Condensed Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Mar. 31, 2012	Dec. 31, 2011
Current assets:
Cash	$ 35,795	$ 17,350
Restricted cash	17,902	24,446
Accounts receivable, net	102,150	104,298
Prepaid expenses	15,924	18,346
Other current assets	2,701	3,312
Deferred income tax, net	17,915	17,915
Total current assets	192,387	185,667
Property, plant and equipment (net of $368.2 million and $280.5 million accumulated depreciation, respectively)	1,598,842	1,663,065
Intangible assets (net of $13.2 million and $10.4 million accumulated amortization, respectively)	125,357	128,145
Debt issue costs, net	1,613	1,779
Restricted cash	651	651
Other assets	10,282	10,338
Total assets	1,929,132	1,989,645
Liabilities and Stockholders' Deficit
Current portion of long-term debt	10,000	10,000
Current portion of capital lease obligations	1,238	1,252
Accounts payable	68,260	65,184
Claims payable and estimated claims accrual	10,221	22,839
Accrued interest payable	502	508
Other accrued liabilities	64,076	54,348
Total current liabilities	154,297	154,131
Capital lease obligations	2,379	2,690
Accrued pension obligation	156,714	157,961
Employee benefit obligations	543,886	531,634
Deferred income taxes	221,183	245,369
Other long-term liabilities	12,935	14,003
Long-term debt, net of current portion	987,500	990,000
Total long-term liabilities	1,924,597	1,941,657
Total liabilities	2,078,894	2,095,788
Commitments and contingencies (See Note 11)
Stockholders' deficit:
Common stock, $0.01 par value, 37,500,000 shares authorized, 26,215,302 and 26,197,142 shares issued and outstanding at March 31, 2012 and December 31, 2011, respectively	262	262
Additional paid-in capital	503,057	502,034
Retained deficit	(461,657)	(414,945)
Accumulated other comprehensive loss	(191,424)	(193,494)
Total stockholders' deficit	(149,762)	(106,143)
Total liabilities and stockholders' deficit	$ 1,929,132	$ 1,989,645