Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013
Current assets:
Cash and cash equivalents	$ 61,900	$ 61,110
Receivables:
Trade	64,715	66,196
Contractual third-party reclamation receivables	8,213	8,487
Other	1,375	5,086
Total receivables	74,303	79,769
Inventories	35,447	39,972
Restricted investments and bond collateral	16,900	5,998
Other current assets	16,643	18,190
Total current assets	205,193	205,039
Property, plant and equipment:
Land and mineral rights	278,198	278,188
Plant and equipment	673,189	657,696
Gross property, plant and equipment	951,387	935,884
Less accumulated depreciation, depletion and amortization	461,754	445,848
Net property, plant and equipment	489,633	490,036
Advanced coal royalties	7,263	7,311
Reclamation deposits	75,315	74,921
Total restricted investments and bond collateral, less current portion	523,483	69,235
Contractual third-party reclamation receivables, less current portion	88,036	88,303
Intangible assets, net of accumulated amortization of $14.5 million and $14.1 million at March 31, 2014 and December 31, 2013, respectively	1,099	1,520
Other assets	17,125	10,320
Total Assets	1,407,147	946,685
Current liabilities:
Current installments of long-term debt	48,586	44,343
Accounts payable and accrued expenses:
Trade	62,598	57,507
Production taxes	46,794	41,905
Workers' compensation	712	717
Postretirement medical benefits	13,955	13,955
SERP	390	390
Deferred revenue	16,034	14,068
Asset retirement obligations	22,227	23,353
Other current liabilities	24,390	16,790
Total current liabilities	235,686	213,028
Long-term debt, less current installments	751,645	295,494
Workers' compensation, less current portion	6,680	6,744
Excess of black lung benefit obligation over trust assets	9,376	8,675
Postretirement medical benefits, less current portion	271,275	270,374
Pension and SERP obligations, less current portion	23,524	24,176
Deferred revenue, less current portion	43,299	46,567
Asset retirement obligations, less current portion	259,036	256,511
Intangible liabilities, net of accumulated amortization of $12.7 million and $12.4 million at March 31, 2014 and December 31, 2013, respectively	5,339	5,606
Other liabilities	7,503	7,389
Total liabilities	1,613,363	1,134,564
Shareholders' deficit:
Preferred stock of $1.00 par value Authorized 5,000,000 shares; Issued and outstanding 121,223 shares at March 31, 2014 and 159,960 at December 31, 2013	121	160
Common stock of $2.50 par value Authorized 30,000,000 shares; Issued and outstanding 14,862,595 shares at March 31, 2014 and 14,592,231 shares at December 31, 2013	37,155	36,479
Other paid-in capital	134,952	134,861
Accumulated other comprehensive loss	(63,369)	(63,595)
Accumulated deficit	(315,075)	(295,784)
Total shareholders’ deficit	(206,216)	(187,879)
Total Liabilities and Shareholders' Deficit	$ 1,407,147	$ 946,685