CONDENSED CONSOLIDATED BALANCE SHEETS (USD $) In Thousands, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012
Current assets:
Cash and cash equivalents	$ 46,546	$ 4,044
Receivables, net	25,015	66,356
Refundable income taxes	1,672	2,146
Inventories	38,562	56,240
Spare parts	9,664	29,304
Other current assets	2,071	8,766
Assets of discontinued operations - current	5,287
Total current assets	128,817	166,856
Property, plant, and equipment, net	289,880	460,656
Deferred income taxes	48,702	19,496
Other assets	52,264	53,707
Assets of discontinued operations - long-term	6,417
Total Assets	526,080	700,715
Current liabilities:
Accounts payable	31,094	50,072
Deferred income taxes	7,991
Accrued and other liabilities	31,370	48,114
Liabilities of discontinued operations - current	7,056	833
Total current liabilities	77,511	99,019
Long-term debt	150,000	196,200
Post-retirement benefits	48,001	91,591
Pension	87,296	81,411
Other noncurrent liabilities	18,829	26,993
Noncurrent liabilities of discontinued operations	2,164
Total liabilities	383,801	495,214
Stockholders' equity	142,279	205,501
Total Liabilities and Stockholders' Equity	$ 526,080	$ 700,715