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CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2012
Mar. 31, 2011
CASH FLOWS FROM OPERATING ACTIVITIES:    
Net income (loss) $ (4,401) $ 25,046
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities:    
Unrealized net loss on forward contracts 4,955 4,715
Accrued and other plant curtailment costs — net 1,374 (9,624)
Lower of cost or market inventory adjustment (17,051) (139)
Depreciation and amortization 15,652 15,930
Debt discount amortization 256 821
Pension and other postretirement benefits (1,138) (11,064)
Stock-based compensation 145 488
Undistributed earnings of joint ventures (641) (1,219)
Change in operating assets and liabilities:    
Accounts receivable — net (2,884) 7,520
Due from affiliates (249) 8,766
Inventories 18,710 (7,924)
Prepaid and other current assets (5,366) (29,901)
Accounts payable, trade (11,442) (4,730)
Due to affiliates (360) (2,722)
Accrued and other current liabilities 7,003 3,405
Other — net 335 (2,998)
Net cash provided by (used in) operating activities 4,898 (3,630)
CASH FLOWS FROM INVESTING ACTIVITIES:    
Purchase of property, plant and equipment (2,899) (3,128)
Nordural expansion (1,946) (4,051)
Investments in and advances to joint ventures (100) 0
Payments received on advances from joint ventures 3,166 0
Proceeds from sale of property, plant and equipment 58 0
Net cash used in investing activities (1,721) (7,179)
CASH FLOWS FROM FINANCING ACTIVITIES:    
Borrowings under revolving credit facility 18,076 0
Repayments under revolving credit facility (18,076) 0
Repurchase of common stock (4,033) 0
Net cash provided by (used in) financing activities (4,033) 0
CHANGE IN CASH AND CASH EQUIVALENTS (856) (10,809)
Cash and cash equivalents, beginning of the period 183,401 304,296
Cash and cash equivalents, end of the period $ 182,545 $ 293,487