Condensed Consolidated Statements Of Financial Position - USD ($) $ in Thousands		Sep. 30, 2015	Dec. 31, 2014
CURRENT ASSETS:
Cash and cash equivalents		$ 114	$ 626
Accounts receivable, net of allowance for doubtful accounts ($135 as of September 30, 2015 and $724 as of December 31, 2014)		18,825	22,467
Inventories		9,657	13,030
Advance royalties, current portion		888	1,032
Prepaid expenses and other		3,385	3,974
Total current assets		32,869	41,129
PROPERTY, PLANT AND EQUIPMENT:
At cost, including coal properties, mine development and construction costs		650,628	663,662
Less accumulated depreciation, depletion and amortization		(288,328)	(280,225)
Net property, plant and equipment		362,300	383,437
Advance royalties, net of current portion		7,027	1,363
Investment in unconsolidated affiliates		7,578	20,653
Intangible assets		1,007	1,067
Other non-current assets		17,161	16,410
Non-current assets held for sale		15,699	9,279
TOTAL		443,641	473,338
CURRENT LIABILITIES:
Accounts payable		9,549	10,924
Accrued expenses and other		17,761	17,334
Current portion of long-term debt	[1]	48,221	210
Current portion of asset retirement obligations		953	1,431
Current portion of postretirement benefits		425	425
Total current liabilities		76,909	30,324
NON-CURRENT LIABILITIES:
Long-term debt, net of current portion		2,605	57,222
Asset retirement obligations, net of current portion		24,527	28,452
Other non-current liabilities		28,028	27,942
Postretirement benefits, net of current portion		6,433	6,223
Non-current liabilities held for sale		6,823	2,250
Total non-current liabilities		68,416	122,089
Total liabilities		$ 145,325	$ 152,413
COMMITMENTS AND CONTINGENCIES (NOTE 13)
PARTNERS' CAPITAL:
Limited partners		$ 286,575	$ 308,586
General partner		10,501	10,966
Accumulated other comprehensive income		1,240	1,373
Total partners' capital		298,316	320,925
TOTAL		$ 443,641	$ 473,338

[1] See Note 1 for discussion on current liability classification as of September 30, 2015.