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CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
CASH FLOWS FROM OPERATING ACTIVITIES:      
Net income (loss) $ 11,325 $ 59,971 $ (205,982)
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities:      
Unrealized net loss (gain) on forward contracts (750) 10,030 11,956
Unrealized gain on contractual receivable 0 0 (81,557)
Realized benefit of contractual receivable 0 55,703 26,025
Write-off of intangible asset 0 0 23,759
Accrued and other plant curtailment costs - net (13,928) (56,010) 9,940
Lower of cost or market inventory adjustment 19,766 (426) (47,152)
Depreciation and amortization 62,194 63,550 72,624
Debt discount amortization 1,857 3,150 7,022
Deferred income taxes 2,494 15,552 44,952
Pension and other postretirement benefits (28,757) 14,578 12,952
Stock-based compensation 2,856 1,905 3,338
Non-cash loss on early extinguishment and modification of debt 763 0 2,325
Non-cash loss from disposition of equity investments 0 0 73,234
Non-cash contingent obligation 0 13,091 0
Undistributed earnings of joint ventures (3,445) (3,558) (5,038)
Change in operating assets and liabilities:      
Accounts receivable - net (3,744) (6,197) 23,154
Sale of short-term trading securities 0 0 13,686
Due from affiliates 10,694 (38,191) 21,625
Inventories (35,819) (24,009) 35,766
Prepaid and other current assets (20,791) 13,412 44,847
Accounts payable, trade (904) 11,674 (17,596)
Due to affiliates (3,477) 12,685 (11,961)
Accrued and other current liabilities 425 (1,758) (15,448)
Other - net (3,695) (13,642) (3,072)
Net cash provided by (used in) operating activities (2,936) 131,510 39,399
CASH FLOWS FROM INVESTING ACTIVITIES:      
Purchase of property, plant and equipment (20,100) (12,241) (16,935)
Nordural expansion (12,882) (19,227) (21,981)
Investments in and advances to joint ventures (113) (32) (1,044)
Payment received on advances from joint ventures 3,056 0 1,761
Proceeds from sale of property, plant and equipment 1,471 823 0
Restricted and other cash deposits 3,673 5,206 (8,014)
Net cash used in investing activities (24,895) (25,471) (46,213)
CASH FLOWS FROM FINANCING ACTIVITIES:      
Repayment of debt (47,067) 0 0
Repayment of contingent obligation (189) 0 0
Borrowings under revolving credit facility 15,900 0 0
Repayments under revolving credit facility (15,900) 0 (25,000)
Financing fees 0 0 (2,429)
Repurchase of common stock (45,891) 0 0
Issuance of common stock, net 83 23 103,077
Net cash provided by (used in) financing activities (93,064) 23 75,648
CHANGE IN CASH AND CASH EQUIVALENTS (120,895) 106,062 68,834
Cash and cash equivalents, beginning of the period 304,296 198,234 129,400
Cash and cash equivalents, end of the period $ 183,401 $ 304,296 $ 198,234