Consolidated Statements Of Financial Position (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
CURRENT ASSETS:
Cash and cash equivalents	$ 626	$ 423
Accounts receivable, net of allowance for doubtful accounts ($724 as of December 31, 2014 and $0 as of December 31, 2013)	22,467us-gaap_AccountsReceivableNetCurrent	25,461us-gaap_AccountsReceivableNetCurrent
Inventories	13,030us-gaap_InventoryNet	18,580us-gaap_InventoryNet
Advance royalties, current portion	1,032us-gaap_PrepaidRoyalties	179us-gaap_PrepaidRoyalties
Prepaid expenses and other	3,974	4,572
Current assets held for sale		454
Total current assets	41,129us-gaap_AssetsCurrent	49,669us-gaap_AssetsCurrent
PROPERTY, PLANT AND EQUIPMENT:
At cost, including coal properties, mine development and construction costs	663,662us-gaap_PropertyPlantAndEquipmentGross	674,708us-gaap_PropertyPlantAndEquipmentGross
Less accumulated depreciation, depletion and amortization	(280,225)	(249,718)
Net property, plant and equipment	383,437us-gaap_PropertyPlantAndEquipmentNet	424,990us-gaap_PropertyPlantAndEquipmentNet
Advance royalties, net of current portion	1,363	5,580
Investment in unconsolidated affiliates	20,653	21,243
Intangible assets, net	1,067us-gaap_FiniteLivedIntangibleAssetsNet	1,148us-gaap_FiniteLivedIntangibleAssetsNet
Other non-current assets	16,410us-gaap_OtherAssetsNoncurrent	9,640us-gaap_OtherAssetsNoncurrent
Non-current assets held for sale	9,279	55,497
TOTAL	473,338us-gaap_Assets	567,767us-gaap_Assets
CURRENT LIABILITIES:
Accounts payable	10,924us-gaap_AccountsPayableCurrent	17,710us-gaap_AccountsPayableCurrent
Accrued expenses and other	17,334	20,567
Current portion of long-term debt	210us-gaap_LongTermDebtCurrent	1,024us-gaap_LongTermDebtCurrent
Current portion of asset retirement obligations	1,431us-gaap_AccruedReclamationCostsCurrent	1,614us-gaap_AccruedReclamationCostsCurrent
Current portion of postretirement benefits	425	334
Current liabilities held for sale		5,241
Total current liabilities	30,324us-gaap_LiabilitiesCurrent	46,490us-gaap_LiabilitiesCurrent
NON-CURRENT LIABILITIES:
Long-term debt, net of current portion	57,222us-gaap_LongTermDebtNoncurrent	170,022us-gaap_LongTermDebtNoncurrent
Asset retirement obligations, net of current portion	28,452	32,837
Other non-current liabilities	27,942us-gaap_OtherLiabilitiesNoncurrent	16,220us-gaap_OtherLiabilitiesNoncurrent
Postretirement benefits, net of current portion	6,223	5,786
Non-current liabilities held for sale	2,250	41
Total non-current liabilities	122,089us-gaap_LiabilitiesNoncurrent	224,906us-gaap_LiabilitiesNoncurrent
Total liabilities	152,413us-gaap_Liabilities	271,396us-gaap_Liabilities
COMMITMENTS AND CONTINGENCIES (NOTE 15)
PARTNERS' CAPITAL:
Limited partners	308,586	283,339
General partner	10,966	10,801
Accumulated other comprehensive income	1,373	2,231
Total partners' capital	320,925us-gaap_PartnersCapital	296,371us-gaap_PartnersCapital
TOTAL	$ 473,338	$ 567,767

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