WESTMORELAND COAL (WLBAQ) 10-Q 31 Jul 14 2014 Q2 Quarterly report Financial data

Document_and_Entity_Informatio

Document and Entity Information	6 Months Ended
	Jun. 30, 2014	Jul. 29, 2014
Document Documentand Entity Information [Abstract]	'	'
Entity Registrant Name	'WESTMORELAND COAL Co	'
Entity Central Index Key	'0000106455	'
Document Type	'10-Q	'
Document Period End Date	30-Jun-14	'
Amendment Flag	'false	'
Document Fiscal Year Focus	'2014	'
Document Fiscal Period Focus	'Q2	'
Current Fiscal Year End Date	'--12-31	'
Entity Filer Category	'Accelerated Filer	'
Entity Common Stock, Shares Outstanding	'	16,986,656

Consolidated_Balance_Sheets_Un

Consolidated Balance Sheets (Unaudited) (USD $)	Jun. 30, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Current assets:	'	'
Cash and cash equivalents	$40,610	$61,110
Receivables:	'	'
Trade	129,652	66,196
Loan and lease receivable	11,682	0
Contractual third-party reclamation receivables	7,940	8,487
Other	3,182	5,086
Total receivables	152,456	79,769
Inventories	153,154	39,972
Deferred income taxes	6,053	5,355
Restricted investments and bond collateral	0	5,998
Other current assets	12,362	12,835
Total current assets	364,635	205,039
Property, plant and equipment:	'	'
Land and mineral rights	439,001	278,188
Plant and equipment	832,337	657,696
Gross property, plant and equipment	1,271,338	935,884
Less accumulated depreciation, depletion and amortization	485,820	445,848
Net property, plant and equipment	785,518	490,036
Loan and lease receivable	85,344	0
Advanced coal royalties	7,134	7,311
Reclamation deposits	75,911	74,921
Restricted investments and bond collateral	104,511	69,235
Contractual third-party reclamation receivables, less current portion	93,956	88,303
Investment in joint venture	33,273	0
Intangible assets, net of accumulated amortization of $14.9 million and $14.1 million at June 30, 2014 and December 31, 2013, respectively	677	1,520
Other assets	32,762	10,320
Total Assets	1,583,721	946,685
Current liabilities:	'	'
Current installments of long-term debt	42,401	44,343
Accounts payable and accrued expenses:	'	'
Trade	128,338	57,507
Interest payable	30,750	11,321
Production taxes	42,673	41,905
Workers' compensation	707	717
Postretirement medical benefits	13,955	13,955
SERP	390	390
Deferred revenue	11,561	14,068
Asset retirement obligations	31,131	23,353
Other current liabilities	11,973	5,469
Total current liabilities	313,879	213,028
Long-term debt, less current installments	790,643	295,494
Workers' compensation, less current portion	6,629	6,744
Excess of black lung benefit obligation over trust assets	9,841	8,675
Postretirement medical benefits, less current portion	271,773	270,374
Pension and SERP obligations, less current portion	22,222	24,176
Deferred revenue, less current portion	40,676	46,567
Asset retirement obligations, less current portion	358,253	256,511
Intangible liabilities, net of accumulated amortization of $13.0 million and $12.4 million at June 30, 2014 and December 31, 2013, respectively	5,072	5,606
Deferred income taxes	15,514	5,355
Other liabilities	9,864	2,034
Total liabilities	1,844,366	1,134,564
Shareholders' deficit:	'	'
Preferred stock of $1.00 par value Authorized 5,000,000 shares; Issued and outstanding 112,994 shares at June 30, 2014 and 159,960 at December 31, 2013	96	160
Common stock of $2.50 par value Authorized 30,000,000 shares; Issued and outstanding 15,075,153 shares at June 30, 2014 and 14,592,231 shares at December 31, 2013	38,173	36,479
Other paid-in capital	133,140	134,861
Accumulated other comprehensive loss	-53,615	-63,595
Accumulated deficit	-378,439	-295,784
Total shareholders’ deficit	-260,645	-187,879
Total Liabilities and Shareholders' Deficit	$1,583,721	$946,685

Consolidated_Balance_Sheets_Pa

Consolidated Balance Sheets (Parenthetical) (USD $)	Jun. 30, 2014	Dec. 31, 2013
In Millions, except Share data, unless otherwise specified
Statement of Financial Position [Abstract]	'	'
Intangible assets, accumulated amortization	$14.90	$14.10
Intangible liabilities, accumulated amortization	$13	$12.40
Preferred stock, par value (in USD per share)	$1	$1
Preferred stock, shares authorized	5,000,000	5,000,000
Preferred stock, shares issued	112,994	159,960
Preferred stock, shares outstanding	112,994	159,960
Common stock, par value (in USD per share)	$2.50	$2.50
Common stock, shares authorized	30,000,000	30,000,000
Common stock, shares issued	15,075,153	14,592,231
Common stock, shares outstanding	15,075,153	14,592,231

Consolidated_Statements_of_Ope

Consolidated Statements of Operations (Unaudited) (USD $)	3 Months Ended		6 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Income Statement [Abstract]	'	'	'	'
Revenues	$287,956	$162,499	$468,159	$323,947
Costs, expenses and other:	'	'	'	'
Cost of sales	248,389	130,528	387,019	260,949
Depreciation, depletion and amortization	24,479	15,397	40,538	29,823
Selling and administrative	28,709	11,969	42,040	23,855
Heritage health benefit expenses	3,388	3,109	6,932	7,060
Gain on sales of assets	-43	-74	-5	-308
Restructuring charges	7,543	0	7,941	0
Derivative loss	5,930	0	5,930	0
Income from equity affiliates	-799	0	-799	0
Other operating loss (income)	0	-10,405	151	-15,142
Total costs, expenses and other	317,596	150,524	489,747	306,237
Operating income (loss)	-29,640	11,975	-21,588	17,710
Other income (expense):	'	'	'	'
Interest expense	-21,786	-10,076	-42,584	-20,236
Loss on extinguishment of debt	-12,635	-64	-12,635	-64
Interest income	1,582	280	1,884	577
Gain (loss) on foreign exchange	2,649	0	-4,141	0
Other income	483	130	576	198
Total other income (expense)	-29,707	-9,730	-56,900	-19,525
Income (loss) before income taxes	-59,347	2,245	-78,488	-1,815
Income tax expense	3,807	28	3,697	55
Net income (loss)	-63,154	2,217	-82,185	-1,870
Less net income attributable to noncontrolling interest	0	2,499	0	797
Net loss attributable to the Parent company	-63,154	-282	-82,185	-2,667
Less preferred stock dividend requirements	209	340	470	680
Net loss applicable to common shareholders	($63,363)	($622)	($82,655)	($3,347)
Net loss per share applicable to common shareholders:	'	'	'	'
Basic and diluted (in dollars per share)	($4.19)	($0.04)	($5.52)	($0.23)
Weighted average number of common shares outstanding:	'	'	'	'
Basic and diluted (shares)	15,136	14,495	14,962	14,389

Consolidated_Statements_of_Com

Consolidated Statements of Comprehensive Income (Loss) (Unaudited) (USD $)	3 Months Ended		6 Months Ended
In Thousands, unless otherwise specified	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Statement of Comprehensive Income [Abstract]	'	'	'	'
Net income (loss)	($63,154)	$2,217	($82,185)	($1,870)
Other comprehensive income (loss):	'	'	'	'
Amortization of accumulated actuarial gains or losses, pension	359	1,004	717	1,745
Amortization of accumulated actuarial gains or losses, transition obligations, and prior service costs, postretirement medical benefit	5	1,001	10	2,002
Tax effect of other comprehensive income gains	64	0	-224	0
Change in foreign currency translation adjustment	9,477	0	9,477	0
Unrealized and realized gains and losses on available-for-sale securities	0	-39	0	-39
Other comprehensive income	9,905	1,966	9,980	3,708
Comprehensive income (loss) attributable to the Parent company	($53,249)	$4,183	($72,205)	$1,838

Consolidated_Statements_of_Sha

Consolidated Statements of Shareholders' Deficit (Unaudited) (USD $)	Total	Preferred Stock	Common Stock	Other Paid-in Capital	Accumulated Other Comprehensive Loss	Accumulated Deficit
In Thousands, except Share data
Beginning balance at Dec. 31, 2013	($187,879)	$160	$36,479	$134,861	($63,595)	($295,784)
Beginning balance, shares at Dec. 31, 2013	'	159,960	14,592,231	'	'	'
Preferred dividends declared	-470	'	'	'	'	-470
Common stock issued as compensation	2,445	'	24	2,421	'	'
Common stock options exercised, shares	'	'	9,773	'	'	'
Common stock options exercised	193	'	23	170	'	'
Common stock issued as compensation, shares	'	'	9,000	'	'	'
SARs exercised	0	'	21	-21	'	'
SARs exercised, shares	'	'	8,352	'	'	'
Conversion of convertible notes and securities	0	-64	1,097	-1,033	'	'
Conversion of convertible notes and securities, shares	'	-64,191	438,526	'	'	'
Issuance of restricted stock, shares	'	'	211,755	'	'	'
Issuance of restricted stock	-2,729	'	529	-3,258	'	'
Net income (loss)	-82,185	'	'	'	'	-82,185
Other comprehensive income	9,980	'	'	'	9,980	'
Ending balance at Jun. 30, 2014	($260,645)	$96	$38,173	$133,140	($53,615)	($378,439)
Ending balance, shares at Jun. 30, 2014	'	95,769	15,269,637	'	'	'

Consolidated_Statements_of_Cas

Consolidated Statements of Cash Flows (Unaudited) (USD $)	6 Months Ended
In Thousands, unless otherwise specified	Jun. 30, 2014	Jun. 30, 2013
Cash flows from operating activities:	'	'
Net loss	($82,185)	($1,870)
Adjustments to reconcile net loss to net cash provided by operating activities:	'	'
Depreciation, depletion and amortization	40,538	29,823
Accretion of asset retirement obligation and receivable	9,288	6,338
Non-cash tax benefits	-224	0
Amortization of intangible assets and liabilities, net	310	326
Share-based compensation	2,445	3,771
Gain on sales of assets	-5	-308
Amortization of deferred financing costs	1,209	1,856
Loss on extinguishment of debt	12,635	64
Loss (gain) on sales of investment securities	3	-28
Derivative loss	5,930	0
Loss on foreign exchange	4,141	0
Income from equity affiliates	-799	0
Distributions from equity affiliates	730	0
Changes in operating assets and liabilities:	'	'
Receivables, net	-11,270	3,687
Inventories	22,770	-1,977
Excess of black lung benefit obligation over trust assets	1,166	-281
Deferred income tax	3,854	0
Accounts payable and accrued expenses	8,538	1,701
Deferred revenue	-8,424	-6,214
Income tax payable	528	-56
Accrual for workers' compensation	-125	-284
Asset retirement obligation	-3,362	-5,424
Accrual for postretirement medical benefits	1,409	4,094
Pension and SERP obligations	-332	1,517
Other assets and liabilities	1,805	-1,811
Net cash provided by operating activities	10,573	34,924
Cash flows from investing activities:	'	'
Additions to property, plant and equipment	-17,361	-13,467
Change in restricted investments and bond collateral and reclamation deposits	-30,517	-8,714
Cash payments related to Canadian acquisition	-322,637	0
Cash acquired in related to Canadian acquisition	8,103	0
Net proceeds from sales of assets	213	577
Proceeds from sale of restricted investments	246	6,807
Increase in loan and lease receivable	-1,120	0
Receipts from loan and lease receivable	2,164	0
Receivable from customer for property and equipment purchases	0	-308
Other	-82	0
Net cash used in investing activities	-360,991	-15,105
Cash flows from financing activities:	'	'
Change in book overdrafts	1,605	1,777
Borrowings from long-term debt, net of debt discount	454,219	0
Repayments of long-term debt	-97,538	-16,070
Borrowings on revolving lines of credit	10,000	6,000
Repayments of revolving lines of credit	-10,000	-6,000
Debt issuance costs and other refinancing costs	-27,053	-182
Preferred dividends paid	-470	-680
Exercise of stock options	193	0
Net cash provided by (used in) financing activities	330,956	-15,155
Effect of foreign exchange rates on cash	-1,038	0
Net increase in cash and cash equivalents	-20,500	4,664
Cash and cash equivalents, beginning of period	61,110	31,610
Cash and cash equivalents, end of period	$40,610	$36,274

BASIS_OF_PRESENTATION

BASIS OF PRESENTATION	6 Months Ended
	Jun. 30, 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 are conducted within the United States and Canada. U.S. activities include 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. Canadian activities include the production and sale of coal from six surface mines in Alberta and Saskatchewan, selling char to the barbecue briquette industry, and a 50% interest in a joint venture which produces activated carbon for the removal of flue gas. The Company’s activities are primarily conducted through wholly owned subsidiaries. All intercompany transactions and accounts have been eliminated in consolidation.
	U.S. Operations – 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.
	Canadian Operations – Prairie Mines & Royalty ULC, or PMRU, operates five surface coal mines in Alberta and Saskatchewan. PMRU owns and operates the Paintearth, Sheerness, Genesee, Poplar River and Estevan mines. PMRU directly owns a 50% joint venture interest in the Bienfait Activated Carbon Joint Venture, at the Estevan mine, which produces activated carbon for the removal of mercury from flue gas. PMRU also sells char to the barbecue briquette industry. Coal Valley Resources Inc., or CVRI, operates the Coal Valley Mine which is a surface mine located in West Central Alberta where the majority of coal is exported overseas to Asian utility companies and commodity traders. CVRI operated the Obed Mountain surface mine, which ceased production in 2013 and is currently in reclamation.
	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 six months ended June 30, 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.
	Debt Obligations
	The Company is subject to one major debt arrangement of $675.5 million in aggregate principal amount of 10.75% senior secured notes at the Parent level that are collateralized by substantially all of the assets of the Company.
	Business Interruption Insurance
	The Company received business interruption insurance proceeds for the six months ended June 30, 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 $11.3 million of income for the six months ended June 30, 2014 and 2013, respectively. The Company received $4.6 million of cash proceeds for the six months ended June 30, 2014 related to income recorded in 2013. Insurance proceeds are included in Net cash provided by operating activities. As of June 30, 2014, the Company has collected all cash proceeds related to income recognized.
	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, depreciation, depletion, amortization, operating overhead and other related costs.
	Derivatives
	The Company enters into financial derivatives to manage exposure to fluctuations in foreign currency exchange rates and power prices. The Company does not utilize derivative financial instruments for trading purposes or for speculative purposes.
	The Company’s derivative instruments are recorded at fair value with changes in fair value recognized in the Consolidated Statements of Operations at the end of each period in Gain (loss) on foreign exchange or Derivative loss.
	Equity-Method Investments
	The Company's 50% interest in the Bienfait Activated Carbon Joint Venture is accounted for under the equity method of accounting. Investments in unconsolidated affiliates that the Company has the ability to exercise significant influence over, but not control, are accounted for under the equity method of accounting. Under the equity method of accounting, the Company records its proportionate share of the entity’s net income or loss at each reporting period in Income from equity affiliates on the Consolidated Statements of Operations with a corresponding entry to increase or decrease the carrying value of the investment.
	Loan and Lease Receivable
	The Company periodically makes loans and finance leases at the Genesee mine in accordance with its operating agreement with its only customer for purposes of funding capital expenditures and working capital requirements. Finance lease and loan receivables are measured at the present value of the future lease payments at the inception of the arrangement. Lease payments received are comprised of a repayment of principal and finance income. Finance income is recognized based on the interest rate implicit in the finance lease. PMRU recognizes finance income over periods between 3 and 27 years, which reflect a constant periodic return on its net investment in the finance lease. Initial direct costs are included in the initial measurement of the finance lease receivable and reduce the amount of income recognized over the lease term.
	Income Taxes
	The Company’s effective tax rate in the six months ended June 30, 2014, was lower than the effective tax rate in the six months ended June 30, 2013, primarily due to the forecasted 2014 decrease in pre-tax loss and the related income tax expense from the Canadian Acquisition.
	For the six months ended June 30, 2014, the Company’s effective tax rate differs from the statutory rate primarily due to the U.S. valuation allowance and foreign operations. For the six months ended June 30, 2013, the Company’s effective tax rate differs from the statutory rate primarily due to the U.S. valuation allowance.
	The Company has recorded a $5.8 million liability for unrecognized tax benefits at June 30, 2014 with no liability recorded at December 31, 2013. This liability relates to the utilization of prior losses and is currently under review by taxing authorities. It is reasonably possible that the liability for unrecognized tax benefits will significantly change in the next twelve months upon the taxing authorities concluding the review.
	Foreign Currency Translation
	The functional currency of the Company’s Canadian operations is the Canadian dollar. The Company’s Canadian operations’ assets and liabilities are translated at period end exchange rates, and revenues and costs are translated using average exchange rates for the period. Foreign currency translation adjustments are reported in Other comprehensive income.
	Reclassifications
	Certain amounts in prior periods have been reclassified to conform with the presentation of 2014, with no effect on
	previously reported net loss, cash flows or shareholders’ deficit. The reclassification affected current assets, current liabilities and noncurrent liabilities on the Consolidated Balance Sheet.
	Recently Adopted Accounting Pronouncements
	In May 2014, the Financial Accounting Standards Board (FASB) issued Accounting Standards Update (ASU) 2014-09, Revenue from Contracts with Customers, issued as a new Topic, Accounting Standards Codification (ASC) Topic 606. The new revenue recognition standard provides a five-step analysis of transactions to determine when and how revenue is recognized. The core principle of the guidance is that a company should recognize revenue to depict the transfer of promised goods or services to customers in an amount that reflects the consideration to which the entity expects to be entitled in exchange for those goods or services. This ASU is effective beginning in fiscal 2017 and can be adopted by the Company either retrospectively or as a cumulative-effect adjustment as of the date of adoption. The Company is currently evaluating the effect that adopting this new accounting guidance will have on its consolidated results of operations, cash flows and financial position.

ACQUISITION_ACQUISITION

ACQUISITION ACQUISITION	6 Months Ended
	Jun. 30, 2014
Business Combinations [Abstract]	'
ACQUISITION	'
	ACQUISITION
	On December 24, 2013, the Company entered into an agreement to acquire Sherritt International Corporation’s Prairie and Mountain coal mining operations, collectively referred to as the Canadian Acquisition. On April 28, 2014, Westmoreland Coal Company consummated the Canadian Acquisition. These operations, referred to as the Canadian operations, include six producing thermal coal mines in the Canadian provinces of Alberta and Saskatchewan, a char production facility, and a 50% interest in an activated carbon plant. The Canadian properties include approximately 649 million tons of total proven or probable coal reserves as of December 31, 2013. The purchase consideration included a $282.8 million initial cash payment made on April 28, 2014, a cash payment for a working capital adjustment of $39.8 million made on June 25, 2014, and assumed liabilities of $330.5 million.
	In connection with the Canadian Acquisition: (i) proceeds from a private offering of $425.0 million in aggregate principal amount of 10.75% senior secured notes, or the New Notes, were released from escrow and such notes were automatically exchanged for identical notes issued by Westmoreland and Westmoreland Partners, as co-issuers; (ii) Westmoreland increased its revolving line of credit to $60.0 million; and (iii) Westmoreland Mining LLC, or WML; a wholly owned subsidiary of Westmoreland, provided prepayment notices to holders of its 8.02% senior secured notes due 2018, which notes were prepaid at the end of May 2014. Acquisition related costs of $31.6 million have been expensed for the six months ended June 30, 2014; which includes a $13.6 million charge to cost of sales related to the sale of inventory written up to fair value in the acquisition, $6.9 million of expenses included in Selling and administrative costs, $6.2 million of loss on foreign exchange as described in Note 10, and $4.9 million included in Interest expense related to a bridge facility commitment fee.
	The Canadian 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 allocation of the purchase price is preliminary pending the completion of various analyses and the finalization of estimates. During the measurement period (which is not to exceed one year from the acquisition date), additional assets or liabilities may be recognized if new information is obtained about facts and circumstances that existed as of the acquisition date that, if known, would have resulted in the recognition of those assets or liabilities as of that date. The preliminary allocation may be adjusted after obtaining additional information regarding, among other things, asset valuations, liabilities assumed and revisions of previous estimates. These adjustments may be significant and will be accounted for retrospectively.
	A summary of the purchase consideration and a preliminary allocation of the purchase consideration follows (in millions):
	Purchase Price:
	Cash paid - Initial payment	$	282.8
	Cash paid - Working capital adjustment	39.8
	Total cash consideration	$	322.6
	Preliminary allocation of purchase price:
	Assets:
	Cash and cash equivalents	$	26.2
	Trade receivables	49.9
	Inventories - materials and supplies	52
	Inventories - coal	79.8
	Leases and loans receivable	11.2
	Deferred tax assets	6.7
	Other current assets	3.4
	Total current assets	229.2
	Land and mineral rights	151.3
	Plant and equipment	171.7
	Leases and loans receivable	83.8
	Contractual third-party reclamation receivables, less current portion	6.8
	Other assets	10.3
	Total Assets	653.1
	Liabilities:
	Current installments of long-term debt	(36.3		)
	Trade payables and other accrued liabilities	(93.7		)
	Asset retirement obligations	(9.7		)
	Total current liabilities	(139.7		)
	Long-term debt, less current installments	(86.3		)
	Asset retirement obligations, less current portion	(92.4		)
	Deferred tax liabilities	(12.1		)
	Total Liabilities	(330.5		)
	Net fair value	$	322.6
	The $26.2 million of cash and cash equivalents noted above includes $18.1 million which was used for immediate payment of an assumed liability on the acquisition date, leaving $8.1 million of net cash received upon the acquisition.
	The results of operations of the Canadian operations from the acquisition date of April 28, 2014 have been included in the Company's consolidated results of operations for the three and six months ended June 30, 2014. The Canadian operations generated $116.0 million of revenue and $12.7 millionof operating loss since the April 28, 2014 acquisition date.
	The following unaudited pro forma information has been prepared for illustrative purposes only and assumes the acquisition occurred on January 1, 2013. 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, 2013, or of future results of operations.
		Three Months Ended June 30,						Six Months Ended June 30,
		2014			2013			2014			2013
	Total Revenues	(In thousands, except per share data)
	As reported	$	287,956		$	162,499		$	468,159		$	323,947
	Pro forma	$	320,761		$	356,962		$	674,378		$	672,735
	Operating Income
	As reported	$	(29,640	)	$	11,975		$	(21,588	)	$	17,710
	Pro forma	$	(50,032	)	$	17,081		$	(14,433	)	$	30,105
	Net loss applicable to common shareholders
	As reported	$	(63,363	)	$	(622	)	$	(82,655	)	$	(3,347	)
	Pro forma	$	(89,247	)	$	(4,167	)	$	(97,509	)	$	(9,131	)
	Net loss per share applicable to common shareholders
	As reported	$	(4.19	)	$	(0.04	)	$	(5.52	)	$	(0.23	)
	Pro forma	$	(5.90	)	$	(0.29	)	$	(6.52	)	$	(0.63	)

INVENTORIES

INVENTORIES	6 Months Ended
	Jun. 30, 2014
Inventory Disclosure [Abstract]	'
INVENTORIES	'
	INVENTORIES
	Inventories consisted of the following:
		June 30, 2014			December 31, 2013
		(In thousands)
	Coal stockpiles	$	61,663		$	543
	Coal fuel inventories	5,319			6,161
	Materials and supplies	86,946			34,233
	Reserve for obsolete inventory	(774		)	(965		)
	Total	$	153,154		$	39,972

RESTRICTED_INVESTMENTS_AND_BON

RESTRICTED INVESTMENTS AND BOND COLLATERAL	6 Months Ended
	Jun. 30, 2014
Disclosure Restricted Investments and Bond Collateral [Abstract]	'
RESTRICTED INVESTMENTS AND BOND COLLATERAL	'
	RESTRICTED INVESTMENTS AND BOND COLLATERAL
	The Company’s restricted investments and bond collateral consist of the following:
		June 30, 2014			31-Dec-13
		(In thousands)
	Coal - U.S. Segment:
	WML debt reserve account	$	—		$	13,067
	Reclamation bond collateral:
	Kemmerer Mine	25,077			24,966
	Absaloka Mine	11,696			11,653
	Rosebud Mine	3,145			3,145
	Beulah Mine	1,270			1,270
	Coal - Canada Segment:
	PMRU	16,201			—
	CVRI	31,867			—
	Power Segment:
	Letter of credit account	—			5,998
	Corporate Segment:
	Postretirement medical benefit bonds	8,550			8,467
	Workers’ compensation bonds	6,705			6,667
	Total restricted investments and bond collateral	104,511			75,233
	Less current portion	—			(5,998		)
	Total restricted investments and bond collateral, less current portion	$	104,511		$	69,235
	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.
	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.
	The Company’s carrying value and estimated fair value of its restricted investments and bond collateral at June 30, 2014 are as follows:
		Carrying Value			Fair Value
		(In thousands)
	Cash and cash equivalents	$	67,340		$	67,340
	Time deposits	2,451			2,451
	Held-to-maturity securities	34,720			35,259
		$	104,511		$	105,050
	Held-to-Maturity Restricted Investments and Bond Collateral
	The amortized cost, gross unrealized holding gains and fair value of held-to-maturity securities at June 30, 2014 is as follows (in thousands):
	Amortized cost	$	34,720
	Gross unrealized holding gains	628
	Gross unrealized holding losses	(89		)
	Fair value	$	35,259
	Maturities of held-to-maturity securities are as follows at June 30, 2014:
		Amortized Cost			Fair Value
		(In thousands)
	Due within one year	$	1,212		$	1,230
	Due in five years or less	19,360			19,704
	Due after five years to ten years	8,897			9,070
	Due in more than ten years	5,251			5,255
		$	34,720		$	35,259
	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.
	As of February 2014, the Company is no longer required to fund a letter of credit account for its power operations.

RESTRUCTURING_CHARGES

RESTRUCTURING CHARGES	6 Months Ended
	Jun. 30, 2014
Restructuring and Related Activities [Abstract]	'
RESTRUCTURING CHARGES	'
	RESTRUCTURING CHARGES
	In 2013, the Company entered into an agreement with Dominion Virginia Power, a subsidiary of Dominion, to restructure the remaining 5 years of the ROVA contract. The Company recorded a restructuring charge for additional contractual obligations of $0.1 million and $0.5 million for the three and six months ended June 30, 2014, respectively. The Company expects that the $5.1 million of accruals will be paid out by the end of 2014.
	The table below represents the restructuring provision activity related to the ROVA restructuring affecting our Power segment during the six months ended June 30, 2014 (in millions):
	Beginning Balance		Restructuring Charges		Restructuring Payments		Ending Balance
	$	5.1	$	0.5	$	0.5	$	5.1
	During the second quarter of 2014, the Company initiated strategic changes related to the Canadian Acquisition. The restructuring actions are expected to be completed in 2014. The Company recorded a restructuring charge for one-time employee termination benefits of $8.0 million for the three and six months ended June 30, 2014 and expects that accruals will be paid through 2016.
	The table below represents the restructuring provision activity related to the Canadian Acquisition affecting our Coal - Canada and Coal - US segments during the six months ended June 30, 2014 (in millions):
	Beginning Balance		Restructuring Charges		Restructuring Payments		Ending Balance
	$	—	$	8	$	0.4	$	7.6

LINES_OF_CREDIT_AND_LONGTERM_D

LINES OF CREDIT AND LONG-TERM DEBT	6 Months Ended
	Jun. 30, 2014
Debt Disclosure [Abstract]	'
LINES OF CREDIT AND LONG-TERM DEBT	'
	LINES OF CREDIT AND DEBT
	The amounts outstanding under the Company’s debt consisted of the following as of the dates indicated:
		Total Debt Outstanding
		June 30, 2014			December 31, 2013
		(In thousands)
	10.75% Senior Notes due 2018	$	250,485		$	251,500
	Add-On Notes - 10.75% senior notes due 2018	425,000			—
	8.02% WML term debt due 2018	—			85,500
	Capital lease obligations	133,240			10,153
	Other	5,286			1,209
	Debt premium (discount), net	19,033			(8,525		)
	Total debt outstanding	833,044			339,837
	Less current installments	(42,401		)	(44,343		)
	Total debt outstanding, less current installments	$	790,643		$	295,494
	The following table presents aggregate contractual debt maturities of all debt:
		As of June 30, 2014
		(In thousands)
	2014	$	22,270
	2015	41,290
	2016	39,318
	2017	25,776
	2018	682,852
	Thereafter	2,505
	Total	814,011
	Plus: debt premium (discount), net	19,033
	Total debt	$	833,044
	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 were $454.2 million, which included $29.2 million of debt premium. The net proceeds of the offering of the New Notes were used to finance the $282.8 million initial cash payment for the Canadian Acquisition and cash transaction costs associated with the Canadian Acquisition and offering of the New Notes of approximately $24.0 million. The remaining balance of the proceeds were used to fund the prepayment of the WML Notes and for other general corporate purposes. In connection with the WML prepayment, the WML revolving credit facility was terminated. Upon the prepayment of the WML Notes, WML's assets constitute collateral for the senior notes.
	Promptly following the completion of the Canadian Acquisition, the Company exchanged the New Notes for $425 million aggregate principal amount of add-on 10.75% senior secured notes due 2018, referred to as the Add-On Notes, and the Company became party to a registration rights agreement, pursuant to which the Company agreed 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. The Company will pay interest on the Add-On Notes semi-annually on February 1st and August 1st of each year beginning on August 1, 2014.
	The Company amended its existing corporate revolving credit agreement to increase the maximum available borrowing amount to $60 million, The revolver may support up to $60 million of letters of credit, which would reduce the balance available under the revolver.
	The Company capitalized debt issuance costs of $15.4 million during the six months ended June 30, 2014 related to the new senior notes and the amendment of its revolver.
	During the six months ended June 30, 2014, the Company paid $1.0 million, excluding accrued interest, to repurchase Senior Notes with a principal amount of $1.0 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. The Company had $29.5 million of Excess Cash Flow for the year ended December 31, 2013 and offered $22.1 million for repurchase during the second quarter of 2014. As of December 31, 2013, the Company had classified $22.1 million of the outstanding 10.75% Senior Notes to Current installments of long-term debt related to the required Excess Cash Flow offering. The Excess Cash Flow offer expired by June 30, 2014 with $1.0 million of principal being repaid. The remaining $21.1 million was reclassified to Long-term debt, less current installments as of June 30, 2014.
	During the six months ended June 30, 2014, the Company entered into $12.9 million of new capital leases at its Kemmerer Mine.
	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.

POSTRETIREMENT_MEDICAL_BENEFIT

POSTRETIREMENT MEDICAL BENEFITS AND PENSION	6 Months Ended
	Jun. 30, 2014
Compensation and Retirement Disclosure [Abstract]	'
POSTRETIREMENT MEDICAL BENEFITS AND PENSION	'
	POSTRETIREMENT MEDICAL BENEFITS AND PENSION
	Postretirement Medical Benefits
	The Company provides postretirement medical benefits to retired employees and their dependents as mandated by the Coal Industry Retiree Health Benefit Act of 1992 and pursuant to collective bargaining agreements. The Company also provides these benefits to qualified full-time employees pursuant to collective bargaining agreements.
	The components of net periodic postretirement medical benefit cost are as follows:
		Three Months Ended June 30,						Six Months Ended June 30,
		2014			2013			2014			2013
		(In thousands)						(In thousands)
	Components of net periodic benefit cost:
	Service cost	$	822		$	1,109		$	1,645		$	2,218
	Interest cost	3,203			3,035			6,407			6,069
	Amortization of deferred items	4			1,001			9			2,003
	Total net periodic benefit cost	$	4,029		$	5,145		$	8,061		$	10,290
	The following table shows the net periodic postretirement medical benefit costs that relate to current and former mining operations:
		Three Months Ended June 30,						Six Months Ended June 30,
		2014			2013			2014			2013
		(In thousands)						(In thousands)
	Former mining operations	$	2,402		$	3,119		$	4,807		$	6,237
	Current operations	1,627			2,026			3,254			4,053
	Total net periodic benefit cost	$	4,029		$	5,145		$	8,061		$	10,290
	The costs for the former mining operations are included in Heritage health benefit expenses and costs for current operations are included in Cost of sales and Selling and administrative expenses.
	Pension
	The Company provides pension benefits to qualified full-time employees pursuant to collective bargaining agreements.
	The Company incurred net periodic benefit costs of providing these pension benefits as follows:
		Three Months Ended June 30,						Six Months Ended June 30,
		2014			2013			2014			2013
		(In thousands)						(In thousands)
	Components of net periodic benefit cost:
	Service cost	$	500		$	638		$	1,000		$	1,173
	Interest cost	1,638			1,555			3,384			3,180
	Expected return on plan assets	(2,154		)	(2,325		)	(4,307		)	(4,385		)
	Amortization of deferred items	359			1,004			719			1,745
	Total net periodic pension cost	$	343		$	872		$	796		$	1,713
	These costs are included in Cost of sales and Selling and administrative expenses.
	The Company contributed $1.1 million of cash contributions to its pension plans in the six months ended June 30, 2014 and expects to make $3.2 million of pension plan contributions during the remainder of 2014.

HERITAGE_HEALTH_BENEFIT_EXPENS

HERITAGE HEALTH BENEFIT EXPENSES	6 Months Ended
	Jun. 30, 2014
Heritage Health Benefit Expenses [Abstract]	'
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:
		Three Months Ended June 30,					Six Months Ended June 30,
		2014		2013			2014		2013
		(In thousands)					(In thousands)
	Health care benefits	$	2,376	$	3,089		$	4,650	$	6,266
	Combined benefit fund payments	512		576			1,025		1,152
	Workers’ compensation benefits	124		117			260		232
	Black lung benefits	376		(673		)	997		(590		)
	Total	$	3,388	$	3,109		$	6,932	$	7,060

ASSET_RETIREMENT_OBLIGATIONS_C

ASSET RETIREMENT OBLIGATIONS, CONTRACTUAL THIRD-PARTY RECLAMATION RECEIVABLES, AND RECLAMATION DEPOSITS	6 Months Ended
	Jun. 30, 2014
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
	The asset retirement obligation, contractual third-party reclamation receivable, and reclamation deposits for each of the Company’s operating segments at June 30, 2014 are summarized below:
		Asset			Contractual			Reclamation
		Retirement			Third-Party			Deposits
		Obligation			Reclamation
					Receivable
		(In thousands)
	Coal - U.S.	$	281,346		$	95,157		$	75,911
	Coal - Canada	107,111			6,739			—
	Power	927			—			—
	Total	$	389,384		$	101,896		$	75,911
	Asset Retirement Obligations
	Changes in the Company’s asset retirement obligations were as follows:
		Six Months Ended June 30,
		2014			2013
		(In thousands)
	Asset retirement obligations, beginning of year (including current portion)	$	279,864		$	263,847
	Accretion	14,003			10,951
	Liabilities settled	(10,250		)	(11,647		)
	ARO acquired	102,075			—
	Changes due to foreign currency translation	3,692			—
	Asset retirement obligations, end of period	389,384			263,151
	Less current portion	(31,131		)	(24,105		)
	Asset retirement obligations, less current portion	$	358,253		$	239,046
	Contractual Third-Party Reclamation Receivables
	At June 30, 2014, the Company has recognized as an asset of $101.9 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.
	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 June 30, 2014 are as follows:
		Carrying Value			Fair Value			Fair Value Hierarchy
		(In thousands)
	Cash and cash equivalents	$	44,089		$	44,089		Level 1
	Held-to-maturity securities	31,822			32,601			Level 2
		$	75,911		$	76,690
	Held-to-Maturity Reclamation Deposits
	The amortized cost, gross unrealized holding gains and losses and fair value of held-to-maturity securities at June 30, 2014 are as follows (in thousands):
	Amortized cost	$	31,822
	Gross unrealized holding gains	953
	Gross unrealized holding losses	(174		)
	Fair value	$	32,601
	Maturities of held-to-maturity securities are as follows at June 30, 2014:
		Amortized Cost			Fair Value
		(In thousands)
	Within one year	$	1,025		$	998
	Due in five years or less	17,341			17,829
	Due after five years to ten years	7,289			7,424
	Due in more than ten years	6,167			6,350
		$	31,822		$	32,601
	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.

DERIVATIVE_INSTRUMENTS

DERIVATIVE INSTRUMENTS	6 Months Ended
	Jun. 30, 2014
Derivative Instruments and Hedging Activities Disclosure [Abstract]	'
DERIVATIVE INSTRUMENTS	'
	DERIVATIVE INSTRUMENTS
	Derivative Assets and Liabilities
	The Company evaluates all of its financial instruments to determine if such instruments are derivatives, derivatives that qualify for the normal purchase normal sale exception, or contain features that qualify as embedded derivatives. All derivative financial instruments, except for derivatives that qualify for the normal purchase normal sale exception, are recognized on the balance sheet at fair value. Changes in fair value are recognized in earnings if they are not eligible for hedge accounting or in other comprehensive income if they qualify for cash flow hedge accounting.
	In the first quarter of 2014, the Company entered into two foreign currency exchange forward contracts to purchase Canadian Dollars to manage a portion of its exposure to fluctuating rates of exchange on anticipated Canadian Dollar-denominated Canadian Acquisition cash flows. These two foreign currency contracts had a total notional amount of $348.3 million and were settled in April 2014.
	During 2014, the Company entered into contracts to purchase power at its ROVA facility to manage exposure to power price fluctuations. These contracts cover the period from April 2014 to December 2018 and contracted power prices range from $41.05 to $44.09 megawatts per hour. The fair value of these power price derivatives are based on comparing contracted prices to projected future prices.
	The fair value of outstanding derivative instruments not designated as hedging instruments on the accompanying Consolidated Balance Sheet was as follows (in thousands):
	Derivative Instruments	Balance Sheet Location	June 30, 2014
	Contracts to purchase power	Other current liabilities	$	140
	Contracts to purchase power	Other liabilities	5,790
	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 June 30, 2014			Six Months Ended June 30, 2014
		Operations Location
	Canadian dollar foreign exchange forward contracts	Gain (loss) on foreign exchange	$	581		$	(6,209	)
	Contracts to purchase power	Derivative loss	(5,930		)	(5,930		)

FAIR_VALUE_MEASUREMENTS

FAIR VALUE MEASUREMENTS	6 Months Ended
	Jun. 30, 2014
Fair Value Disclosures [Abstract]	'
FAIR VALUE MEASUREMENTS	'
	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 4, 9 and 10 for additional disclosures related to fair value measurements.
	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.
	•	Level 1, defined as observable inputs such as quoted prices in active markets for identical assets.
	•	Level 2, defined as observable inputs other than Level 1 prices. These include quoted prices for similar assets or liabilities in an active market, quoted prices for identical assets and liabilities in markets that are not active, or other inputs that are observable or can be corroborated by observable market data for substantially the full term of the assets or liabilities.
	•	Level 3, defined as unobservable inputs in which little or no market data exists, therefore requiring an entity to develop its own assumptions.
	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 June 30, 2014 (Level 3). The estimated fair values of the Company’s debt with fixed interest rates are as follows:
		Carrying Value		Fair Value
		(In thousands)
	31-Dec-13	$	328,473	$	364,329
	June 30, 2014	$	694,515	$	726,146
	The Company uses derivative financial instruments, primarily foreign exchange contracts and forward contracts to purchase power, to reduce its exposure to market risks from changes in foreign exchange rates and changes in prices for power, respectively. The foreign exchange contracts are measured at fair value using quoted forward foreign exchange prices from counterparties corroborated by market-based pricing (Level 2). The contracts to purchase power are measured at fair value using forward pricing curves for power from counterparties corroborated by market-based pricing (Level 2). Additional information related to the Company’s derivative financial instruments is disclosed in Notes 1 and 10 to the consolidated financial statements.
	The Company’s non-recurring fair value measurements include asset retirement obligations (refer to Note 9).
	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.
	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.

SHAREHOLDERS_EQUITY_AND_ACCUMU

SHAREHOLDERS' EQUITY AND ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS)	6 Months Ended
	Jun. 30, 2014
Stockholders' Equity Note [Abstract]	'
SHAREHOLDERS' EQUITY AND ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS)	'
	SHAREHOLDERS’ EQUITY AND ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS)
	Preferred Stock
	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 $0.5 million of preferred stock dividends for the six months ended June 30, 2014. During the three months ended June 30, 2014, approximately 25,454 shares of preferred stock were converted into 173,885 shares of common stock. Subsequent to June 30, 2014 and through July 29, 2014, approximately 3,825 shares of preferred stock were converted into 26,133 shares of common stock.
	Changes in Accumulated Other Comprehensive Income (Loss)
	The following table reflects the changes in accumulated other comprehensive income (loss) by component:
		Pension				Postretirement				Foreign currency translation adjustment		Tax effect of			Accumulated
						medical benefits						other			other
												comprehensive			comprehensive
												income gains			loss
		(In thousands)
	Balance at December 31, 2013	$	(12,255	)		$	(20,292	)		$	—	$	(31,048	)	$	(63,595	)
	Other comprehensive income (loss) before reclassifications	—				—				9,477		(224		)	9,253
	Amounts reclassified from accumulated other comprehensive income (loss)	717				10				—		—			727
	Balance at June 30, 2014	$	(11,538	)		$	(20,282	)		$	9,477	$	(31,272	)	$	(53,615	)
	The following table reflects the reclassifications out of accumulated other comprehensive loss for the six months ended June 30, 2014 are as follows (in thousands):
	Details about accumulated other comprehensive loss components		Amount reclassified from accumulated								Affected line item
			other comprehensive loss1								in the statement
											where net income
			Three Months Ended June 30, 2014				Six Months Ended June 30, 2014				(loss) is presented
	Amortization of defined benefit pension items
	Actuarial losses		$	359			$	717			2
	Amortization of postretirement medical items
	Prior service costs		$	(159	)		$	(318	)		3
	Actuarial losses		164				328				3
	Total		$	5			$	10
	____________________
	-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 7 - Pension for additional details)
	-3	These accumulated other comprehensive loss components are included in the computation of net periodic postretirement medical cost. (See Note 7 - Postretirement Medical Benefits for additional details)
	Equity Offering
	Subsequent to June 30, 2014, the Company completed a public offering of 1,684,507 shares of common stock at $35.50 per share for gross proceeds of $59.8 million. The Company intends to use the net proceeds of the offering to increase its overall financial flexibility, pursue organic and acquisition growth strategies and for general corporate purposes.

SHAREBASED_COMPENSATION

SHARE-BASED COMPENSATION	6 Months Ended
	Jun. 30, 2014
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]	'
SHARE-BASED COMPENSATION	'
	SHARE-BASED COMPENSATION
	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 with a value of $90,000 after each annual meeting.
	In June 2014, the Company began contributing Company stock to its 401(k) plan instead of cash.
	The Company recognized compensation expense from share-based arrangements shown in the following table:
		Three Months Ended June 30,						Six Months Ended June 30,
		2014			2013			2014				2013
		(In thousands)
	Recognition of fair value of restricted stock units, stock options and SARs over vesting period; and issuance of stock	$	1,388		$	597		$	2,116			$	2,260
	Contributions of stock to the Company's 401(k) plan	329			788			329				1,511
	Total share-based compensation expense	$	1,717		$	1,385		$	2,445			$	3,771
	Restricted Stock Units
	A summary of restricted stock award activity for the six months ended June 30, 2014 is as follows:
		Units		Weighted			Unamortized
				Average			Compensation
				Grant-Date			Expense
				Fair Value			(In thousands)
	Non-vested at December 31, 2013	588,727		$	9.37
	Granted	214,188		—
	Vested	(299,872	)	—
	Non-vested at June 30, 2014	503,043		$	8.64		$	5,605		(1)
	____________________
	-1	Expected to be recognized over the next three years.
	Stock Options
	A summary of stock option activity for the six months ended June 30, 2014 is as follows:
		Stock Options		Weighted			Weighted			Aggregate Intrinsic				Unamortized
				Average			Average			Value				Compensation
				Exercise Price			Remaining			(In thousands)				Expense
							Contractual							(In thousands)
							Life
							(In years)
	Outstanding at December 31, 2013	145,806		$	21.97
	Exercised	(9,000	)	$	21.4
	Expired	—		$	—
	Outstanding and exercisable at June 30, 2014	136,806		$	22.01		3.7			$	1,953			$	—
	There were no stock options granted during the six months ended June 30, 2014.
	SARs
	A summary of SARs activity for the six months ended June 30, 2014 is as follows:
		SARs		Weighted			Weighted		Aggregate Intrinsic				Unamortized
				Average Exercise Price			Average		Value				Compensation
							Remaining		(In thousands)				Expense
							Contractual						(In thousands)
							Life
							(In years)
	Outstanding at December 31, 2013	70,734		$	22.6
	Exercised	(36,291	)	$	21.3
	Expired	—		$	—
	Outstanding and exercisable at June 30, 2014	34,443		$	23.97		1.7		$	424			$	—
	There were no SARs granted during the six months ended June 30, 2014.

EARNINGS_PER_SHARE

EARNINGS PER SHARE	6 Months Ended
	Jun. 30, 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 six months ended June 30, 2014 and June 30, 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 June 30,				Six Months Ended June 30,
		2014		2013		2014		2013
		(In thousands)
	Convertible securities	$	654	$	1,093	$	654	$	1,093
	Restricted stock units, stock options and SARs	674		862		674		862
	Total shares excluded from diluted shares calculation	$	1,328	$	1,955	$	1,328	$	1,955

BUSINESS_SEGMENT_INFORMATION

BUSINESS SEGMENT INFORMATION	6 Months Ended
	Jun. 30, 2014
Segment Reporting [Abstract]	'
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.
	The Company’s operations are classified into five reporting segments: Coal - U.S., Coal - Canada, Power, Heritage and Corporate. The Canadian Acquisition was completed on April 28, 2014 and the segment "Coal - Canada" has not been previously presented. The business segment information for the Company's U.S. coal operations was previously reported in the "Coal" segment in the 2013 Form 10-K since the Company previously only held coal operations in the U.S.
	Summarized financial information by segment is as follows:
		Coal - U.S.			Coal - Canada(1)			Power			Heritage			Corporate			Consolidated
		(In thousands)
	Three Months Ended June 30, 2014
	Revenues	$	150,107		$	116,046		$	21,803		$	—		$	—		$	287,956
	Restructuring charges	491			6,646			101			—			305			7,543
	Depreciation, depletion, and amortization	13,283			8,671			2,486			—			39			24,479
	Operating income (loss)	(423		)	(12,709		)	(9,473		)	(3,559		)	(3,476		)	(29,640		)
	Total assets	670,375			687,185			165,763			15,664			44,734			1,583,721
	Capital expenditures	6,533			7,495			220			—			63			14,311
	Three Months Ended June 30, 2013
	Revenues	$	139,337		$	—		$	23,162		$	—		$	—		$	162,499
	Depreciation, depletion, and amortization	12,804			—			2,551			—			42			15,397
	Operating income (loss)	12,572			—			4,837			(3,530		)	(1,904		)	11,975
	Total assets	699,556			—			183,855			16,305			33,887			933,603
	Capital expenditures	7,209			—			564			—			393			8,166
	Six Months Ended June 30, 2014
	Revenues	$	308,298		$	116,046		$	43,815		$	—		$	—		$	468,159
	Restructuring charges	491			6,646			499			—			305			7,941
	Depreciation, depletion, and amortization	26,780			8,671			5,009			—			78			40,538
	Operating income (loss)	12,275			(12,709		)	(7,731		)	(7,389		)	(6,034		)	(21,588		)
	Total assets	670,375			687,185			165,763			15,664			44,734			1,583,721
	Capital expenditures	9,586			7,495			255			—			25			17,361
	Six Months Ended June 30, 2013
	Revenues	$	281,449		$	—		$	42,498		$	—		$	—		$	323,947
	Depreciation, depletion, and amortization	24,658			—			5,081			—			84			29,823
	Operating income (loss)	25,566			—			3,836			(7,705		)	(3,987		)	17,710
	Total assets	699,556			—			183,855			16,305			33,887			933,603
	Capital expenditures	12,219			—			698			—			550			13,467
	____________________
	-1	The Canadian operations were acquired on April 28, 2014, therefore, information for the three and six months ended June 30, 2014 includes approximately two months of operations and there is no activity for 2013.
	Certain amounts in prior periods have been reclassified to conform with the presentation of 2014. The reclassification affected depreciation, depletion and amortization and operating income (loss) between the Coal U.S. segment and the Corporate segment.
	A reconciliation of segment income (loss) from operations to loss before income taxes follows:
		Three Months Ended June 30,						Six Months Ended June 30,
		2014			2013			2014			2013
		(In thousands)
	Income (loss) from operations	$	(29,640	)	$	11,975		$	(21,588	)	$	17,710
	Loss on extinguishment of debt	(12,635		)	(64		)	(12,635		)	(64		)
	Interest expense	(21,786		)	(10,076		)	(42,584		)	(20,236		)
	Interest income	1,582			280			1,884			577
	Gain (loss) on foreign exchange	2,649			—			(4,141		)	—
	Other income	483			130			576			198
	Income (loss) before income taxes	$	(59,347	)	$	2,245		$	(78,488	)	$	(1,815	)

CONTINGENCIES

CONTINGENCIES	6 Months Ended
	Jun. 30, 2014
Commitments and Contingencies Disclosure [Abstract]	'
CONTINGENCIES	'
	CONTINGENCIES
	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.

SUPPLEMENTAL_CONSOLIDATING_FIN

SUPPLEMENTAL CONSOLIDATING FINANCIAL INFORMATION	6 Months Ended
	Jun. 30, 2014
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.
	As a result of the prepayment of the WML Notes, WML became a Guarantor Subsidiary. The following tables include WML as a Guarantor Subsidiary, including the 2013 information which has been recast.
	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;
	-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;
	-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.
	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:
	CONSOLIDATING BALANCE SHEETS
	June 30, 2014
	(In thousands)
	Assets		Parent/				Co-Issuer				Guarantor				Non-				Consolidating				Total
			Issuer								Subsidiaries				Guarantor				Adjustments
															Subsidiaries
	Current assets:
	Cash and cash equivalents		$	13,514			$	415			$	24,440			$	2,241			$	—			$	40,610
	Receivables:
	Trade		—				12,940				116,712				—				—				129,652
	Loan and lease receivable		—				—				11,682				—				—				11,682
	Contractual third-party reclamation receivables		—				—				7,940				—				—				7,940
	Intercompany receivable/payable		132,824				32,639				(146,187		)		(19,275		)		(1		)		—
	Other		673				210				2,294				45				(40		)		3,182
			133,497				45,789				(7,559		)		(19,230		)		(41		)		152,456
	Inventories		—				5,319				147,834				1				—				153,154
	Deferred income taxes		5,370				—				683				—				—				6,053
	Other current assets		972				335				11,055				—				—				12,362
	Total current assets		153,353				51,858				176,453				(16,988		)		(41		)		364,635
	Property, plant and equipment:
	Land and mineral rights		—				1,395				437,606				—				—				439,001
	Plant and equipment		4,022				221,350				606,965				—				—				832,337
			4,022				222,745				1,044,571				—				—				1,271,338
	Less accumulated depreciation, depletion and amortization		2,863				76,662				406,295				—				—				485,820
	Net property, plant and equipment		1,159				146,083				638,276				—				—				785,518
	Loan and lease receivable		—				—				85,344				—				—				85,344
	Advanced coal royalties		—				—				7,134				—				—				7,134
	Reclamation deposits		—				—				75,911				—				—				75,911
	Restricted investments and bond collateral		63,322				—				41,189				—				—				104,511
	Contractual third-party reclamation receivables		—				—				93,956				—				—				93,956
	Investment in joint venture		—				—				33,273				—				—				33,273
	Intangible assets		—				460				217				—				—				677
	Investment in subsidiaries		480,871				—				—				3,770				(484,641		)		—
	Other assets		21,825				—				10,937				3,500				(3,500		)		32,762
	Total assets		$	720,530			$	198,401			$	1,162,690			$	(9,718	)		$	(488,182	)		$	1,583,721
	CONSOLIDATING BALANCE SHEETS
	June 30, 2014
	(In thousands)
	Liabilities and Shareholders’ Deficit		Parent/				Co-Issuer				Guarantor				Non-				Consolidating				Total
			Issuer								Subsidiaries				Guarantor				Adjustments
															Subsidiaries
	Current liabilities
	Current installments of long-term debt		$	—			$	—			$	42,401			$	—			$	—			$	42,401
	Accounts payable and accrued expenses:
	Trade and other accrued liabilities		5,240				7,996				114,423				684				(5		)		128,338
	Interest payable		30,315				—				474				—				(39		)		30,750
	Production taxes		—				1,081				38,936				2,657				(1		)		42,673
	Workers’ compensation		707				—				—				—				—				707
	Postretirement medical benefits		12,042				—				773				1,139				1				13,955
	SERP		390				—				—				—				—				390
	Deferred revenue		—				9,581				1,980				—				—				11,561
	Asset retirement obligations		—				—				31,131				—				—				31,131
	Other current liabilities		593				5,279				6,102				—				(1		)		11,973
Total current liabilities		49,287				23,937				236,220				4,480				(45		)		313,879
Long-term debt, less current installments		698,015				—				96,128				—				(3,500		)		790,643
Workers’ compensation, less current portion		6,629				—				—				—				—				6,629
Excess of black lung benefit obligation over trust assets		9,841				—				—				—				—				9,841
Postretirement medical benefits, less current portion		184,902				—				68,766				18,105				—				271,773
Pension and SERP obligations, less current portion		12,776				97				9,110				239				—				22,222
Deferred revenue, less current portion		—				35,949				4,728				—				(1		)		40,676
Asset retirement obligations, less current portion		—				927				357,326				—				—				358,253
Intangible liabilities		—				5,072				—				—				—				5,072
Deferred income taxes		5,370				—				10,144				—				—				15,514
Other liabilities		707				5,790				3,167				200				—				9,864
Intercompany receivable/payable		13,648				—				(13,849		)		14,654				(14,453		)		—
Total liabilities		981,175				71,772				771,740				37,678				(17,999		)		1,844,366
Shareholders’ deficit
Preferred stock		96				—				—				—				—				96
Common stock		38,173				5				110				132				(247		)		38,173
Other paid-in capital		133,140				52,848				441,269				(124		)		(493,993		)		133,140
Accumulated other comprehensive loss		(53,615		)		(160		)		16,075				(3,067		)		(12,848		)		(53,615		)
Accumulated earnings (deficit)		(378,439		)		73,936				(66,504		)		(44,337		)		36,905				(378,439		)
Total equity (deficit)		(260,645		)		126,629				390,950				(47,396		)		(470,183		)		(260,645		)
Total liabilities and shareholders’ deficit		$	720,530			$	198,401			$	1,162,690			$	(9,718	)		$	(488,182	)		$	1,583,721
CONSOLIDATING BALANCE SHEETS
December 31, 2013
(In thousands)
Assets		Parent/				Co-Issuer				Guarantor				Non-				Consolidating				Total
		Issuer								Subsidiaries				Guarantor				Adjustments
														Subsidiaries
Current assets:
Cash and cash equivalents		$	25,326			$	3,341			$	27,451			$	4,992			$	—			$	61,110
Receivables:
Trade		—				12,934				46,985				6,277				—				66,196
Contractual third-party reclamation receivables		—				—				8,487				—				—				8,487
Intercompany receivable/payable		(16,273		)		—				2,761				(19,353		)		32,865				—
Other		1,616				210				3,256				28				(24		)		5,086
		(14,657		)		13,144				61,489				(13,048		)		32,841				79,769
Inventories		—				6,161				33,811				—				—				39,972
Deferred income taxes		5,355				—				870				—				(870		)		5,355
Restricted investments and bond collateral		—				5,998				—				—				—				5,998
Other current assets		789				143				11,069				834				—				12,835
Total current assets		16,813				28,787				134,690				(7,222		)		31,971				205,039
Property, plant and equipment:
Land and mineral rights		—				1,395				276,793				—				—				278,188
Plant and equipment		3,973				220,872				432,851				—				—				657,696
		3,973				222,267				709,644				—				—				935,884
Less accumulated depreciation, depletion and amortization		2,707				71,653				371,488				—				—				445,848
Net property, plant and equipment		1,266				150,614				338,156				—				—				490,036
Advanced coal royalties		—				—				7,311				—				—				7,311
Reclamation deposits		—				—				74,921				—				—				74,921
Restricted investments and bond collateral		15,134				—				54,101				—				—				69,235
Contractual third-party reclamation receivables		—				—				88,303				—				—				88,303
Intangible assets		—				1,283				237				—				—				1,520
Investment in subsidiaries		280,843				—				—				3,770				(284,613		)		—
Other assets		8,636				—				1,683				2,000				(1,999		)		10,320
Total assets		$	322,692			$	180,684			$	699,402			$	(1,452	)		$	(254,641	)		$	946,685
CONSOLIDATING BALANCE SHEETS
December 31, 2013
(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			$	—			$	23,951			$	—			$	—			$	44,343
Accounts payable and accrued expenses:
Trade		6,840				10,119				38,061				2,487				—				57,507
Interest payable		11,302				—				40				—				(21		)		11,321
Production taxes		—				3				36,522				5,380				—				41,905
Workers’ compensation		717				—				—				—				—				717
Postretirement medical benefits		12,042				—				774				1,139				—				13,955
SERP		390				—				—				—				—				390
Deferred revenue		—				9,024				5,044				—				—				14,068
Asset retirement obligations		—				—				23,353				—				—				23,353
Other current liabilities		—				5,053				417				—				(1		)		5,469
Total current liabilities		51,683				24,199				128,162				9,006				(22		)		213,028
Long-term debt, less current installments		224,582				—				72,912				—				(2,000		)		295,494
Workers’ compensation, less current portion		6,744				—				—				—				—				6,744
Excess of black lung benefit obligation over trust assets		8,675				—				—				—				—				8,675
Postretirement medical benefits, less current portion		185,858				—				66,439				18,077				—				270,374
Pension and SERP obligations, less current portion		13,069				99				10,765				243				—				24,176
Deferred revenue, less current portion		—				41,297				5,270				—				—				46,567
Asset retirement obligations, less current portion		—				892				255,619				—				—				256,511
Intangible liabilities		—				5,606				—				—				—				5,606
Deferred income taxes		5,355				—				—				—				—				5,355
Other liabilities		584				—				6,687				983				(6,220		)		2,034
Intercompany receivable/payable		14,021				—				(7,851		)		14,654				(20,824		)		—
Total liabilities		510,571				72,093				538,003				42,963				(29,066		)		1,134,564
Shareholders’ deficit
Preferred stock		160				—				—				—				—				160
Common stock		36,479				5				110				132				(247		)		36,479
Other paid-in capital		134,861				52,835				157,984				(124		)		(210,695		)		134,861
Accumulated other comprehensive loss		(63,595		)		(164		)		6,425				(3,086		)		(3,175		)		(63,595		)
Accumulated earnings (deficit)		(295,784		)		55,915				(3,120		)		(41,337		)		(11,458		)		(295,784		)
Total equity (deficit)		(187,879		)		108,591				161,399				(44,415		)		(225,575		)		(187,879		)
Total liabilities and shareholders’ deficit		$	322,692			$	180,684			$	699,402			$	(1,452	)		$	(254,641	)		$	946,685
CONSOLIDATING STATEMENTS OF OPERATIONS
Three Months Ended June 30, 2014
(In thousands)
	Parent/				Co-Issuer				Guarantor				Non-Guarantor				Consolidating				Total
	Issuer								Subsidiaries				Subsidiaries				Adjustments
Revenues	$	—			$	21,803			$	266,153			$	—			$	—			$	287,956
Costs and expenses:
Cost of sales	(247		)		21,592				227,044				—				—				248,389
Depreciation, depletion and amortization	79				2,485				21,915				—				—				24,479
Selling and administrative	12,003				1,169				15,921				(384		)		—				28,709
Heritage health benefit expenses	3,178				—				—				210				—				3,388
Gain on sales of assets	—				—				(43		)		—				—				(43		)
Restructuring charges	796				101				6,646				—				—				7,543
Derivative loss	—				5,930				—				—				—				5,930
Income from equity affiliates	—				—				(799		)		—				—				(799		)
	15,809				31,277				270,684				(174		)		—				317,596
Operating income (loss)	(15,809		)		(9,474		)		(4,531		)		174				—				(29,640		)
Other income (expense):
Interest expense	(18,609		)		(74		)		(3,111		)		(1		)		9				(21,786		)
Loss on extinguishment of debt	(63		)		—				(12,571		)		(1		)		—				(12,635		)
Interest income	145				4				1,433				—				—				1,582
Gain on foreign exchange	1,557				—				1,092				—				—				2,649
Other income	—				—				483				—				—				483
	(16,970		)		(70		)		(12,674		)		(2		)		9				(29,707		)
Income (loss) before income taxes and income of consolidated subsidiaries	(32,779		)		(9,544		)		(17,205		)		172				9				(59,347		)
Equity in income of subsidiaries	(30,462		)		—				—				—				30,462				—
Income (loss) before income taxes	(63,241		)		(9,544		)		(17,205		)		172				30,471				(59,347		)
Income tax expense (benefit)	(87		)		—				(74		)		1				3,967				3,807
Net income (loss)	(63,154		)		(9,544		)		(17,131		)		171				26,504				(63,154		)
Less net loss attributable to noncontrolling interest	—				—				—				—				—				—
Net income (loss) attributable to the Parent company	$	(63,154	)		$	(9,544	)		$	(17,131	)		$	171			$	26,504			$	(63,154	)
CONSOLIDATING STATEMENTS OF OPERATIONS
Three Months Ended June 30, 2013
(In thousands)
	Parent/				Co-Issuer				Guarantor				Non-Guarantor				Consolidating				Total
	Issuer								Subsidiaries				Subsidiaries				Adjustments
Revenues	$	—			$	23,162			$	134,449			$	9,538			$	(4,650	)		$	162,499
Costs and expenses:
Cost of sales	(372		)		14,901				113,640				7,009				(4,650		)		130,528
Depreciation, depletion and amortization	94				2,551				12,753				—				(1		)		15,397
Selling and administrative	4,259				872				7,232				(394		)		—				11,969
Heritage health benefit expenses	2,844				—				—				265				—				3,109
Gain on sales of assets	—				—				(74		)		—				—				(74		)
Other operating income	—				—				(10,405		)		—				—				(10,405		)
	6,825				18,324				123,146				6,880				(4,651		)		150,524
Operating income (loss)	(6,825		)		4,838				11,303				2,658				1				11,975
Other income (expense):
Interest expense	(7,591		)		(10		)		(2,479		)		(5		)		9				(10,076		)
Loss on extinguishment of debt	(64		)		—				—				—				—				(64		)
Interest income	46				5				232				6				(9		)		280
Other income (loss)	2				—				130				(2		)		—				130
	(7,607		)		(5		)		(2,117		)		(1		)		—				(9,730		)
Income (loss) before income taxes and income of consolidated subsidiaries	(14,432		)		4,833				9,186				2,657				1				2,245
Equity in income of subsidiaries	16,648				—				—				—				(16,648		)		—
Income (loss) before income taxes	2,216				4,833				9,186				2,657				(16,647		)		2,245
Income tax expense (benefit)	(1		)		—				1,139				—				(1,110		)		28
Net income (loss)	2,217				4,833				8,047				2,657				(15,537		)		2,217
Less net loss attributable to noncontrolling interest	2,499				—				—				—				—				2,499
Net income (loss) attributable to the Parent company	$	(282	)		$	4,833			$	8,047			$	2,657			$	(15,537	)		$	(282	)
CONSOLIDATING STATEMENTS OF OPERATIONS
Six Months Ended June 30, 2014
(In thousands)
	Parent/				Co-Issuer				Guarantor				Non-Guarantor				Consolidating				Total
	Issuer								Subsidiaries				Subsidiaries				Adjustments
Revenues	$	—			$	43,815			$	424,351			$	(7	)		$	—			$	468,159
Costs and expenses:
Cost of sales	(471		)		38,046				349,389				55				—				387,019
Depreciation, depletion and amortization	156				5,009				35,373				—				—				40,538
Selling and administrative	16,968				2,062				23,783				(773		)		—				42,040
Heritage health benefit expenses	6,504				—				—				428				—				6,932
Gain on sales of assets	—				—				(5		)		—				—				(5		)
Restructuring charges	796				499				6,646				—				—				7,941
Derivative loss	—				5,930				—				—				—				5,930
Equity in net income of unconsolidated affiliates	—				—				(799		)		—				—				(799		)
Other operating income	—				—				150				1				—				151
	23,953				51,546				414,537				(289		)		—				489,747
Operating income (loss)	(23,953		)		(7,731		)		9,814				282				—				(21,588		)
Other income (expense):
Interest expense	(37,282		)		(118		)		(5,199		)		—				15				(42,584		)
Loss on extinguishment of debt	(62		)		—				(12,572		)		(1		)		—				(12,635		)
Interest income	269				7				1,608				15				(15		)		1,884
Gain (loss) on foreign exchange	(5,233		)		—				1,092				—				—				(4,141		)
Other income	—				—				576				—				—				576
	(42,308		)		(111		)		(14,495		)		14				—				(56,900		)
Income (loss) before income taxes and income of consolidated subsidiaries	(66,261		)		(7,842		)		(4,681		)		296				—				(78,488		)
Equity in income of subsidiaries	(16,148		)		—				—				—				16,148				—
Income (loss) before income taxes	(82,409		)		(7,842		)		(4,681		)		296				16,148				(78,488		)
Income tax expense (benefit)	(224		)		—				5,041				—				(1,120		)		3,697
Net income (loss)	(82,185		)		(7,842		)		(9,722		)		296				17,268				(82,185		)
Less net loss attributable to noncontrolling interest	—				—				—				—				—				—
Net income (loss) attributable to the Parent company	$	(82,185	)		$	(7,842	)		$	(9,722	)		$	296			$	17,268			$	(82,185	)
CONSOLIDATING STATEMENTS OF OPERATIONS
Six Months Ended June 30, 2013
(In thousands)
	Parent/				Co-Issuer				Guarantor				Non-Guarantor				Consolidating				Total
	Issuer								Subsidiaries				Subsidiaries				Adjustments
Revenues	$	—			$	42,498			$	274,187			$	20,889			$	(13,627	)		$	323,947
Costs and expenses:
Cost of sales	(770		)		31,856				223,417				20,073				(13,627		)		260,949
Depreciation, depletion and amortization	187				5,082				24,554				—				—				29,823
Selling and administrative	8,207				1,726				14,680				(758		)		—				23,855
Heritage health benefit expenses	6,533				—				—				527				—				7,060
Gain on sales of assets	—				—				(308		)		—				—				(308		)
Other operating income	—				—				(15,142		)		—				—				(15,142		)
	14,157				38,664				247,201				19,842				(13,627		)		306,237
Operating income (loss)	(14,157		)		3,834				26,986				1,047				—				17,710
Other income (expense):
Interest expense	(15,175		)		(20		)		(5,048		)		(10		)		17				(20,236		)
Loss on extinguishment of debt	(64		)		—				—				—				—				(64		)
Interest income	76				15				493				10				(17		)		577
Other income (loss)	—				—				200				(2		)		—				198
	(15,163		)		(5		)		(4,355		)		(2		)		—				(19,525		)
Income (loss) before income taxes and income of consolidated subsidiaries	(29,320		)		3,829				22,631				1,045				—				(1,815		)
Equity in income of subsidiaries	27,450				—				—				—				(27,450		)		—
Income (loss) before income taxes	(1,870		)		3,829				22,631				1,045				(27,450		)		(1,815		)
Income tax expense (benefit)	—				—				4,458				—				(4,403		)		55
Net income (loss)	(1,870		)		3,829				18,173				1,045				(23,047		)		(1,870		)
Less net loss attributable to noncontrolling interest	797				—				—				—				—				797
Net income (loss) attributable to the Parent company	$	(2,667	)		$	3,829			$	18,173			$	1,045			$	(23,047	)		$	(2,667	)
CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS)
Three Months Ended June 30, 2014
(In thousands)
	Parent/Issuer				Co-Issuer				Guarantor				Non-Guarantor				Consolidating				Total
									Subsidiaries				Subsidiaries				Adjustments
Net income (loss)	$	(63,154	)		$	(9,544	)		$	(17,131	)		$	171			$	26,504			$	(63,154	)
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
Tax effect of other comprehensive income gains	64				—				—				—				—				64
Change in foreign currency translation adjustment	9,477				—				9,477				—				(9,477		)		9,477
Other comprehensive income (loss)	9,905				2				9,563				11				(9,576		)		9,905
Comprehensive income (loss) attributable to the Parent company	$	(53,249	)		$	(9,542	)		$	(7,568	)		$	182			$	16,928			$	(53,249	)
CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS)
Three Months Ended June 30, 2013
(In thousands)
	Parent/Issuer				Co-Issuer				Guarantor				Non-Guarantor				Consolidating				Total
									Subsidiaries				Subsidiaries				Adjustments
Net income (loss)	$	2,217			$	4,833			$	8,047			$	2,657			$	(15,537	)		$	2,217
Other comprehensive income (loss)
Amortization of accumulated actuarial gains or losses, pension	1,004				8				239				—				(247		)		1,004
Amortization of accumulated actuarial gains or losses, transition obligations, and prior service costs, postretirement medical benefit	1,001				—				214				—				(214		)		1,001
Unrealized and realized gains and losses on available-for-sale securities	(39		)		—				(40		)		—				40				(39		)
Other comprehensive income (loss)	1,966				8				413				—				(421		)		1,966
Comprehensive income (loss) attributable to the Parent company	$	4,183			$	4,841			$	8,460			$	2,657			$	(15,958	)		$	4,183
CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS)
Six Months Ended June 30, 2014
(In thousands)
	Parent/Issuer				Co-Issuer				Guarantor				Non-Guarantor				Consolidating				Total
									Subsidiaries				Subsidiaries				Adjustments
Net income (loss)	$	(82,185	)		$	(7,842	)		$	(9,722	)		$	296			$	17,268			$	(82,185	)
Other comprehensive income (loss)
Amortization of accumulated actuarial gains or losses, pension	717				4				244				11				(259		)		717
Amortization of accumulated actuarial gains or losses, transition obligations, and prior service costs, postretirement medical benefit	10				—				(72		)		10				62				10
Tax effect of other comprehensive income gains	(224		)		—				—				—				—				(224		)
Change in foreign currency translation adjustment	9,477				—				9,477				—				(9,477		)		9,477
Other comprehensive income (loss)	9,980				4				9,649				21				(9,674		)		9,980
Comprehensive income (loss) attributable to the Parent company	$	(72,205	)		$	(7,838	)		$	(73	)		$	317			$	7,594			$	(72,205	)
CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS)
Six Months Ended June 30, 2013
(In thousands)
	Parent/Issuer				Co-Issuer				Guarantor				Non-Guarantor				Consolidating				Total
									Subsidiaries				Subsidiaries				Adjustments
Net income (loss)	$	(1,870	)		$	3,829			$	18,173			$	1,045			$	(23,047	)		$	(1,870	)
Other comprehensive income (loss)
Amortization of accumulated actuarial gains or losses, pension	1,745				14				432				—				(446		)		1,745
Amortization of accumulated actuarial gains or losses, transition obligations, and prior service costs, postretirement medical benefit	2,002				—				427				—				(427		)		2,002
Unrealized and realized gains and losses on available-for-sale securities	(39		)		—				(40		)		—				40				(39		)
Other comprehensive income (loss)	3,708				14				819				—				(833		)		3,708
Comprehensive income (loss) attributable to the Parent company	$	1,838			$	3,843			$	18,992			$	1,045			$	(23,880	)		$	1,838
CONSOLIDATING STATEMENTS OF CASH FLOWS
Six Months Ended June 30, 2014
(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)		$	(82,185	)		$	(7,842	)		$	(9,722	)		$	296			$	17,268			$	(82,185	)
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Equity in income of subsidiaries		16,148				—				—				—				(16,148		)		—
Depreciation, depletion, and amortization		156				5,009				35,373				—				—				40,538
Accretion of asset retirement obligation and receivable		—				34				9,254				—				—				9,288
Non-cash tax benefits		(224		)		—				—				—				—				(224		)
Amortization of intangible assets and liabilities, net		—				290				20				—				—				310
Share-based compensation		1,934				14				497				—				—				2,445
Gain on sales of assets		—				—				(5		)		—				—				(5		)
Amortization of deferred financing costs		494				—				715				—				—				1,209
Loss on extinguishment of debt		62				—				12,572				1				—				12,635
Loss on sales of investment securities		—				—				3				—				—				3
Loss on derivative		—				5,930				—				—				—				5,930
Loss on foreign exchange		5,233				—				(1,092		)		—				—				4,141
Income from equity affiliates		—				—				(799		)		—				—				(799		)
Distributions from equity affiliates		—				—				730				—				—				730
Changes in operating assets and liabilities:
Receivables, net		943				(6		)		(18,474		)		4,733				1,534				(11,270		)
Inventories		—				842				21,929				(1		)		—				22,770
Excess of black lung benefit obligation over trust assets		1,166				—				—				—				—				1,166
Deferred income tax		—				—				3,854				—				—				3,854
Accounts payable and accrued expenses		17,348				(1,101		)		(3,164		)		(4,526		)		(19		)		8,538
Deferred revenue		—				(4,791		)		(3,633		)		—				—				(8,424		)
Income tax payable		—				—				528				—				—				528
Accrual for workers’ compensation		(125		)		—				—				—				—				(125		)
Asset retirement obligations		—				—				(3,364		)		2				—				(3,362		)
Accrual for postretirement medical benefits		(885		)		—				2,256				38				—				1,409
Pension and SERP obligations		166				2				(507		)		7				—				(332		)
Other assets and liabilities		(7,429		)		(273		)		4,113				(1,193		)		6,587				1,805
Distributions received from subsidiaries		76,800				—				—				—				(76,800		)		—
Net cash provided by (used in) operating activities		29,602				(1,892		)		51,084				(643		)		(67,578		)		10,573
Cash flows from investing activities:
Additions to property, plant and equipment		16				(255		)		(17,122		)		—				—				(17,361		)
Change in restricted investments and bond collateral and reclamation deposits		(48,188		)		5,998				11,673				—				—				(30,517		)
Cash payments related to Canadian acquisition		(282,788		)		—				(39,849		)		—				—				(322,637		)
Cash acquired related to Canadian acquisition		—				—				8,103				—				—				8,103
Net proceeds from sales of assets		—				—				213				—				—				213
Proceeds from the sale of investments		—				—				246				—				—				246
Increase in loan and lease receivable		—				—				(1,120		)		—				—				(1,120		)
Receipts from loan and lease receivable		—				—				2,164				—				—				2,164
Receivable from customer for property and equipment purchases		—				—				—				—				—				—
Other		—				—				(82		)		—				—				(82		)
Net cash provided by (used in) investing activities		(330,960		)		5,743				(35,774		)		—				—				(360,991		)
Cash flows from financing activities:
Change in book overdrafts		—				—				1,605				—				—				1,605
Borrowings from long-term debt		454,219				—				—				—				—				454,219
Repayments of long-term debt		(1,015		)		—				(96,523		)		—				—				(97,538		)
Borrowings on revolving lines of credit		—				—				10,000				—				—				10,000
Repayments on revolving lines of credit		—				—				(10,000		)		—				—				(10,000		)
Debt issuance costs and other refinancing costs		(15,407		)		—				(11,646		)		—				—				(27,053		)
Dividends/distributions		(470		)		(8,500		)		(68,300		)		—				76,800				(470		)
Exercise of stock options		193				—				—				—				—				193
Transactions with Parent/affiliates		(147,974		)		1,723				157,581				(2,108		)		(9,222		)		—
Net cash provided by (used in) financing activities		289,546				(6,777		)		(17,283		)		(2,108		)		67,578				330,956
Effect of foreign exchange rates on cash		—				—				(1,038		)		—				—				(1,038		)
Net decrease in cash and cash equivalents		(11,812		)		(2,926		)		(3,011		)		(2,751		)		—				(20,500		)
Cash and cash equivalents, beginning of period		25,326				3,341				27,451				4,992				—				61,110
Cash and cash equivalents, end of period		$	13,514			$	415			$	24,440			$	2,241			$	—			$	40,610
CONSOLIDATING STATEMENTS OF CASH FLOWS
Six Months Ended June 30, 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)		$	(1,870	)		$	3,829			$	18,173			$	1,045			$	(23,047	)		$	(1,870	)
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Equity in income of subsidiaries		(27,450		)		—				—				—				27,450				—
Depreciation, depletion, and amortization		187				5,082				24,554				—				—				29,823
Accretion of asset retirement obligation and receivable		—				32				6,305				1				—				6,338
Amortization of intangible assets and liabilities, net		—				312				19				(5		)		—				326
Share-based compensation		1,567				23				2,181				—				—				3,771
Gain on sales of assets		—				—				(308		)		—				—				(308		)
Amortization of deferred financing costs		1,541				—				315				—				—				1,856
Loss on extinguishment of debt		64				—				—				—				—				64
Loss on sales of investment securities		—				—				(28		)		—				—				(28		)
Changes in operating assets and liabilities:
Receivables, net		(227		)		(1,995		)		4,419				(239		)		1,729				3,687
Inventories		—				(1,632		)		(345		)		—				—				(1,977		)
Excess of black lung benefit obligation over trust assets		(280		)		—				—				(1		)		—				(281		)
Accounts payable and accrued expenses		(1,957		)		4,101				904				(1,146		)		(201		)		1,701
Deferred revenue		—				(4,190		)		(2,025		)		1				—				(6,214		)
Income tax payable		—				—				(55		)		(1		)		—				(56		)
Accrual for workers’ compensation		(284		)		—				—				—				—				(284		)
Asset retirement obligations		—				—				(5,422		)		(2		)		—				(5,424		)
Accrual for postretirement medical benefits		(40		)		—				4,010				124				—				4,094
Pension and SERP obligations		695				9				826				(13		)		—				1,517
Other assets and liabilities		(49		)		101				(1,489		)		(374		)		—				(1,811		)
Distributions received from subsidiaries		36,600				—				—				—				(36,600		)		—
Net cash provided by (used in) operating activities		8,497				5,672				52,034				(610		)		(30,669		)		34,924
Cash flows from investing activities:
Additions to property, plant and equipment		(575		)		(698		)		(12,189		)		(4		)		(1		)		(13,467		)
Change in restricted investments and bond collateral and reclamation deposits		(807		)		(5		)		(7,902		)		—				—				(8,714		)
Net proceeds from sales of assets		—				—				577				—				—				577
Proceeds from the sale of investments		—				—				6,807				—				—				6,807
Receivable from customer for property and equipment purchases		—				—				(307		)		(1		)		—				(308		)
Net cash used in investing activities		(1,382		)		(703		)		(13,014		)		(5		)		(1		)		(15,105		)
Cash flows from financing activities:
Change in book overdrafts		—				—				1,777				—				—				1,777
Repayments of long-term debt		(500		)		—				(15,561		)		(9		)		—				(16,070		)
Borrowings on revolving lines of credit		—				—				6,000				—				—				6,000
Repayments on revolving lines of credit		—				—				(6,000		)		—				—				(6,000		)
Debt issuance costs and other refinancing costs		(26		)		—				(156		)		—				—				(182		)
Dividends/distributions		(680		)		(9,000		)		(27,600		)		—				36,600				(680		)
Transactions with Parent/affiliates		(5,080		)		(38		)		8,699				2,349				(5,930		)		—
Net cash provided by (used in) financing activities		(6,286		)		(9,038		)		(32,841		)		2,340				30,670				(15,155		)
Net increase (decrease) in cash and cash equivalents		829				(4,069		)		6,179				1,725				—				4,664
Cash and cash equivalents, beginning of period		14,836				4,545				10,237				1,992				—				31,610
Cash and cash equivalents, end of period		$	15,665			$	476			$	16,416			$	3,717			$	—			$	36,274

ACQUISITION_Tables

ACQUISITION (Tables)	6 Months Ended
	Jun. 30, 2014
Business Combinations [Abstract]	'
Summary of purchase consideration and allocation of purchase consideration	'
	A summary of the purchase consideration and a preliminary allocation of the purchase consideration follows (in millions):
	Purchase Price:
	Cash paid - Initial payment	$	282.8
	Cash paid - Working capital adjustment	39.8
	Total cash consideration	$	322.6
	Preliminary allocation of purchase price:
	Assets:
	Cash and cash equivalents	$	26.2
	Trade receivables	49.9
	Inventories - materials and supplies	52
	Inventories - coal	79.8
	Leases and loans receivable	11.2
	Deferred tax assets	6.7
	Other current assets	3.4
	Total current assets	229.2
	Land and mineral rights	151.3
	Plant and equipment	171.7
	Leases and loans receivable	83.8
	Contractual third-party reclamation receivables, less current portion	6.8
	Other assets	10.3
	Total Assets	653.1
	Liabilities:
	Current installments of long-term debt	(36.3		)
	Trade payables and other accrued liabilities	(93.7		)
	Asset retirement obligations	(9.7		)
	Total current liabilities	(139.7		)
	Long-term debt, less current installments	(86.3		)
	Asset retirement obligations, less current portion	(92.4		)
	Deferred tax liabilities	(12.1		)
	Total Liabilities	(330.5		)
	Net fair value	$	322.6
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, 2013. 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, 2013, or of future results of operations.
		Three Months Ended June 30,						Six Months Ended June 30,
		2014			2013			2014			2013
	Total Revenues	(In thousands, except per share data)
	As reported	$	287,956		$	162,499		$	468,159		$	323,947
	Pro forma	$	320,761		$	356,962		$	674,378		$	672,735
	Operating Income
	As reported	$	(29,640	)	$	11,975		$	(21,588	)	$	17,710
	Pro forma	$	(50,032	)	$	17,081		$	(14,433	)	$	30,105
	Net loss applicable to common shareholders
	As reported	$	(63,363	)	$	(622	)	$	(82,655	)	$	(3,347	)
	Pro forma	$	(89,247	)	$	(4,167	)	$	(97,509	)	$	(9,131	)
	Net loss per share applicable to common shareholders
	As reported	$	(4.19	)	$	(0.04	)	$	(5.52	)	$	(0.23	)
	Pro forma	$	(5.90	)	$	(0.29	)	$	(6.52	)	$	(0.63	)

INVENTORIES_Tables

INVENTORIES (Tables)	6 Months Ended
	Jun. 30, 2014
Inventory Disclosure [Abstract]	'
Inventories	'
	nventories consisted of the following:
		June 30, 2014			December 31, 2013
		(In thousands)
	Coal stockpiles	$	61,663		$	543
	Coal fuel inventories	5,319			6,161
	Materials and supplies	86,946			34,233
	Reserve for obsolete inventory	(774		)	(965		)
	Total	$	153,154		$	39,972

RESTRICTED_INVESTMENTS_AND_BON1

RESTRICTED INVESTMENTS AND BOND COLLATERAL (Tables)	6 Months Ended
	Jun. 30, 2014
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:
		June 30, 2014			31-Dec-13
		(In thousands)
	Coal - U.S. Segment:
	WML debt reserve account	$	—		$	13,067
	Reclamation bond collateral:
	Kemmerer Mine	25,077			24,966
	Absaloka Mine	11,696			11,653
	Rosebud Mine	3,145			3,145
	Beulah Mine	1,270			1,270
	Coal - Canada Segment:
	PMRU	16,201			—
	CVRI	31,867			—
	Power Segment:
	Letter of credit account	—			5,998
	Corporate Segment:
	Postretirement medical benefit bonds	8,550			8,467
	Workers’ compensation bonds	6,705			6,667
	Total restricted investments and bond collateral	104,511			75,233
	Less current portion	—			(5,998		)
	Total restricted investments and bond collateral, less current portion	$	104,511		$	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 June 30, 2014 are as follows:
		Carrying Value			Fair Value
		(In thousands)
	Cash and cash equivalents	$	67,340		$	67,340
	Time deposits	2,451			2,451
	Held-to-maturity securities	34,720			35,259
		$	104,511		$	105,050
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 June 30, 2014 is as follows (in thousands):
	Amortized cost	$	34,720
	Gross unrealized holding gains	628
	Gross unrealized holding losses	(89		)
	Fair value	$	35,259
Restricted Investments and Bond Collateral	'
Schedule of Held-to-maturity Securities [Line Items]	'
Maturities of held-to-maturity securities	'
	Maturities of held-to-maturity securities are as follows at June 30, 2014:
		Amortized Cost			Fair Value
		(In thousands)
	Due within one year	$	1,212		$	1,230
	Due in five years or less	19,360			19,704
	Due after five years to ten years	8,897			9,070
	Due in more than ten years	5,251			5,255
		$	34,720		$	35,259

RESTRUCTURING_CHARGES_Tables

RESTRUCTURING CHARGES (Tables)	6 Months Ended
	Jun. 30, 2014
ROVA I and ROVA II Contracts	'
Restructuring Cost and Reserve [Line Items]	'
Restructuring and Related Costs	'
	The table below represents the restructuring provision activity related to the ROVA restructuring affecting our Power segment during the six months ended June 30, 2014 (in millions):
	Beginning Balance		Restructuring Charges		Restructuring Payments		Ending Balance
	$	5.1	$	0.5	$	0.5	$	5.1
Canadian Acquisition	'
Restructuring Cost and Reserve [Line Items]	'
Restructuring and Related Costs	'
	The table below represents the restructuring provision activity related to the Canadian Acquisition affecting our Coal - Canada and Coal - US segments during the six months ended June 30, 2014 (in millions):
	Beginning Balance		Restructuring Charges		Restructuring Payments		Ending Balance
	$	—	$	8	$	0.4	$	7.6

LINES_OF_CREDIT_AND_LONGTERM_D1

LINES OF CREDIT AND LONG-TERM DEBT (Tables)	6 Months Ended
	Jun. 30, 2014
Debt Disclosure [Abstract]	'
Outstanding lines of credit and long-term debt	'
	The amounts outstanding under the Company’s debt consisted of the following as of the dates indicated:
		Total Debt Outstanding
		June 30, 2014			December 31, 2013
		(In thousands)
	10.75% Senior Notes due 2018	$	250,485		$	251,500
	Add-On Notes - 10.75% senior notes due 2018	425,000			—
	8.02% WML term debt due 2018	—			85,500
	Capital lease obligations	133,240			10,153
	Other	5,286			1,209
	Debt premium (discount), net	19,033			(8,525		)
	Total debt outstanding	833,044			339,837
	Less current installments	(42,401		)	(44,343		)
	Total debt outstanding, less current installments	$	790,643		$	295,494
Contractual maturities of all long-term debt	'
	The following table presents aggregate contractual debt maturities of all debt:
		As of June 30, 2014
		(In thousands)
	2014	$	22,270
	2015	41,290
	2016	39,318
	2017	25,776
	2018	682,852
	Thereafter	2,505
	Total	814,011
	Plus: debt premium (discount), net	19,033
	Total debt	$	833,044

POSTRETIREMENT_MEDICAL_BENEFIT1

POSTRETIREMENT MEDICAL BENEFITS AND PENSION (Tables)	6 Months Ended
	Jun. 30, 2014
Postretirement Medical Benefits	'
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]	'
Components of net periodic benefit cost	'
	The components of net periodic postretirement medical benefit cost are as follows:
		Three Months Ended June 30,						Six Months Ended June 30,
		2014			2013			2014			2013
		(In thousands)						(In thousands)
	Components of net periodic benefit cost:
	Service cost	$	822		$	1,109		$	1,645		$	2,218
	Interest cost	3,203			3,035			6,407			6,069
	Amortization of deferred items	4			1,001			9			2,003
	Total net periodic benefit cost	$	4,029		$	5,145		$	8,061		$	10,290
	The following table shows the net periodic postretirement medical benefit costs that relate to current and former mining operations:
		Three Months Ended June 30,						Six Months Ended June 30,
		2014			2013			2014			2013
		(In thousands)						(In thousands)
	Former mining operations	$	2,402		$	3,119		$	4,807		$	6,237
	Current operations	1,627			2,026			3,254			4,053
	Total net periodic benefit cost	$	4,029		$	5,145		$	8,061		$	10,290
Pension	'
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]	'
Components of net periodic benefit cost	'
	The Company incurred net periodic benefit costs of providing these pension benefits as follows:
		Three Months Ended June 30,						Six Months Ended June 30,
		2014			2013			2014			2013
		(In thousands)						(In thousands)
	Components of net periodic benefit cost:
	Service cost	$	500		$	638		$	1,000		$	1,173
	Interest cost	1,638			1,555			3,384			3,180
	Expected return on plan assets	(2,154		)	(2,325		)	(4,307		)	(4,385		)
	Amortization of deferred items	359			1,004			719			1,745
	Total net periodic pension cost	$	343		$	872		$	796		$	1,713

HERITAGE_HEALTH_BENEFIT_EXPENS1

HERITAGE HEALTH BENEFIT EXPENSES (Tables)	6 Months Ended
	Jun. 30, 2014
Heritage Health Benefit Expenses [Abstract]	'
Components of costs of benefits to former mining operation employees	'
	The components of these expenses are as follows:
		Three Months Ended June 30,					Six Months Ended June 30,
		2014		2013			2014		2013
		(In thousands)					(In thousands)
	Health care benefits	$	2,376	$	3,089		$	4,650	$	6,266
	Combined benefit fund payments	512		576			1,025		1,152
	Workers’ compensation benefits	124		117			260		232
	Black lung benefits	376		(673		)	997		(590		)
	Total	$	3,388	$	3,109		$	6,932	$	7,060

ASSET_RETIREMENT_OBLIGATIONS_C1

ASSET RETIREMENT OBLIGATIONS, CONTRACTUAL THIRD-PARTY RECLAMATION RECEIVABLES, AND RECLAMATION DEPOSITS (Tables)	6 Months Ended
	Jun. 30, 2014
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 operating segments at June 30, 2014 are summarized below:
		Asset			Contractual			Reclamation
		Retirement			Third-Party			Deposits
		Obligation			Reclamation
					Receivable
		(In thousands)
	Coal - U.S.	$	281,346		$	95,157		$	75,911
	Coal - Canada	107,111			6,739			—
	Power	927			—			—
	Total	$	389,384		$	101,896		$	75,911
Changes in Company's asset retirement obligations	'
	Changes in the Company’s asset retirement obligations were as follows:
		Six Months Ended June 30,
		2014			2013
		(In thousands)
	Asset retirement obligations, beginning of year (including current portion)	$	279,864		$	263,847
	Accretion	14,003			10,951
	Liabilities settled	(10,250		)	(11,647		)
	ARO acquired	102,075			—
	Changes due to foreign currency translation	3,692			—
	Asset retirement obligations, end of period	389,384			263,151
	Less current portion	(31,131		)	(24,105		)
	Asset retirement obligations, less current portion	$	358,253		$	239,046
Carrying value and estimated fair value of reclamation deposits	'
	The Company’s carrying value and estimated fair value of its reclamation deposits at June 30, 2014 are as follows:
		Carrying Value			Fair Value			Fair Value Hierarchy
		(In thousands)
	Cash and cash equivalents	$	44,089		$	44,089		Level 1
	Held-to-maturity securities	31,822			32,601			Level 2
		$	75,911		$	76,690
Amortized cost, gross unrealized holding gains and losses and fair value of held-to-maturity securities	'
	The amortized cost, gross unrealized holding gains and losses and fair value of held-to-maturity securities at June 30, 2014 are as follows (in thousands):
	Amortized cost	$	31,822
	Gross unrealized holding gains	953
	Gross unrealized holding losses	(174		)
	Fair value	$	32,601
Reclamation Deposits	'
Schedule of Held-to-maturity Securities [Line Items]	'
Schedule of maturities of held-to-maturity investments	'
	Maturities of held-to-maturity securities are as follows at June 30, 2014:
		Amortized Cost			Fair Value
		(In thousands)
	Within one year	$	1,025		$	998
	Due in five years or less	17,341			17,829
	Due after five years to ten years	7,289			7,424
	Due in more than ten years	6,167			6,350
		$	31,822		$	32,601

DERIVATIVE_INSTRUMENTS_Tables

DERIVATIVE INSTRUMENTS (Tables)	6 Months Ended
	Jun. 30, 2014
Derivative Instruments and Hedging Activities Disclosure [Abstract]	'
Schedule of Other Derivatives Not Designated as Hedging Instruments, Statements of Financial Performance and Financial Position, Location [Table Text Block]	'
	The fair value of outstanding derivative instruments not designated as hedging instruments on the accompanying Consolidated Balance Sheet was as follows (in thousands):
	Derivative Instruments	Balance Sheet Location	June 30, 2014
	Contracts to purchase power	Other current liabilities	$	140
	Contracts to purchase power	Other liabilities	5,790
	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 June 30, 2014			Six Months Ended June 30, 2014
		Operations Location
	Canadian dollar foreign exchange forward contracts	Gain (loss) on foreign exchange	$	581		$	(6,209	)
	Contracts to purchase power	Derivative loss	(5,930		)	(5,930		)

FAIR_VALUE_MEASUREMENTS_Tables

FAIR VALUE MEASUREMENTS (Tables)	6 Months Ended
	Jun. 30, 2014
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:
		Carrying Value		Fair Value
		(In thousands)
	31-Dec-13	$	328,473	$	364,329
	June 30, 2014	$	694,515	$	726,146

SHAREHOLDERS_EQUITY_AND_ACCUMU1

SHAREHOLDERS' EQUITY AND ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) (Tables)	6 Months Ended
	Jun. 30, 2014
Stockholders' Equity Note [Abstract]	'
Changes in Accumulated Other Comprehensive Income by component	'
	The following table reflects the changes in accumulated other comprehensive income (loss) by component:
		Pension				Postretirement				Foreign currency translation adjustment		Tax effect of			Accumulated
						medical benefits						other			other
												comprehensive			comprehensive
												income gains			loss
		(In thousands)
	Balance at December 31, 2013	$	(12,255	)		$	(20,292	)		$	—	$	(31,048	)	$	(63,595	)
	Other comprehensive income (loss) before reclassifications	—				—				9,477		(224		)	9,253
	Amounts reclassified from accumulated other comprehensive income (loss)	717				10				—		—			727
	Balance at June 30, 2014	$	(11,538	)		$	(20,282	)		$	9,477	$	(31,272	)	$	(53,615	)
Reclassifications out of Accumulated Other Comprehensive Income for the period	'
	The following table reflects the reclassifications out of accumulated other comprehensive loss for the six months ended June 30, 2014 are as follows (in thousands):
	Details about accumulated other comprehensive loss components		Amount reclassified from accumulated								Affected line item
			other comprehensive loss1								in the statement
											where net income
			Three Months Ended June 30, 2014				Six Months Ended June 30, 2014				(loss) is presented
	Amortization of defined benefit pension items
	Actuarial losses		$	359			$	717			2
	Amortization of postretirement medical items
	Prior service costs		$	(159	)		$	(318	)		3
	Actuarial losses		164				328				3
	Total		$	5			$	10
	____________________
	-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 7 - Pension for additional details)
	-3	These accumulated other comprehensive loss components are included in the computation of net periodic postretirement medical cost. (See Note 7 - Postretirement Medical Benefits for additional details)

SHAREBASED_COMPENSATION_Tables

SHARE-BASED COMPENSATION (Tables)	6 Months Ended
	Jun. 30, 2014
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]	'
Compensation cost arising from share-based arrangements	'
	The Company recognized compensation expense from share-based arrangements shown in the following table:
		Three Months Ended June 30,						Six Months Ended June 30,
		2014			2013			2014				2013
		(In thousands)
	Recognition of fair value of restricted stock units, stock options and SARs over vesting period; and issuance of stock	$	1,388		$	597		$	2,116			$	2,260
	Contributions of stock to the Company's 401(k) plan	329			788			329				1,511
	Total share-based compensation expense	$	1,717		$	1,385		$	2,445			$	3,771
Summary of Restricted Stock Unit activity	'
	A summary of restricted stock award activity for the six months ended June 30, 2014 is as follows:
		Units		Weighted			Unamortized
				Average			Compensation
				Grant-Date			Expense
				Fair Value			(In thousands)
	Non-vested at December 31, 2013	588,727		$	9.37
	Granted	214,188		—
	Vested	(299,872	)	—
	Non-vested at June 30, 2014	503,043		$	8.64		$	5,605		(1)
	____________________
	-1	Expected to be recognized over the next three years.
Summary of Stock Option Activity	'
	A summary of stock option activity for the six months ended June 30, 2014 is as follows:
		Stock Options		Weighted			Weighted			Aggregate Intrinsic				Unamortized
				Average			Average			Value				Compensation
				Exercise Price			Remaining			(In thousands)				Expense
							Contractual							(In thousands)
							Life
							(In years)
	Outstanding at December 31, 2013	145,806		$	21.97
	Exercised	(9,000	)	$	21.4
	Expired	—		$	—
	Outstanding and exercisable at June 30, 2014	136,806		$	22.01		3.7			$	1,953			$	—
Summary of Stock Appreciation Rights	'
	A summary of SARs activity for the six months ended June 30, 2014 is as follows:
		SARs		Weighted			Weighted		Aggregate Intrinsic				Unamortized
				Average Exercise Price			Average		Value				Compensation
							Remaining		(In thousands)				Expense
							Contractual						(In thousands)
							Life
							(In years)
	Outstanding at December 31, 2013	70,734		$	22.6
	Exercised	(36,291	)	$	21.3
	Expired	—		$	—
	Outstanding and exercisable at June 30, 2014	34,443		$	23.97		1.7		$	424			$	—

EARNINGS_PER_SHARE_Tables

EARNINGS PER SHARE (Tables)	6 Months Ended
	Jun. 30, 2014
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:
		Three Months Ended June 30,				Six Months Ended June 30,
		2014		2013		2014		2013
		(In thousands)
	Convertible securities	$	654	$	1,093	$	654	$	1,093
	Restricted stock units, stock options and SARs	674		862		674		862
	Total shares excluded from diluted shares calculation	$	1,328	$	1,955	$	1,328	$	1,955

BUSINESS_SEGMENT_INFORMATION_T

BUSINESS SEGMENT INFORMATION (Tables)	6 Months Ended
	Jun. 30, 2014
Segment Reporting [Abstract]	'
Summarized financial information by segment	'
	Summarized financial information by segment is as follows:
		Coal - U.S.			Coal - Canada(1)			Power			Heritage			Corporate			Consolidated
		(In thousands)
	Three Months Ended June 30, 2014
	Revenues	$	150,107		$	116,046		$	21,803		$	—		$	—		$	287,956
	Restructuring charges	491			6,646			101			—			305			7,543
	Depreciation, depletion, and amortization	13,283			8,671			2,486			—			39			24,479
	Operating income (loss)	(423		)	(12,709		)	(9,473		)	(3,559		)	(3,476		)	(29,640		)
	Total assets	670,375			687,185			165,763			15,664			44,734			1,583,721
	Capital expenditures	6,533			7,495			220			—			63			14,311
	Three Months Ended June 30, 2013
	Revenues	$	139,337		$	—		$	23,162		$	—		$	—		$	162,499
	Depreciation, depletion, and amortization	12,804			—			2,551			—			42			15,397
	Operating income (loss)	12,572			—			4,837			(3,530		)	(1,904		)	11,975
	Total assets	699,556			—			183,855			16,305			33,887			933,603
	Capital expenditures	7,209			—			564			—			393			8,166
	Six Months Ended June 30, 2014
	Revenues	$	308,298		$	116,046		$	43,815		$	—		$	—		$	468,159
	Restructuring charges	491			6,646			499			—			305			7,941
	Depreciation, depletion, and amortization	26,780			8,671			5,009			—			78			40,538
	Operating income (loss)	12,275			(12,709		)	(7,731		)	(7,389		)	(6,034		)	(21,588		)
	Total assets	670,375			687,185			165,763			15,664			44,734			1,583,721
	Capital expenditures	9,586			7,495			255			—			25			17,361
	Six Months Ended June 30, 2013
	Revenues	$	281,449		$	—		$	42,498		$	—		$	—		$	323,947
	Depreciation, depletion, and amortization	24,658			—			5,081			—			84			29,823
	Operating income (loss)	25,566			—			3,836			(7,705		)	(3,987		)	17,710
	Total assets	699,556			—			183,855			16,305			33,887			933,603
	Capital expenditures	12,219			—			698			—			550			13,467
Reconciliation of segment operating income to income (loss)	'
	A reconciliation of segment income (loss) from operations to loss before income taxes follows:
		Three Months Ended June 30,						Six Months Ended June 30,
		2014			2013			2014			2013
		(In thousands)
	Income (loss) from operations	$	(29,640	)	$	11,975		$	(21,588	)	$	17,710
	Loss on extinguishment of debt	(12,635		)	(64		)	(12,635		)	(64		)
	Interest expense	(21,786		)	(10,076		)	(42,584		)	(20,236		)
	Interest income	1,582			280			1,884			577
	Gain (loss) on foreign exchange	2,649			—			(4,141		)	—
	Other income	483			130			576			198
	Income (loss) before income taxes	$	(59,347	)	$	2,245		$	(78,488	)	$	(1,815	)

SUPPLEMENTAL_CONSOLIDATING_FIN1

SUPPLEMENTAL CONSOLIDATING FINANCIAL INFORMATION (Tables)	6 Months Ended
	Jun. 30, 2014
Condensed Financial Information of Parent Company Only Disclosure [Abstract]	'
Supplemental Consolidating Balance Sheet Information	'
	CONSOLIDATING BALANCE SHEETS
	June 30, 2014
	(In thousands)
	Assets		Parent/				Co-Issuer				Guarantor				Non-				Consolidating				Total
			Issuer								Subsidiaries				Guarantor				Adjustments
															Subsidiaries
	Current assets:
	Cash and cash equivalents		$	13,514			$	415			$	24,440			$	2,241			$	—			$	40,610
	Receivables:
	Trade		—				12,940				116,712				—				—				129,652
	Loan and lease receivable		—				—				11,682				—				—				11,682
	Contractual third-party reclamation receivables		—				—				7,940				—				—				7,940
	Intercompany receivable/payable		132,824				32,639				(146,187		)		(19,275		)		(1		)		—
	Other		673				210				2,294				45				(40		)		3,182
			133,497				45,789				(7,559		)		(19,230		)		(41		)		152,456
	Inventories		—				5,319				147,834				1				—				153,154
	Deferred income taxes		5,370				—				683				—				—				6,053
	Other current assets		972				335				11,055				—				—				12,362
	Total current assets		153,353				51,858				176,453				(16,988		)		(41		)		364,635
	Property, plant and equipment:
	Land and mineral rights		—				1,395				437,606				—				—				439,001
	Plant and equipment		4,022				221,350				606,965				—				—				832,337
			4,022				222,745				1,044,571				—				—				1,271,338
	Less accumulated depreciation, depletion and amortization		2,863				76,662				406,295				—				—				485,820
	Net property, plant and equipment		1,159				146,083				638,276				—				—				785,518
	Loan and lease receivable		—				—				85,344				—				—				85,344
	Advanced coal royalties		—				—				7,134				—				—				7,134
	Reclamation deposits		—				—				75,911				—				—				75,911
	Restricted investments and bond collateral		63,322				—				41,189				—				—				104,511
	Contractual third-party reclamation receivables		—				—				93,956				—				—				93,956
	Investment in joint venture		—				—				33,273				—				—				33,273
	Intangible assets		—				460				217				—				—				677
	Investment in subsidiaries		480,871				—				—				3,770				(484,641		)		—
	Other assets		21,825				—				10,937				3,500				(3,500		)		32,762
	Total assets		$	720,530			$	198,401			$	1,162,690			$	(9,718	)		$	(488,182	)		$	1,583,721
	CONSOLIDATING BALANCE SHEETS
	June 30, 2014
	(In thousands)
	Liabilities and Shareholders’ Deficit		Parent/				Co-Issuer				Guarantor				Non-				Consolidating				Total
			Issuer								Subsidiaries				Guarantor				Adjustments
															Subsidiaries
	Current liabilities
	Current installments of long-term debt		$	—			$	—			$	42,401			$	—			$	—			$	42,401
	Accounts payable and accrued expenses:
	Trade and other accrued liabilities		5,240				7,996				114,423				684				(5		)		128,338
	Interest payable		30,315				—				474				—				(39		)		30,750
	Production taxes		—				1,081				38,936				2,657				(1		)		42,673
	Workers’ compensation		707				—				—				—				—				707
	Postretirement medical benefits		12,042				—				773				1,139				1				13,955
	SERP		390				—				—				—				—				390
	Deferred revenue		—				9,581				1,980				—				—				11,561
	Asset retirement obligations		—				—				31,131				—				—				31,131
	Other current liabilities		593				5,279				6,102				—				(1		)		11,973
	Total current liabilities		49,287				23,937				236,220				4,480				(45		)		313,879
	Long-term debt, less current installments		698,015				—				96,128				—				(3,500		)		790,643
	Workers’ compensation, less current portion		6,629				—				—				—				—				6,629
	Excess of black lung benefit obligation over trust assets		9,841				—				—				—				—				9,841
	Postretirement medical benefits, less current portion		184,902				—				68,766				18,105				—				271,773
	Pension and SERP obligations, less current portion		12,776				97				9,110				239				—				22,222
	Deferred revenue, less current portion		—				35,949				4,728				—				(1		)		40,676
	Asset retirement obligations, less current portion		—				927				357,326				—				—				358,253
	Intangible liabilities		—				5,072				—				—				—				5,072
	Deferred income taxes		5,370				—				10,144				—				—				15,514
Other liabilities		707				5,790				3,167				200				—				9,864
Intercompany receivable/payable		13,648				—				(13,849		)		14,654				(14,453		)		—
Total liabilities		981,175				71,772				771,740				37,678				(17,999		)		1,844,366
Shareholders’ deficit
Preferred stock		96				—				—				—				—				96
Common stock		38,173				5				110				132				(247		)		38,173
Other paid-in capital		133,140				52,848				441,269				(124		)		(493,993		)		133,140
Accumulated other comprehensive loss		(53,615		)		(160		)		16,075				(3,067		)		(12,848		)		(53,615		)
Accumulated earnings (deficit)		(378,439		)		73,936				(66,504		)		(44,337		)		36,905				(378,439		)
Total equity (deficit)		(260,645		)		126,629				390,950				(47,396		)		(470,183		)		(260,645		)
Total liabilities and shareholders’ deficit		$	720,530			$	198,401			$	1,162,690			$	(9,718	)		$	(488,182	)		$	1,583,721
CONSOLIDATING BALANCE SHEETS
December 31, 2013
(In thousands)
Assets		Parent/				Co-Issuer				Guarantor				Non-				Consolidating				Total
		Issuer								Subsidiaries				Guarantor				Adjustments
														Subsidiaries
Current assets:
Cash and cash equivalents		$	25,326			$	3,341			$	27,451			$	4,992			$	—			$	61,110
Receivables:
Trade		—				12,934				46,985				6,277				—				66,196
Contractual third-party reclamation receivables		—				—				8,487				—				—				8,487
Intercompany receivable/payable		(16,273		)		—				2,761				(19,353		)		32,865				—
Other		1,616				210				3,256				28				(24		)		5,086
		(14,657		)		13,144				61,489				(13,048		)		32,841				79,769
Inventories		—				6,161				33,811				—				—				39,972
Deferred income taxes		5,355				—				870				—				(870		)		5,355
Restricted investments and bond collateral		—				5,998				—				—				—				5,998
Other current assets		789				143				11,069				834				—				12,835
Total current assets		16,813				28,787				134,690				(7,222		)		31,971				205,039
Property, plant and equipment:
Land and mineral rights		—				1,395				276,793				—				—				278,188
Plant and equipment		3,973				220,872				432,851				—				—				657,696
		3,973				222,267				709,644				—				—				935,884
Less accumulated depreciation, depletion and amortization		2,707				71,653				371,488				—				—				445,848
Net property, plant and equipment		1,266				150,614				338,156				—				—				490,036
Advanced coal royalties		—				—				7,311				—				—				7,311
Reclamation deposits		—				—				74,921				—				—				74,921
Restricted investments and bond collateral		15,134				—				54,101				—				—				69,235
Contractual third-party reclamation receivables		—				—				88,303				—				—				88,303
Intangible assets		—				1,283				237				—				—				1,520
Investment in subsidiaries		280,843				—				—				3,770				(284,613		)		—
Other assets		8,636				—				1,683				2,000				(1,999		)		10,320
Total assets		$	322,692			$	180,684			$	699,402			$	(1,452	)		$	(254,641	)		$	946,685
CONSOLIDATING BALANCE SHEETS
December 31, 2013
(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			$	—			$	23,951			$	—			$	—			$	44,343
Accounts payable and accrued expenses:
Trade		6,840				10,119				38,061				2,487				—				57,507
Interest payable		11,302				—				40				—				(21		)		11,321
Production taxes		—				3				36,522				5,380				—				41,905
Workers’ compensation		717				—				—				—				—				717
Postretirement medical benefits		12,042				—				774				1,139				—				13,955
SERP		390				—				—				—				—				390
Deferred revenue		—				9,024				5,044				—				—				14,068
Asset retirement obligations		—				—				23,353				—				—				23,353
Other current liabilities		—				5,053				417				—				(1		)		5,469
Total current liabilities		51,683				24,199				128,162				9,006				(22		)		213,028
Long-term debt, less current installments		224,582				—				72,912				—				(2,000		)		295,494
Workers’ compensation, less current portion		6,744				—				—				—				—				6,744
Excess of black lung benefit obligation over trust assets		8,675				—				—				—				—				8,675
Postretirement medical benefits, less current portion		185,858				—				66,439				18,077				—				270,374
Pension and SERP obligations, less current portion		13,069				99				10,765				243				—				24,176
Deferred revenue, less current portion		—				41,297				5,270				—				—				46,567
Asset retirement obligations, less current portion		—				892				255,619				—				—				256,511
Intangible liabilities		—				5,606				—				—				—				5,606
Deferred income taxes		5,355				—				—				—				—				5,355
Other liabilities		584				—				6,687				983				(6,220		)		2,034
Intercompany receivable/payable		14,021				—				(7,851		)		14,654				(20,824		)		—
Total liabilities		510,571				72,093				538,003				42,963				(29,066		)		1,134,564
Shareholders’ deficit
Preferred stock		160				—				—				—				—				160
Common stock		36,479				5				110				132				(247		)		36,479
Other paid-in capital		134,861				52,835				157,984				(124		)		(210,695		)		134,861
Accumulated other comprehensive loss		(63,595		)		(164		)		6,425				(3,086		)		(3,175		)		(63,595		)
Accumulated earnings (deficit)		(295,784		)		55,915				(3,120		)		(41,337		)		(11,458		)		(295,784		)
Total equity (deficit)		(187,879		)		108,591				161,399				(44,415		)		(225,575		)		(187,879		)
Total liabilities and shareholders’ deficit		$	322,692			$	180,684			$	699,402			$	(1,452	)		$	(254,641	)		$	946,685
Supplemental Consolidating Statement of Operations Information	'
	CONSOLIDATING STATEMENTS OF OPERATIONS
	Three Months Ended June 30, 2014
	(In thousands)
		Parent/				Co-Issuer				Guarantor				Non-Guarantor				Consolidating				Total
		Issuer								Subsidiaries				Subsidiaries				Adjustments
	Revenues	$	—			$	21,803			$	266,153			$	—			$	—			$	287,956
	Costs and expenses:
	Cost of sales	(247		)		21,592				227,044				—				—				248,389
	Depreciation, depletion and amortization	79				2,485				21,915				—				—				24,479
	Selling and administrative	12,003				1,169				15,921				(384		)		—				28,709
	Heritage health benefit expenses	3,178				—				—				210				—				3,388
	Gain on sales of assets	—				—				(43		)		—				—				(43		)
	Restructuring charges	796				101				6,646				—				—				7,543
	Derivative loss	—				5,930				—				—				—				5,930
	Income from equity affiliates	—				—				(799		)		—				—				(799		)
		15,809				31,277				270,684				(174		)		—				317,596
	Operating income (loss)	(15,809		)		(9,474		)		(4,531		)		174				—				(29,640		)
	Other income (expense):
	Interest expense	(18,609		)		(74		)		(3,111		)		(1		)		9				(21,786		)
	Loss on extinguishment of debt	(63		)		—				(12,571		)		(1		)		—				(12,635		)
	Interest income	145				4				1,433				—				—				1,582
	Gain on foreign exchange	1,557				—				1,092				—				—				2,649
	Other income	—				—				483				—				—				483
		(16,970		)		(70		)		(12,674		)		(2		)		9				(29,707		)
	Income (loss) before income taxes and income of consolidated subsidiaries	(32,779		)		(9,544		)		(17,205		)		172				9				(59,347		)
	Equity in income of subsidiaries	(30,462		)		—				—				—				30,462				—
	Income (loss) before income taxes	(63,241		)		(9,544		)		(17,205		)		172				30,471				(59,347		)
	Income tax expense (benefit)	(87		)		—				(74		)		1				3,967				3,807
	Net income (loss)	(63,154		)		(9,544		)		(17,131		)		171				26,504				(63,154		)
	Less net loss attributable to noncontrolling interest	—				—				—				—				—				—
	Net income (loss) attributable to the Parent company	$	(63,154	)		$	(9,544	)		$	(17,131	)		$	171			$	26,504			$	(63,154	)
	CONSOLIDATING STATEMENTS OF OPERATIONS
	Three Months Ended June 30, 2013
	(In thousands)
		Parent/				Co-Issuer				Guarantor				Non-Guarantor				Consolidating				Total
		Issuer								Subsidiaries				Subsidiaries				Adjustments
	Revenues	$	—			$	23,162			$	134,449			$	9,538			$	(4,650	)		$	162,499
	Costs and expenses:
	Cost of sales	(372		)		14,901				113,640				7,009				(4,650		)		130,528
	Depreciation, depletion and amortization	94				2,551				12,753				—				(1		)		15,397
	Selling and administrative	4,259				872				7,232				(394		)		—				11,969
	Heritage health benefit expenses	2,844				—				—				265				—				3,109
	Gain on sales of assets	—				—				(74		)		—				—				(74		)
	Other operating income	—				—				(10,405		)		—				—				(10,405		)
		6,825				18,324				123,146				6,880				(4,651		)		150,524
	Operating income (loss)	(6,825		)		4,838				11,303				2,658				1				11,975
	Other income (expense):
	Interest expense	(7,591		)		(10		)		(2,479		)		(5		)		9				(10,076		)
	Loss on extinguishment of debt	(64		)		—				—				—				—				(64		)
	Interest income	46				5				232				6				(9		)		280
	Other income (loss)	2				—				130				(2		)		—				130
		(7,607		)		(5		)		(2,117		)		(1		)		—				(9,730		)
	Income (loss) before income taxes and income of consolidated subsidiaries	(14,432		)		4,833				9,186				2,657				1				2,245
	Equity in income of subsidiaries	16,648				—				—				—				(16,648		)		—
	Income (loss) before income taxes	2,216				4,833				9,186				2,657				(16,647		)		2,245
	Income tax expense (benefit)	(1		)		—				1,139				—				(1,110		)		28
	Net income (loss)	2,217				4,833				8,047				2,657				(15,537		)		2,217
	Less net loss attributable to noncontrolling interest	2,499				—				—				—				—				2,499
	Net income (loss) attributable to the Parent company	$	(282	)		$	4,833			$	8,047			$	2,657			$	(15,537	)		$	(282	)
	CONSOLIDATING STATEMENTS OF OPERATIONS
	Six Months Ended June 30, 2014
	(In thousands)
		Parent/				Co-Issuer				Guarantor				Non-Guarantor				Consolidating				Total
Issuer			Subsidiaries							Subsidiaries				Adjustments
Revenues	$	—			$	43,815			$	424,351			$	(7	)		$	—			$	468,159
Costs and expenses:
Cost of sales	(471		)		38,046				349,389				55				—				387,019
Depreciation, depletion and amortization	156				5,009				35,373				—				—				40,538
Selling and administrative	16,968				2,062				23,783				(773		)		—				42,040
Heritage health benefit expenses	6,504				—				—				428				—				6,932
Gain on sales of assets	—				—				(5		)		—				—				(5		)
Restructuring charges	796				499				6,646				—				—				7,941
Derivative loss	—				5,930				—				—				—				5,930
Equity in net income of unconsolidated affiliates	—				—				(799		)		—				—				(799		)
Other operating income	—				—				150				1				—				151
	23,953				51,546				414,537				(289		)		—				489,747
Operating income (loss)	(23,953		)		(7,731		)		9,814				282				—				(21,588		)
Other income (expense):
Interest expense	(37,282		)		(118		)		(5,199		)		—				15				(42,584		)
Loss on extinguishment of debt	(62		)		—				(12,572		)		(1		)		—				(12,635		)
Interest income	269				7				1,608				15				(15		)		1,884
Gain (loss) on foreign exchange	(5,233		)		—				1,092				—				—				(4,141		)
Other income	—				—				576				—				—				576
	(42,308		)		(111		)		(14,495		)		14				—				(56,900		)
Income (loss) before income taxes and income of consolidated subsidiaries	(66,261		)		(7,842		)		(4,681		)		296				—				(78,488		)
Equity in income of subsidiaries	(16,148		)		—				—				—				16,148				—
Income (loss) before income taxes	(82,409		)		(7,842		)		(4,681		)		296				16,148				(78,488		)
Income tax expense (benefit)	(224		)		—				5,041				—				(1,120		)		3,697
Net income (loss)	(82,185		)		(7,842		)		(9,722		)		296				17,268				(82,185		)
Less net loss attributable to noncontrolling interest	—				—				—				—				—				—
Net income (loss) attributable to the Parent company	$	(82,185	)		$	(7,842	)		$	(9,722	)		$	296			$	17,268			$	(82,185	)
CONSOLIDATING STATEMENTS OF OPERATIONS
Six Months Ended June 30, 2013
(In thousands)
	Parent/				Co-Issuer				Guarantor				Non-Guarantor				Consolidating				Total
	Issuer								Subsidiaries				Subsidiaries				Adjustments
Revenues	$	—			$	42,498			$	274,187			$	20,889			$	(13,627	)		$	323,947
Costs and expenses:
Cost of sales	(770		)		31,856				223,417				20,073				(13,627		)		260,949
Depreciation, depletion and amortization	187				5,082				24,554				—				—				29,823
Selling and administrative	8,207				1,726				14,680				(758		)		—				23,855
Heritage health benefit expenses	6,533				—				—				527				—				7,060
Gain on sales of assets	—				—				(308		)		—				—				(308		)
Other operating income	—				—				(15,142		)		—				—				(15,142		)
	14,157				38,664				247,201				19,842				(13,627		)		306,237
Operating income (loss)	(14,157		)		3,834				26,986				1,047				—				17,710
Other income (expense):
Interest expense	(15,175		)		(20		)		(5,048		)		(10		)		17				(20,236		)
Loss on extinguishment of debt	(64		)		—				—				—				—				(64		)
Interest income	76				15				493				10				(17		)		577
Other income (loss)	—				—				200				(2		)		—				198
	(15,163		)		(5		)		(4,355		)		(2		)		—				(19,525		)
Income (loss) before income taxes and income of consolidated subsidiaries	(29,320		)		3,829				22,631				1,045				—				(1,815		)
Equity in income of subsidiaries	27,450				—				—				—				(27,450		)		—
Income (loss) before income taxes	(1,870		)		3,829				22,631				1,045				(27,450		)		(1,815		)
Income tax expense (benefit)	—				—				4,458				—				(4,403		)		55
Net income (loss)	(1,870		)		3,829				18,173				1,045				(23,047		)		(1,870		)
Less net loss attributable to noncontrolling interest	797				—				—				—				—				797
Net income (loss) attributable to the Parent company	$	(2,667	)		$	3,829			$	18,173			$	1,045			$	(23,047	)		$	(2,667	)
Supplemental Consolidating Statements of Comprehensive Income (Loss)	'
	CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS)
	Three Months Ended June 30, 2014
	(In thousands)
		Parent/Issuer				Co-Issuer				Guarantor				Non-Guarantor				Consolidating				Total
										Subsidiaries				Subsidiaries				Adjustments
	Net income (loss)	$	(63,154	)		$	(9,544	)		$	(17,131	)		$	171			$	26,504			$	(63,154	)
	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
	Tax effect of other comprehensive income gains	64				—				—				—				—				64
	Change in foreign currency translation adjustment	9,477				—				9,477				—				(9,477		)		9,477
	Other comprehensive income (loss)	9,905				2				9,563				11				(9,576		)		9,905
	Comprehensive income (loss) attributable to the Parent company	$	(53,249	)		$	(9,542	)		$	(7,568	)		$	182			$	16,928			$	(53,249	)
	CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS)
	Three Months Ended June 30, 2013
	(In thousands)
		Parent/Issuer				Co-Issuer				Guarantor				Non-Guarantor				Consolidating				Total
										Subsidiaries				Subsidiaries				Adjustments
	Net income (loss)	$	2,217			$	4,833			$	8,047			$	2,657			$	(15,537	)		$	2,217
	Other comprehensive income (loss)
	Amortization of accumulated actuarial gains or losses, pension	1,004				8				239				—				(247		)		1,004
	Amortization of accumulated actuarial gains or losses, transition obligations, and prior service costs, postretirement medical benefit	1,001				—				214				—				(214		)		1,001
	Unrealized and realized gains and losses on available-for-sale securities	(39		)		—				(40		)		—				40				(39		)
	Other comprehensive income (loss)	1,966				8				413				—				(421		)		1,966
	Comprehensive income (loss) attributable to the Parent company	$	4,183			$	4,841			$	8,460			$	2,657			$	(15,958	)		$	4,183
	CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS)
	Six Months Ended June 30, 2014
	(In thousands)
		Parent/Issuer				Co-Issuer				Guarantor				Non-Guarantor				Consolidating				Total
										Subsidiaries				Subsidiaries				Adjustments
	Net income (loss)	$	(82,185	)		$	(7,842	)		$	(9,722	)		$	296			$	17,268			$	(82,185	)
	Other comprehensive income (loss)
	Amortization of accumulated actuarial gains or losses, pension	717				4				244				11				(259		)		717
	Amortization of accumulated actuarial gains or losses, transition obligations, and prior service costs, postretirement medical benefit	10				—				(72		)		10				62				10
	Tax effect of other comprehensive income gains	(224		)		—				—				—				—				(224		)
	Change in foreign currency translation adjustment	9,477				—				9,477				—				(9,477		)		9,477
	Other comprehensive income (loss)	9,980				4				9,649				21				(9,674		)		9,980
	Comprehensive income (loss) attributable to the Parent company	$	(72,205	)		$	(7,838	)		$	(73	)		$	317			$	7,594			$	(72,205	)
	CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS)
	Six Months Ended June 30, 2013
	(In thousands)
		Parent/Issuer				Co-Issuer				Guarantor				Non-Guarantor				Consolidating				Total
										Subsidiaries				Subsidiaries				Adjustments
	Net income (loss)	$	(1,870	)		$	3,829			$	18,173			$	1,045			$	(23,047	)		$	(1,870	)
	Other comprehensive income (loss)
	Amortization of accumulated actuarial gains or losses, pension	1,745				14				432				—				(446		)		1,745
	Amortization of accumulated actuarial gains or losses, transition obligations, and prior service costs, postretirement medical benefit	2,002				—				427				—				(427		)		2,002
	Unrealized and realized gains and losses on available-for-sale securities	(39		)		—				(40		)		—				40				(39		)
	Other comprehensive income (loss)	3,708				14				819				—				(833		)		3,708
	Comprehensive income (loss) attributable to the Parent company	$	1,838			$	3,843			$	18,992			$	1,045			$	(23,880	)		$	1,838
Supplemental Consolidating Statement of Cash Flow Information	'
	CONSOLIDATING STATEMENTS OF CASH FLOWS
	Six Months Ended June 30, 2014
	(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)		$	(82,185	)		$	(7,842	)		$	(9,722	)		$	296			$	17,268			$	(82,185	)
	Adjustments to reconcile net income (loss) to net cash provided by operating activities:
	Equity in income of subsidiaries		16,148				—				—				—				(16,148		)		—
	Depreciation, depletion, and amortization		156				5,009				35,373				—				—				40,538
	Accretion of asset retirement obligation and receivable		—				34				9,254				—				—				9,288
	Non-cash tax benefits		(224		)		—				—				—				—				(224		)
	Amortization of intangible assets and liabilities, net		—				290				20				—				—				310
	Share-based compensation		1,934				14				497				—				—				2,445
	Gain on sales of assets		—				—				(5		)		—				—				(5		)
	Amortization of deferred financing costs		494				—				715				—				—				1,209
	Loss on extinguishment of debt		62				—				12,572				1				—				12,635
	Loss on sales of investment securities		—				—				3				—				—				3
	Loss on derivative		—				5,930				—				—				—				5,930
	Loss on foreign exchange		5,233				—				(1,092		)		—				—				4,141
	Income from equity affiliates		—				—				(799		)		—				—				(799		)
	Distributions from equity affiliates		—				—				730				—				—				730
	Changes in operating assets and liabilities:
	Receivables, net		943				(6		)		(18,474		)		4,733				1,534				(11,270		)
	Inventories		—				842				21,929				(1		)		—				22,770
	Excess of black lung benefit obligation over trust assets		1,166				—				—				—				—				1,166
	Deferred income tax		—				—				3,854				—				—				3,854
	Accounts payable and accrued expenses		17,348				(1,101		)		(3,164		)		(4,526		)		(19		)		8,538
	Deferred revenue		—				(4,791		)		(3,633		)		—				—				(8,424		)
	Income tax payable		—				—				528				—				—				528
	Accrual for workers’ compensation		(125		)		—				—				—				—				(125		)
	Asset retirement obligations		—				—				(3,364		)		2				—				(3,362		)
	Accrual for postretirement medical benefits		(885		)		—				2,256				38				—				1,409
	Pension and SERP obligations		166				2				(507		)		7				—				(332		)
	Other assets and liabilities		(7,429		)		(273		)		4,113				(1,193		)		6,587				1,805
	Distributions received from subsidiaries		76,800				—				—				—				(76,800		)		—
	Net cash provided by (used in) operating activities		29,602				(1,892		)		51,084				(643		)		(67,578		)		10,573
	Cash flows from investing activities:
	Additions to property, plant and equipment		16				(255		)		(17,122		)		—				—				(17,361		)
	Change in restricted investments and bond collateral and reclamation deposits		(48,188		)		5,998				11,673				—				—				(30,517		)
	Cash payments related to Canadian acquisition		(282,788		)		—				(39,849		)		—				—				(322,637		)
	Cash acquired related to Canadian acquisition		—				—				8,103				—				—				8,103
	Net proceeds from sales of assets		—				—				213				—				—				213
	Proceeds from the sale of investments		—				—				246				—				—				246
	Increase in loan and lease receivable		—				—				(1,120		)		—				—				(1,120		)
	Receipts from loan and lease receivable		—				—				2,164				—				—				2,164
	Receivable from customer for property and equipment purchases		—				—				—				—				—				—
	Other		—				—				(82		)		—				—				(82		)
	Net cash provided by (used in) investing activities		(330,960		)		5,743				(35,774		)		—				—				(360,991		)
	Cash flows from financing activities:
	Change in book overdrafts		—				—				1,605				—				—				1,605
	Borrowings from long-term debt		454,219				—				—				—				—				454,219
	Repayments of long-term debt		(1,015		)		—				(96,523		)		—				—				(97,538		)
	Borrowings on revolving lines of credit		—				—				10,000				—				—				10,000
	Repayments on revolving lines of credit		—				—				(10,000		)		—				—				(10,000		)
	Debt issuance costs and other refinancing costs		(15,407		)		—				(11,646		)		—				—				(27,053		)
	Dividends/distributions		(470		)		(8,500		)		(68,300		)		—				76,800				(470		)
	Exercise of stock options		193				—				—				—				—				193
	Transactions with Parent/affiliates		(147,974		)		1,723				157,581				(2,108		)		(9,222		)		—
	Net cash provided by (used in) financing activities		289,546				(6,777		)		(17,283		)		(2,108		)		67,578				330,956
	Effect of foreign exchange rates on cash		—				—				(1,038		)		—				—				(1,038		)
	Net decrease in cash and cash equivalents		(11,812		)		(2,926		)		(3,011		)		(2,751		)		—				(20,500		)
	Cash and cash equivalents, beginning of period		25,326				3,341				27,451				4,992				—				61,110
Cash and cash equivalents, end of period		$	13,514			$	415			$	24,440			$	2,241			$	—			$	40,610
CONSOLIDATING STATEMENTS OF CASH FLOWS
Six Months Ended June 30, 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)		$	(1,870	)		$	3,829			$	18,173			$	1,045			$	(23,047	)		$	(1,870	)
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Equity in income of subsidiaries		(27,450		)		—				—				—				27,450				—
Depreciation, depletion, and amortization		187				5,082				24,554				—				—				29,823
Accretion of asset retirement obligation and receivable		—				32				6,305				1				—				6,338
Amortization of intangible assets and liabilities, net		—				312				19				(5		)		—				326
Share-based compensation		1,567				23				2,181				—				—				3,771
Gain on sales of assets		—				—				(308		)		—				—				(308		)
Amortization of deferred financing costs		1,541				—				315				—				—				1,856
Loss on extinguishment of debt		64				—				—				—				—				64
Loss on sales of investment securities		—				—				(28		)		—				—				(28		)
Changes in operating assets and liabilities:
Receivables, net		(227		)		(1,995		)		4,419				(239		)		1,729				3,687
Inventories		—				(1,632		)		(345		)		—				—				(1,977		)
Excess of black lung benefit obligation over trust assets		(280		)		—				—				(1		)		—				(281		)
Accounts payable and accrued expenses		(1,957		)		4,101				904				(1,146		)		(201		)		1,701
Deferred revenue		—				(4,190		)		(2,025		)		1				—				(6,214		)
Income tax payable		—				—				(55		)		(1		)		—				(56		)
Accrual for workers’ compensation		(284		)		—				—				—				—				(284		)
Asset retirement obligations		—				—				(5,422		)		(2		)		—				(5,424		)
Accrual for postretirement medical benefits		(40		)		—				4,010				124				—				4,094
Pension and SERP obligations		695				9				826				(13		)		—				1,517
Other assets and liabilities		(49		)		101				(1,489		)		(374		)		—				(1,811		)
Distributions received from subsidiaries		36,600				—				—				—				(36,600		)		—
Net cash provided by (used in) operating activities		8,497				5,672				52,034				(610		)		(30,669		)		34,924
Cash flows from investing activities:
Additions to property, plant and equipment		(575		)		(698		)		(12,189		)		(4		)		(1		)		(13,467		)
Change in restricted investments and bond collateral and reclamation deposits		(807		)		(5		)		(7,902		)		—				—				(8,714		)
Net proceeds from sales of assets		—				—				577				—				—				577
Proceeds from the sale of investments		—				—				6,807				—				—				6,807
Receivable from customer for property and equipment purchases		—				—				(307		)		(1		)		—				(308		)
Net cash used in investing activities		(1,382		)		(703		)		(13,014		)		(5		)		(1		)		(15,105		)
Cash flows from financing activities:
Change in book overdrafts		—				—				1,777				—				—				1,777
Repayments of long-term debt		(500		)		—				(15,561		)		(9		)		—				(16,070		)
Borrowings on revolving lines of credit		—				—				6,000				—				—				6,000
Repayments on revolving lines of credit		—				—				(6,000		)		—				—				(6,000		)
Debt issuance costs and other refinancing costs		(26		)		—				(156		)		—				—				(182		)
Dividends/distributions		(680		)		(9,000		)		(27,600		)		—				36,600				(680		)
Transactions with Parent/affiliates		(5,080		)		(38		)		8,699				2,349				(5,930		)		—
Net cash provided by (used in) financing activities		(6,286		)		(9,038		)		(32,841		)		2,340				30,670				(15,155		)
Net increase (decrease) in cash and cash equivalents		829				(4,069		)		6,179				1,725				—				4,664
Cash and cash equivalents, beginning of period		14,836				4,545				10,237				1,992				—				31,610
Cash and cash equivalents, end of period		$	15,665			$	476			$	16,416			$	3,717			$	—			$	36,274

BASIS_OF_PRESENTATION_Business

BASIS OF PRESENTATION - Business Operations (Details)	0 Months Ended	6 Months Ended
	Apr. 28, 2014	Jun. 30, 2014
	mines	mines
Canadian Acquisition	'	'
Business Acquisition [Line Items]	'	'
Number of mines	6	6
PMRU	'	'
Business Acquisition [Line Items]	'	'
Number of mines	'	5
Corporate Joint Venture [Member] | Canadian Acquisition	'	'
Business Acquisition [Line Items]	'	'
Ownership percentage in joint venture	'	50.00%
Corporate Joint Venture [Member] | PMRU	'	'
Business Acquisition [Line Items]	'	'
Ownership percentage in joint venture	'	50.00%

BASIS_OF_PRESENTATION_Addition

BASIS OF PRESENTATION - Additional Information (Details) (USD $)	3 Months Ended		6 Months Ended			6 Months Ended
In Millions, unless otherwise specified	Jun. 30, 2014	Dec. 31, 2013	Jun. 30, 2014	Jun. 30, 2014	Jun. 30, 2014	Jun. 30, 2013
			PMRU	PMRU	Senior secured notes	Other operating income
			Minimum	Maximum
Debt Instrument [Line Items]	'	'	'	'	'	'
Debt arrangement	'	'	'	'	$675.50	'
Stated interest rate (percent)	'	'	'	'	10.75%	'
Business interruption insurance proceeds recorded in income	'	'	'	'	'	11.3
Cash proceeds from business interruption insurance	4.6	'	'	'	'	'
Finance income, recognition period	'	'	'3 years	'27 years	'	'
Liability for unrecognized tax benefits	$5.80	$0	'	'	'	'

ACQUISITION_Narrative_Details

ACQUISITION - Narrative (Details) (USD $)

0 Months Ended

3 Months Ended

6 Months Ended

0 Months Ended

2 Months Ended

3 Months Ended

6 Months Ended

6 Months Ended

Apr. 28, 2014

Jun. 30, 2014

Jun. 30, 2013

Jun. 30, 2014

Jun. 30, 2013

Apr. 28, 2014

Jun. 25, 2014

Apr. 28, 2014

Dec. 24, 2013

Jun. 30, 2014

Jun. 30, 2014

Jun. 30, 2014

Apr. 28, 2014

Dec. 31, 2013

Jun. 30, 2014

Apr. 28, 2014

Apr. 28, 2014

Apr. 28, 2014

Apr. 28, 2014

Jun. 30, 2014

Jun. 30, 2014

Jun. 30, 2014

Jun. 30, 2014

Jun. 30, 2014

Canadian Acquisition

Canadian Acquisition

Canadian Acquisition

Canadian Acquisition

Canadian Acquisition

Canadian Acquisition

Canadian Acquisition

Canadian Acquisition

Senior Notes

Senior Notes

Term Debt

Revolving Credit Facility

Revolving Credit Facility

Cost of Sales - Inventory

Selling and Administrative Costs

Foreign Exchange

Interest Expense

PMRU

mines

mines

T

Canadian Acquisition

Canadian Acquisition

Canadian Acquisition

Canadian Acquisition

Canadian Acquisition

Canadian Acquisition

Canadian Acquisition

mines

T

Business Acquisition [Line Items]

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Number of mines

'

'

'

'

'

'

'

6

'

'

'

6

'

'

'

'

'

'

'

'

'

'

'

5

Voting interests acquired (percent)

'

'

'

'

'

'

'

'

'

'

'

'

50.00%

'

'

'

'

'

'

'

'

'

'

'

Proven or probable coal reserves

'

'

'

'

'

'

'

'

'

'

'

'

'

649,000,000

'

'

'

'

'

'

'

'

'

'

Cash paid

'

'

'

$322,637,000

$0

'

$39,800,000

$282,800,000

$283,000,000

'

$322,600,000

'

'

'

'

'

'

'

'

'

'

'

'

'

Assumed liabilities

'

'

'

'

'

330,500,000

'

'

'

'

'

'

330,500,000

'

'

'

'

'

'

'

'

'

'

'

Aggregate principal amount

'

'

'

'

'

'

'

'

'

'

'

'

'

'

675,500,000

425,000,000

'

'

'

'

'

'

'

'

Stated interest rate (percent)

'

'

'

'

'

'

'

'

'

'

'

'

'

'

10.75%

10.75%

8.02%

'

'

'

'

'

'

'

Acquisition related costs

'

'

'

'

'

'

'

'

'

'

'

31,600,000

'

'

'

'

'

'

'

13,600,000

6,900,000

6,200,000

4,900,000

'

Maximum borrowing capacity

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

60,000,000

60,000,000

'

'

'

'

'

Cash and cash equivalents

'

'

'

'

'

26,200,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Payment of assumed liability

18,100,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Net cash received upon acquisition

'

'

'

'

'

8,100,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Revenues

'

287,956,000

162,499,000

468,159,000

323,947,000

'

'

'

'

116,000,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Income (loss) from operations

'

($29,640,000)

$11,975,000

($21,588,000)

$17,710,000

'

'

'

'

($12,700,000)

'

'

'

'

'

'

'

'

'

'

'

'

'

'

ACQUISITION_Summary_of_purchas

ACQUISITION - Summary of purchase consideration and allocation of purchase consideration (Details) (USD $)	6 Months Ended			0 Months Ended			3 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Apr. 28, 2014	Jun. 25, 2014	Apr. 28, 2014	Dec. 24, 2013	Jun. 30, 2014	Apr. 28, 2014
				Canadian Acquisition	Canadian Acquisition	Canadian Acquisition	Canadian Acquisition	Canadian Acquisition
Purchase Price:	'	'	'	'	'	'	'	'
Cash paid	$322,637,000	$0	'	$39,800,000	$282,800,000	$283,000,000	$322,600,000	'
Assets:	'	'	'	'	'	'	'	'
Cash and cash equivalents	'	'	26,200,000	'	'	'	'	'
Trade receivables	'	'	49,900,000	'	'	'	'	'
Inventories - materials and supplies	'	'	52,000,000	'	'	'	'	'
Inventories - coal	'	'	79,800,000	'	'	'	'	'
Leases and loans receivable	'	'	11,200,000	'	'	'	'	'
Deferred tax assets	'	'	6,700,000	'	'	'	'	'
Other current assets	'	'	3,400,000	'	'	'	'	'
Total current assets	'	'	229,200,000	'	'	'	'	'
Land and mineral rights	'	'	151,300,000	'	'	'	'	'
Plant and equipment	'	'	171,700,000	'	'	'	'	'
Leases and loans receivable	'	'	83,800,000	'	'	'	'	'
Contractual third-party reclamation receivables, less current portion	'	'	6,800,000	'	'	'	'	'
Other assets	'	'	10,300,000	'	'	'	'	'
Total Assets	'	'	653,100,000	'	'	'	'	'
Liabilities:	'	'	'	'	'	'	'	'
Current installments of long-term debt	'	'	-36,300,000	'	'	'	'	'
Asset retirement obligations	'	'	-93,700,000	'	'	'	'	'
Asset retirement obligations	'	'	-9,700,000	'	'	'	'	'
Total current liabilities	'	'	-139,700,000	'	'	'	'	'
Long-term debt, less current installments	'	'	-86,300,000	'	'	'	'	'
Asset retirement obligations, less current portion	'	'	-92,400,000	'	'	'	'	'
Deferred tax liabilities	'	'	-12,100,000	'	'	'	'	'
Total Liabilities	'	'	-330,500,000	'	'	'	'	-330,500,000
Net fair value	'	'	$322,600,000	'	'	'	'	'

ACQUISITION_Summary_of_Pro_For

ACQUISITION - Summary of Pro Forma Information (Details) (USD $)	3 Months Ended		6 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Total Revenues	'	'	'	'
As reported	$287,956	$162,499	$468,159	$323,947
Pro forma	320,761	356,962	674,378	672,735
Operating Income	'	'	'	'
As reported	-29,640	11,975	-21,588	17,710
Pro forma	-50,032	17,081	-14,433	30,105
Net loss applicable to common shareholders	'	'	'	'
As reported	-63,363	-622	-82,655	-3,347
Pro forma	($89,247)	($4,167)	($97,509)	($9,131)
Net loss per share applicable to common shareholders	'	'	'	'
As reported (in USD per share)	($4.19)	($0.04)	($5.52)	($0.23)
Pro forma (in USD per share)	($5.90)	($0.29)	($6.52)	($0.63)

INVENTORIES_Detail

INVENTORIES (Detail) (USD $)	Jun. 30, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Inventory Disclosure [Abstract]	'	'
Coal stockpiles	$61,663	$543
Coal fuel inventories	5,319	6,161
Materials and supplies	86,946	34,233
Reserve for obsolete inventory	-774	-965
Total	$153,154	$39,972

RESTRICTED_INVESTMENTS_AND_BON2

RESTRICTED INVESTMENTS AND BOND COLLATERAL - Components of Restricted Investments and Bond Collateral (Detail) (USD $)	Jun. 30, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Restricted Investments and Bond Collateral [Line Items]	'	'
Total restricted investments and bond collateral	$104,511	$75,233
Less current portion	0	-5,998
Total restricted investments and bond collateral, less current portion	104,511	69,235
Coal - Canada Segment | CVRI	'	'
Restricted Investments and Bond Collateral [Line Items]	'	'
Total restricted investments and bond collateral	31,867	0
Coal - Canada Segment | PMRU	'	'
Restricted Investments and Bond Collateral [Line Items]	'	'
Total restricted investments and bond collateral	16,201	0
Debt Reserve Account | Coal - U.S. Segment	'	'
Restricted Investments and Bond Collateral [Line Items]	'	'
Total restricted investments and bond collateral	0	13,067
Reclamation Bond Collateral | Coal - U.S. Segment | Kemmerer Mine	'	'
Restricted Investments and Bond Collateral [Line Items]	'	'
Total restricted investments and bond collateral	25,077	24,966
Reclamation Bond Collateral | Coal - U.S. Segment | Absaloka Mine	'	'
Restricted Investments and Bond Collateral [Line Items]	'	'
Total restricted investments and bond collateral	11,696	11,653
Reclamation Bond Collateral | Coal - U.S. Segment | Rosebud Mine	'	'
Restricted Investments and Bond Collateral [Line Items]	'	'
Total restricted investments and bond collateral	3,145	3,145
Reclamation Bond Collateral | Coal - U.S. Segment | Beulah Mine	'	'
Restricted Investments and Bond Collateral [Line Items]	'	'
Total restricted investments and bond collateral	1,270	1,270
Letter of Credit Account | Power Segment	'	'
Restricted Investments and Bond Collateral [Line Items]	'	'
Total restricted investments and bond collateral	0	5,998
Postretirement Medical Benefit Bonds | Corporate Segment	'	'
Restricted Investments and Bond Collateral [Line Items]	'	'
Total restricted investments and bond collateral	8,550	8,467
Workers' Compensation Bonds | Corporate Segment	'	'
Restricted Investments and Bond Collateral [Line Items]	'	'
Total restricted investments and bond collateral	$6,705	$6,667

RESTRICTED_INVESTMENTS_AND_BON3

RESTRICTED INVESTMENTS AND BOND COLLATERAL - Carrying Value and Estimated Fair Value of Restricted Investments and Bond Collateral (Detail) (USD $)	Jun. 30, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Investment [Line Items]	'	'
Restricted investments and bond collateral	$104,511	$69,235
Carrying Value	'	'
Investment [Line Items]	'	'
Cash and cash equivalents	67,340	'
Time deposits	2,451	'
Held-to-maturity securities	34,720	'
Restricted investments and bond collateral	104,511	'
Fair Value	'	'
Investment [Line Items]	'	'
Cash and cash equivalents	67,340	'
Time deposits	2,451	'
Held-to-maturity securities	35,259	'
Restricted investments and bond collateral	$105,050	'

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 $)	Jun. 30, 2014
In Thousands, unless otherwise specified
Held-to-maturity securities	'
Schedule of Held-to-maturity Securities [Line Items]	'
Amortized cost	$34,720
Gross unrealized holding gains	628
Gross unrealized holding losses	-89
Fair value	$35,259

RESTRICTED_INVESTMENTS_AND_BON5

RESTRICTED INVESTMENTS AND BOND COLLATERAL - Maturities of Held-to-Maturity Securities (Detail) (Held-to-maturity securities, USD $)	Jun. 30, 2014
In Thousands, unless otherwise specified
Held-to-maturity securities	'
Schedule of Held-to-maturity Securities [Line Items]	'
Within one year, Amortized cost	$1,212
Due in five years or less, Amortized cost	19,360
Due after five years to ten years, Amortized cost	8,897
Due in more than ten years, Amortized cost	5,251
Maturities of held-to-maturity securities, Amortized cost	34,720
Within one year, Fair Value	1,230
Due in five years or less, Fair Value	19,704
Due after five years to ten years, Fair Value	9,070
Due in more than ten years, Fair Value	5,255
Fair value	$35,259

RESTRUCTURING_CHARGES_Details

RESTRUCTURING CHARGES (Details) (USD $)	3 Months Ended		6 Months Ended		3 Months Ended	6 Months Ended	12 Months Ended	6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2014	Dec. 31, 2013	Jun. 30, 2014
					ROVA I and ROVA II Contracts	ROVA I and ROVA II Contracts	ROVA I and ROVA II Contracts	Canadian Acquisition
Restructuring Cost and Reserve [Line Items]	'	'	'	'	'	'	'	'
Remaining Period of Contract	'	'	'	'	'	'	'5 years	'
Restructuring Reserve [Roll Forward]	'	'	'	'	'	'	'	'
Beginning balance	'	'	'	'	'	$5,100,000	'	$0
Restructuring charges	7,543,000	0	7,941,000	0	100,000	500,000	'	8,000,000
Restructuring payments	'	'	'	'	'	500,000	'	400,000
Ending balance	'	'	'	'	$5,100,000	$5,100,000	$5,100,000	$7,600,000

LINES_OF_CREDIT_AND_LONGTERM_D2

LINES OF CREDIT AND LONG-TERM DEBT - Outstanding Lines of Credit and Long-Term Debt (Detail) (USD $)	Jun. 30, 2014	Feb. 07, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Debt Instrument [Line Items]	'	'	'
Total debt outstanding	$833,044	'	$339,837
Less current portion	-42,401	'	-44,343
Total debt outstanding, less current installments	790,643	'	295,494
Senior Notes	'	'	'
Debt Instrument [Line Items]	'	'	'
Stated interest rate (percent)	10.75%	'	'
Capital Lease Obligations	'	'	'
Debt Instrument [Line Items]	'	'	'
Total debt outstanding	133,240	'	10,153
Other	'	'	'
Debt Instrument [Line Items]	'	'	'
Total debt outstanding	5,286	'	1,209
Debt premium (discount), net	'	'	'
Debt Instrument [Line Items]	'	'	'
Total debt outstanding	19,033	'	-8,525
Senior Notes due 2018 | Senior Notes	'	'	'
Debt Instrument [Line Items]	'	'	'
Total debt outstanding	250,485	'	251,500
Less current portion	'	'	-22,100
Total debt outstanding, less current installments	21,100	'	'
Stated interest rate (percent)	10.75%	10.75%	10.75%
Add On Notes - Senior Notes due 2018 | Senior Notes	'	'	'
Debt Instrument [Line Items]	'	'	'
Total debt outstanding	425,000	'	0
Stated interest rate (percent)	10.75%	'	'
WML Term Debt Due 2018 | Term Debt	'	'	'
Debt Instrument [Line Items]	'	'	'
Total debt outstanding	$0	'	$85,500
Stated interest rate (percent)	8.02%	'	'

LINES_OF_CREDIT_AND_LONGTERM_D3

LINES OF CREDIT AND LONG-TERM DEBT - Contractual Maturities of Long Term Debt (Details) (USD $)	Jun. 30, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Debt Disclosure [Abstract]	'	'
2014	$22,270	'
2015	41,290	'
2016	39,318	'
2017	25,776	'
2018	682,852	'
Thereafter	2,505	'
Total	814,011	'
Less: debt premium (discount), net	19,033	'
Total debt outstanding	$833,044	$339,837

LINES_OF_CREDIT_AND_LONGTERM_D4

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

0 Months Ended

6 Months Ended

6 Months Ended

0 Months Ended

3 Months Ended

0 Months Ended

3 Months Ended

6 Months Ended

12 Months Ended

Dec. 24, 2013

Jun. 30, 2014

Jun. 30, 2013

Dec. 31, 2013

Jun. 30, 2014

Jun. 25, 2014

Apr. 28, 2014

Dec. 24, 2013

Jun. 30, 2014

Apr. 28, 2014

Jun. 30, 2014

Apr. 28, 2014

Apr. 28, 2014

Apr. 28, 2014

Jun. 30, 2014

Feb. 07, 2014

Jun. 30, 2014

Jun. 30, 2014

Dec. 31, 2013

Senior Notes

Canadian Acquisition

Canadian Acquisition

Canadian Acquisition

Canadian Acquisition

Canadian Acquisition

Kemmerer Mine

Revolving Credit Facility

Revolving Credit Facility

Subfacility for Letters of Credit

Add On Notes - Senior Notes due 2018

Senior Notes due 2018

Senior Notes due 2018

Senior Notes due 2018

Senior Notes due 2018

Senior Notes

Canadian Acquisition

Senior Notes

Senior Notes

Senior Notes

Senior Notes

Senior Notes

Debt Instrument [Line Items]

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Aggregate principal amount

'

'

'

'

$675,500,000

'

'

'

'

$425,000,000

'

'

'

'

$425,000,000

$425,000,000

'

'

'

Stated interest rate (percent)

'

'

'

'

10.75%

'

'

'

'

10.75%

'

'

'

'

10.75%

10.75%

10.75%

10.75%

10.75%

Debt instrument price as percentage of face value

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

106.88%

'

'

'

Proceeds from issuance of debt

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

454,200,000

'

'

'

Debt premium

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

29,200,000

'

'

'

Cash paid

'

322,637,000

0

'

'

39,800,000

282,800,000

283,000,000

322,600,000

'

'

'

'

'

'

'

'

'

'

Transaction costs for acquisition and note offering

24,000,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Maximum borrowing capacity

'

'

'

'

'

'

'

'

'

'

'

60,000,000

60,000,000

60,000,000

'

'

'

'

'

Debt issuance costs capitalized

'

15,400,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Debt repurchased

'

'

'

'

1,000,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Principal amount of senior notes repurchased

'

'

'

'

1,000,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Loss on restructuring of debt

'

'

'

'

-100,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Excess cash flow

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

29,500,000

Excess cash flow offered for repurchase of debt

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

22,100,000

'

'

Current installments of long-term debt

'

42,401,000

'

44,343,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

22,100,000

Repayments of debt

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

1,000,000

'

Redemption price as percentage of face value of debt

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

100.00%

'

Long-term debt, less current installments

'

790,643,000

'

295,494,000

'

'

'

'

'

'

'

'

'

'

'

'

21,100,000

21,100,000

'

Capital lease obligations

'

'

'

'

'

'

'

'

'

'

$12,900,000

'

'

'

'

'

'

'

'

POSTRETIREMENT_MEDICAL_BENEFIT2

POSTRETIREMENT MEDICAL BENEFITS AND PENSION - Postretirement Medicial Benefit Obligations Balance Sheet Disclosures (Details) (Postretirement Medical Benefits, USD $)	3 Months Ended		6 Months Ended
In Thousands, unless otherwise specified	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Postretirement Medical Benefits	'	'	'	'
Components of net periodic benefit cost:	'	'	'	'
Service cost	$822	$1,109	$1,645	$2,218
Interest cost	3,203	3,035	6,407	6,069
Amortization of deferred items	4	1,001	9	2,003
Total net periodic benefit cost	$4,029	$5,145	$8,061	$10,290

POSTRETIREMENT_MEDICAL_BENEFIT3

POSTRETIREMENT MEDICAL BENEFITS AND PENSION - Postretirement Medical Benefit Obligations Income Statement Disclosures (Details) (Postretirement Medical Benefits, USD $)	3 Months Ended		6 Months Ended
In Thousands, unless otherwise specified	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Net periodic postretirement medical benefit costs relating to current and former mining operations:	'	'	'	'
Total net periodic benefit cost	$4,029	$5,145	$8,061	$10,290
Former Mining Operations	'	'	'	'
Net periodic postretirement medical benefit costs relating to current and former mining operations:	'	'	'	'
Total net periodic benefit cost	2,402	3,119	4,807	6,237
Current Operations	'	'	'	'
Net periodic postretirement medical benefit costs relating to current and former mining operations:	'	'	'	'
Total net periodic benefit cost	$1,627	$2,026	$3,254	$4,053

POSTRETIREMENT_MEDICAL_BENEFIT4

POSTRETIREMENT MEDICAL BENEFITS AND PENSION - Pension Benefit Disclosures (Details) (Pension, USD $)	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Pension	'	'	'	'
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]	'	'	'	'
Service cost	$500,000	$638,000	$1,000,000	$1,173,000
Interest cost	1,638,000	1,555,000	3,384,000	3,180,000
Expected return on plan assets	-2,154,000	-2,325,000	-4,307,000	-4,385,000
Amortization of deferred items	359,000	1,004,000	719,000	1,745,000
Total net periodic benefit cost	343,000	872,000	796,000	1,713,000
Cash contributions during the period	'	'	1,100,000	'
Expected contributions during the remainder of 2014	'	'	$3,200,000	'

HERITAGE_HEALTH_BENEFIT_EXPENS2

HERITAGE HEALTH BENEFIT EXPENSES - Components of Costs of Benefits to Former Mining Operation Employees (Detail) (USD $)	3 Months Ended		6 Months Ended
In Thousands, unless otherwise specified	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Heritage Health Benefit Expenses [Abstract]	'	'	'	'
Health care benefits	$2,376	$3,089	$4,650	$6,266
Combined benefit fund payments	512	576	1,025	1,152
Workers' compensation benefits	124	117	260	232
Black lung benefits (credit)	376	-673	997	-590
Total	$3,388	$3,109	$6,932	$7,060

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 $)	Jun. 30, 2014	Dec. 31, 2013	Jun. 30, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified
Asset Retirement Obligation [Line Items]	'	'	'	'
Asset Retirement Obligation	$389,384	$279,864	$263,151	$263,847
Contractual Third- Party Reclamation Receivable	101,896	'	'	'
Reclamation deposits	75,911	74,921	'	'
Coal - U.S. Segment	'	'	'	'
Asset Retirement Obligation [Line Items]	'	'	'	'
Asset Retirement Obligation	281,346	'	'	'
Contractual Third- Party Reclamation Receivable	95,157	'	'	'
Reclamation deposits	75,911	'	'	'
Coal - Canada Segment	'	'	'	'
Asset Retirement Obligation [Line Items]	'	'	'	'
Asset Retirement Obligation	107,111	'	'	'
Contractual Third- Party Reclamation Receivable	6,739	'	'	'
Reclamation deposits	0	'	'	'
Power Segment	'	'	'	'
Asset Retirement Obligation [Line Items]	'	'	'	'
Asset Retirement Obligation	927	'	'	'
Contractual Third- Party Reclamation Receivable	0	'	'	'
Reclamation deposits	$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 $)	6 Months Ended
In Thousands, unless otherwise specified	Jun. 30, 2014	Jun. 30, 2013	Dec. 31, 2013
Asset Retirement Obligation Disclosure [Abstract]	'	'	'
Asset retirement obligations, beginning of period (including current portion)	$279,864	$263,847	'
Accretion	14,003	10,951	'
Liabilities settled	-10,250	-11,647	'
ARO acquired	102,075	0	'
Changes due to foreign currency translation	3,692	0	'
Asset retirement obligations, end of period	389,384	263,151	'
Less current portion	-31,131	-24,105	-23,353
Asset retirement obligations, less current portion	$358,253	$239,046	$256,511

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 $)	Jun. 30, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Asset Retirement Obligation [Line Items]	'	'
Reclamation deposits	$75,911	$74,921
Carrying Value	'	'
Asset Retirement Obligation [Line Items]	'	'
Reclamation deposits	75,911	'
Carrying Value | Cash and cash equivalents | Level 1	'	'
Asset Retirement Obligation [Line Items]	'	'
Reclamation deposits	44,089	'
Carrying Value | Held-to-maturity securities | Level 2	'	'
Asset Retirement Obligation [Line Items]	'	'
Reclamation deposits	31,822	'
Fair Value	'	'
Asset Retirement Obligation [Line Items]	'	'
Reclamation deposits	76,690	'
Fair Value | Cash and cash equivalents | Level 1	'	'
Asset Retirement Obligation [Line Items]	'	'
Reclamation deposits	44,089	'
Fair Value | Held-to-maturity securities | Level 2	'	'
Asset Retirement Obligation [Line Items]	'	'
Reclamation deposits	$32,601	'

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, USD $)	Jun. 30, 2014
In Thousands, unless otherwise specified
Reclamation Deposits	'
Schedule of Held-to-maturity Securities [Line Items]	'
Amortized cost	$31,822
Gross unrealized holding gains	953
Gross unrealized holding losses	-174
Fair value	$32,601

ASSET_RETIREMENT_OBLIGATIONS_C6

ASSET RETIREMENT OBLIGATIONS, CONTRACTUAL THIRD-PARTY RECLAMATION RECEIVABLES, AND RECLAMATION DEPOSITS - Maturities of Held-to-Maturity Securities (Detail) (Reclamation Deposits, USD $)	Jun. 30, 2014
In Thousands, unless otherwise specified
Reclamation Deposits	'
Schedule of Held-to-maturity Securities [Line Items]	'
Within one year, Amortized cost	$1,025
Due in five years or less, Amortized cost	17,341
Due after five years to ten years, Amortized cost	7,289
Due in more than ten years, Amortized cost	6,167
Maturities of held-to-maturity securities, Amortized cost	31,822
Within one year, Fair Value	998
Due in five years or less, Fair Value	17,829
Due after five years to ten years, Fair Value	7,424
Due in more than ten years, Fair Value	6,350
Fair value	$32,601

DERIVATIVE_INSTRUMENTS_Details

DERIVATIVE INSTRUMENTS (Details) (USD $)	3 Months Ended	6 Months Ended
	Jun. 30, 2014	Jun. 30, 2014
Not Designated as Hedging Instrument | Foreign Exchange Forward	'	'
Derivative [Line Items]	'	'
Number of foreign currency exchange forward contracts	2	2
Notional amount	$348,300,000	$348,300,000
Not Designated as Hedging Instrument | Foreign Exchange Forward | Gain (loss) on foreign exchange	'	'
Derivative [Line Items]	'	'
Gain (loss) on derivative, net	581,000	-6,209,000
Not Designated as Hedging Instrument | Contracts to purchase power | Derivative loss	'	'
Derivative [Line Items]	'	'
Gain (loss) on derivative, net	-5,930,000	-5,930,000
Not Designated as Hedging Instrument | Contracts to purchase power | Other current liabilities	'	'
Derivative [Line Items]	'	'
Derivative Liability	140,000	140,000
Not Designated as Hedging Instrument | Contracts to purchase power | Other liabilities	'	'
Derivative [Line Items]	'	'
Derivative Liability	$5,790,000	$5,790,000
Minimum | Contracts to purchase power	'	'
Derivative [Line Items]	'	'
Contracted power price notional amount	'	41.05
Maximum | Contracts to purchase power	'	'
Derivative [Line Items]	'	'
Contracted power price notional amount	'	44.09

FAIR_VALUE_MEASUREMENTS_Detail

FAIR VALUE MEASUREMENTS (Details) (Significant unobservable inputs, Level 3, USD $)	Jun. 30, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Carrying Value	'	'
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]	'	'
Debt	$694,515	$328,473
Fair Value	'	'
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]	'	'
Debt	$726,146	$364,329

SHAREHOLDERS_EQUITY_AND_ACCUMU2

SHAREHOLDERS' EQUITY AND ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) - Changes in Accumulated Other Comprehensive Income by component (Details) (USD $)	6 Months Ended
In Thousands, unless otherwise specified	Jun. 30, 2014
Accumulated Other Comprehensive Income (Loss) [Line Items]	'
Balance at beginning of period	($63,595)
Other comprehensive income before reclassifications	9,253
Amounts reclassified from accumulated other comprehensive income (loss)	727
Balance at end of period	-53,615
Defined benefit plans adjustment | Pension	'
Accumulated Other Comprehensive Income (Loss) [Line Items]	'
Balance at beginning of period	-12,255
Amounts reclassified from accumulated other comprehensive income (loss)	717
Balance at end of period	-11,538
Defined benefit plans adjustment | Postretirement Medical Benefits	'
Accumulated Other Comprehensive Income (Loss) [Line Items]	'
Balance at beginning of period	-20,292
Amounts reclassified from accumulated other comprehensive income (loss)	10
Balance at end of period	-20,282
Foreign currency translation adjustment	'
Accumulated Other Comprehensive Income (Loss) [Line Items]	'
Balance at beginning of period	0
Other comprehensive income before reclassifications	9,477
Balance at end of period	9,477
Tax effect of other comprehensive income gains	'
Accumulated Other Comprehensive Income (Loss) [Line Items]	'
Balance at beginning of period	-31,048
Other comprehensive income before reclassifications	-224
Balance at end of period	($31,272)

SHAREHOLDERS_EQUITY_AND_ACCUMU3

SHAREHOLDERS' EQUITY AND ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) - Reclassifications out of Accumulated Other Comprehensive Income (Details) (Defined benefit plans adjustment, USD $)	3 Months Ended		6 Months Ended
In Thousands, unless otherwise specified	Jun. 30, 2014		Jun. 30, 2014
Pension	'		'
Reclassification out of Accumulated Other Comprehensive Income [Line Items]	'		'
Actuarial losses	$359	[1],[2]	$717	[1],[2]
Postretirement Medical Benefits	'		'
Reclassification out of Accumulated Other Comprehensive Income [Line Items]	'		'
Prior service costs	-159	[1],[3]	-318	[1],[3]
Actuarial losses	164	[1],[3]	328	[1],[3]
Amortization of defined benefit pension and postretirement medical benefits	$5	[1]	$10	[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 pension cost. (See Note 7 - Pension for additional details)
[3]	These accumulated other comprehensive loss components are included in the computation of net periodic postretirement medical cost. (See Note 7 - Postretirement Medical Benefits for additional details)

SHAREHOLDERS_EQUITY_AND_ACCUMU4

SHAREHOLDERS' EQUITY AND ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) - Additional Information (Detail) (USD $)	6 Months Ended		3 Months Ended	6 Months Ended	3 Months Ended	1 Months Ended	0 Months Ended	1 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2014	Jun. 30, 2014	Jul. 25, 2014	Jul. 16, 2014	Jul. 25, 2014
			Preferred Stock	Preferred Stock	Common Stock	Subsequent Event	Subsequent Event	Subsequent Event
						Preferred Stock	Common Stock	Common Stock
Class of Stock [Line Items]	'	'	'	'	'	'	'	'
Cumulative dividends paid on Series A Convertible Exchangeable Preferred Stock (in USD per share)	'	'	'	$2.13	'	'	'	'
Preferred dividends paid	$470,000	$680,000	'	'	'	'	'	'
Shares converted	'	'	25,454	'	'	3,825	'	'
Conversion of convertible notes and securities, shares	'	'	'	'	173,885	'	'	26,133
Equity Offering	'	'	'	'	'	'	'	'
Stock issued (shares)	'	'	'	'	'	'	1,684,507	'
Shares issued, (in USD per share)	'	'	'	'	'	'	$35.50	'
Gross proceeds from issuance of common stock	'	'	'	'	'	'	$59,800,000	'

SHAREBASED_COMPENSATION_Compen

SHARE-BASED COMPENSATION - Compensation Expense from Share-Based Arrangements (Detail) (USD $)	3 Months Ended		6 Months Ended
In Thousands, unless otherwise specified	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]	'	'	'	'
Recognition of fair value of restricted stock units, stock options, and SARs over vesting period; and issuance of common stock	$1,388	$597	$2,116	$2,260
Contributions of stock to the Company's 401(k) plan	329	788	329	1,511
Total share-based compensation expense	$1,717	$1,385	$2,445	$3,771

SHAREBASED_COMPENSATION_Summar

SHARE-BASED COMPENSATION - Summary of Restricted Stock Unit Activity (Detail) (Restricted Stock Units (RSUs), USD $)	6 Months Ended
In Thousands, except Share data, unless otherwise specified	Jun. 30, 2014
Restricted Stock Units (RSUs)	'
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]	'
Balance beginning of period (units)	588,727
Granted (units)	214,188
Vested (units)	-299,872
Balance end of period (units)	503,043
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Roll Forward]	'
Weighted Average Grant Date Fair Value, beginning of period (in USD per share)	$9.37
Weighted Average Grant Date Fair Value, Awards granted (in USD per share)	$0
Weighted Average Grant Date Fair Value, Awards vested (in USD per share)	$0
Weighted Average Grant Date Fair Value, end of period (in USD per share)	$8.64
Unamortized Compensation Expense	$5,605	[1]
[1]	Expected to be recognized over the next three years.

SHAREBASED_COMPENSATION_Summar1

SHARE-BASED COMPENSATION - Summary of Stock Options and SARs (Details) (USD $)	6 Months Ended
In Thousands, except Share data, unless otherwise specified	Jun. 30, 2014
Stock Appreciation Rights (SARs)	'
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'
Balance, beginning of period, shares	70,734
Exercised, shares	-36,291
Expired, shares	0
Balance, end of period, shares	34,443
Balance, beginning of period, weighted average exercise price	$22.60
Exercised, weighted average exercise price	$21.30
Expired, weighted average exercise price	$0
Balance, end of period, weighted average exercise price	$23.97
Outstanding - Weighted Average Remaining Contractual Life (In years)	'1 year 7 months 26 days
Exercisable - Weighted Average Remaining Contractual Life (In years)	'1 year 7 months 26 days
Aggregate Intrinsic Value	$424
Unamortized Compensation Expense	0
Granted, shares	0
Stock Options	'
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'
Balance, beginning of period, shares	145,806
Exercised, shares	-9,000
Expired, shares	0
Balance, end of period, shares	136,806
Balance, beginning of period, weighted average exercise price	$21.97
Exercised, weighted average exercise price	$21.40
Expired, weighted average exercise price	$0
Balance, end of period, weighted average exercise price	$22.01
Outstanding - Weighted Average Remaining Contractual Life (In years)	'3 years 8 months 12 days
Exercisable - Weighted Average Remaining Contractual Life (In years)	'3 years 8 months 12 days
Aggregate Intrinsic Value	1,953
Unamortized Compensation Expense	$0
Granted, shares	0

SHAREBASED_COMPENSATION_Narrat

SHARE-BASED COMPENSATION - Narrative (Details) (USD $)	6 Months Ended
	Jun. 30, 2014
Restricted Stock Units (RSUs)	'
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'
Period for recognition of unamortized compensation expense	'3 years
Amended And Restated Equity Incentive Stock Plan	'
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'
Non Employee Directors Annual Equity Awards Amount	90,000

EARNINGS_PER_SHARE_Antidilutiv

EARNINGS PER SHARE - Antidilutive securities excluded from the computation of earnings per share (Details)	3 Months Ended		6 Months Ended
In Thousands, unless otherwise specified	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Class of Stock [Line Items]	'	'	'	'
Shares excluded from diluted shares calculation	1,328	1,955	1,328	1,955
Convertible securities	'	'	'	'
Class of Stock [Line Items]	'	'	'	'
Shares excluded from diluted shares calculation	654	1,093	654	1,093
Restricted stock units, stock options and SARs	'	'	'	'
Class of Stock [Line Items]	'	'	'	'
Shares excluded from diluted shares calculation	674	862	674	862

BUSINESS_SEGMENT_INFORMATION_S

BUSINESS SEGMENT INFORMATION - Summarized Financial Information by Segment (Detail) (USD $)	3 Months Ended				6 Months Ended
In Thousands, unless otherwise specified	Jun. 30, 2014		Jun. 30, 2013		Jun. 30, 2014		Jun. 30, 2013		Dec. 31, 2013
					segments
Segment Reporting Information [Line Items]	'		'		'		'		'
Number of Reportable Segments	'		'		5		'		'
Revenues	$287,956		$162,499		$468,159		$323,947		'
Restructuring charges	7,543		0		7,941		0		'
Depreciation, depletion and amortization	24,479		15,397		40,538		29,823		'
Income (loss) from operations	-29,640		11,975		-21,588		17,710		'
Total assets	1,583,721		933,603		1,583,721		933,603		946,685
Capital expenditures	14,311		8,166		17,361		13,467		'
Coal - U.S. Segment	'		'		'		'		'
Segment Reporting Information [Line Items]	'		'		'		'		'
Revenues	150,107		139,337		308,298		281,449		'
Restructuring charges	491		'		491		'		'
Depreciation, depletion and amortization	13,283		12,804		26,780		24,658		'
Income (loss) from operations	-423		12,572		12,275		25,566		'
Total assets	670,375		699,556		670,375		699,556		'
Capital expenditures	6,533		7,209		9,586		12,219		'
Coal - Canada Segment	'		'		'		'		'
Segment Reporting Information [Line Items]	'		'		'		'		'
Revenues	116,046	[1]	0	[1]	116,046	[1]	0	[1]	'
Restructuring charges	6,646	[1]	'		6,646	[1]	'		'
Depreciation, depletion and amortization	8,671	[1]	0	[1]	8,671	[1]	0	[1]	'
Income (loss) from operations	-12,709	[1]	0	[1]	-12,709	[1]	0	[1]	'
Total assets	687,185	[1]	0	[1]	687,185	[1]	0	[1]	'
Capital expenditures	7,495	[1]	0	[1]	7,495	[1]	0	[1]	'
Power Segment	'		'		'		'		'
Segment Reporting Information [Line Items]	'		'		'		'		'
Revenues	21,803		23,162		43,815		42,498		'
Restructuring charges	101		'		499		'		'
Depreciation, depletion and amortization	2,486		2,551		5,009		5,081		'
Income (loss) from operations	-9,473		4,837		-7,731		3,836		'
Total assets	165,763		183,855		165,763		183,855		'
Capital expenditures	220		564		255		698		'
Heritage Segment	'		'		'		'		'
Segment Reporting Information [Line Items]	'		'		'		'		'
Revenues	0		0		0		0		'
Restructuring charges	0		'		0		'		'
Depreciation, depletion and amortization	0		0		0		0		'
Income (loss) from operations	-3,559		-3,530		-7,389		-7,705		'
Total assets	15,664		16,305		15,664		16,305		'
Capital expenditures	0		0		0		0		'
Corporate Segment	'		'		'		'		'
Segment Reporting Information [Line Items]	'		'		'		'		'
Revenues	0		0		0		0		'
Restructuring charges	305		'		305		'		'
Depreciation, depletion and amortization	39		42		78		84		'
Income (loss) from operations	-3,476		-1,904		-6,034		-3,987		'
Total assets	44,734		33,887		44,734		33,887		'
Capital expenditures	$63		$393		$25		$550		'
[1]	The Canadian operations were acquired on April 28, 2014, therefore, information for the three and six months ended June 30, 2014 includes approximately two months of operations and there is no activity for 2013.

BUSINESS_SEGMENT_INFORMATION_R

BUSINESS SEGMENT INFORMATION - Reconciliation of Segment Operating Income to Income (Loss) (Detail) (USD $)	3 Months Ended		6 Months Ended
In Thousands, unless otherwise specified	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Segment Reporting [Abstract]	'	'	'	'
Income (loss) from operations	($29,640)	$11,975	($21,588)	$17,710
Loss on extinguishment of debt	-12,635	-64	-12,635	-64
Interest expense	-21,786	-10,076	-42,584	-20,236
Interest income	1,582	280	1,884	577
Gain (loss) on foreign exchange	2,649	0	-4,141	0
Other income	483	130	576	198
Income (loss) before income taxes	($59,347)	$2,245	($78,488)	($1,815)

SUPPLEMENTAL_CONSOLIDATING_FIN2

SUPPLEMENTAL CONSOLIDATING FINANCIAL INFORMATION - Supplemental Consolidating Balance Sheet Information (Detail) (USD $)	Jun. 30, 2014	Dec. 31, 2013	Jun. 30, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified
Current assets:	'	'	'	'
Cash and cash equivalents	$40,610	$61,110	$36,274	$31,610
Receivables:	'	'	'	'
Trade	129,652	66,196	'	'
Loan and lease receivable	11,682	0	'	'
Contractual third-party reclamation receivables	7,940	8,487	'	'
Intercompany receivable/payable	0	0	'	'
Other	3,182	5,086	'	'
Total receivables	152,456	79,769	'	'
Inventories	153,154	39,972	'	'
Deferred income taxes	6,053	5,355	'	'
Restricted investments and bond collateral	0	5,998	'	'
Other current assets	12,362	12,835	'	'
Total current assets	364,635	205,039	'	'
Property, plant and equipment:	'	'	'	'
Land and mineral rights	439,001	278,188	'	'
Plant and equipment	832,337	657,696	'	'
Gross property, plant and equipment	1,271,338	935,884	'	'
Less accumulated depreciation, depletion and amortization	485,820	445,848	'	'
Net property, plant and equipment	785,518	490,036	'	'
Loan and lease receivable	85,344	0	'	'
Advanced coal royalties	7,134	7,311	'	'
Reclamation deposits	75,911	74,921	'	'
Restricted investments and bond collateral	104,511	69,235	'	'
Contractual third-party reclamation receivables	93,956	88,303	'	'
Investment in joint venture	33,273	0	'	'
Intangible assets	677	1,520	'	'
Investment in subsidiaries	0	0	'	'
Other assets	32,762	10,320	'	'
Total Assets	1,583,721	946,685	933,603	'
Current liabilities	'	'	'	'
Current installments of long-term debt	42,401	44,343	'	'
Accounts payable and accrued expenses:	'	'	'	'
Trade	128,338	57,507	'	'
Interest payable	30,750	11,321	'	'
Production taxes	42,673	41,905	'	'
Workers' compensation	707	717	'	'
Postretirement medical benefits	13,955	13,955	'	'
SERP	390	390	'	'
Deferred revenue	11,561	14,068	'	'
Asset retirement obligations	31,131	23,353	24,105	'
Other current liabilities	11,973	5,469	'	'
Total current liabilities	313,879	213,028	'	'
Long-term debt, less current installments	790,643	295,494	'	'
Workers' compensation, less current portion	6,629	6,744	'	'
Excess of black lung benefit obligation over trust assets	9,841	8,675	'	'
Postretirement medical benefits, less current portion	271,773	270,374	'	'
Pension and SERP obligations, less current portion	22,222	24,176	'	'
Deferred revenue, less current portion	40,676	46,567	'	'
Asset retirement obligations, less current portion	358,253	256,511	239,046	'
Intangible liabilities	5,072	5,606	'	'
Deferred income taxes	15,514	5,355	'	'
Other liabilities	9,864	2,034	'	'
Intercompany receivable/payable	0	0	'	'
Total liabilities	1,844,366	1,134,564	'	'
Shareholders' deficit:	'	'	'	'
Preferred stock	96	160	'	'
Common stock	38,173	36,479	'	'
Other paid-in capital	133,140	134,861	'	'
Accumulated other comprehensive loss	-53,615	-63,595	'	'
Accumulated earnings (deficit)	-378,439	-295,784	'	'
Total equity (deficit)	-260,645	-187,879	'	'
Total Liabilities and Shareholders' Deficit	1,583,721	946,685	'	'
Parent/ Issuer	'	'	'	'
Current assets:	'	'	'	'
Cash and cash equivalents	13,514	25,326	15,665	14,836
Receivables:	'	'	'	'
Trade	0	0	'	'
Loan and lease receivable	0	'	'	'
Contractual third-party reclamation receivables	0	0	'	'
Intercompany receivable/payable	132,824	-16,273	'	'
Other	673	1,616	'	'
Total receivables	133,497	-14,657	'	'
Inventories	0	0	'	'
Deferred income taxes	5,370	5,355	'	'
Restricted investments and bond collateral	'	0	'	'
Other current assets	972	789	'	'
Total current assets	153,353	16,813	'	'
Property, plant and equipment:	'	'	'	'
Land and mineral rights	0	0	'	'
Plant and equipment	4,022	3,973	'	'
Gross property, plant and equipment	4,022	3,973	'	'
Less accumulated depreciation, depletion and amortization	2,863	2,707	'	'
Net property, plant and equipment	1,159	1,266	'	'
Loan and lease receivable	0	'	'	'
Advanced coal royalties	0	0	'	'
Reclamation deposits	0	0	'	'
Restricted investments and bond collateral	63,322	15,134	'	'
Contractual third-party reclamation receivables	0	0	'	'
Investment in joint venture	0	'	'	'
Intangible assets	0	0	'	'
Investment in subsidiaries	480,871	280,843	'	'
Other assets	21,825	8,636	'	'
Total Assets	720,530	322,692	'	'
Current liabilities	'	'	'	'
Current installments of long-term debt	0	20,392	'	'
Accounts payable and accrued expenses:	'	'	'	'
Trade	5,240	6,840	'	'
Interest payable	30,315	11,302	'	'
Production taxes	0	0	'	'
Workers' compensation	707	717	'	'
Postretirement medical benefits	12,042	12,042	'	'
SERP	390	390	'	'
Deferred revenue	0	0	'	'
Asset retirement obligations	0	0	'	'
Other current liabilities	593	0	'	'
Total current liabilities	49,287	51,683	'	'
Long-term debt, less current installments	698,015	224,582	'	'
Workers' compensation, less current portion	6,629	6,744	'	'
Excess of black lung benefit obligation over trust assets	9,841	8,675	'	'
Postretirement medical benefits, less current portion	184,902	185,858	'	'
Pension and SERP obligations, less current portion	12,776	13,069	'	'
Deferred revenue, less current portion	0	0	'	'
Asset retirement obligations, less current portion	0	0	'	'
Intangible liabilities	0	0	'	'
Deferred income taxes	5,370	5,355	'	'
Other liabilities	707	584	'	'
Intercompany receivable/payable	13,648	14,021	'	'
Total liabilities	981,175	510,571	'	'
Shareholders' deficit:	'	'	'	'
Preferred stock	96	160	'	'
Common stock	38,173	36,479	'	'
Other paid-in capital	133,140	134,861	'	'
Accumulated other comprehensive loss	-53,615	-63,595	'	'
Accumulated earnings (deficit)	-378,439	-295,784	'	'
Total equity (deficit)	-260,645	-187,879	'	'
Total Liabilities and Shareholders' Deficit	720,530	322,692	'	'
Co-Issuer	'	'	'	'
Current assets:	'	'	'	'
Cash and cash equivalents	415	3,341	476	4,545
Receivables:	'	'	'	'
Trade	12,940	12,934	'	'
Loan and lease receivable	0	'	'	'
Contractual third-party reclamation receivables	0	0	'	'
Intercompany receivable/payable	32,639	0	'	'
Other	210	210	'	'
Total receivables	45,789	13,144	'	'
Inventories	5,319	6,161	'	'
Deferred income taxes	0	0	'	'
Restricted investments and bond collateral	'	5,998	'	'
Other current assets	335	143	'	'
Total current assets	51,858	28,787	'	'
Property, plant and equipment:	'	'	'	'
Land and mineral rights	1,395	1,395	'	'
Plant and equipment	221,350	220,872	'	'
Gross property, plant and equipment	222,745	222,267	'	'
Less accumulated depreciation, depletion and amortization	76,662	71,653	'	'
Net property, plant and equipment	146,083	150,614	'	'
Loan and lease receivable	0	'	'	'
Advanced coal royalties	0	0	'	'
Reclamation deposits	0	0	'	'
Restricted investments and bond collateral	0	0	'	'
Contractual third-party reclamation receivables	0	0	'	'
Investment in joint venture	0	'	'	'
Intangible assets	460	1,283	'	'
Investment in subsidiaries	0	0	'	'
Other assets	0	0	'	'
Total Assets	198,401	180,684	'	'
Current liabilities	'	'	'	'
Current installments of long-term debt	0	0	'	'
Accounts payable and accrued expenses:	'	'	'	'
Trade	7,996	10,119	'	'
Interest payable	0	0	'	'
Production taxes	1,081	3	'	'
Workers' compensation	0	0	'	'
Postretirement medical benefits	0	0	'	'
SERP	0	0	'	'
Deferred revenue	9,581	9,024	'	'
Asset retirement obligations	0	0	'	'
Other current liabilities	5,279	5,053	'	'
Total current liabilities	23,937	24,199	'	'
Long-term debt, less current installments	0	0	'	'
Workers' compensation, less current portion	0	0	'	'
Excess of black lung benefit obligation over trust assets	0	0	'	'
Postretirement medical benefits, less current portion	0	0	'	'
Pension and SERP obligations, less current portion	97	99	'	'
Deferred revenue, less current portion	35,949	41,297	'	'
Asset retirement obligations, less current portion	927	892	'	'
Intangible liabilities	5,072	5,606	'	'
Deferred income taxes	0	0	'	'
Other liabilities	5,790	0	'	'
Intercompany receivable/payable	0	0	'	'
Total liabilities	71,772	72,093	'	'
Shareholders' deficit:	'	'	'	'
Preferred stock	0	0	'	'
Common stock	5	5	'	'
Other paid-in capital	52,848	52,835	'	'
Accumulated other comprehensive loss	-160	-164	'	'
Accumulated earnings (deficit)	73,936	55,915	'	'
Total equity (deficit)	126,629	108,591	'	'
Total Liabilities and Shareholders' Deficit	198,401	180,684	'	'
Guarantor Subsidiaries	'	'	'	'
Current assets:	'	'	'	'
Cash and cash equivalents	24,440	27,451	16,416	10,237
Receivables:	'	'	'	'
Trade	116,712	46,985	'	'
Loan and lease receivable	11,682	'	'	'
Contractual third-party reclamation receivables	7,940	8,487	'	'
Intercompany receivable/payable	-146,187	2,761	'	'
Other	2,294	3,256	'	'
Total receivables	-7,559	61,489	'	'
Inventories	147,834	33,811	'	'
Deferred income taxes	683	870	'	'
Restricted investments and bond collateral	'	0	'	'
Other current assets	11,055	11,069	'	'
Total current assets	176,453	134,690	'	'
Property, plant and equipment:	'	'	'	'
Land and mineral rights	437,606	276,793	'	'
Plant and equipment	606,965	432,851	'	'
Gross property, plant and equipment	1,044,571	709,644	'	'
Less accumulated depreciation, depletion and amortization	406,295	371,488	'	'
Net property, plant and equipment	638,276	338,156	'	'
Loan and lease receivable	85,344	'	'	'
Advanced coal royalties	7,134	7,311	'	'
Reclamation deposits	75,911	74,921	'	'
Restricted investments and bond collateral	41,189	54,101	'	'
Contractual third-party reclamation receivables	93,956	88,303	'	'
Investment in joint venture	33,273	'	'	'
Intangible assets	217	237	'	'
Investment in subsidiaries	0	0	'	'
Other assets	10,937	1,683	'	'
Total Assets	1,162,690	699,402	'	'
Current liabilities	'	'	'	'
Current installments of long-term debt	42,401	23,951	'	'
Accounts payable and accrued expenses:	'	'	'	'
Trade	114,423	38,061	'	'
Interest payable	474	40	'	'
Production taxes	38,936	36,522	'	'
Workers' compensation	0	0	'	'
Postretirement medical benefits	773	774	'	'
SERP	0	0	'	'
Deferred revenue	1,980	5,044	'	'
Asset retirement obligations	31,131	23,353	'	'
Other current liabilities	6,102	417	'	'
Total current liabilities	236,220	128,162	'	'
Long-term debt, less current installments	96,128	72,912	'	'
Workers' compensation, less current portion	0	0	'	'
Excess of black lung benefit obligation over trust assets	0	0	'	'
Postretirement medical benefits, less current portion	68,766	66,439	'	'
Pension and SERP obligations, less current portion	9,110	10,765	'	'
Deferred revenue, less current portion	4,728	5,270	'	'
Asset retirement obligations, less current portion	357,326	255,619	'	'
Intangible liabilities	0	0	'	'
Deferred income taxes	10,144	0	'	'
Other liabilities	3,167	6,687	'	'
Intercompany receivable/payable	-13,849	-7,851	'	'
Total liabilities	771,740	538,003	'	'
Shareholders' deficit:	'	'	'	'
Preferred stock	0	0	'	'
Common stock	110	110	'	'
Other paid-in capital	441,269	157,984	'	'
Accumulated other comprehensive loss	16,075	6,425	'	'
Accumulated earnings (deficit)	-66,504	-3,120	'	'
Total equity (deficit)	390,950	161,399	'	'
Total Liabilities and Shareholders' Deficit	1,162,690	699,402	'	'
Non-Guarantor Subsidiaries	'	'	'	'
Current assets:	'	'	'	'
Cash and cash equivalents	2,241	4,992	3,717	1,992
Receivables:	'	'	'	'
Trade	0	6,277	'	'
Loan and lease receivable	0	'	'	'
Contractual third-party reclamation receivables	0	0	'	'
Intercompany receivable/payable	-19,275	-19,353	'	'
Other	45	28	'	'
Total receivables	-19,230	-13,048	'	'
Inventories	1	0	'	'
Deferred income taxes	0	0	'	'
Restricted investments and bond collateral	'	0	'	'
Other current assets	0	834	'	'
Total current assets	-16,988	-7,222	'	'
Property, plant and equipment:	'	'	'	'
Land and mineral rights	0	0	'	'
Plant and equipment	0	0	'	'
Gross property, plant and equipment	0	0	'	'
Less accumulated depreciation, depletion and amortization	0	0	'	'
Net property, plant and equipment	0	0	'	'
Loan and lease receivable	0	'	'	'
Advanced coal royalties	0	0	'	'
Reclamation deposits	0	0	'	'
Restricted investments and bond collateral	0	0	'	'
Contractual third-party reclamation receivables	0	0	'	'
Investment in joint venture	0	'	'	'
Intangible assets	0	0	'	'
Investment in subsidiaries	3,770	3,770	'	'
Other assets	3,500	2,000	'	'
Total Assets	-9,718	-1,452	'	'
Current liabilities	'	'	'	'
Current installments of long-term debt	0	0	'	'
Accounts payable and accrued expenses:	'	'	'	'
Trade	684	2,487	'	'
Interest payable	0	0	'	'
Production taxes	2,657	5,380	'	'
Workers' compensation	0	0	'	'
Postretirement medical benefits	1,139	1,139	'	'
SERP	0	0	'	'
Deferred revenue	0	0	'	'
Asset retirement obligations	0	0	'	'
Other current liabilities	0	0	'	'
Total current liabilities	4,480	9,006	'	'
Long-term debt, less current installments	0	0	'	'
Workers' compensation, less current portion	0	0	'	'
Excess of black lung benefit obligation over trust assets	0	0	'	'
Postretirement medical benefits, less current portion	18,105	18,077	'	'
Pension and SERP obligations, less current portion	239	243	'	'
Deferred revenue, less current portion	0	0	'	'
Asset retirement obligations, less current portion	0	0	'	'
Intangible liabilities	0	0	'	'
Deferred income taxes	0	0	'	'
Other liabilities	200	983	'	'
Intercompany receivable/payable	14,654	14,654	'	'
Total liabilities	37,678	42,963	'	'
Shareholders' deficit:	'	'	'	'
Preferred stock	0	0	'	'
Common stock	132	132	'	'
Other paid-in capital	-124	-124	'	'
Accumulated other comprehensive loss	-3,067	-3,086	'	'
Accumulated earnings (deficit)	-44,337	-41,337	'	'
Total equity (deficit)	-47,396	-44,415	'	'
Total Liabilities and Shareholders' Deficit	-9,718	-1,452	'	'
Consolidating Adjustments	'	'	'	'
Current assets:	'	'	'	'
Cash and cash equivalents	0	0	0	0
Receivables:	'	'	'	'
Trade	0	0	'	'
Loan and lease receivable	0	'	'	'
Contractual third-party reclamation receivables	0	0	'	'
Intercompany receivable/payable	-1	32,865	'	'
Other	-40	-24	'	'
Total receivables	-41	32,841	'	'
Inventories	0	0	'	'
Deferred income taxes	0	-870	'	'
Restricted investments and bond collateral	'	0	'	'
Other current assets	0	0	'	'
Total current assets	-41	31,971	'	'
Property, plant and equipment:	'	'	'	'
Land and mineral rights	0	0	'	'
Plant and equipment	0	0	'	'
Gross property, plant and equipment	0	0	'	'
Less accumulated depreciation, depletion and amortization	0	0	'	'
Net property, plant and equipment	0	0	'	'
Loan and lease receivable	0	'	'	'
Advanced coal royalties	0	0	'	'
Reclamation deposits	0	0	'	'
Restricted investments and bond collateral	0	0	'	'
Contractual third-party reclamation receivables	0	0	'	'
Investment in joint venture	0	'	'	'
Intangible assets	0	0	'	'
Investment in subsidiaries	-484,641	-284,613	'	'
Other assets	-3,500	-1,999	'	'
Total Assets	-488,182	-254,641	'	'
Current liabilities	'	'	'	'
Current installments of long-term debt	0	0	'	'
Accounts payable and accrued expenses:	'	'	'	'
Trade	-5	0	'	'
Interest payable	-39	-21	'	'
Production taxes	-1	0	'	'
Workers' compensation	0	0	'	'
Postretirement medical benefits	1	0	'	'
SERP	0	0	'	'
Deferred revenue	0	0	'	'
Asset retirement obligations	0	0	'	'
Other current liabilities	-1	-1	'	'
Total current liabilities	-45	-22	'	'
Long-term debt, less current installments	-3,500	-2,000	'	'
Workers' compensation, less current portion	0	0	'	'
Excess of black lung benefit obligation over trust assets	0	0	'	'
Postretirement medical benefits, less current portion	0	0	'	'
Pension and SERP obligations, less current portion	0	0	'	'
Deferred revenue, less current portion	-1	0	'	'
Asset retirement obligations, less current portion	0	0	'	'
Intangible liabilities	0	0	'	'
Deferred income taxes	0	0	'	'
Other liabilities	0	-6,220	'	'
Intercompany receivable/payable	-14,453	-20,824	'	'
Total liabilities	-17,999	-29,066	'	'
Shareholders' deficit:	'	'	'	'
Preferred stock	0	0	'	'
Common stock	-247	-247	'	'
Other paid-in capital	-493,993	-210,695	'	'
Accumulated other comprehensive loss	-12,848	-3,175	'	'
Accumulated earnings (deficit)	36,905	-11,458	'	'
Total equity (deficit)	-470,183	-225,575	'	'
Total Liabilities and Shareholders' Deficit	($488,182)	($254,641)	'	'

SUPPLEMENTAL_CONSOLIDATING_FIN3

SUPPLEMENTAL CONSOLIDATING FINANCIAL INFORMATION - Supplemental Consolidating Statement of Operations Information (Detail) (USD $)	3 Months Ended		6 Months Ended
In Thousands, unless otherwise specified	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Condensed Financial Statements, Captions [Line Items]	'	'	'	'
Revenues	$287,956	$162,499	$468,159	$323,947
Costs, expenses and other:	'	'	'	'
Cost of sales	248,389	130,528	387,019	260,949
Depreciation, depletion and amortization	24,479	15,397	40,538	29,823
Selling and administrative	28,709	11,969	42,040	23,855
Heritage health benefit expenses	3,388	3,109	6,932	7,060
Loss (gain) on sales of assets	-43	-74	-5	-308
Restructuring charges	7,543	0	7,941	0
Derivative loss	5,930	0	5,930	0
Income from equity affiliates	-799	0	-799	0
Other operating loss (income)	0	-10,405	151	-15,142
Total costs, expenses and other	317,596	150,524	489,747	306,237
Operating income (loss)	-29,640	11,975	-21,588	17,710
Other income (expense):	'	'	'	'
Interest expense	-21,786	-10,076	-42,584	-20,236
Loss on extinguishment of debt	-12,635	-64	-12,635	-64
Interest income	1,582	280	1,884	577
Gain (loss) on foreign exchange	2,649	0	-4,141	0
Other income	483	130	576	198
Total other income (expense)	-29,707	-9,730	-56,900	-19,525
Income (loss) before income taxes and income of consolidated subsidiaries	-59,347	2,245	-78,488	-1,815
Equity in income of subsidiaries	0	0	0	0
Income (loss) before income taxes	-59,347	2,245	-78,488	-1,815
Income tax expense (benefit)	3,807	28	3,697	55
Net income (loss)	-63,154	2,217	-82,185	-1,870
Less net income attributable to noncontrolling interest	0	2,499	0	797
Net income (loss) attributable to the Parent company	-63,154	-282	-82,185	-2,667
Parent/ Issuer	'	'	'	'
Condensed Financial Statements, Captions [Line Items]	'	'	'	'
Revenues	0	0	0	0
Costs, expenses and other:	'	'	'	'
Cost of sales	-247	-372	-471	-770
Depreciation, depletion and amortization	79	94	156	187
Selling and administrative	12,003	4,259	16,968	8,207
Heritage health benefit expenses	3,178	2,844	6,504	6,533
Loss (gain) on sales of assets	0	0	0	0
Restructuring charges	796	'	796	'
Derivative loss	0	'	0	'
Income from equity affiliates	0	'	0	'
Other operating loss (income)	'	0	0	0
Total costs, expenses and other	15,809	6,825	23,953	14,157
Operating income (loss)	-15,809	-6,825	-23,953	-14,157
Other income (expense):	'	'	'	'
Interest expense	-18,609	-7,591	-37,282	-15,175
Loss on extinguishment of debt	-63	-64	-62	-64
Interest income	145	46	269	76
Gain (loss) on foreign exchange	1,557	'	-5,233	'
Other income	0	2	0	0
Total other income (expense)	-16,970	-7,607	-42,308	-15,163
Income (loss) before income taxes and income of consolidated subsidiaries	-32,779	-14,432	-66,261	-29,320
Equity in income of subsidiaries	-30,462	16,648	-16,148	27,450
Income (loss) before income taxes	-63,241	2,216	-82,409	-1,870
Income tax expense (benefit)	-87	-1	-224	0
Net income (loss)	-63,154	2,217	-82,185	-1,870
Less net income attributable to noncontrolling interest	0	2,499	'	797
Net income (loss) attributable to the Parent company	-63,154	-282	-82,185	-2,667
Co-Issuer	'	'	'	'
Condensed Financial Statements, Captions [Line Items]	'	'	'	'
Revenues	21,803	23,162	43,815	42,498
Costs, expenses and other:	'	'	'	'
Cost of sales	21,592	14,901	38,046	31,856
Depreciation, depletion and amortization	2,485	2,551	5,009	5,082
Selling and administrative	1,169	872	2,062	1,726
Heritage health benefit expenses	0	0	0	0
Loss (gain) on sales of assets	0	0	0	0
Restructuring charges	101	'	499	'
Derivative loss	5,930	'	5,930	'
Income from equity affiliates	0	'	0	'
Other operating loss (income)	'	0	0	0
Total costs, expenses and other	31,277	18,324	51,546	38,664
Operating income (loss)	-9,474	4,838	-7,731	3,834
Other income (expense):	'	'	'	'
Interest expense	-74	-10	-118	-20
Loss on extinguishment of debt	0	0	0	0
Interest income	4	5	7	15
Gain (loss) on foreign exchange	0	'	0	'
Other income	0	0	0	0
Total other income (expense)	-70	-5	-111	-5
Income (loss) before income taxes and income of consolidated subsidiaries	-9,544	4,833	-7,842	3,829
Equity in income of subsidiaries	0	0	0	0
Income (loss) before income taxes	-9,544	4,833	-7,842	3,829
Income tax expense (benefit)	0	0	0	0
Net income (loss)	-9,544	4,833	-7,842	3,829
Less net income attributable to noncontrolling interest	0	0	'	0
Net income (loss) attributable to the Parent company	-9,544	4,833	-7,842	3,829
Guarantor Subsidiaries	'	'	'	'
Condensed Financial Statements, Captions [Line Items]	'	'	'	'
Revenues	266,153	134,449	424,351	274,187
Costs, expenses and other:	'	'	'	'
Cost of sales	227,044	113,640	349,389	223,417
Depreciation, depletion and amortization	21,915	12,753	35,373	24,554
Selling and administrative	15,921	7,232	23,783	14,680
Heritage health benefit expenses	0	0	0	0
Loss (gain) on sales of assets	-43	-74	-5	-308
Restructuring charges	6,646	'	6,646	'
Derivative loss	0	'	0	'
Income from equity affiliates	-799	'	-799	'
Other operating loss (income)	'	-10,405	150	-15,142
Total costs, expenses and other	270,684	123,146	414,537	247,201
Operating income (loss)	-4,531	11,303	9,814	26,986
Other income (expense):	'	'	'	'
Interest expense	-3,111	-2,479	-5,199	-5,048
Loss on extinguishment of debt	-12,571	0	-12,572	0
Interest income	1,433	232	1,608	493
Gain (loss) on foreign exchange	1,092	'	1,092	'
Other income	483	130	576	200
Total other income (expense)	-12,674	-2,117	-14,495	-4,355
Income (loss) before income taxes and income of consolidated subsidiaries	-17,205	9,186	-4,681	22,631
Equity in income of subsidiaries	0	0	0	0
Income (loss) before income taxes	-17,205	9,186	-4,681	22,631
Income tax expense (benefit)	-74	1,139	5,041	4,458
Net income (loss)	-17,131	8,047	-9,722	18,173
Less net income attributable to noncontrolling interest	0	0	'	0
Net income (loss) attributable to the Parent company	-17,131	8,047	-9,722	18,173
Non-Guarantor Subsidiaries	'	'	'	'
Condensed Financial Statements, Captions [Line Items]	'	'	'	'
Revenues	0	9,538	-7	20,889
Costs, expenses and other:	'	'	'	'
Cost of sales	0	7,009	55	20,073
Depreciation, depletion and amortization	0	0	0	0
Selling and administrative	-384	-394	-773	-758
Heritage health benefit expenses	210	265	428	527
Loss (gain) on sales of assets	0	0	0	0
Restructuring charges	0	'	0	'
Derivative loss	0	'	0	'
Income from equity affiliates	0	'	0	'
Other operating loss (income)	'	0	1	0
Total costs, expenses and other	-174	6,880	-289	19,842
Operating income (loss)	174	2,658	282	1,047
Other income (expense):	'	'	'	'
Interest expense	-1	-5	0	-10
Loss on extinguishment of debt	-1	0	-1	0
Interest income	0	6	15	10
Gain (loss) on foreign exchange	0	'	0	'
Other income	0	-2	0	-2
Total other income (expense)	-2	-1	14	-2
Income (loss) before income taxes and income of consolidated subsidiaries	172	2,657	296	1,045
Equity in income of subsidiaries	0	0	0	0
Income (loss) before income taxes	172	2,657	296	1,045
Income tax expense (benefit)	1	0	0	0
Net income (loss)	171	2,657	296	1,045
Less net income attributable to noncontrolling interest	0	0	'	0
Net income (loss) attributable to the Parent company	171	2,657	296	1,045
Consolidating Adjustments	'	'	'	'
Condensed Financial Statements, Captions [Line Items]	'	'	'	'
Revenues	0	-4,650	0	-13,627
Costs, expenses and other:	'	'	'	'
Cost of sales	0	-4,650	0	-13,627
Depreciation, depletion and amortization	0	-1	0	0
Selling and administrative	0	0	0	0
Heritage health benefit expenses	0	0	0	0
Loss (gain) on sales of assets	0	0	0	0
Restructuring charges	0	'	0	'
Derivative loss	0	'	0	'
Income from equity affiliates	0	'	0	'
Other operating loss (income)	'	0	0	0
Total costs, expenses and other	0	-4,651	0	-13,627
Operating income (loss)	0	1	0	0
Other income (expense):	'	'	'	'
Interest expense	9	9	15	17
Loss on extinguishment of debt	0	0	0	0
Interest income	0	-9	-15	-17
Gain (loss) on foreign exchange	0	'	0	'
Other income	0	0	0	0
Total other income (expense)	9	0	0	0
Income (loss) before income taxes and income of consolidated subsidiaries	9	1	0	0
Equity in income of subsidiaries	30,462	-16,648	16,148	-27,450
Income (loss) before income taxes	30,471	-16,647	16,148	-27,450
Income tax expense (benefit)	3,967	-1,110	-1,120	-4,403
Net income (loss)	26,504	-15,537	17,268	-23,047
Less net income attributable to noncontrolling interest	0	0	'	0
Net income (loss) attributable to the Parent company	$26,504	($15,537)	$17,268	($23,047)

SUPPLEMENTAL_CONSOLIDATING_FIN4

SUPPLEMENTAL CONSOLIDATING FINANCIAL INFORMATION - Supplemental Consolidating Statements of Comprehensive Income (Loss) (Detail) (USD $)	3 Months Ended		6 Months Ended
In Thousands, unless otherwise specified	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Condensed Financial Statements, Captions [Line Items]	'	'	'	'
Net income (loss)	($63,154)	$2,217	($82,185)	($1,870)
Other comprehensive income (loss)	'	'	'	'
Amortization of accumulated actuarial gains or losses, pension	359	1,004	717	1,745
Amortization of accumulated actuarial gains or losses, transition obligations, and prior service costs, postretirement medical benefit	5	1,001	10	2,002
Tax effect of other comprehensive income gains	64	0	-224	0
Change in foreign currency translation adjustment	9,477	0	9,477	0
Unrealized and realized gains and losses on available-for-sale securities	0	-39	0	-39
Other comprehensive income	9,905	1,966	9,980	3,708
Comprehensive income (loss) attributable to Westmoreland Coal Company	-53,249	4,183	-72,205	1,838
Parent/ Issuer	'	'	'	'
Condensed Financial Statements, Captions [Line Items]	'	'	'	'
Net income (loss)	-63,154	2,217	-82,185	-1,870
Other comprehensive income (loss)	'	'	'	'
Amortization of accumulated actuarial gains or losses, pension	359	1,004	717	1,745
Amortization of accumulated actuarial gains or losses, transition obligations, and prior service costs, postretirement medical benefit	5	1,001	10	2,002
Tax effect of other comprehensive income gains	64	'	-224	'
Change in foreign currency translation adjustment	9,477	'	9,477	'
Unrealized and realized gains and losses on available-for-sale securities	'	-39	'	-39
Other comprehensive income	9,905	1,966	9,980	3,708
Comprehensive income (loss) attributable to Westmoreland Coal Company	-53,249	4,183	-72,205	1,838
Co-Issuer	'	'	'	'
Condensed Financial Statements, Captions [Line Items]	'	'	'	'
Net income (loss)	-9,544	4,833	-7,842	3,829
Other comprehensive income (loss)	'	'	'	'
Amortization of accumulated actuarial gains or losses, pension	2	8	4	14
Amortization of accumulated actuarial gains or losses, transition obligations, and prior service costs, postretirement medical benefit	0	0	0	0
Tax effect of other comprehensive income gains	0	'	0	'
Change in foreign currency translation adjustment	0	'	0	'
Unrealized and realized gains and losses on available-for-sale securities	'	0	'	0
Other comprehensive income	2	8	4	14
Comprehensive income (loss) attributable to Westmoreland Coal Company	-9,542	4,841	-7,838	3,843
Guarantor Subsidiaries	'	'	'	'
Condensed Financial Statements, Captions [Line Items]	'	'	'	'
Net income (loss)	-17,131	8,047	-9,722	18,173
Other comprehensive income (loss)	'	'	'	'
Amortization of accumulated actuarial gains or losses, pension	122	239	244	432
Amortization of accumulated actuarial gains or losses, transition obligations, and prior service costs, postretirement medical benefit	-36	214	-72	427
Tax effect of other comprehensive income gains	0	'	0	'
Change in foreign currency translation adjustment	9,477	'	9,477	'
Unrealized and realized gains and losses on available-for-sale securities	'	-40	'	-40
Other comprehensive income	9,563	413	9,649	819
Comprehensive income (loss) attributable to Westmoreland Coal Company	-7,568	8,460	-73	18,992
Non-Guarantor Subsidiaries	'	'	'	'
Condensed Financial Statements, Captions [Line Items]	'	'	'	'
Net income (loss)	171	2,657	296	1,045
Other comprehensive income (loss)	'	'	'	'
Amortization of accumulated actuarial gains or losses, pension	6	0	11	0
Amortization of accumulated actuarial gains or losses, transition obligations, and prior service costs, postretirement medical benefit	5	0	10	0
Tax effect of other comprehensive income gains	0	'	0	'
Change in foreign currency translation adjustment	0	'	0	'
Unrealized and realized gains and losses on available-for-sale securities	'	0	'	0
Other comprehensive income	11	0	21	0
Comprehensive income (loss) attributable to Westmoreland Coal Company	182	2,657	317	1,045
Consolidating Adjustments	'	'	'	'
Condensed Financial Statements, Captions [Line Items]	'	'	'	'
Net income (loss)	26,504	-15,537	17,268	-23,047
Other comprehensive income (loss)	'	'	'	'
Amortization of accumulated actuarial gains or losses, pension	-130	-247	-259	-446
Amortization of accumulated actuarial gains or losses, transition obligations, and prior service costs, postretirement medical benefit	31	-214	62	-427
Tax effect of other comprehensive income gains	0	'	0	'
Change in foreign currency translation adjustment	-9,477	'	-9,477	'
Unrealized and realized gains and losses on available-for-sale securities	'	40	'	40
Other comprehensive income	-9,576	-421	-9,674	-833
Comprehensive income (loss) attributable to Westmoreland Coal Company	$16,928	($15,958)	$7,594	($23,880)

SUPPLEMENTAL_CONSOLIDATING_FIN5

SUPPLEMENTAL CONSOLIDATING FINANCIAL INFORMATION - Supplemental Consolidating Statement of Cash Flow Information (Detail) (USD $)	6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013
Cash flows from operating activities:	'	'
Net income (loss)	($82,185,000)	($1,870,000)
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities:	'	'
Equity in income of subsidiaries	0	0
Depreciation, depletion, and amortization	40,538,000	29,823,000
Accretion of asset retirement obligation and receivable	9,288,000	6,338,000
Non-cash tax benefits	-224,000	0
Amortization of intangible assets and liabilities, net	310,000	326,000
Share-based compensation	2,445,000	3,771,000
Gain on sales of assets	-5,000	-308,000
Amortization of deferred financing costs	1,209,000	1,856,000
Loss on sales of investment securities	'	-28,000
Loss on extinguishment of debt	12,635,000	64,000
Loss (gain) on sales of investment securities	3,000	-28,000
Derivative loss	5,930,000	0
Loss on foreign exchange	4,141,000	0
Income from equity affiliates	-799,000	0
Distributions from equity affiliates	730,000	0
Changes in operating assets and liabilities:	'	'
Receivables, net	-11,270,000	3,687,000
Inventories	22,770,000	-1,977,000
Excess of black lung benefit obligation over trust assets	1,166,000	-281,000
Deferred income tax	3,854,000	0
Accounts payable and accrued expenses	8,538,000	1,701,000
Deferred revenue	-8,424,000	-6,214,000
Income tax payable	528,000	-56,000
Accrual for workers' compensation	-125,000	-284,000
Asset retirement obligations	-3,362,000	-5,424,000
Accrual for postretirement medical benefits	1,409,000	4,094,000
Pension and SERP obligations	-332,000	1,517,000
Other assets and liabilities	1,805,000	-1,811,000
Distributions received from subsidiaries	0	0
Net cash provided by operating activities	10,573,000	34,924,000
Cash flows from investing activities:	'	'
Additions to property, plant and equipment	-17,361,000	-13,467,000
Change in restricted investments and bond collateral and reclamation deposits	-30,517,000	-8,714,000
Cash payments related to Canadian acquisition	-322,637,000	0
Cash acquired in related to Canadian acquisition	8,103,000	0
Net proceeds from sales of assets	213,000	577,000
Proceeds from sale of investments	246,000	6,807,000
Increase in loan and lease receivable	-1,120,000	0
Receipts from loan and lease receivable	2,164,000	0
Receivable from customer for property and equipment purchases	0	-308,000
Other	-82,000	0
Net cash used in investing activities	-360,991,000	-15,105,000
Cash flows from financing activities:	'	'
Change in book overdrafts	1,605,000	1,777,000
Borrowings from long-term debt	454,219,000	0
Repayments of long-term debt	-97,538,000	-16,070,000
Borrowings on revolving lines of credit	10,000,000	6,000,000
Repayments on revolving lines of credit	-10,000,000	-6,000,000
Debt issuance costs and other refinancing costs	-27,053,000	-182,000
Dividends/distributions	-470,000	-680,000
Exercise of stock options	193,000	0
Transactions with Parent/affiliates	0	0
Net cash provided by (used in) financing activities	330,956,000	-15,155,000
Effect of foreign exchange rates on cash	-1,038,000	0
Net increase (decrease) in cash and cash equivalents	-20,500,000	4,664,000
Cash and cash equivalents, beginning of period	61,110,000	31,610,000
Cash and cash equivalents, end of period	40,610,000	36,274,000
Parent/ Issuer	'	'
Cash flows from operating activities:	'	'
Net income (loss)	-82,185,000	-1,870,000
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities:	'	'
Equity in income of subsidiaries	16,148,000	-27,450,000
Depreciation, depletion, and amortization	156,000	187,000
Accretion of asset retirement obligation and receivable	0	0
Non-cash tax benefits	-224,000	'
Amortization of intangible assets and liabilities, net	0	0
Share-based compensation	1,934,000	1,567,000
Gain on sales of assets	0	0
Amortization of deferred financing costs	494,000	1,541,000
Loss on sales of investment securities	'	0
Loss on extinguishment of debt	62,000	64,000
Loss (gain) on sales of investment securities	0	'
Derivative loss	0	'
Loss on foreign exchange	5,233,000	'
Income from equity affiliates	0	'
Distributions from equity affiliates	0	'
Changes in operating assets and liabilities:	'	'
Receivables, net	943,000	-227,000
Inventories	0	0
Excess of black lung benefit obligation over trust assets	1,166,000	-280,000
Deferred income tax	0	'
Accounts payable and accrued expenses	17,348,000	-1,957,000
Deferred revenue	0	0
Income tax payable	0	0
Accrual for workers' compensation	-125,000	-284,000
Asset retirement obligations	0	0
Accrual for postretirement medical benefits	-885,000	-40,000
Pension and SERP obligations	166,000	695,000
Other assets and liabilities	-7,429,000	-49,000
Distributions received from subsidiaries	76,800,000	36,600,000
Net cash provided by operating activities	29,602,000	8,497,000
Cash flows from investing activities:	'	'
Additions to property, plant and equipment	16,000	-575,000
Change in restricted investments and bond collateral and reclamation deposits	-48,188,000	-807,000
Cash payments related to Canadian acquisition	-282,788,000	'
Cash acquired in related to Canadian acquisition	0	'
Net proceeds from sales of assets	0	0
Proceeds from sale of investments	0	0
Increase in loan and lease receivable	0	'
Receipts from loan and lease receivable	0	'
Receivable from customer for property and equipment purchases	0	0
Other	0	'
Net cash used in investing activities	-330,960,000	-1,382,000
Cash flows from financing activities:	'	'
Change in book overdrafts	0	0
Borrowings from long-term debt	454,219,000	'
Repayments of long-term debt	-1,015,000	-500,000
Borrowings on revolving lines of credit	0	0
Repayments on revolving lines of credit	0	0
Debt issuance costs and other refinancing costs	-15,407,000	-26,000
Dividends/distributions	-470,000	-680,000
Exercise of stock options	193,000	'
Transactions with Parent/affiliates	-147,974,000	-5,080,000
Net cash provided by (used in) financing activities	289,546,000	-6,286,000
Effect of foreign exchange rates on cash	0	'
Net increase (decrease) in cash and cash equivalents	-11,812,000	829,000
Cash and cash equivalents, beginning of period	25,326,000	14,836,000
Cash and cash equivalents, end of period	13,514,000	15,665,000
Co-Issuer	'	'
Cash flows from operating activities:	'	'
Net income (loss)	-7,842,000	3,829,000
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities:	'	'
Equity in income of subsidiaries	0	0
Depreciation, depletion, and amortization	5,009,000	5,082,000
Accretion of asset retirement obligation and receivable	34,000	32,000
Non-cash tax benefits	0	'
Amortization of intangible assets and liabilities, net	290,000	312,000
Share-based compensation	14,000	23,000
Gain on sales of assets	0	0
Amortization of deferred financing costs	0	0
Loss on sales of investment securities	'	0
Loss on extinguishment of debt	0	0
Loss (gain) on sales of investment securities	0	'
Derivative loss	5,930,000	'
Loss on foreign exchange	0	'
Income from equity affiliates	0	'
Distributions from equity affiliates	0	'
Changes in operating assets and liabilities:	'	'
Receivables, net	-6,000	-1,995,000
Inventories	842,000	-1,632,000
Excess of black lung benefit obligation over trust assets	0	0
Deferred income tax	0	'
Accounts payable and accrued expenses	-1,101,000	4,101,000
Deferred revenue	-4,791,000	-4,190,000
Income tax payable	0	0
Accrual for workers' compensation	0	0
Asset retirement obligations	0	0
Accrual for postretirement medical benefits	0	0
Pension and SERP obligations	2,000	9,000
Other assets and liabilities	-273,000	101,000
Distributions received from subsidiaries	0	0
Net cash provided by operating activities	-1,892,000	5,672,000
Cash flows from investing activities:	'	'
Additions to property, plant and equipment	-255,000	-698,000
Change in restricted investments and bond collateral and reclamation deposits	5,998,000	-5,000
Cash payments related to Canadian acquisition	0	'
Cash acquired in related to Canadian acquisition	0	'
Net proceeds from sales of assets	0	0
Proceeds from sale of investments	0	0
Increase in loan and lease receivable	0	'
Receipts from loan and lease receivable	0	'
Receivable from customer for property and equipment purchases	0	0
Other	0	'
Net cash used in investing activities	5,743,000	-703,000
Cash flows from financing activities:	'	'
Change in book overdrafts	0	0
Borrowings from long-term debt	0	'
Repayments of long-term debt	0	0
Borrowings on revolving lines of credit	0	0
Repayments on revolving lines of credit	0	0
Debt issuance costs and other refinancing costs	0	0
Dividends/distributions	-8,500,000	-9,000,000
Exercise of stock options	0	'
Transactions with Parent/affiliates	1,723,000	-38,000
Net cash provided by (used in) financing activities	-6,777,000	-9,038,000
Effect of foreign exchange rates on cash	0	'
Net increase (decrease) in cash and cash equivalents	-2,926,000	-4,069,000
Cash and cash equivalents, beginning of period	3,341,000	4,545,000
Cash and cash equivalents, end of period	415,000	476,000
Guarantor Subsidiaries	'	'
Cash flows from operating activities:	'	'
Net income (loss)	-9,722,000	18,173,000
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities:	'	'
Equity in income of subsidiaries	0	0
Depreciation, depletion, and amortization	35,373,000	24,554,000
Accretion of asset retirement obligation and receivable	9,254,000	6,305,000
Non-cash tax benefits	0	'
Amortization of intangible assets and liabilities, net	20,000	19,000
Share-based compensation	497,000	2,181,000
Gain on sales of assets	-5,000	-308,000
Amortization of deferred financing costs	715,000	315,000
Loss on sales of investment securities	'	-28,000
Loss on extinguishment of debt	12,572,000	0
Loss (gain) on sales of investment securities	3,000	'
Derivative loss	0	'
Loss on foreign exchange	-1,092,000	'
Income from equity affiliates	-799,000	'
Distributions from equity affiliates	730,000	'
Changes in operating assets and liabilities:	'	'
Receivables, net	-18,474,000	4,419,000
Inventories	21,929,000	-345,000
Excess of black lung benefit obligation over trust assets	0	0
Deferred income tax	3,854,000	'
Accounts payable and accrued expenses	-3,164,000	904,000
Deferred revenue	-3,633,000	-2,025,000
Income tax payable	528,000	-55,000
Accrual for workers' compensation	0	0
Asset retirement obligations	-3,364,000	-5,422,000
Accrual for postretirement medical benefits	2,256,000	4,010,000
Pension and SERP obligations	-507,000	826,000
Other assets and liabilities	4,113,000	-1,489,000
Distributions received from subsidiaries	0	0
Net cash provided by operating activities	51,084,000	52,034,000
Cash flows from investing activities:	'	'
Additions to property, plant and equipment	-17,122,000	-12,189,000
Change in restricted investments and bond collateral and reclamation deposits	11,673,000	-7,902,000
Cash payments related to Canadian acquisition	-39,849,000	'
Cash acquired in related to Canadian acquisition	8,103,000	'
Net proceeds from sales of assets	213,000	577,000
Proceeds from sale of investments	246,000	6,807,000
Increase in loan and lease receivable	-1,120,000	'
Receipts from loan and lease receivable	2,164,000	'
Receivable from customer for property and equipment purchases	0	-307,000
Other	-82,000	'
Net cash used in investing activities	-35,774,000	-13,014,000
Cash flows from financing activities:	'	'
Change in book overdrafts	1,605,000	1,777,000
Borrowings from long-term debt	0	'
Repayments of long-term debt	-96,523,000	-15,561,000
Borrowings on revolving lines of credit	10,000,000	6,000,000
Repayments on revolving lines of credit	-10,000,000	-6,000,000
Debt issuance costs and other refinancing costs	-11,646,000	-156,000
Dividends/distributions	-68,300,000	-27,600,000
Exercise of stock options	0	'
Transactions with Parent/affiliates	157,581,000	8,699,000
Net cash provided by (used in) financing activities	-17,283,000	-32,841,000
Effect of foreign exchange rates on cash	-1,038,000	'
Net increase (decrease) in cash and cash equivalents	-3,011,000	6,179,000
Cash and cash equivalents, beginning of period	27,451,000	10,237,000
Cash and cash equivalents, end of period	24,440,000	16,416,000
Non-Guarantor Subsidiaries	'	'
Cash flows from operating activities:	'	'
Net income (loss)	296,000	1,045,000
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities:	'	'
Equity in income of subsidiaries	0	0
Depreciation, depletion, and amortization	0	0
Accretion of asset retirement obligation and receivable	0	1,000
Non-cash tax benefits	0	'
Amortization of intangible assets and liabilities, net	0	-5,000
Share-based compensation	0	0
Gain on sales of assets	0	0
Amortization of deferred financing costs	0	0
Loss on sales of investment securities	'	0
Loss on extinguishment of debt	1,000	0
Loss (gain) on sales of investment securities	0	'
Derivative loss	0	'
Loss on foreign exchange	0	'
Income from equity affiliates	0	'
Distributions from equity affiliates	0	'
Changes in operating assets and liabilities:	'	'
Receivables, net	4,733,000	-239,000
Inventories	-1,000	0
Excess of black lung benefit obligation over trust assets	0	-1,000
Deferred income tax	0	'
Accounts payable and accrued expenses	-4,526,000	-1,146,000
Deferred revenue	0	1,000
Income tax payable	0	-1,000
Accrual for workers' compensation	0	0
Asset retirement obligations	2,000	-2,000
Accrual for postretirement medical benefits	38,000	124,000
Pension and SERP obligations	7,000	-13,000
Other assets and liabilities	-1,193,000	-374,000
Distributions received from subsidiaries	0	0
Net cash provided by operating activities	-643,000	-610,000
Cash flows from investing activities:	'	'
Additions to property, plant and equipment	0	-4,000
Change in restricted investments and bond collateral and reclamation deposits	0	0
Cash payments related to Canadian acquisition	0	'
Cash acquired in related to Canadian acquisition	0	'
Net proceeds from sales of assets	0	0
Proceeds from sale of investments	0	0
Increase in loan and lease receivable	0	'
Receipts from loan and lease receivable	0	'
Receivable from customer for property and equipment purchases	0	-1,000
Other	0	'
Net cash used in investing activities	0	-5,000
Cash flows from financing activities:	'	'
Change in book overdrafts	0	0
Borrowings from long-term debt	0	'
Repayments of long-term debt	0	-9,000
Borrowings on revolving lines of credit	0	0
Repayments on revolving lines of credit	0	0
Debt issuance costs and other refinancing costs	0	0
Dividends/distributions	0	0
Exercise of stock options	0	'
Transactions with Parent/affiliates	-2,108,000	2,349,000
Net cash provided by (used in) financing activities	-2,108,000	2,340,000
Effect of foreign exchange rates on cash	0	'
Net increase (decrease) in cash and cash equivalents	-2,751,000	1,725,000
Cash and cash equivalents, beginning of period	4,992,000	1,992,000
Cash and cash equivalents, end of period	2,241,000	3,717,000
Consolidating Adjustments	'	'
Cash flows from operating activities:	'	'
Net income (loss)	17,268,000	-23,047,000
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities:	'	'
Equity in income of subsidiaries	-16,148,000	27,450,000
Depreciation, depletion, and amortization	0	0
Accretion of asset retirement obligation and receivable	0	0
Non-cash tax benefits	0	'
Amortization of intangible assets and liabilities, net	0	0
Share-based compensation	0	0
Gain on sales of assets	0	0
Amortization of deferred financing costs	0	0
Loss on sales of investment securities	'	0
Loss on extinguishment of debt	0	0
Loss (gain) on sales of investment securities	0	'
Derivative loss	0	'
Loss on foreign exchange	0	'
Income from equity affiliates	0	'
Distributions from equity affiliates	0	'
Changes in operating assets and liabilities:	'	'
Receivables, net	1,534,000	1,729,000
Inventories	0	0
Excess of black lung benefit obligation over trust assets	0	0
Deferred income tax	0	'
Accounts payable and accrued expenses	-19,000	-201,000
Deferred revenue	0	0
Income tax payable	0	0
Accrual for workers' compensation	0	0
Asset retirement obligations	0	0
Accrual for postretirement medical benefits	0	0
Pension and SERP obligations	0	0
Other assets and liabilities	6,587,000	0
Distributions received from subsidiaries	-76,800,000	-36,600,000
Net cash provided by operating activities	-67,578,000	-30,669,000
Cash flows from investing activities:	'	'
Additions to property, plant and equipment	0	-1,000
Change in restricted investments and bond collateral and reclamation deposits	0	0
Cash payments related to Canadian acquisition	0	'
Cash acquired in related to Canadian acquisition	0	'
Net proceeds from sales of assets	0	0
Proceeds from sale of investments	0	0
Increase in loan and lease receivable	0	'
Receipts from loan and lease receivable	0	'
Receivable from customer for property and equipment purchases	0	0
Other	0	'
Net cash used in investing activities	0	-1,000
Cash flows from financing activities:	'	'
Change in book overdrafts	0	0
Borrowings from long-term debt	0	'
Repayments of long-term debt	0	0
Borrowings on revolving lines of credit	0	0
Repayments on revolving lines of credit	0	0
Debt issuance costs and other refinancing costs	0	0
Dividends/distributions	76,800,000	36,600,000
Exercise of stock options	0	'
Transactions with Parent/affiliates	-9,222,000	-5,930,000
Net cash provided by (used in) financing activities	67,578,000	30,670,000
Effect of foreign exchange rates on cash	0	'
Net increase (decrease) in cash and cash equivalents	0	0
Cash and cash equivalents, beginning of period	0	0
Cash and cash equivalents, end of period	$0	$0