Condensed Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013
Assets:
Cash	$ 31,703	$ 42,700
Restricted cash	99	543
Accounts receivable (net of $12.3 million and $13.1 million allowance for doubtful accounts, respectively)	78,972	89,248
Prepaid expenses	23,421	26,552
Other current assets	3,472	3,876
Deferred income tax, net	15,833	18,250
Total current assets	153,500	181,169
Property, plant and equipment (net of $938.7 million and $886.2 million accumulated depreciation, respectively)	1,278,793	1,301,292
Intangible assets (net of $35.4 million and $32.7 million accumulated amortization, respectively)	103,131	105,886
Debt issue costs, net	6,821	7,101
Restricted cash	651	651
Other assets	3,503	3,799
Total assets	1,546,399	1,599,898
Liabilities and Stockholders’ Deficit:
Current portion of long-term debt	6,400	6,400
Current portion of capital lease obligations	1,221	1,445
Accounts payable	30,647	37,876
Claims payable and estimated claims accrual	256	256
Accrued interest payable	3,414	9,977
Accrued payroll and related expenses	34,381	34,897
Other accrued liabilities	51,905	55,994
Total current liabilities	128,224	146,845
Capital lease obligations	326	447
Accrued pension obligations	150,666	153,534
Accrued post-retirement healthcare obligations	597,241	584,734
Deferred income taxes	73,889	85,948
Other long-term liabilities	24,052	25,864
Long-term debt, net of current portion	910,815	911,722
Total long-term liabilities	1,756,989	1,762,249
Total liabilities	1,885,213	1,909,094
Commitments and contingencies (See Note 14)
Stockholders’ deficit:
Common stock, $0.01 par value, 37,500,000 shares authorized, 26,681,236 and 26,480,837 shares issued and outstanding at March 31, 2014 and December 31, 2013, respectively	266	264
Additional paid-in capital	514,049	512,008
Retained deficit	(693,926)	(661,689)
Accumulated other comprehensive loss	(159,203)	(159,779)
Total stockholders’ deficit	(338,814)	(309,196)
Total liabilities and stockholders’ deficit	$ 1,546,399	$ 1,599,898