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CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $)
In Thousands, unless otherwise specified
 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
CASH FLOWS FROM OPERATING ACTIVITIES:    
Net income (loss) $ (16,678) $ 49,032
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities:    
Unrealized net loss on forward contracts 3,177 6,170
Accrued and other plant curtailment costs — net 2,781 (16,592)
Lower of cost or market inventory adjustment (11,617) (16)
Depreciation and amortization 31,288 31,064
Debt discount amortization 523 1,355
Pension and other postretirement benefits (260) (28,608)
Stock-based compensation 212 2,501
Non-cash loss on early extinguishment and modification of debt 0 763
Undistributed earnings of joint ventures (990) (1,679)
Change in operating assets and liabilities:    
Accounts receivable — net (24,289) (10,935)
Due from affiliates 5,401 11,265
Inventories 25,040 (31,464)
Prepaid and other current assets (3,877) (28,991)
Accounts payable, trade (15,931) (1,202)
Due to affiliates 1,151 (5,834)
Accrued and other current liabilities 1,750 7,575
Other — net 704 (539)
Net cash provided by (used in) operating activities (1,615) (16,135)
CASH FLOWS FROM INVESTING ACTIVITIES:    
Purchase of property, plant and equipment (6,165) (7,353)
Nordural expansion (3,586) (7,968)
Purchase of carbon anode assets (14,524) 0
Investments in and advances to joint ventures (200) 0
Payments received on advances from joint ventures 3,166 3,056
Proceeds from the sale of property, plant and equipment 68 56
Restricted and other cash deposits 0 3,673
Net cash used in investing activities (21,241) (8,536)
CASH FLOWS FROM FINANCING ACTIVITIES:    
Repayments of debt 0 47,067
Repayments of contingent obligation 0 189
Borrowings under revolving credit facility 18,076 0
Repayments under revolving credit facility (18,076) 0
Repurchase of common stock (4,033) 0
Issuance of common stock 0 32
Net cash provided by (used in) financing activities (4,033) (47,224)
CHANGE IN CASH AND CASH EQUIVALENTS (26,889) (71,895)
Cash and cash equivalents, beginning of the period 183,401 304,296
Cash and cash equivalents, end of the period $ 156,512 $ 232,401