Condensed Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Current assets:
Cash	$ 17,478	$ 23,203
Accounts receivable (net of $18.8 million and $18.9 million allowance for doubtful accounts)	5,664	6,818
Accounts receivable, net	88,590	86,999
Prepaid expenses	16,062	20,128
Other current assets	3,981	4,219
Deferred income tax, net	16,236	16,376
Assets held for sale	0	12,549
Total current assets	148,011	170,292
Property, plant and equipment (net of $722.6 million and $642.1 million accumulated depreciation, respectively)	1,381,466	1,438,309
Intangible assets (net of $24.4 million and $21.6 million accumulated amortization, respectively)	114,203	116,992
Debt issue costs, net	7,491	1,111
Restricted cash	651	651
Other assets	4,697	5,006
Total assets	1,656,519	1,732,361
Liabilities and Stockholders' Deficit
Current portion of long-term debt	6,400	10,000
Current portion of capital lease obligations	1,235	1,220
Accounts payable	63,860	57,832
Claims payable and estimated claims accrual	1,182	1,282
Accrued interest payable	9,470	176
Other accrued liabilities	60,323	72,036
Liabilities held for sale	0	407
Total current liabilities	142,470	142,953
Capital lease obligations	1,143	1,470
Accrued pension obligation	208,702	203,537
Employee benefit obligations	631,426	619,108
Deferred income taxes	106,440	127,361
Other long-term liabilities	12,526	8,745
Long-term debt, net of current portion	914,501	947,000
Total long-term liabilities	1,874,738	1,907,221
Total liabilities	2,017,208	2,050,174
Commitments and contingencies (See Note 12)
Stockholders' deficit
Common stock, $0.01 par value, 37,500,000 shares authorized, 26,477,258 and 26,288,998 shares issued and outstanding at March 31, 2013 and December 31, 2012, respectively	264	262
Additional paid-in capital	508,012	506,153
Retained deficit	(615,724)	(568,239)
Accumulated other comprehensive loss	(253,241)	(255,989)
Total stockholders' deficit	(360,689)	(317,813)
Total liabilities and stockholders' deficit	$ 1,656,519	$ 1,732,361