	'
Total Liabilities and Shareholders' Deficit	774,772	319,819	'	282,499	'	'
Accounts Payable and Other Accrued Liabilities, Current	9,000	4,122	'	4,707	'	'
Production Taxes	0	0	'	0	'	'
Workers' Compensation Liability, Current	712	717	'	820	'	'
Postretirement Medical Benefits Current	12,042	12,042	'	12,494	'	'
Supplemental Executive Retirement Plan Current	390	390	'	390	'	'
Deferred Revenue, Current	0	0	'	0	'	'
Asset Retirement Obligation, Current	0	0	'	0	'	'
Other Sundry Liabilities, Current	19,196	11,302	'	11,312	'	'
Long-term debt, less current installments	677,385	224,582	'	245,456	'	'
Workers' Compensation Liability, Noncurrent	6,680	6,744	'	8,710	'	'
Excess of black lung benefit obligation over trust assets	9,376	8,675	'	8,356	'	'
Other Postretirement Defined Benefit Plan, Liabilities, Noncurrent	185,447	185,858	'	224,336	'	'
Defined Benefit Pension Plan, Liabilities, Noncurrent	12,921	13,069	'	29,265	'	'
Deferred Revenue, Noncurrent	0	0	'	0	'	'
Asset Retirement Obligations, Noncurrent	0	0	'	0	'	'
Intangible Liabilities Non Current	0	0	'	0	'	'
Other Liabilities, Noncurrent	6,440	5,939	'	701	'	'
Intercompany Payable	18,613	13,866	'	23,731	'	'
Liabilities	980,987	507,698	'	568,730	'	'
Preferred Stock, Value, Issued	121	160	'	160	'	'
Scenario, Previously Reported [Member] | Co-Issuer [Member]	'	'	'	'	'	'
Condensed Financial Statements, Captions [Line Items]	'	'	'	'	'	'
Long-term Debt and Capital Lease Obligations, Current	0	0	'	0	'	'
Current assets:	'	'	'	'	'	'
Cash and cash equivalents	4,043	3,341	4,807	4,545	6	880
Receivables:	'	'	'	'	'	'
Trade	12,456	12,934	'	13,018	'	'
Contractual third-party reclamation receivables	0	0	'	0	'	'
Intercompany receivable/payable	0	0	'	0	'	'
Other	208	210	'	0	'	'
Total receivables	12,664	13,144	'	13,018	'	'
Inventories	1,845	6,161	'	3,047	'	'
Deferred income taxes	'	0	'	'	'	'
Restricted investments and bond collateral	0	5,998	'	'	'	'
Other current assets	425	143	'	298	'	'
Total current assets	18,977	28,787	'	20,908	'	'
Property, plant and equipment:	'	'	'	'	'	'
Land and mineral rights	1,395	1,395	'	1,395	'	'
Plant and equipment	220,932	220,872	'	219,857	'	'
Gross property, plant and equipment	222,327	222,267	'	221,252	'	'
Less accumulated depreciation, depletion and amortization	74,177	71,653	'	61,474	'	'
Net property, plant and equipment	148,150	150,614	'	159,778	'	'
Advanced coal royalties	0	0	'	0	'	'
Reclamation deposits	0	0	'	0	'	'
Restricted investments and bond collateral	0	0	'	5,990	'	'
Contractual third-party reclamation receivables, less current portion	0	0	'	0	'	'
Intangible assets	871	1,283	'	2,923	'	'
Investment in subsidiaries	0	0	'	0	'	'
Other assets	0	0	'	0	'	'
Total Assets	167,998	180,684	'	189,599	'	'
Accounts payable and accrued expenses:	'	'	'	'	'	'
Total current liabilities	21,370	24,199	'	13,769	'	'
Shareholders' deficit:	'	'	'	'	'	'
Common stock	5	5	'	5	'	'
Other paid-in capital	52,842	52,835	'	52,807	'	'
Accumulated other comprehensive loss	-162	-164	'	-372	'	'
Accumulated earnings (deficit)	49,272	55,915	'	65,408	'	'
Total Westmoreland Coal Company shareholders' deficit	101,957	108,591	'	117,848	'	'
Noncontrolling interest	'	0	'	0	'	'
Total equity (deficit)	'	108,591	'	117,848	'	'
Total Liabilities and Shareholders' Deficit	167,998	180,684	'	189,599	'	'
Accounts Payable and Other Accrued Liabilities, Current	6,331	10,119	'	4,978	'	'
Production Taxes	405	3	'	3	'	'
Workers' Compensation Liability, Current	0	0	'	0	'	'
Postretirement Medical Benefits Current	0	0	'	0	'	'
Supplemental Executive Retirement Plan Current	0	0	'	0	'	'
Deferred Revenue, Current	9,581	9,024	'	8,788	'	'
Asset Retirement Obligation, Current	0	0	'	0	'	'
Other Sundry Liabilities, Current	5,053	5,053	'	0	'	'
Long-term debt, less current installments	0	0	'	0	'	'
Workers' Compensation Liability, Noncurrent	0	0	'	0	'	'
Excess of black lung benefit obligation over trust assets	0	0	'	0	'	'
Other Postretirement Defined Benefit Plan, Liabilities, Noncurrent	0	0	'	0	'	'
Defined Benefit Pension Plan, Liabilities, Noncurrent	98	99	'	289	'	'
Deferred Revenue, Noncurrent	38,325	41,297	'	50,239	'	'
Asset Retirement Obligations, Noncurrent	909	892	'	829	'	'
Intangible Liabilities Non Current	5,339	5,606	'	6,625	'	'
Other Liabilities, Noncurrent	0	0	'	0	'	'
Intercompany Payable	0	0	'	0	'	'
Liabilities	66,041	72,093	'	71,751	'	'
Preferred Stock, Value, Issued	0	0	'	0	'	'
Scenario, Previously Reported [Member] | Guarantor Subsidiaries [Member]	'	'	'	'	'	'
Condensed Financial Statements, Captions [Line Items]	'	'	'	'	'	'
Long-term Debt and Capital Lease Obligations, Current	4,596	2,790	'	1,939	'	'
Current assets:	'	'	'	'	'	'
Cash and cash equivalents	8,794	7,942	6,698	5,362	143	0
Receivables:	'	'	'	'	'	'
Trade	22,857	17,389	'	13,428	'	'
Contractual third-party reclamation receivables	44	44	'	56	'	'
Intercompany receivable/payable	3,499	4,384	'	5,667	'	'
Other	244	2,974	'	16,806	'	'
Total receivables	26,644	24,791	'	35,957	'	'
Inventories	15,133	16,077	'	16,538	'	'
Deferred income taxes	'	870	'	'	'	'
Restricted investments and bond collateral	0	0	'	'	'	'
Other current assets	3,168	6,883	'	5,550	'	'
Total current assets	53,739	56,563	'	63,407	'	'
Property, plant and equipment:	'	'	'	'	'	'
Land and mineral rights	104,640	104,631	'	91,741	'	'
Plant and equipment	245,368	229,998	'	215,751	'	'
Gross property, plant and equipment	350,008	334,629	'	307,492	'	'
Less accumulated depreciation, depletion and amortization	138,718	132,189	'	108,151	'	'
Net property, plant and equipment	211,290	202,440	'	199,341	'	'
Advanced coal royalties	3,000	3,000	'	500	'	'
Reclamation deposits	0	0	'	0	'	'
Restricted investments and bond collateral	36,615	36,619	'	39,208	'	'
Contractual third-party reclamation receivables, less current portion	302	293	'	327	'	'
Intangible assets	0	0	'	0	'	'
Investment in subsidiaries	0	0	'	-792	'	'
Other assets	569	586	'	635	'	'
Total Assets	305,515	299,501	'	302,626	'	'
Accounts payable and accrued expenses:	'	'	'	'	'	'
Total current liabilities	50,444	40,460	'	33,729	'	'
Shareholders' deficit:	'	'	'	'	'	'
Common stock	110	110	'	110	'	'
Other paid-in capital	92,896	94,370	'	93,456	'	'
Accumulated other comprehensive loss	17,372	17,492	'	-4,987	'	'
Accumulated earnings (deficit)	24,841	28,389	'	54,750	'	'
Total Westmoreland Coal Company shareholders' deficit	135,219	140,361	'	143,329	'	'
Noncontrolling interest	'	0	'	0	'	'
Total equity (deficit)	'	140,361	'	143,329	'	'
Total Liabilities and Shareholders' Deficit	305,515	299,501	'	302,626	'	'
Accounts Payable and Other Accrued Liabilities, Current	14,710	12,522	'	15,163	'	'
Production Taxes	22,442	17,429	'	10,014	'	'
Workers' Compensation Liability, Current	0	0	'	0	'	'
Postretirement Medical Benefits Current	329	329	'	87	'	'
Supplemental Executive Retirement Plan Current	0	0	'	0	'	'
Deferred Revenue, Current	4,813	3,969	'	2,997	'	'
Asset Retirement Obligation, Current	3,554	3,104	'	3,519	'	'
Other Sundry Liabilities, Current	0	317	'	10	'	'
Long-term debt, less current installments	12,912	2,664	'	2,473	'	'
Workers' Compensation Liability, Noncurrent	0	0	'	0	'	'
Excess of black lung benefit obligation over trust assets	0	0	'	0	'	'
Other Postretirement Defined Benefit Plan, Liabilities, Noncurrent	50,472	49,418	'	55,981	'	'
Defined Benefit Pension Plan, Liabilities, Noncurrent	9,494	9,381	'	19,346	'	'
Deferred Revenue, Noncurrent	0	0	'	0	'	'
Asset Retirement Obligations, Noncurrent	51,300	50,472	'	40,063	'	'
Intangible Liabilities Non Current	0	0	'	0	'	'
Other Liabilities, Noncurrent	0	6,220	'	15,677	'	'
Intercompany Payable	-4,326	525	'	-7,972	'	'
Liabilities	170,296	159,140	'	159,297	'	'
Preferred Stock, Value, Issued	0	0	'	0	'	'
Scenario, Previously Reported [Member] | Non-Guarantor Subsidiaries [Member]	'	'	'	'	'	'
Condensed Financial Statements, Captions [Line Items]	'	'	'	'	'	'
Long-term Debt and Capital Lease Obligations, Current	21,205	21,161	'	23,400	'	'
Current assets:	'	'	'	'	'	'
Cash and cash equivalents	20,304	24,501	18,376	6,867	4,493	4,624
Receivables:	'	'	'	'	'	'
Trade	29,402	35,873	'	33,591	'	'
Contractual third-party reclamation receivables	8,169	8,443	'	10,151	'	'
Intercompany receivable/payable	-33,946	-33,681	'	-30,641	'	'
Other	681	1,831	'	1,182	'	'
Total receivables	4,306	12,466	'	14,283	'	'
Inventories	18,469	17,735	'	18,149	'	'
Deferred income taxes	'	0	'	'	'	'
Restricted investments and bond collateral	0	0	'	'	'	'
Other current assets	6,005	5,049	'	9,917	'	'
Total current assets	49,084	59,751	'	49,216	'	'
Property, plant and equipment:	'	'	'	'	'	'
Land and mineral rights	172,163	172,163	'	168,605	'	'
Plant and equipment	202,923	202,886	'	196,914	'	'
Gross property, plant and equipment	375,086	375,049	'	365,519	'	'
Less accumulated depreciation, depletion and amortization	246,079	239,302	'	212,632	'	'
Net property, plant and equipment	129,007	135,747	'	152,887	'	'
Advanced coal royalties	4,263	4,311	'	3,816	'	'
Reclamation deposits	75,315	74,921	'	72,718	'	'
Restricted investments and bond collateral	17,483	17,482	'	26,828	'	'
Contractual third-party reclamation receivables, less current portion	87,734	88,010	'	83,831	'	'
Intangible assets	228	238	'	280	'	'
Investment in subsidiaries	3,770	3,770	'	3,770	'	'
Other assets	4,493	3,098	'	3,457	'	'
Total Assets	371,377	387,328	'	396,803	'	'
Accounts payable and accrued expenses:	'	'	'	'	'	'
Total current liabilities	99,777	99,426	'	110,083	'	'
Shareholders' deficit:	'	'	'	'	'	'
Common stock	132	132	'	132	'	'
Other paid-in capital	66,027	64,401	'	62,539	'	'
Accumulated other comprehensive loss	-13,937	-14,153	'	-24,492	'	'
Accumulated earnings (deficit)	-100,334	-87,753	'	-132,334	'	'
Total Westmoreland Coal Company shareholders' deficit	-48,112	-37,373	'	-94,155	'	'
Noncontrolling interest	'	0	'	0	'	'
Total equity (deficit)	'	-37,373	'	-94,155	'	'
Total Liabilities and Shareholders' Deficit	371,377	387,328	'	396,803	'	'
Accounts Payable and Other Accrued Liabilities, Current	32,557	30,743	'	42,085	'	'
Production Taxes	23,947	24,472	'	23,211	'	'
Workers' Compensation Liability, Current	0	0	'	0	'	'
Postretirement Medical Benefits Current	1,583	1,583	'	1,487	'	'
Supplemental Executive Retirement Plan Current	0	0	'	0	'	'
Deferred Revenue, Current	1,640	1,075	'	1,037	'	'
Asset Retirement Obligation, Current	18,673	20,250	'	18,719	'	'
Other Sundry Liabilities, Current	172	142	'	144	'	'
Long-term debt, less current installments	64,848	70,248	'	91,269	'	'
Workers' Compensation Liability, Noncurrent	0	0	'	0	'	'
Excess of black lung benefit obligation over trust assets	0	0	'	0	'	'
Other Postretirement Defined Benefit Plan, Liabilities, Noncurrent	35,356	35,098	'	39,458	'	'
Defined Benefit Pension Plan, Liabilities, Noncurrent	1,011	1,627	'	5,350	'	'
Deferred Revenue, Noncurrent	4,974	5,271	'	6,652	'	'
Asset Retirement Obligations, Noncurrent	206,827	205,147	'	200,717	'	'
Intangible Liabilities Non Current	0	0	'	0	'	'
Other Liabilities, Noncurrent	1,063	1,450	'	1,642	'	'
Intercompany Payable	5,633	6,434	'	35,787	'	'
Liabilities	419,489	424,701	'	490,958	'	'
Preferred Stock, Value, Issued	0	0	'	0	'	'
Scenario, Previously Reported [Member] | Consolidating Adjustments [Member]	'	'	'	'	'	'
Condensed Financial Statements, Captions [Line Items]	'	'	'	'	'	'
Long-term Debt and Capital Lease Obligations, Current	0	0	'	0	'	'
Current assets:	'	'	'	'	'	'
Cash and cash equivalents	0	0	20,608	0	0	0
Receivables:	'	'	'	'	'	'
Trade	0	0	'	0	'	'
Contractual third-party reclamation receivables	0	0	'	0	'	'
Intercompany receivable/payable	32,710	32,865	'	32,976	'	'
Other	-31	-24	'	-14,845	'	'
Total receivables	32,679	32,841	'	18,131	'	'
Inventories	0	-1	'	0	'	'
Deferred income taxes	'	-870	'	'	'	'
Restricted investments and bond collateral	0	0	'	'	'	'
Other current assets	1	0	'	0	'	'
Total current assets	32,680	31,970	'	18,131	'	'
Property, plant and equipment:	'	'	'	'	'	'
Land and mineral rights	0	-1	'	0	'	'
Plant and equipment	0	1	'	0	'	'
Gross property, plant and equipment	0	0	'	0	'	'
Less accumulated depreciation, depletion and amortization	-1	-1	'	0	'	'
Net property, plant and equipment	1	1	'	0	'	'
Advanced coal royalties	0	0	'	0	'	'
Reclamation deposits	0	0	'	0	'	'
Restricted investments and bond collateral	0	0	'	0	'	'
Contractual third-party reclamation receivables, less current portion	0	0	'	0	'	'
Intangible assets	0	-1	'	0	'	'
Investment in subsidiaries	-241,696	-270,617	'	-251,543	'	'
Other assets	-3,500	-2,000	'	-2,000	'	'
Total Assets	-212,515	-240,647	'	-235,412	'	'
Accounts payable and accrued expenses:	'	'	'	'	'	'
Total current liabilities	-30	-22	'	-14,844	'	'
Shareholders' deficit:	'	'	'	'	'	'
Common stock	-247	-247	'	-247	'	'
Other paid-in capital	-211,766	-211,606	'	-208,802	'	'
Accumulated other comprehensive loss	-3,273	-3,175	'	29,851	'	'
Accumulated earnings (deficit)	26,221	3,449	'	12,176	'	'
Total Westmoreland Coal Company shareholders' deficit	-189,065	-211,579	'	-167,022	'	'
Noncontrolling interest	'	0	'	0	'	'
Total equity (deficit)	'	-211,579	'	-167,022	'	'
Total Liabilities and Shareholders' Deficit	-212,515	-240,647	'	-235,412	'	'
Accounts Payable and Other Accrued Liabilities, Current	0	1	'	-14,840	'	'
Production Taxes	0	1	'	0	'	'
Workers' Compensation Liability, Current	0	0	'	0	'	'
Postretirement Medical Benefits Current	1	1	'	0	'	'
Supplemental Executive Retirement Plan Current	0	0	'	0	'	'
Deferred Revenue, Current	0	0	'	0	'	'
Asset Retirement Obligation, Current	0	-1	'	0	'	'
Other Sundry Liabilities, Current	-31	-24	'	-4	'	'
Long-term debt, less current installments	-3,500	-2,000	'	-2,000	'	'
Workers' Compensation Liability, Noncurrent	0	0	'	0	'	'
Excess of black lung benefit obligation over trust assets	0	0	'	0	'	'
Other Postretirement Defined Benefit Plan, Liabilities, Noncurrent	0	0	'	0	'	'
Defined Benefit Pension Plan, Liabilities, Noncurrent	0	0	'	0	'	'
Deferred Revenue, Noncurrent	0	-1	'	0	'	'
Asset Retirement Obligations, Noncurrent	0	0	'	0	'	'
Intangible Liabilities Non Current	0	0	'	0	'	'
Other Liabilities, Noncurrent	0	-6,220	'	0	'	'
Intercompany Payable	-19,920	-20,825	'	-51,546	'	'
Liabilities	-23,450	-29,068	'	-68,390	'	'
Preferred Stock, Value, Issued	$0	$0	'	$0	'	'

SUPPLEMENTAL_CONSOLIDATING_FIN3

SUPPLEMENTAL CONSOLIDATING FINANCIAL INFORMATION - Supplemental Consolidating Statement of Operations Information (Detail) (USD $)

3 Months Ended

12 Months Ended

In Thousands, unless otherwise specified

Mar. 31, 2014

Dec. 31, 2013

Sep. 30, 2013

Jun. 30, 2013

Mar. 31, 2013

Dec. 31, 2012

Sep. 30, 2012

Jun. 30, 2012

Mar. 31, 2012

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2011

Condensed Financial Statements, Captions [Line Items]

'

'

'

'

'

'

'

'

'

'

'

'

Revenues

$180,202

$173,947

$176,792

$162,499

$161,448

$159,027

$161,332

$132,842

$147,236

$674,686

$600,437

$501,713

Costs, expenses and other:

'

'

'

'

'

'

'

'

'

'

'

'

Cost of sales

138,630

'

'

'

130,421

'

'

'

'

535,320

466,521

392,787

Depreciation, depletion and amortization

16,059

'

'

'

14,426

'

'

'

'

67,231

57,145

45,594

Selling and administrative

13,331

'

'

'

11,887

'

'

'

'

50,721

49,908

40,276

Heritage health benefit expenses

3,544

'

'

'

3,951

'

'

'

'

13,418

13,388

18,575

Loss (gain) on sales of assets

38

'

'

'

-234

'

'

'

'

-74

528

640

Restructuring charges

397

'

'

'

0

'

'

'

'

5,078

0

0

Other operating income

150

'

'

'

-4,737

'

'

'

'

-22,370

-15,925

-6,785

Total costs, expenses and other

172,149

'

'

'

155,714

'

'

'

'

649,324

571,565

491,087

Operating income (loss)

8,053

-883

8,536

11,975

5,734

8,597

15,451

-4,262

9,086

25,362

28,872

10,626

Other income (expense):

'

'

'

'

'

'

'

'

'

'

'

'

Interest expense

-20,798

'

'

'

-10,160

'

'

'

'

-39,937

-42,677

-29,769

Loss on extinguishment of debt

'

'

'

'

'

'

'

'

'

-64

-1,986

-17,030

Interest income

302

'

'

'

297

'

'

'

'

1,366

1,496

1,444

Loss on foreign exchange

-6,790

'

'

'

0

'

'

'

'

'

'

'

Other income (loss)

93

'

'

'

70

'

'

'

'

364

723

-2,572

Total other income (expense)

-27,193

'

'

'

-9,793

'

'

'

'

-38,271

-42,444

-47,927

Income (loss) before income taxes and income of consolidated subsidiaries

-19,140

'

'

'

-4,059

'

'

'

'

-12,909

-13,572

-37,301

Equity in income of subsidiaries

0

'

'

'

0

'

'

'

'

0

0

0

Loss before income taxes

-19,140

'

'

'

-4,059

'

'

'

'

-12,909

-13,572

-37,301

Income tax expense (benefit)

-110

'

'

'

28

'

'

'

'

-4,782

90

-426

Less net loss attributable to noncontrolling interest

0

'

'

'

-1,702

'

'

'

'

-3,430

-6,436

-3,775

Net income (loss) attributable to the Parent company

-19,030

'

'

'

-2,385

'

'

'

'

-4,697

-7,226

-33,100

Net loss

-19,030

'

'

'

-4,087

'

'

'

'

-8,127

-13,662

-36,875

Parent Company [Member]

'

'

'

'

'

'

'

'

'

'

'

'

Condensed Financial Statements, Captions [Line Items]

'

'

'

'

'

'

'

'

'

'

'

'

Revenues

'

'

'

'

'

'

'

'

'

0

0

0

Costs, expenses and other:

'

'

'

'

'

'

'

'

'

'

'

'

Cost of sales

'

'

'

'

'

'

'

'

'

-1,525

-587

-158

Depreciation, depletion and amortization

'

'

'

'

'

'

'

'

'

357

421

306

Selling and administrative

'

'

'

'

'

'

'

'

'

19,027

18,407

13,394

Heritage health benefit expenses

'

'

'

'

'

'

'

'

'

12,361

12,406

17,754

Loss (gain) on sales of assets

'

'

'

'

'

'

'

'

'

0

13

3

Restructuring charges

'

'

'

'

'

'

'

'

'

0

'

'

Other operating income

'

'

'

'

'

'

'

'

'

0

0

0

Total costs, expenses and other

8,144

'

'

'

7,334

'

'

'

'

30,220

30,660

31,299

Operating income (loss)

-8,144

'

'

'

'

'

'

'

'

-30,220

-30,660

-31,299

Other income (expense):

'

'

'

'

'

'

'

'

'

'

'

'

Interest expense

'

'

'

'

'

'

'

'

'

-30,417

-31,301

-16,365

Loss on extinguishment of debt

'

'

'

'

'

'

'

'

'

-64

-1,986

-7,873

Interest income

'

'

'

'

'

'

'

'

'

165

253

266

Other income (loss)

'

'

'

'

'

'

'

'

'

0

190

-3,014

Total other income (expense)

-25,339

'

'

'

-7,554

'

'

'

'

-30,316

-32,844

-26,986

Income (loss) before income taxes and income of consolidated subsidiaries

'

'

'

'

'

'

'

'

'

-60,536

-63,504

-58,285

Equity in income of subsidiaries

'

'

'

'

'

'

'

'

'

47,514

49,834

21,128

Loss before income taxes

-19,168

'

'

'

-4,087

'

'

'

'

-13,022

-13,670

-37,157

Income tax expense (benefit)

'

'

'

'

'

'

'

'

'

-4,895

-8

-282

Less net loss attributable to noncontrolling interest

'

'

'

'

'

'

'

'

'

-3,430

-6,436

-3,775

Net income (loss) attributable to the Parent company

-19,030

'

'

'

-2,385

'

'

'

'

-4,697

-7,226

-33,100

Net loss

-19,030

'

'

'

-4,087

'

'

'

'

-8,127

-13,662

-36,875

Co-Issuer [Member]

'

'

'

'

'

'

'

'

'

'

'

'

Condensed Financial Statements, Captions [Line Items]

'

'

'

'

'

'

'

'

'

'

'

'

Revenues

'

'

'

'

'

'

'

'

'

87,567

81,285

86,785

Costs, expenses and other:

'

'

'

'

'

'

'

'

'

'

'

'

Cost of sales

'

'

'

'

'

'

'

'

'

63,794

59,299

60,243

Depreciation, depletion and amortization

'

'

'

'

'

'

'

'

'

10,178

10,085

10,175

Selling and administrative

'

'

'

'

'

'

'

'

'

3,609

3,657

4,059

Heritage health benefit expenses

'

'

'

'

'

'

'

'

'

0

0

0

Loss (gain) on sales of assets

'

'

'

'

'

'

'

'

'

0

0

189

Restructuring charges

'

'

'

'

'

'

'

'

'

5,078

'

'

Other operating income

'

'

'

'

'

'

'

'

'

0

0

0

Total costs, expenses and other

20,269

'

'

'

20,340

'

'

'

'

82,659

73,041

74,666

Operating income (loss)

1,743

'

'

'

'

'

'

'

'

4,908

8,244

12,119

Other income (expense):

'

'

'

'

'

'

'

'

'

'

'

'

Interest expense

'

'

'

'

'

'

'

'

'

-39

-39

-469

Loss on extinguishment of debt

'

'

'

'

'

'

'

'

'

0

0

-9,073

Interest income

'

'

'

'

'

'

'

'

'

26

15

14

Other income (loss)

'

'

'

'

'

'

'

'

'

0

0

0

Total other income (expense)

-40

'

'

'

0

'

'

'

'

-13

-24

-9,528

Income (loss) before income taxes and income of consolidated subsidiaries

'

'

'

'

'

'

'

'

'

4,895

8,220

2,591

Equity in income of subsidiaries

'

'

'

'

'

'

'

'

'

0

0

0

Loss before income taxes

1,703

'

'

'

-1,004

'

'

'

'

4,895

8,220

2,591

Income tax expense (benefit)

'

'

'

'

'

'

'

'

'

680

107

-2,498

Less net loss attributable to noncontrolling interest

'

'

'

'

'

'

'

'

'

0

0

0

Net income (loss) attributable to the Parent company

1,703

'

'

'

-1,004

'

'

'

'

4,215

8,113

5,089

Net loss

1,703

'

'

'

-1,004

'

'

'

'

4,215

8,113

5,089

Guarantor Subsidiaries [Member]

'

'

'

'

'

'

'

'

'

'

'

'

Condensed Financial Statements, Captions [Line Items]

'

'

'

'

'

'

'

'

'

'

'

'

Revenues

'

'

'

'

'

'

'

'

'

571,021

511,570

390,621

Costs, expenses and other:

'

'

'

'

'

'

'

'

'

'

'

'

Cost of sales

'

'

'

'

'

'

'

'

'

453,508

393,793

304,652

Depreciation, depletion and amortization

'

'

'

'

'

'

'

'

'

56,696

46,639

35,113

Selling and administrative

'

'

'

'

'

'

'

'

'

30,596

29,334

23,850

Heritage health benefit expenses

'

'

'

'

'

'

'

'

'

0

-1

0

Loss (gain) on sales of assets

'

'

'

'

'

'

'

'

'

-74

515

448

Restructuring charges

'

'

'

'

'

'

'

'

'

0

'

'

Other operating income

'

'

'

'

'

'

'

'

'

-22,370

-17,452

-7,258

Total costs, expenses and other

143,853

'

'

'

124,055

'

'

'

'

518,356

452,828

356,805

Operating income (loss)

14,344

'

'

'

'

'

'

'

'

52,665

58,742

33,816

Other income (expense):

'

'

'

'

'

'

'

'

'

'

'

'

Interest expense

'

'

'

'

'

'

'

'

'

-9,495

-11,349

-12,957

Loss on extinguishment of debt

'

'

'

'

'

'

'

'

'

0

0

-84

Interest income

'

'

'

'

'

'

'

'

'

1,190

1,289

1,229

Other income (loss)

'

'

'

'

'

'

'

'

'

364

533

418

Total other income (expense)

-1,820

'

'

'

-2,238

'

'

'

'

-7,941

-9,527

-11,394

Income (loss) before income taxes and income of consolidated subsidiaries

'

'

'

'

'

'

'

'

'

44,724

49,215

22,422

Equity in income of subsidiaries

'

'

'

'

'

'

'

'

'

0

0

0

Loss before income taxes

12,524

'

'

'

13,445

'

'

'

'

44,724

49,215

22,422

Income tax expense (benefit)

'

'

'

'

'

'

'

'

'

8,414

4,410

7,236

Less net loss attributable to noncontrolling interest

'

'

'

'

'

'

'

'

'

0

0

0

Net income (loss) attributable to the Parent company

7,409

'

'

'

10,126

'

'

'

'

36,310

44,805

15,186

Net loss

7,409

'

'

'

10,126

'

'

'

'

36,310

44,805

15,186

Non-Guarantor Subsidiaries [Member]

'

'

'

'

'

'

'

'

'

'

'

'

Condensed Financial Statements, Captions [Line Items]

'

'

'

'

'

'

'

'

'

'

'

'

Revenues

'

'

'

'

'

'

'

'

'

57,545

39,041

79,831

Costs, expenses and other:

'

'

'

'

'

'

'

'

'

'

'

'

Cost of sales

'

'

'

'

'

'

'

'

'

60,990

45,475

83,574

Depreciation, depletion and amortization

'

'

'

'

'

'

'

'

'

0

0

0

Selling and administrative

'

'

'

'

'

'

'

'

'

-2,511

37

-554

Heritage health benefit expenses

'

'

'

'

'

'

'

'

'

1,057

983

821

Loss (gain) on sales of assets

'

'

'

'

'

'

'

'

'

0

0

0

Restructuring charges

'

'

'

'

'

'

'

'

'

0

'

'

Other operating income

'

'

'

'

'

'

'

'

'

0

0

0

Total costs, expenses and other

-117

'

'

'

12,961

'

'

'

'

59,536

46,495

83,841

Operating income (loss)

110

'

'

'

'

'

'

'

'

-1,991

-7,454

-4,010

Other income (expense):

'

'

'

'

'

'

'

'

'

'

'

'

Interest expense

'

'

'

'

'

'

'

'

'

-21

-68

-70

Loss on extinguishment of debt

'

'

'

'

'

'

'

'

'

0

0

0

Interest income

'

'

'

'

'

'

'

'

'

20

19

27

Other income (loss)

'

'

'

'

'

'

'

'

'

0

0

24

Total other income (expense)

6

'

'

'

-1

'

'

'

'

-1

-49

-19

Income (loss) before income taxes and income of consolidated subsidiaries

'

'

'

'

'

'

'

'

'

-1,992

-7,503

-4,029

Equity in income of subsidiaries

'

'

'

'

'

'

'

'

'

0

0

0

Loss before income taxes

116

'

'

'

-1,612

'

'

'

'

-1,992

-7,503

-4,029

Income tax expense (benefit)

'

'

'

'

'

'

'

'

'

0

0

0

Less net loss attributable to noncontrolling interest

'

'

'

'

'

'

'

'

'

0

0

0

Net income (loss) attributable to the Parent company

116

'

'

'

-1,612

'

'

'

'

-1,992

-7,503

-4,029

Net loss

116

'

'

'

-1,612

'

'

'

'

-1,992

-7,503

-4,029

Consolidating Adjustments [Member]

'

'

'

'

'

'

'

'

'

'

'

'

Condensed Financial Statements, Captions [Line Items]

'

'

'

'

'

'

'

'

'

'

'

'

Revenues

'

'

'

'

'

'

'

'

'

-41,447

-31,459

-55,524

Costs, expenses and other:

'

'

'

'

'

'

'

'

'

'

'

'

Cost of sales

'

'

'

'

'

'

'

'

'

-41,447

-31,459

-55,524

Depreciation, depletion and amortization

'

'

'

'

'

'

'

'

'

0

0

0

Selling and administrative

'

'

'

'

'

'

'

'

'

0

-1,527

-473

Heritage health benefit expenses

'

'

'

'

'

'

'

'

'

0

0

0

Loss (gain) on sales of assets

'

'

'

'

'

'

'

'

'

0

0

0

Restructuring charges

'

'

'

'

'

'

'

'

'

0

'

'

Other operating income

'

'

'

'

'

'

'

'

'

0

1,527

473

Total costs, expenses and other

0

'

'

'

-8,976

'

'

'

'

-41,447

-31,459

-55,524

Operating income (loss)

0

'

'

'

'

'

'

'

'

0

0

0

Other income (expense):

'

'

'

'

'

'

'

'

'

'

'

'

Interest expense

'

'

'

'

'

'

'

'

'

35

80

92

Loss on extinguishment of debt

'

'

'

'

'

'

'

'

'

0

0

0

Interest income

'

'

'

'

'

'

'

'

'

-35

-80

-92

Other income (loss)

'

'

'

'

'

'

'

'

'

0

0

0

Total other income (expense)

0

'

'

'

0

'

'

'

'

0

0

0

Income (loss) before income taxes and income of consolidated subsidiaries

'

'

'

'

'

'

'

'

'

0

0

0

Equity in income of subsidiaries

'

'

'

'

'

'

'

'

'

-47,514

-49,834

-21,128

Loss before income taxes

-14,315

'

'

'

-10,801

'

'

'

'

-47,514

-49,834

-21,128

Income tax expense (benefit)

'

'

'

'

'

'

'

'

'

-8,981

-4,419

-4,882

Less net loss attributable to noncontrolling interest

'

'

'

'

'

'

'

'

'

0

0

0

Net income (loss) attributable to the Parent company

-9,228

'

'

'

-7,510

'

'

'

'

-38,533

-45,415

-16,246

Net loss

-9,228

'

'

'

-7,510

'

'

'

'

-38,533

-45,415

-16,246

Scenario, Previously Reported [Member]

'

'

'

'

'

'

'

'

'

'

'

'

Condensed Financial Statements, Captions [Line Items]

'

'

'

'

'

'

'

'

'

'

'

'

Revenues

180,202

'

'

'

161,448

'

'

'

'

674,686

600,437

501,713

Costs, expenses and other:

'

'

'

'

'

'

'

'

'

'

'

'

Cost of sales

138,630

'

'

'

130,421

'

'

'

'

535,320

466,521

392,787

Depreciation, depletion and amortization

16,059

'

'

'

14,426

'

'

'

'

67,231

57,145

45,594

Selling and administrative

13,331

'

'

'

11,887

'

'

'

'

50,721

49,908

40,276

Heritage health benefit expenses

3,544

'

'

'

3,951

'

'

'

'

13,418

13,388

18,575

Loss (gain) on sales of assets

38

'

'

'

-234

'

'

'

'

-74

528

640

Restructuring charges

397

'

'

'

'

'

'

'

'

5,078

'

'

Other operating income

150

'

'

'

-4,737

'

'

'

'

-22,370

-15,925

-6,785

Total costs, expenses and other

172,149

'

'

'

155,714

'

'

'

'

649,324

571,565

491,087

Operating income (loss)

8,053

'

'

'

5,734

'

'

'

'

25,362

28,872

10,626

Other income (expense):

'

'

'

'

'

'

'

'

'

'

'

'

Interest expense

-20,798

'

'

'

-10,160

'

'

'

'

-39,937

-42,677

-29,769

Loss on extinguishment of debt

'

'

'

'

'

'

'

'

'

-64

-1,986

-17,030

Interest income

302

'

'

'

297

'

'

'

'

1,366

1,496

1,444

Loss on foreign exchange

-6,790

'

'

'

'

'

'

'

'

'

'

'

Other income (loss)

93

'

'

'

70

'

'

'

'

364

723

-2,572

Total other income (expense)

-27,193

'

'

'

-9,793

'

'

'

'

-38,271

-42,444

-47,927

Income (loss) before income taxes and income of consolidated subsidiaries

-19,140

'

'

'

-4,059

'

'

'

'

-12,909

-13,572

-37,301

Equity in income of subsidiaries

0

'

'

'

0

'

'

'

'

0

0

0

Loss before income taxes

-19,140

'

'

'

-4,059

'

'

'

'

-12,909

-13,572

-37,301

Income tax expense (benefit)

-110

'

'

'

28

'

'

'

'

-4,782

90

-426

Less net loss attributable to noncontrolling interest

0

'

'

'

-1,702

'

'

'

'

-3,430

-6,436

-3,775

Net income (loss) attributable to the Parent company

-19,030

'

'

'

-2,385

'

'

'

'

-4,697

-7,226

-33,100

Net loss

-19,030

'

'

'

-4,087

'

'

'

'

-8,127

-13,662

-36,875

Scenario, Previously Reported [Member] | Parent Company [Member]

'

'

'

'

'

'

'

'

'

'

'

'

Condensed Financial Statements, Captions [Line Items]

'

'

'

'

'

'

'

'

'

'

'

'

Revenues

0

'

'

'

0

'

'

'

'

0

0

0

Costs, expenses and other:

'

'

'

'

'

'

'

'

'

'

'

'

Cost of sales

0

'

'

'

0

'

'

'

'

0

0

0

Depreciation, depletion and amortization

76

'

'

'

94

'

'

'

'

354

421

306

Selling and administrative

3,746

'

'

'

3,054

'

'

'

'

12,339

13,748

10,616

Heritage health benefit expenses

3,326

'

'

'

3,689

'

'

'

'

12,361

12,406

17,754

Loss (gain) on sales of assets

0

'

'

'

0

'

'

'

'

0

13

3

Restructuring charges

0

'

'

'

'

'

'

'

'

0

'

'

Other operating income

0

'

'

'

0

'

'

'

'

0

0

0

Total costs, expenses and other

7,148

'

'

'

6,837

'

'

'

'

25,054

26,588

28,679

Operating income (loss)

-7,148

'

'

'

-6,837

'

'

'

'

-25,054

-26,588

-28,679

Other income (expense):

'

'

'

'

'

'

'

'

'

'

'

'

Interest expense

-18,673

'

'

'

-7,584

'

'

'

'

-30,417

-31,301

-16,365

Loss on extinguishment of debt

'

'

'

'

'

'

'

'

'

-64

-1,986

-7,873

Interest income

123

'

'

'

30

'

'

'

'

165

253

266

Loss on foreign exchange

-6,790

'

'

'

'

'

'

'

'

'

'

'

Other income (loss)

1

'

'

'

0

'

'

'

'

1

190

-3,014

Total other income (expense)

-25,339

'

'

'

-7,554

'

'

'

'

-30,315

-32,844

-26,986

Income (loss) before income taxes and income of consolidated subsidiaries

-32,487

'

'

'

-14,391

'

'

'

'

-55,369

-59,432

-55,665

Equity in income of subsidiaries

13,319

'

'

'

10,304

'

'

'

'

42,347

45,762

18,508

Loss before income taxes

-19,168

'

'

'

-4,087

'

'

'

'

-13,022

-13,670

-37,157

Income tax expense (benefit)

-138

'

'

'

0

'

'

'

'

-4,895

-8

-282

Less net loss attributable to noncontrolling interest

0

'

'

'

-1,702

'

'

'

'

-3,430

-6,436

-3,775

Net income (loss) attributable to the Parent company

-19,030

'

'

'

-2,385

'

'

'

'

-4,697

-7,226

-33,100

Net loss

-19,030

'

'

'

-4,087

'

'

'

'

-8,127

-13,662

-36,875

Scenario, Previously Reported [Member] | Co-Issuer [Member]

'

'

'

'

'

'

'

'

'

'

'

'

Condensed Financial Statements, Captions [Line Items]

'

'

'

'

'

'

'

'

'

'

'

'

Revenues

22,012

'

'

'

19,336

'

'

'

'

87,567

81,285

86,785

Costs, expenses and other:

'

'

'

'

'

'

'

'

'

'

'

'

Cost of sales

16,454

'

'

'

16,954

'

'

'

'

63,794

59,299

60,243

Depreciation, depletion and amortization

2,524

'

'

'

2,531

'

'

'

'

10,178

10,085

10,175

Selling and administrative

894

'

'

'

855

'

'

'

'

3,609

3,657

4,059

Heritage health benefit expenses

0

'

'

'

0

'

'

'

'

0

0

0

Loss (gain) on sales of assets

0

'

'

'

0

'

'

'

'

0

0

189

Restructuring charges

397

'

'

'

'

'

'

'

'

5,078

'

'

Other operating income

0

'

'

'

0

'

'

'

'

0

0

0

Total costs, expenses and other

20,269

'

'

'

20,340

'

'

'

'

82,659

73,041

74,666

Operating income (loss)

1,743

'

'

'

-1,004

'

'

'

'

4,908

8,244

12,119

Other income (expense):

'

'

'

'

'

'

'

'

'

'

'

'

Interest expense

-44

'

'

'

-10

'

'

'

'

-39

-39

-469

Loss on extinguishment of debt

'

'

'

'

'

'

'

'

'

0

0

-9,073

Interest income

4

'

'

'

10

'

'

'

'

26

15

14

Loss on foreign exchange

0

'

'

'

'

'

'

'

'

'

'

'

Other income (loss)

0

'

'

'

0

'

'

'

'

0

0

0

Total other income (expense)

-40

'

'

'

0

'

'

'

'

-13

-24

-9,528

Income (loss) before income taxes and income of consolidated subsidiaries

1,703

'

'

'

-1,004

'

'

'

'

4,895

8,220

2,591

Equity in income of subsidiaries

0

'

'

'

0

'

'

'

'

0

0

0

Loss before income taxes

1,703

'

'

'

-1,004

'

'

'

'

4,895

8,220

2,591

Income tax expense (benefit)

0

'

'

'

0

'

'

'

'

680

107

-2,498

Less net loss attributable to noncontrolling interest

0

'

'

'

0

'

'

'

'

0

0

0

Net income (loss) attributable to the Parent company

1,703

'

'

'

-1,004

'

'

'

'

4,215

8,113

5,089

Net loss

1,703

'

'

'

-1,004

'

'

'

'

4,215

8,113

5,089

Scenario, Previously Reported [Member] | Guarantor Subsidiaries [Member]

'

'

'

'

'

'

'

'

'

'

'

'

Condensed Financial Statements, Captions [Line Items]

'

'

'

'

'

'

'

'

'

'

'

'

Revenues

64,292

'

'

'

50,687

'

'

'

'

214,481

184,506

58,544

Costs, expenses and other:

'

'

'

'

'

'

'

'

'

'

'

'

Cost of sales

50,558

'

'

'

40,421

'

'

'

'

174,204

134,683

49,439

Depreciation, depletion and amortization

6,269

'

'

'

5,189

'

'

'

'

27,452

19,571

7,936

Selling and administrative

2,994

'

'

'

2,637

'

'

'

'

11,092

9,993

4,566

Heritage health benefit expenses

0

'

'

'

0

'

'

'

'

0

0

0

Loss (gain) on sales of assets

-1

'

'

'

-133

'

'

'

'

115

251

59

Restructuring charges

0

'

'

'

'

'

'

'

'

0

'

'

Other operating income

150

'

'

'

-4,737

'

'

'

'

-22,367

-17,452

-7,258

Total costs, expenses and other

59,970

'

'

'

43,377

'

'

'

'

190,496

147,046

54,742

Operating income (loss)

4,322

'

'

'

7,310

'

'

'

'

23,985

37,460

3,802

Other income (expense):

'

'

'

'

'

'

'

'

'

'

'

'

Interest expense

-110

'

'

'

-74

'

'

'

'

-295

-378

-657

Loss on extinguishment of debt

'

'

'

'

'

'

'

'

'

0

0

-84

Interest income

25

'

'

'

44

'

'

'

'

522

294

206

Loss on foreign exchange

0

'

'

'

'

'

'

'

'

'

'

'

Other income (loss)

55

'

'

'

92

'

'

'

'

328

395

170

Total other income (expense)

-30

'

'

'

62

'

'

'

'

555

311

-365

Income (loss) before income taxes and income of consolidated subsidiaries

4,292

'

'

'

7,372

'

'

'

'

24,540

37,771

3,437

Equity in income of subsidiaries

0

'

'

'

0

'

'

'

'

0

0

0

Loss before income taxes

4,292

'

'

'

7,372

'

'

'

'

24,540

37,771

3,437

Income tax expense (benefit)

-1,511

'

'

'

496

'

'

'

'

8,461

0

-26

Less net loss attributable to noncontrolling interest

0

'

'

'

0

'

'

'

'

0

0

0

Net income (loss) attributable to the Parent company

5,803

'

'

'

6,876

'

'

'

'

16,079

37,771

3,463

Net loss

5,803

'

'

'

6,876

'

'

'

'

16,079

37,771

3,463

Scenario, Previously Reported [Member] | Non-Guarantor Subsidiaries [Member]

'

'

'

'

'

'

'

'

'

'

'

'

Condensed Financial Statements, Captions [Line Items]

'

'

'

'

'

'

'

'

'

'

'

'

Revenues

93,898

'

'

'

100,401

'

'

'

'

414,085

366,105

411,908

Costs, expenses and other:

'

'

'

'

'

'

'

'

'

'

'

'

Cost of sales

71,618

'

'

'

82,022

'

'

'

'

338,769

303,998

338,629

Depreciation, depletion and amortization

7,190

'

'

'

6,612

'

'

'

'

29,247

27,068

27,177

Selling and administrative

5,697

'

'

'

5,341

'

'

'

'

23,681

24,037

21,508

Heritage health benefit expenses

218

'

'

'

262

'

'

'

'

1,057

982

821

Loss (gain) on sales of assets

39

'

'

'

-101

'

'

'

'

-189

264

389

Restructuring charges

0

'

'

'

'

'

'

'

'

0

'

'

Other operating income

0

'

'

'

0

'

'

'

'

-3

0

0

Total costs, expenses and other

84,762

'

'

'

94,136

'

'

'

'

392,562

356,349

388,524

Operating income (loss)

9,136

'

'

'

6,265

'

'

'

'

21,523

9,756

23,384

Other income (expense):

'

'

'

'

'

'

'

'

'

'

'

'

Interest expense

-1,978

'

'

'

-2,500

'

'

'

'

-9,221

-11,039

-12,370

Loss on extinguishment of debt

'

'

'

'

'

'

'

'

'

0

0

0

Interest income

157

'

'

'

221

'

'

'

'

688

1,014

1,050

Loss on foreign exchange

0

'

'

'

'

'

'

'

'

'

'

'

Other income (loss)

37

'

'

'

-22

'

'

'

'

35

138

272

Total other income (expense)

-1,784

'

'

'

-2,301

'

'

'

'

-8,498

-9,887

-11,048

Income (loss) before income taxes and income of consolidated subsidiaries

7,352

'

'

'

3,964

'

'

'

'

13,025

-131

12,336

Equity in income of subsidiaries

0

'

'

'

0

'

'

'

'

0

0

0

Loss before income taxes

7,352

'

'

'

3,964

'

'

'

'

13,025

-131

12,336

Income tax expense (benefit)

6,626

'

'

'

2,823

'

'

'

'

-47

4,410

7,263

Less net loss attributable to noncontrolling interest

0

'

'

'

0

'

'

'

'

0

0

0

Net income (loss) attributable to the Parent company

726

'

'

'

1,141

'

'

'

'

13,072

-4,541

5,073

Net loss

726

'

'

'

1,141

'

'

'

'

13,072

-4,541

5,073

Scenario, Previously Reported [Member] | Consolidating Adjustments [Member]

'

'

'

'

'

'

'

'

'

'

'

'

Condensed Financial Statements, Captions [Line Items]

'

'

'

'

'

'

'

'

'

'

'

'

Revenues

0

'

'

'

-8,976

'

'

'

'

-41,447

-31,459

-55,524

Costs, expenses and other:

'

'

'

'

'

'

'

'

'

'

'

'

Cost of sales

0

'

'

'

-8,976

'

'

'

'

-41,447

-31,459

-55,524

Depreciation, depletion and amortization

0

'

'

'

0

'

'

'

'

0

0

0

Selling and administrative

0

'

'

'

0

'

'

'

'

0

-1,527

-473

Heritage health benefit expenses

0

'

'

'

0

'

'

'

'

0

0

0

Loss (gain) on sales of assets

0

'

'

'

0

'

'

'

'

0

0

0

Restructuring charges

0

'

'

'

'

'

'

'

'

0

'

'

Other operating income

0

'

'

'

0

'

'

'

'

0

1,527

473

Total costs, expenses and other

0

'

'

'

-8,976

'

'

'

'

-41,447

-31,459

-55,524

Operating income (loss)

0

'

'

'

0

'

'

'

'

0

0

0

Other income (expense):

'

'

'

'

'

'

'

'

'

'

'

'

Interest expense

7

'

'

'

8

'

'

'

'

35

80

92

Loss on extinguishment of debt

'

'

'

'

'

'

'

'

'

0

0

0

Interest income

-7

'

'

'

-8

'

'

'

'

-35

-80

-92

Loss on foreign exchange

0

'

'

'

'

'

'

'

'

'

'

'

Other income (loss)

0

'

'

'

0

'

'

'

'

0

0

0

Total other income (expense)

0

'

'

'

0

'

'

'

'

0

0

0

Income (loss) before income taxes and income of consolidated subsidiaries

0

'

'

'

0

'

'

'

'

0

0

0

Equity in income of subsidiaries

-13,319

'

'

'

-10,304

'

'

'

'

-42,347

-45,762

-18,508

Loss before income taxes

-13,319

'

'

'

-10,304

'

'

'

'

-42,347

-45,762

-18,508

Income tax expense (benefit)

-5,087

'

'

'

-3,291

'

'

'

'

-8,981

-4,419

-4,883

Less net loss attributable to noncontrolling interest

0

'

'

'

0

'

'

'

'

0

0

0

Net income (loss) attributable to the Parent company

-8,232

'

'

'

-7,013

'

'

'

'

-33,366

-41,343

-13,625

Net loss

($8,232)

'

'

'

($7,013)

'

'

'

'

($33,366)

($41,343)

($13,625)

SUPPLEMENTAL_CONSOLIDATING_FIN4

SUPPLEMENTAL CONSOLIDATING FINANCIAL INFORMATION - Supplemental Consolidating Statements of Comprehensive Income (Loss) (Detail) (USD $)	3 Months Ended		12 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2014	Mar. 31, 2013	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Condensed Financial Statements, Captions [Line Items]	'	'	'	'	'
Net income (loss)	($19,030)	($4,087)	($8,127)	($13,662)	($36,875)
Other comprehensive income (loss)	'	'	'	'	'
Amortization of accumulated actuarial gains or losses, pension	359	741	3,490	2,960	1,647
Adjustments to accumulated actuarial losses and transition obligations, pension	'	'	28,974	-9,812	-15,798
Amortization of accumulated actuarial gains or losses, transition obligations, and prior service costs, postretirement medical benefit	5	1,001	4,005	2,572	-288
Adjustments to accumulated actuarial gains and transition obligations, postretirement medical benefits	'	'	53,230	-22,342	-49,136
Tax effect of other comprehensive income gains	-138	0	-4,892	0	0
Unrealized and realized gains and losses on available-for-sale securities	'	'	-57	-268	-200
Other comprehensive loss	226	1,742	84,750	-26,890	-63,775
Comprehensive income (loss) attributable to Westmoreland Coal Company	-18,804	-2,345	76,623	-40,552	-100,650
Parent Company [Member]	'	'	'	'	'
Condensed Financial Statements, Captions [Line Items]	'	'	'	'	'
Net income (loss)	-19,030	-4,087	-8,127	-13,662	-36,875
Other comprehensive income (loss)	'	'	'	'	'
Amortization of accumulated actuarial gains or losses, pension	'	'	3,490	2,960	1,647
Adjustments to accumulated actuarial losses and transition obligations, pension	'	'	28,974	-9,812	-15,798
Amortization of accumulated actuarial gains or losses, transition obligations, and prior service costs, postretirement medical benefit	'	'	4,005	2,572	-288
Adjustments to accumulated actuarial gains and transition obligations, postretirement medical benefits	'	'	53,230	-22,342	-49,136
Tax effect of other comprehensive income gains	'	'	-4,892	'	'
Unrealized and realized gains and losses on available-for-sale securities	'	'	-57	-268	-200
Other comprehensive loss	226	1,742	84,750	-26,890	-63,775
Comprehensive income (loss) attributable to Westmoreland Coal Company	-18,804	-2,345	76,623	-40,552	-100,650
Co-Issuer [Member]	'	'	'	'	'
Condensed Financial Statements, Captions [Line Items]	'	'	'	'	'
Net income (loss)	1,703	-1,004	4,215	8,113	5,089
Other comprehensive income (loss)	'	'	'	'	'
Amortization of accumulated actuarial gains or losses, pension	'	'	28	23	9
Adjustments to accumulated actuarial losses and transition obligations, pension	'	'	180	-52	-150
Amortization of accumulated actuarial gains or losses, transition obligations, and prior service costs, postretirement medical benefit	'	'	0	0	0
Adjustments to accumulated actuarial gains and transition obligations, postretirement medical benefits	'	'	180	0	0
Tax effect of other comprehensive income gains	'	'	0	'	'
Unrealized and realized gains and losses on available-for-sale securities	'	'	0	0	0
Other comprehensive loss	2	6	388	-29	-141
Comprehensive income (loss) attributable to Westmoreland Coal Company	1,705	-998	4,603	8,084	4,948
Guarantor Subsidiaries [Member]	'	'	'	'	'
Condensed Financial Statements, Captions [Line Items]	'	'	'	'	'
Net income (loss)	7,409	10,126	36,310	44,805	15,186
Other comprehensive income (loss)	'	'	'	'	'
Amortization of accumulated actuarial gains or losses, pension	'	'	801	720	86
Adjustments to accumulated actuarial losses and transition obligations, pension	'	'	13,331	-5,144	72
Amortization of accumulated actuarial gains or losses, transition obligations, and prior service costs, postretirement medical benefit	'	'	577	823	348
Adjustments to accumulated actuarial gains and transition obligations, postretirement medical benefits	'	'	14,548	-1,367	-5,934
Tax effect of other comprehensive income gains	'	'	0	'	'
Unrealized and realized gains and losses on available-for-sale securities	'	'	-55	-64	-203
Other comprehensive loss	86	324	29,202	-5,032	-5,631
Comprehensive income (loss) attributable to Westmoreland Coal Company	7,495	10,450	65,512	39,773	9,555
Non-Guarantor Subsidiaries [Member]	'	'	'	'	'
Condensed Financial Statements, Captions [Line Items]	'	'	'	'	'
Net income (loss)	116	-1,612	-1,992	-7,503	-4,029
Other comprehensive income (loss)	'	'	'	'	'
Amortization of accumulated actuarial gains or losses, pension	'	'	61	46	36
Adjustments to accumulated actuarial losses and transition obligations, pension	'	'	475	-22	-516
Amortization of accumulated actuarial gains or losses, transition obligations, and prior service costs, postretirement medical benefit	'	'	275	150	-54
Adjustments to accumulated actuarial gains and transition obligations, postretirement medical benefits	'	'	2,804	-1,467	-3,335
Tax effect of other comprehensive income gains	'	'	0	'	'
Unrealized and realized gains and losses on available-for-sale securities	'	'	0	0	0
Other comprehensive loss	11	82	3,615	-1,293	-3,869
Comprehensive income (loss) attributable to Westmoreland Coal Company	127	-1,530	1,623	-8,796	-7,898
Consolidating Adjustments [Member]	'	'	'	'	'
Condensed Financial Statements, Captions [Line Items]	'	'	'	'	'
Net income (loss)	-9,228	-7,510	-38,533	-45,415	-16,246
Other comprehensive income (loss)	'	'	'	'	'
Amortization of accumulated actuarial gains or losses, pension	'	'	-890	-789	-131
Adjustments to accumulated actuarial losses and transition obligations, pension	'	'	-13,986	5,218	594
Amortization of accumulated actuarial gains or losses, transition obligations, and prior service costs, postretirement medical benefit	'	'	-852	-973	-294
Adjustments to accumulated actuarial gains and transition obligations, postretirement medical benefits	'	'	-17,532	2,834	9,269
Tax effect of other comprehensive income gains	'	'	0	'	'
Unrealized and realized gains and losses on available-for-sale securities	'	'	55	64	203
Other comprehensive loss	-99	-412	-33,205	6,354	9,641
Comprehensive income (loss) attributable to Westmoreland Coal Company	-9,327	-7,922	-71,738	-39,061	-6,605
Scenario, Previously Reported [Member]	'	'	'	'	'
Condensed Financial Statements, Captions [Line Items]	'	'	'	'	'
Net income (loss)	-19,030	-4,087	-8,127	-13,662	-36,875
Other comprehensive income (loss)	'	'	'	'	'
Amortization of accumulated actuarial gains or losses, pension	359	741	3,490	2,960	1,647
Adjustments to accumulated actuarial losses and transition obligations, pension	'	'	28,974	-9,812	-15,798
Amortization of accumulated actuarial gains or losses, transition obligations, and prior service costs, postretirement medical benefit	5	1,001	4,005	2,572	-288
Adjustments to accumulated actuarial gains and transition obligations, postretirement medical benefits	'	'	53,230	-22,342	-49,136
Tax effect of other comprehensive income gains	-138	'	-4,892	'	'
Unrealized and realized gains and losses on available-for-sale securities	'	'	-57	-268	-200
Other comprehensive loss	226	1,742	84,750	-26,890	-63,775
Comprehensive income (loss) attributable to Westmoreland Coal Company	-18,804	-2,345	76,623	-40,552	-100,650
Scenario, Previously Reported [Member] | Parent Company [Member]	'	'	'	'	'
Condensed Financial Statements, Captions [Line Items]	'	'	'	'	'
Net income (loss)	-19,030	-4,087	-8,127	-13,662	-36,875
Other comprehensive income (loss)	'	'	'	'	'
Amortization of accumulated actuarial gains or losses, pension	359	741	3,490	2,960	1,647
Adjustments to accumulated actuarial losses and transition obligations, pension	'	'	28,974	-9,812	-15,798
Amortization of accumulated actuarial gains or losses, transition obligations, and prior service costs, postretirement medical benefit	5	1,001	4,005	2,572	-288
Adjustments to accumulated actuarial gains and transition obligations, postretirement medical benefits	'	'	53,230	-22,342	-49,136
Tax effect of other comprehensive income gains	-138	'	-4,892	'	'
Unrealized and realized gains and losses on available-for-sale securities	'	'	-57	-268	-200
Other comprehensive loss	226	1,742	84,750	-26,890	-63,775
Comprehensive income (loss) attributable to Westmoreland Coal Company	-18,804	-2,345	76,623	-40,552	-100,650
Scenario, Previously Reported [Member] | Co-Issuer [Member]	'	'	'	'	'
Condensed Financial Statements, Captions [Line Items]	'	'	'	'	'
Net income (loss)	1,703	-1,004	4,215	8,113	5,089
Other comprehensive income (loss)	'	'	'	'	'
Amortization of accumulated actuarial gains or losses, pension	2	6	28	23	9
Adjustments to accumulated actuarial losses and transition obligations, pension	'	'	180	-52	-150
Amortization of accumulated actuarial gains or losses, transition obligations, and prior service costs, postretirement medical benefit	0	0	0	0	0
Adjustments to accumulated actuarial gains and transition obligations, postretirement medical benefits	'	'	0	0	0
Tax effect of other comprehensive income gains	0	'	0	'	'
Unrealized and realized gains and losses on available-for-sale securities	'	'	0	0	0
Other comprehensive loss	2	6	208	-29	-141
Comprehensive income (loss) attributable to Westmoreland Coal Company	1,705	-998	4,423	8,084	4,948
Scenario, Previously Reported [Member] | Guarantor Subsidiaries [Member]	'	'	'	'	'
Condensed Financial Statements, Captions [Line Items]	'	'	'	'	'
Net income (loss)	5,803	6,876	16,079	37,771	3,463
Other comprehensive income (loss)	'	'	'	'	'
Amortization of accumulated actuarial gains or losses, pension	0	0	0	0	0
Adjustments to accumulated actuarial losses and transition obligations, pension	'	'	10,554	-3,034	0
Amortization of accumulated actuarial gains or losses, transition obligations, and prior service costs, postretirement medical benefit	-119	0	0	0	0
Adjustments to accumulated actuarial gains and transition obligations, postretirement medical benefits	'	'	11,941	-1,969	0
Tax effect of other comprehensive income gains	0	'	0	'	'
Unrealized and realized gains and losses on available-for-sale securities	'	'	-17	1	-103
Other comprehensive loss	-119	0	22,478	-5,002	-103
Comprehensive income (loss) attributable to Westmoreland Coal Company	5,684	6,876	38,557	32,769	3,360
Scenario, Previously Reported [Member] | Non-Guarantor Subsidiaries [Member]	'	'	'	'	'
Condensed Financial Statements, Captions [Line Items]	'	'	'	'	'
Net income (loss)	726	1,141	13,072	-4,541	5,073
Other comprehensive income (loss)	'	'	'	'	'
Amortization of accumulated actuarial gains or losses, pension	128	193	863	766	702
Adjustments to accumulated actuarial losses and transition obligations, pension	'	'	3,252	-2,132	-444
Amortization of accumulated actuarial gains or losses, transition obligations, and prior service costs, postretirement medical benefit	88	213	852	973	295
Adjustments to accumulated actuarial gains and transition obligations, postretirement medical benefits	'	'	5,411	-865	-9,269
Tax effect of other comprehensive income gains	0	'	0	'	'
Unrealized and realized gains and losses on available-for-sale securities	'	'	-38	-65	-100
Other comprehensive loss	216	406	10,340	-1,323	-8,816
Comprehensive income (loss) attributable to Westmoreland Coal Company	942	1,547	23,412	-5,864	-3,743
Scenario, Previously Reported [Member] | Consolidating Adjustments [Member]	'	'	'	'	'
Condensed Financial Statements, Captions [Line Items]	'	'	'	'	'
Net income (loss)	-8,232	-7,013	-33,366	-41,343	-13,625
Other comprehensive income (loss)	'	'	'	'	'
Amortization of accumulated actuarial gains or losses, pension	-130	-199	-891	-789	-711
Adjustments to accumulated actuarial losses and transition obligations, pension	'	'	-13,986	5,218	594
Amortization of accumulated actuarial gains or losses, transition obligations, and prior service costs, postretirement medical benefit	31	-213	-852	-973	-295
Adjustments to accumulated actuarial gains and transition obligations, postretirement medical benefits	'	'	-17,352	2,834	9,269
Tax effect of other comprehensive income gains	0	'	0	'	'
Unrealized and realized gains and losses on available-for-sale securities	'	'	55	64	203
Other comprehensive loss	-99	-412	-33,026	6,354	9,060
Comprehensive income (loss) attributable to Westmoreland Coal Company	($8,331)	($7,425)	($66,392)	($34,989)	($4,565)

SUPPLEMENTAL_CONSOLIDATING_FIN5

SUPPLEMENTAL CONSOLIDATING FINANCIAL INFORMATION - Supplemental Consolidating Statement of Cash Flow Information (Detail) (USD $)	3 Months Ended		12 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2014	Mar. 31, 2013	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Cash flows from operating activities:	'	'	'	'	'
Net income (loss)	($19,030)	($4,087)	($8,127)	($13,662)	($36,875)
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities:	'	'	'	'	'
Equity in income of subsidiaries	0	0	0	0	0
Loss on derivative instruments	'	'	0	0	3,079
Depreciation, depletion, and amortization	16,059	14,426	67,231	57,145	45,594
Accretion of asset retirement obligation and receivable	3,479	3,180	12,681	12,189	10,878
Amortization of intangible assets and liabilities, net	153	164	665	658	657
Non-cash tax benefits	-138	0	-4,892	0	0
Share-based compensation	728	2,386	5,322	6,040	4,721
Loss (gain) on sales of assets	38	-234	-74	528	640
Amortization of deferred financing costs	271	933	3,731	4,358	2,515
Other	'	'	-1,001	0	0
Loss on extinguishment of debt	'	'	64	1,986	17,030
Gain on sales of investment securities	0	7	-3	-165	-150
Changes in operating assets and liabilities:	'	'	'	'	'
Receivables, net	5,202	120	-7,636	-12,855	5,491
Inventories	4,525	-2,687	-2,512	-2,164	-2,125
Excess of black lung benefit obligation over trust assets	701	83	319	1,791	4,319
Accounts payable and accrued expenses	10,959	3,245	13,579	17,399	4,128
Deferred revenue	-1,302	160	-9,078	-8,198	-9,918
Income tax payable	28	27	-1	0	0
Accrual for workers' compensation	-69	-191	-2,069	-2,096	1,248
Asset retirement obligations	-1,352	-3,207	-9,410	-6,943	-6,510
Accrual for postretirement medical benefits	906	1,985	7,721	6,191	-1,643
Pension and SERP obligations	-293	742	2,388	2,802	-1,278
Other assets and liabilities	1,993	4,164	11,819	-7,860	2,934
Net cash provided by (used in) operating activities	29,648	21,216	80,717	57,144	44,735
Cash flows from investing activities:	'	'	'	'	'
Distributions received by subsidiaries	0	0	0	0	0
Additions to property, plant and equipment	-3,050	-5,301	-28,591	-21,032	-27,594
Change in restricted investments and bond collateral and reclamation deposits	-465,544	-6,435	1,434	-33,892	-5,986
Cash payments related to acquisitions	'	'	0	-72,522	-4,000
Net proceeds from sales of assets	0	441	902	480	687
Proceeds from sale of restricted investments	0	5,619	8,287	4,106	3,350
Receivable from customer for property and equipment purchases	-10	-49	-389	-674	-96
Other	-60	0	-3,540	0	0
Net cash provided by (used in) investing activities	-468,664	-5,725	-21,897	-123,534	-33,639
Cash flows from financing activities:	'	'	'	'	'
Change in book overdrafts	-315	820	310	-253	-724
Borrowings from long-term debt	454,219	0	0	119,364	142,500
Repayments of long-term debt	-6,239	-6,573	-28,088	-44,846	-73,566
Borrowings on revolving lines of credit	0	6,000	7,000	16,500	87,200
Repayments on revolving lines of credit	0	-6,000	-7,000	-16,500	-105,600
Debt issuance and other refinancing costs	-7,598	-156	-182	-5,688	-15,019
Exercise of stock options	'	'	0	0	422
Dividends/distributions	-261	-340	-1,360	-1,360	-21,301
Transactions with Parent/affiliates	0	0	0	0	0
Net cash provided by (used in) financing activities	439,806	-6,249	-29,320	67,217	13,912
Net increase (decrease) in cash and cash equivalents	790	9,242	29,500	827	25,008
Cash and cash equivalents, beginning of year	61,110	31,610	31,610	30,783	5,775
Cash and cash equivalents, end of year	61,900	40,852	61,110	31,610	30,783
Parent Company [Member]	'	'	'	'	'
Cash flows from operating activities:	'	'	'	'	'
Net income (loss)	-19,030	-4,087	-8,127	-13,662	-36,875
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities:	'	'	'	'	'
Equity in income of subsidiaries	'	'	-47,514	-49,834	-21,128
Loss on derivative instruments	'	'	'	'	3,079
Depreciation, depletion, and amortization	'	'	357	421	306
Accretion of asset retirement obligation and receivable	'	'	0	0	0
Amortization of intangible assets and liabilities, net	'	'	0	0	0
Non-cash tax benefits	'	'	-4,892	'	'
Share-based compensation	'	'	2,887	3,054	1,670
Loss (gain) on sales of assets	'	'	0	13	3
Amortization of deferred financing costs	'	'	3,165	2,889	1,485
Other	'	'	0	'	'
Loss on extinguishment of debt	'	'	64	1,986	7,873
Gain on sales of investment securities	'	'	0	-190	0
Changes in operating assets and liabilities:	'	'	'	'	'
Receivables, net	'	'	-936	-280	-270
Inventories	'	'	0	0	0
Excess of black lung benefit obligation over trust assets	'	'	319	1,791	4,319
Accounts payable and accrued expenses	'	'	1,753	4,792	5,944
Deferred revenue	'	'	0	0	0
Income tax payable	'	'	0	'	'
Accrual for workers' compensation	'	'	-2,069	-2,096	1,248
Asset retirement obligations	'	'	0	0	0
Accrual for postretirement medical benefits	'	'	101	-524	-2,879
Pension and SERP obligations	'	'	1,391	1,286	-3,741
Other assets and liabilities	'	'	-170	-247	444
Net cash provided by (used in) operating activities	22,764	-1,885	24,329	-18,630	-15,122
Cash flows from investing activities:	'	'	'	'	'
Distributions received by subsidiaries	'	'	78,000	31,971	23,400
Additions to property, plant and equipment	'	'	-771	-159	-797
Change in restricted investments and bond collateral and reclamation deposits	'	'	49	-3,248	-1,713
Cash payments related to acquisitions	'	'	'	4,000	-4,000
Net proceeds from sales of assets	'	'	0	0	0
Proceeds from sale of restricted investments	'	'	0	1,581	0
Receivable from customer for property and equipment purchases	'	'	0	0	0
Other	'	'	0	'	'
Net cash provided by (used in) investing activities	-471,113	-581	-722	2,174	-6,510
Cash flows from financing activities:	'	'	'	'	'
Change in book overdrafts	'	'	0	0	-146
Borrowings from long-term debt	'	'	'	119,364	142,500
Repayments of long-term debt	'	'	-500	-23,000	-2,532
Borrowings on revolving lines of credit	'	'	0	0	0
Repayments on revolving lines of credit	'	'	0	0	0
Debt issuance and other refinancing costs	'	'	-26	-5,666	-6,042
Exercise of stock options	'	'	'	'	422
Dividends/distributions	'	'	-1,360	-1,360	-21,301
Transactions with Parent/affiliates	'	'	-11,231	-84,186	-65,400
Net cash provided by (used in) financing activities	451,782	-1,399	-13,117	5,152	47,501
Net increase (decrease) in cash and cash equivalents	3,433	-3,865	10,490	-11,304	25,869
Cash and cash equivalents, beginning of year	25,326	14,836	14,836	26,140	271
Cash and cash equivalents, end of year	28,759	10,971	25,326	14,836	26,140
Co-Issuer [Member]	'	'	'	'	'
Cash flows from operating activities:	'	'	'	'	'
Net income (loss)	1,703	-1,004	4,215	8,113	5,089
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities:	'	'	'	'	'
Equity in income of subsidiaries	'	'	0	0	0
Loss on derivative instruments	'	'	'	'	0
Depreciation, depletion, and amortization	'	'	10,178	10,085	10,175
Accretion of asset retirement obligation and receivable	'	'	63	59	55
Amortization of intangible assets and liabilities, net	'	'	622	622	621
Non-cash tax benefits	'	'	0	'	'
Share-based compensation	'	'	37	44	32
Loss (gain) on sales of assets	'	'	0	0	189
Amortization of deferred financing costs	'	'	0	0	-21
Other	'	'	0	'	'
Loss on extinguishment of debt	'	'	0	0	9,073
Gain on sales of investment securities	'	'	0	0	0
Changes in operating assets and liabilities:	'	'	'	'	'
Receivables, net	'	'	-126	-151	1,479
Inventories	'	'	-3,114	709	-1,820
Excess of black lung benefit obligation over trust assets	'	'	0	0	0
Accounts payable and accrued expenses	'	'	5,141	-3,208	-1,063
Deferred revenue	'	'	-8,706	-8,312	-8,774
Income tax payable	'	'	0	'	'
Accrual for workers' compensation	'	'	0	0	0
Asset retirement obligations	'	'	0	0	0
Accrual for postretirement medical benefits	'	'	0	0	0
Pension and SERP obligations	'	'	18	15	-50
Other assets and liabilities	'	'	4,983	-536	-530
Net cash provided by (used in) operating activities	3,085	6,914	13,311	7,440	14,455
Cash flows from investing activities:	'	'	'	'	'
Distributions received by subsidiaries	'	'	0	0	0
Additions to property, plant and equipment	'	'	-790	-2,067	-2,119
Change in restricted investments and bond collateral and reclamation deposits	'	'	-8	-7	2,580
Cash payments related to acquisitions	'	'	'	0	0
Net proceeds from sales of assets	'	'	0	0	0
Proceeds from sale of restricted investments	'	'	0	0	0
Receivable from customer for property and equipment purchases	'	'	0	0	0
Other	'	'	0	'	'
Net cash provided by (used in) investing activities	5,963	-137	-798	-2,074	461
Cash flows from financing activities:	'	'	'	'	'
Change in book overdrafts	'	'	0	-259	259
Borrowings from long-term debt	'	'	'	0	0
Repayments of long-term debt	'	'	0	0	-46,220
Borrowings on revolving lines of credit	'	'	0	0	1,500
Repayments on revolving lines of credit	'	'	0	0	-1,500
Debt issuance and other refinancing costs	'	'	0	0	-9,077
Exercise of stock options	'	'	'	'	0
Dividends/distributions	'	'	-14,500	-1,050	-10,700
Transactions with Parent/affiliates	'	'	783	482	49,948
Net cash provided by (used in) financing activities	-8,346	-6,515	-13,717	-827	-15,790
Net increase (decrease) in cash and cash equivalents	702	262	-1,204	4,539	-874
Cash and cash equivalents, beginning of year	3,341	4,545	4,545	6	880
Cash and cash equivalents, end of year	4,043	4,807	3,341	4,545	6
Guarantor Subsidiaries [Member]	'	'	'	'	'
Cash flows from operating activities:	'	'	'	'	'
Net income (loss)	7,409	10,126	36,310	44,805	15,186
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities:	'	'	'	'	'
Equity in income of subsidiaries	'	'	0	0	0
Loss on derivative instruments	'	'	'	'	0
Depreciation, depletion, and amortization	'	'	56,696	46,639	35,113
Accretion of asset retirement obligation and receivable	'	'	12,618	12,130	10,823
Amortization of intangible assets and liabilities, net	'	'	43	36	36
Non-cash tax benefits	'	'	0	'	'
Share-based compensation	'	'	2,398	2,942	3,019
Loss (gain) on sales of assets	'	'	-74	515	448
Amortization of deferred financing costs	'	'	566	1,469	1,051
Other	'	'	-1,001	'	'
Loss on extinguishment of debt	'	'	0	0	84
Gain on sales of investment securities	'	'	-3	25	-150
Changes in operating assets and liabilities:	'	'	'	'	'
Receivables, net	'	'	10,945	-22,246	1,367
Inventories	'	'	602	-2,873	-305
Excess of black lung benefit obligation over trust assets	'	'	0	0	0
Accounts payable and accrued expenses	'	'	4,545	18,551	-940
Deferred revenue	'	'	-372	114	-1,144
Income tax payable	'	'	-1	'	'
Accrual for workers' compensation	'	'	0	0	0
Asset retirement obligations	'	'	-9,410	-6,943	-6,510
Accrual for postretirement medical benefits	'	'	7,300	6,828	1,132
Pension and SERP obligations	'	'	941	1,602	2,520
Other assets and liabilities	'	'	13,383	-7,185	3,405
Net cash provided by (used in) operating activities	33,855	32,695	135,486	96,409	65,135
Cash flows from investing activities:	'	'	'	'	'
Distributions received by subsidiaries	'	'	0	0	0
Additions to property, plant and equipment	'	'	-27,030	-18,806	-24,678
Change in restricted investments and bond collateral and reclamation deposits	'	'	1,393	-30,637	-6,853
Cash payments related to acquisitions	'	'	'	-76,522	0
Net proceeds from sales of assets	'	'	902	480	687
Proceeds from sale of restricted investments	'	'	8,287	2,525	3,350
Receivable from customer for property and equipment purchases	'	'	-389	-674	-96
Other	'	'	-3,540	'	'
Net cash provided by (used in) investing activities	-3,514	-5,010	-20,377	-123,634	-27,590
Cash flows from financing activities:	'	'	'	'	'
Change in book overdrafts	'	'	310	6	-837
Borrowings from long-term debt	'	'	'	0	0
Repayments of long-term debt	'	'	-27,588	-21,846	-24,814
Borrowings on revolving lines of credit	'	'	7,000	16,500	85,700
Repayments on revolving lines of credit	'	'	-7,000	-16,500	-104,100
Debt issuance and other refinancing costs	'	'	-156	-22	100
Exercise of stock options	'	'	'	'	0
Dividends/distributions	'	'	-63,500	-30,921	-11,700
Transactions with Parent/affiliates	'	'	-6,960	86,863	21,135
Net cash provided by (used in) financing activities	-30,525	-14,789	-97,894	34,080	-34,516
Net increase (decrease) in cash and cash equivalents	-184	12,896	17,215	6,855	3,029
Cash and cash equivalents, beginning of year	27,451	10,236	10,236	3,381	352
Cash and cash equivalents, end of year	27,267	23,132	27,451	10,236	3,381
Non-Guarantor Subsidiaries [Member]	'	'	'	'	'
Cash flows from operating activities:	'	'	'	'	'
Net income (loss)	116	-1,612	-1,992	-7,503	-4,029
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities:	'	'	'	'	'
Equity in income of subsidiaries	'	'	0	0	0
Loss on derivative instruments	'	'	'	'	0
Depreciation, depletion, and amortization	'	'	0	0	0
Accretion of asset retirement obligation and receivable	'	'	0	0	0
Amortization of intangible assets and liabilities, net	'	'	0	0	0
Non-cash tax benefits	'	'	0	'	'
Share-based compensation	'	'	0	0	0
Loss (gain) on sales of assets	'	'	0	0	0
Amortization of deferred financing costs	'	'	0	0	0
Other	'	'	0	'	'
Loss on extinguishment of debt	'	'	0	0	0
Gain on sales of investment securities	'	'	0	0	0
Changes in operating assets and liabilities:	'	'	'	'	'
Receivables, net	'	'	-4,225	1,865	-3,334
Inventories	'	'	0	0	0
Excess of black lung benefit obligation over trust assets	'	'	0	0	0
Accounts payable and accrued expenses	'	'	-12,683	5,488	4,326
Deferred revenue	'	'	0	0	0
Income tax payable	'	'	0	'	'
Accrual for workers' compensation	'	'	0	0	0
Asset retirement obligations	'	'	0	0	0
Accrual for postretirement medical benefits	'	'	320	-113	104
Pension and SERP obligations	'	'	38	-101	-7
Other assets and liabilities	'	'	-1,025	-1,892	42
Net cash provided by (used in) operating activities	-1,152	-1,727	-19,567	-2,256	-2,898
Cash flows from investing activities:	'	'	'	'	'
Distributions received by subsidiaries	'	'	0	0	0
Additions to property, plant and equipment	'	'	0	0	0
Change in restricted investments and bond collateral and reclamation deposits	'	'	0	0	0
Cash payments related to acquisitions	'	'	'	0	0
Net proceeds from sales of assets	'	'	0	0	0
Proceeds from sale of restricted investments	'	'	0	0	0
Receivable from customer for property and equipment purchases	'	'	0	0	0
Other	'	'	0	'	'
Net cash provided by (used in) investing activities	0	3	0	0	0
Cash flows from financing activities:	'	'	'	'	'
Change in book overdrafts	'	'	0	0	0
Borrowings from long-term debt	'	'	'	0	0
Repayments of long-term debt	'	'	0	0	0
Borrowings on revolving lines of credit	'	'	0	0	0
Repayments on revolving lines of credit	'	'	0	0	0
Debt issuance and other refinancing costs	'	'	0	0	0
Exercise of stock options	'	'	'	'	0
Dividends/distributions	'	'	0	0	-1,000
Transactions with Parent/affiliates	'	'	22,566	2,993	882
Net cash provided by (used in) financing activities	-2,009	1,673	22,566	2,993	-118
Net increase (decrease) in cash and cash equivalents	-3,161	-51	2,999	737	-3,016
Cash and cash equivalents, beginning of year	4,992	1,993	1,993	1,256	4,272
Cash and cash equivalents, end of year	1,831	1,942	4,992	1,993	1,256
Consolidating Adjustments [Member]	'	'	'	'	'
Cash flows from operating activities:	'	'	'	'	'
Net income (loss)	-9,228	-7,510	-38,533	-45,415	-16,246
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities:	'	'	'	'	'
Equity in income of subsidiaries	'	'	47,514	49,834	21,128
Loss on derivative instruments	'	'	'	'	0
Depreciation, depletion, and amortization	'	'	0	0	0
Accretion of asset retirement obligation and receivable	'	'	0	0	0
Amortization of intangible assets and liabilities, net	'	'	0	0	0
Non-cash tax benefits	'	'	0	'	'
Share-based compensation	'	'	0	0	0
Loss (gain) on sales of assets	'	'	0	0	0
Amortization of deferred financing costs	'	'	0	0	0
Other	'	'	0	'	'
Loss on extinguishment of debt	'	'	0	0	0
Gain on sales of investment securities	'	'	0	0	0
Changes in operating assets and liabilities:	'	'	'	'	'
Receivables, net	'	'	-13,294	7,957	6,249
Inventories	'	'	0	0	0
Excess of black lung benefit obligation over trust assets	'	'	0	0	0
Accounts payable and accrued expenses	'	'	14,823	-8,224	-4,139
Deferred revenue	'	'	0	0	0
Income tax payable	'	'	0	'	'
Accrual for workers' compensation	'	'	0	0	0
Asset retirement obligations	'	'	0	0	0
Accrual for postretirement medical benefits	'	'	0	0	0
Pension and SERP obligations	'	'	0	0	0
Other assets and liabilities	'	'	-5,352	2,000	-427
Net cash provided by (used in) operating activities	-28,904	-14,781	-72,842	-25,819	-16,835
Cash flows from investing activities:	'	'	'	'	'
Distributions received by subsidiaries	'	'	-78,000	-31,971	-23,400
Additions to property, plant and equipment	'	'	0	0	0
Change in restricted investments and bond collateral and reclamation deposits	'	'	0	0	0
Cash payments related to acquisitions	'	'	'	0	0
Net proceeds from sales of assets	'	'	0	0	0
Proceeds from sale of restricted investments	'	'	0	0	0
Receivable from customer for property and equipment purchases	'	'	0	0	0
Other	'	'	0	'	'
Net cash provided by (used in) investing activities	0	0	0	0	0
Cash flows from financing activities:	'	'	'	'	'
Change in book overdrafts	'	'	0	0	0
Borrowings from long-term debt	'	'	'	0	0
Repayments of long-term debt	'	'	0	0	0
Borrowings on revolving lines of credit	'	'	0	0	0
Repayments on revolving lines of credit	'	'	0	0	0
Debt issuance and other refinancing costs	'	'	0	0	0
Exercise of stock options	'	'	'	'	0
Dividends/distributions	'	'	78,000	31,971	23,400
Transactions with Parent/affiliates	'	'	-5,158	-6,152	-6,565
Net cash provided by (used in) financing activities	28,904	14,781	72,842	25,819	16,835
Net increase (decrease) in cash and cash equivalents	0	0	0	0	0
Cash and cash equivalents, beginning of year	0	0	0	0	0
Cash and cash equivalents, end of year	0	0	0	0	0
Scenario, Previously Reported [Member]	'	'	'	'	'
Cash flows from operating activities:	'	'	'	'	'
Net income (loss)	-19,030	-4,087	-8,127	-13,662	-36,875
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities:	'	'	'	'	'
Equity in income of subsidiaries	0	0	0	0	0
Loss on derivative instruments	'	'	'	'	3,079
Depreciation, depletion, and amortization	16,059	14,426	67,231	57,145	45,594
Accretion of asset retirement obligation and receivable	3,479	3,180	12,681	12,189	10,878
Amortization of intangible assets and liabilities, net	153	164	665	658	657
Non-cash tax benefits	-138	'	-4,892	'	'
Share-based compensation	728	2,386	5,322	6,040	4,721
Loss (gain) on sales of assets	38	-234	-74	528	640
Amortization of deferred financing costs	271	933	3,731	4,358	2,515
Other	'	'	-1,001	'	'
Loss on extinguishment of debt	'	'	64	1,986	17,030
Gain on sales of investment securities	'	7	-3	-165	-150
Changes in operating assets and liabilities:	'	'	'	'	'
Receivables, net	5,202	120	-7,636	-12,855	5,491
Inventories	4,525	-2,687	-2,512	-2,164	-2,125
Excess of black lung benefit obligation over trust assets	701	83	319	1,791	4,319
Accounts payable and accrued expenses	10,959	3,245	13,579	17,399	4,128
Deferred revenue	-1,302	160	-9,078	-8,198	-9,918
Income tax payable	28	27	-1	'	'
Accrual for workers' compensation	-69	-191	-2,069	-2,096	1,248
Asset retirement obligations	-1,352	-3,207	-9,410	-6,943	-6,510
Accrual for postretirement medical benefits	906	1,985	7,721	6,191	-1,643
Pension and SERP obligations	-293	742	2,388	2,802	-1,278
Other assets and liabilities	1,993	4,164	11,819	-7,860	2,934
Net cash provided by (used in) operating activities	29,648	21,216	80,717	57,144	44,735
Cash flows from investing activities:	'	'	'	'	'
Distributions received by subsidiaries	0	0	0	0	0
Additions to property, plant and equipment	-3,050	-5,301	-28,591	-21,032	-27,594
Change in restricted investments and bond collateral and reclamation deposits	-465,544	-6,435	1,434	-33,892	-5,986
Cash payments related to acquisitions	'	'	'	-72,522	-4,000
Net proceeds from sales of assets	'	441	902	480	687
Proceeds from sale of restricted investments	'	5,619	8,287	4,106	3,350
Receivable from customer for property and equipment purchases	-10	-49	-389	-674	-96
Other	-60	'	-3,540	'	'
Net cash provided by (used in) investing activities	-468,664	-5,725	-21,897	-123,534	-33,639
Cash flows from financing activities:	'	'	'	'	'
Change in book overdrafts	-315	820	310	-253	-724
Borrowings from long-term debt	454,219	'	'	119,364	142,500
Repayments of long-term debt	-6,239	-6,573	-28,088	-44,846	-73,566
Borrowings on revolving lines of credit	'	6,000	7,000	16,500	87,200
Repayments on revolving lines of credit	'	-6,000	-7,000	-16,500	-105,600
Debt issuance and other refinancing costs	-7,598	-156	-182	-5,688	-15,019
Exercise of stock options	'	'	'	'	422
Dividends/distributions	-261	-340	-1,360	-1,360	-21,301
Transactions with Parent/affiliates	0	0	0	0	0
Net cash provided by (used in) financing activities	439,806	-6,249	-29,320	67,217	13,912
Net increase (decrease) in cash and cash equivalents	790	9,242	29,500	827	25,008
Cash and cash equivalents, beginning of year	61,110	31,610	31,610	30,783	5,775
Cash and cash equivalents, end of year	61,900	40,852	61,110	31,610	30,783
Scenario, Previously Reported [Member] | Parent Company [Member]	'	'	'	'	'
Cash flows from operating activities:	'	'	'	'	'
Net income (loss)	-19,030	-4,087	-8,127	-13,662	-36,875
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities:	'	'	'	'	'
Equity in income of subsidiaries	-13,319	-10,304	-42,347	-45,762	-18,508
Loss on derivative instruments	'	'	'	'	3,079
Depreciation, depletion, and amortization	76	94	354	421	306
Accretion of asset retirement obligation and receivable	0	0	0	0	0
Amortization of intangible assets and liabilities, net	0	0	0	0	0
Non-cash tax benefits	-138	'	-4,892	'	'
Share-based compensation	569	682	2,437	2,716	1,671
Loss (gain) on sales of assets	0	0	0	13	3
Amortization of deferred financing costs	149	771	3,165	2,889	1,485
Other	'	'	0	'	'
Loss on extinguishment of debt	'	'	64	1,986	7,873
Gain on sales of investment securities	'	0	0	-190	0
Changes in operating assets and liabilities:	'	'	'	'	'
Receivables, net	-178	49	-18	147	-158
Inventories	0	0	0	0	0
Excess of black lung benefit obligation over trust assets	701	83	319	1,791	4,319
Accounts payable and accrued expenses	5,670	-8,202	-613	4,981	5,849
Deferred revenue	0	0	0	0	0
Income tax payable	0	0	0	'	'
Accrual for workers' compensation	-69	-191	-2,069	-2,096	1,248
Asset retirement obligations	0	0	0	0	0
Accrual for postretirement medical benefits	-374	-100	101	-524	-2,878
Pension and SERP obligations	83	320	1,391	1,286	-4,320
Other assets and liabilities	-183	-187	-144	-243	444
Net cash provided by (used in) operating activities	23,247	-1,472	27,621	-14,276	-13,062
Cash flows from investing activities:	'	'	'	'	'
Distributions received by subsidiaries	42,500	19,600	78,000	31,971	23,400
Additions to property, plant and equipment	38	-157	-737	-159	-797
Change in restricted investments and bond collateral and reclamation deposits	-471,151	-398	49	-3,248	-1,714
Cash payments related to acquisitions	'	'	'	4,000	-4,000
Net proceeds from sales of assets	'	0	0	0	0
Proceeds from sale of restricted investments	'	0	0	1,581	0
Receivable from customer for property and equipment purchases	0	0	0	0	0
Other	0	'	0	'	'
Net cash provided by (used in) investing activities	-471,113	-555	-688	2,174	-6,511
Cash flows from financing activities:	'	'	'	'	'
Change in book overdrafts	0	0	0	0	-146
Borrowings from long-term debt	454,219	'	'	119,364	142,500
Repayments of long-term debt	0	0	-500	-23,000	-2,532
Borrowings on revolving lines of credit	'	0	0	0	0
Repayments on revolving lines of credit	'	0	0	0	0
Debt issuance and other refinancing costs	-7,598	0	-26	-5,666	-6,042
Exercise of stock options	'	'	'	'	422
Dividends/distributions	-261	-340	-1,360	-1,360	-21,301
Transactions with Parent/affiliates	4,939	-22,106	-14,557	-88,541	-67,458
Net cash provided by (used in) financing activities	451,299	-22,446	-16,443	797	45,443
Net increase (decrease) in cash and cash equivalents	3,433	-24,473	10,490	-11,305	25,870
Cash and cash equivalents, beginning of year	25,326	14,836	14,836	26,141	271
Cash and cash equivalents, end of year	28,759	-9,637	25,326	14,836	26,141
Scenario, Previously Reported [Member] | Co-Issuer [Member]	'	'	'	'	'
Cash flows from operating activities:	'	'	'	'	'
Net income (loss)	1,703	-1,004	4,215	8,113	5,089
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities:	'	'	'	'	'
Equity in income of subsidiaries	0	0	0	0	0
Loss on derivative instruments	'	'	'	'	0
Depreciation, depletion, and amortization	2,524	2,531	10,178	10,085	10,175
Accretion of asset retirement obligation and receivable	18	16	63	59	55
Amortization of intangible assets and liabilities, net	146	156	622	622	621
Non-cash tax benefits	0	'	0	'	'
Share-based compensation	7	10	37	44	32
Loss (gain) on sales of assets	0	0	0	0	189
Amortization of deferred financing costs	0	0	0	0	-21
Other	'	'	0	'	'
Loss on extinguishment of debt	'	'	0	0	9,073
Gain on sales of investment securities	'	0	0	0	0
Changes in operating assets and liabilities:	'	'	'	'	'
Receivables, net	480	2,885	-126	-151	1,479
Inventories	4,316	-2,181	-3,114	709	-1,820
Excess of black lung benefit obligation over trust assets	0	0	0	0	0
Accounts payable and accrued expenses	-3,386	5,960	5,141	-3,209	-1,063
Deferred revenue	-2,415	-1,927	-8,706	-8,312	-8,774
Income tax payable	0	0	0	'	'
Accrual for workers' compensation	0	0	0	0	0
Asset retirement obligations	0	0	0	0	0
Accrual for postretirement medical benefits	0	0	0	0	0
Pension and SERP obligations	1	4	18	15	-50
Other assets and liabilities	-309	465	4,983	-536	-529
Net cash provided by (used in) operating activities	3,085	6,915	13,311	7,439	14,456
Cash flows from investing activities:	'	'	'	'	'
Distributions received by subsidiaries	0	0	0	0	0
Additions to property, plant and equipment	-35	-134	-790	-2,067	-2,119
Change in restricted investments and bond collateral and reclamation deposits	5,998	-3	-8	-7	2,581
Cash payments related to acquisitions	'	'	'	0	0
Net proceeds from sales of assets	'	0	0	0	0
Proceeds from sale of restricted investments	'	0	0	0	0
Receivable from customer for property and equipment purchases	0	0	0	0	0
Other	0	'	0	'	'
Net cash provided by (used in) investing activities	5,963	-137	-798	-2,074	462
Cash flows from financing activities:	'	'	'	'	'
Change in book overdrafts	0	0	0	-259	259
Borrowings from long-term debt	0	'	'	0	0
Repayments of long-term debt	0	0	0	0	-46,220
Borrowings on revolving lines of credit	'	0	0	0	1,500
Repayments on revolving lines of credit	'	0	0	0	-1,500
Debt issuance and other refinancing costs	0	0	0	0	-9,077
Exercise of stock options	'	'	'	'	0
Dividends/distributions	-8,500	-6,500	-14,500	-1,050	-10,700
Transactions with Parent/affiliates	154	-16	783	483	49,946
Net cash provided by (used in) financing activities	-8,346	-6,516	-13,717	-826	-15,792
Net increase (decrease) in cash and cash equivalents	702	262	-1,204	4,539	-874
Cash and cash equivalents, beginning of year	3,341	4,545	4,545	6	880
Cash and cash equivalents, end of year	4,043	4,807	3,341	4,545	6
Scenario, Previously Reported [Member] | Guarantor Subsidiaries [Member]	'	'	'	'	'
Cash flows from operating activities:	'	'	'	'	'
Net income (loss)	5,803	6,876	16,079	37,771	3,463
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities:	'	'	'	'	'
Equity in income of subsidiaries	0	0	0	0	0
Loss on derivative instruments	'	'	'	'	0
Depreciation, depletion, and amortization	6,269	5,189	27,452	19,571	7,936
Accretion of asset retirement obligation and receivable	1,278	1,050	4,192	4,038	3,034
Amortization of intangible assets and liabilities, net	0	0	0	0	0
Non-cash tax benefits	0	'	0	'	'
Share-based compensation	37	681	914	559	249
Loss (gain) on sales of assets	-1	-133	115	251	59
Amortization of deferred financing costs	0	13	49	847	383
Other	'	'	-1,001	'	'
Loss on extinguishment of debt	'	'	0	0	84
Gain on sales of investment securities	'	7	19	0	-75
Changes in operating assets and liabilities:	'	'	'	'	'
Receivables, net	-2,738	-2,467	9,871	-20,910	-4,343
Inventories	944	-753	187	-2,389	134
Excess of black lung benefit obligation over trust assets	0	0	0	0	0
Accounts payable and accrued expenses	7,356	-10	4,082	18,396	378
Deferred revenue	844	1,703	972	772	-349
Income tax payable	0	-1,679	-1,679	'	'
Accrual for workers' compensation	0	0	0	0	0
Asset retirement obligations	-9	-190	-1,971	-1,198	-875
Accrual for postretirement medical benefits	935	1,478	5,620	4,858	0
Pension and SERP obligations	113	177	589	709	0
Other assets and liabilities	-1,616	-195	8,206	1,047	3,839
Net cash provided by (used in) operating activities	19,215	11,747	73,696	64,322	13,917
Cash flows from investing activities:	'	'	'	'	'
Distributions received by subsidiaries	0	0	0	0	0
Additions to property, plant and equipment	-2,609	-4,224	-17,156	-8,385	-2,569
Change in restricted investments and bond collateral and reclamation deposits	4	-151	1,766	-27,504	-3,738
Cash payments related to acquisitions	'	'	'	-76,522	0
Net proceeds from sales of assets	'	309	534	240	250
Proceeds from sale of restricted investments	'	120	788	1,889	1,075
Receivable from customer for property and equipment purchases	0	0	0	0	0
Other	0	'	-2,500	'	'
Net cash provided by (used in) investing activities	-2,605	-3,946	-16,568	-110,282	-4,982
Cash flows from financing activities:	'	'	'	'	'
Change in book overdrafts	-317	-7	310	6	-694
Borrowings from long-term debt	0	'	'	0	0
Repayments of long-term debt	-875	-713	-2,322	-2,494	-11,982
Borrowings on revolving lines of credit	'	0	0	0	12,200
Repayments on revolving lines of credit	'	0	0	0	-29,100
Debt issuance and other refinancing costs	0	0	0	0	100
Exercise of stock options	'	'	'	'	0
Dividends/distributions	-18,000	-8,000	-44,500	-19,173	0
Transactions with Parent/affiliates	3,434	2,255	-8,036	72,840	20,684
Net cash provided by (used in) financing activities	-15,758	-6,465	-54,548	51,179	-8,792
Net increase (decrease) in cash and cash equivalents	852	1,336	2,580	5,219	143
Cash and cash equivalents, beginning of year	7,942	5,362	5,362	143	0
Cash and cash equivalents, end of year	8,794	6,698	7,942	5,362	143
Scenario, Previously Reported [Member] | Non-Guarantor Subsidiaries [Member]	'	'	'	'	'
Cash flows from operating activities:	'	'	'	'	'
Net income (loss)	726	1,141	13,072	-4,541	5,073
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities:	'	'	'	'	'
Equity in income of subsidiaries	0	0	0	0	0
Loss on derivative instruments	'	'	'	'	0
Depreciation, depletion, and amortization	7,190	6,612	29,247	27,068	27,177
Accretion of asset retirement obligation and receivable	2,183	2,114	8,426	8,092	7,789
Amortization of intangible assets and liabilities, net	7	8	43	36	36
Non-cash tax benefits	0	'	0	'	'
Share-based compensation	115	1,013	1,934	2,721	2,769
Loss (gain) on sales of assets	39	-101	-189	264	389
Amortization of deferred financing costs	122	149	517	622	668
Other	'	'	0	'	'
Loss on extinguishment of debt	'	'	0	0	0
Gain on sales of investment securities	'	0	-22	25	-75
Changes in operating assets and liabilities:	'	'	'	'	'
Receivables, net	6,104	-3,355	-4,069	102	2,263
Inventories	-735	247	415	-484	-439
Excess of black lung benefit obligation over trust assets	0	0	0	0	0
Accounts payable and accrued expenses	1,327	6,979	-9,852	5,453	3,103
Deferred revenue	269	384	-1,344	-658	-795
Income tax payable	28	1,706	1,678	'	'
Accrual for workers' compensation	0	0	0	0	0
Asset retirement obligations	-1,343	-3,017	-7,439	-5,745	-5,635
Accrual for postretirement medical benefits	345	607	2,000	1,857	1,235
Pension and SERP obligations	-490	241	390	792	3,092
Other assets and liabilities	-2,880	4,081	4,124	-10,128	-392
Net cash provided by (used in) operating activities	13,007	18,809	38,931	25,476	46,258
Cash flows from investing activities:	'	'	'	'	'
Distributions received by subsidiaries	0	0	0	0	0
Additions to property, plant and equipment	-444	-786	-9,908	-10,421	-22,109
Change in restricted investments and bond collateral and reclamation deposits	-395	-5,883	-373	-3,133	-3,115
Cash payments related to acquisitions	'	'	'	0	0
Net proceeds from sales of assets	'	132	368	240	437
Proceeds from sale of restricted investments	'	5,499	7,499	636	2,275
Receivable from customer for property and equipment purchases	-10	-49	-389	-674	-96
Other	-60	'	-1,040	'	'
Net cash provided by (used in) investing activities	-909	-1,087	-3,843	-13,352	-22,608
Cash flows from financing activities:	'	'	'	'	'
Change in book overdrafts	2	827	0	0	-143
Borrowings from long-term debt	0	'	'	0	0
Repayments of long-term debt	-5,364	-5,860	-25,266	-19,352	-12,832
Borrowings on revolving lines of credit	'	6,000	7,000	16,500	73,500
Repayments on revolving lines of credit	'	-6,000	-7,000	-16,500	-75,000
Debt issuance and other refinancing costs	0	-156	-156	-22	0
Exercise of stock options	'	'	'	'	0
Dividends/distributions	-16,000	-5,100	-19,000	-11,748	-12,700
Transactions with Parent/affiliates	5,067	4,076	26,968	21,372	3,394
Net cash provided by (used in) financing activities	-16,295	-6,213	-17,454	-9,750	-23,781
Net increase (decrease) in cash and cash equivalents	-4,197	11,509	17,634	2,374	-131
Cash and cash equivalents, beginning of year	24,501	6,867	6,867	4,493	4,624
Cash and cash equivalents, end of year	20,304	18,376	24,501	6,867	4,493
Scenario, Previously Reported [Member] | Consolidating Adjustments [Member]	'	'	'	'	'
Cash flows from operating activities:	'	'	'	'	'
Net income (loss)	-8,232	-7,013	-33,366	-41,343	-13,625
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities:	'	'	'	'	'
Equity in income of subsidiaries	13,319	10,304	42,347	45,762	18,508
Loss on derivative instruments	'	'	'	'	0
Depreciation, depletion, and amortization	0	0	0	0	0
Accretion of asset retirement obligation and receivable	0	0	0	0	0
Amortization of intangible assets and liabilities, net	0	0	0	0	0
Non-cash tax benefits	0	'	0	'	'
Share-based compensation	0	0	0	0	0
Loss (gain) on sales of assets	0	0	0	0	0
Amortization of deferred financing costs	0	0	0	0	0
Other	'	'	0	'	'
Loss on extinguishment of debt	'	'	0	0	0
Gain on sales of investment securities	'	0	0	0	0
Changes in operating assets and liabilities:	'	'	'	'	'
Receivables, net	1,534	3,008	-13,294	7,957	6,250
Inventories	0	0	0	0	0
Excess of black lung benefit obligation over trust assets	0	0	0	0	0
Accounts payable and accrued expenses	-8	-1,482	14,821	-8,222	-4,139
Deferred revenue	0	0	0	0	0
Income tax payable	0	0	0	'	'
Accrual for workers' compensation	0	0	0	0	0
Asset retirement obligations	0	0	0	0	0
Accrual for postretirement medical benefits	0	0	0	0	0
Pension and SERP obligations	0	0	0	0	0
Other assets and liabilities	6,981	0	-5,350	2,000	-428
Net cash provided by (used in) operating activities	-28,906	-14,783	-72,842	-25,817	-16,834
Cash flows from investing activities:	'	'	'	'	'
Distributions received by subsidiaries	-42,500	-19,600	-78,000	-31,971	-23,400
Additions to property, plant and equipment	0	0	0	0	0
Change in restricted investments and bond collateral and reclamation deposits	0	0	0	0	0
Cash payments related to acquisitions	'	'	'	0	0
Net proceeds from sales of assets	'	0	0	0	0
Proceeds from sale of restricted investments	'	0	0	0	0
Receivable from customer for property and equipment purchases	0	0	0	0	0
Other	0	'	0	'	'
Net cash provided by (used in) investing activities	0	0	0	0	0
Cash flows from financing activities:	'	'	'	'	'
Change in book overdrafts	0	0	0	0	0
Borrowings from long-term debt	0	'	'	0	0
Repayments of long-term debt	0	0	0	0	0
Borrowings on revolving lines of credit	'	0	0	0	0
Repayments on revolving lines of credit	'	0	0	0	0
Debt issuance and other refinancing costs	0	0	0	0	0
Exercise of stock options	'	'	'	'	0
Dividends/distributions	42,500	19,600	78,000	31,971	23,400
Transactions with Parent/affiliates	-13,594	15,791	-5,158	-6,154	-6,566
Net cash provided by (used in) financing activities	28,906	35,391	72,842	25,817	16,834
Net increase (decrease) in cash and cash equivalents	0	20,608	0	0	0
Cash and cash equivalents, beginning of year	0	0	0	0	0
Cash and cash equivalents, end of year	$0	$20,608	$0	$0	$0

SUBSEQUENT_EVENT_Details

SUBSEQUENT EVENT (Details) (Senior Notes Due 2018, USD $)	Mar. 31, 2014	Feb. 07, 2014
In Millions, unless otherwise specified		Subsequent Event
Subsequent Event [Line Items]	'	'
Senior secured note face amount	$425	$425
Stated interest rate	10.75%	10.75%
Issue price (as a percent of face value)	'	106.88%