CONDENSED CONSOLIDATED BALANCE SHEETS (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Current assets:
Cash and cash equivalents	$ 3,338	$ 4,044
Receivables, net	74,073	66,356
Refundable income taxes	1,216	2,146
Inventories	66,326	56,240
Spare parts	25,223	29,304
Deferred income taxes	8,762	5,703
Other current assets	2,529	3,063
Total current assets	181,467	166,856
Property, plant, and equipment - net	429,521	460,656
Deferred income taxes	34,027	19,496
Other assets	52,884	53,707
Total Assets	697,899	700,715
Current liabilities:
Accounts payable	54,345	50,072
Accrued and other liabilities	43,652	48,114
Liabilities of discontinued operations - current	175	833
Total current liabilities	98,172	99,019
Long-term debt	220,500	196,200
Post-retirement benefits	91,956	91,591
Pension	81,147	81,411
Other noncurrent liabilities	28,368	26,993
Total liabilities	520,143	495,214
Stockholders' equity	177,756	205,501
Total Liabilities and Stockholders' Equity	$ 697,899	$ 700,715