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CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
CASH FLOWS FROM OPERATING ACTIVITIES:    
Net income (loss) $ 8,253 $ (4,401)
Adjustments to reconcile net income (loss) to net cash provided by operating activities:    
Unrealized net (gain) loss on forward contracts (141) 4,955
Unrealized gain (loss) on E.ON obligation (15,722) 0
Accrued and other plant curtailment costs — net 1,154 1,374
Lower of cost or market inventory adjustment 5,838 (17,051)
Depreciation 15,688 15,652
Debt discount amortization 279 256
Pension and other postretirement benefits 1,443 (1,138)
Stock-based compensation 217 145
Undistributed earnings of joint ventures (951) (641)
Change in operating assets and liabilities:    
Accounts receivable — net (1,998) (2,884)
Due from affiliates (5,691) (249)
Inventories (2,728) 18,710
Prepaid and other current assets (6,072) (5,366)
Accounts payable, trade 2,264 (11,442)
Due to affiliates 10,472 (360)
Accrued and other current liabilities 7,538 7,003
Other — net 2,558 335
Net cash provided by operating activities 22,401 4,898
CASH FLOWS FROM INVESTING ACTIVITIES:    
Purchase of property, plant and equipment (9,364) (2,899)
Nordural expansion - Helguvik (1,745) (1,946)
Purchase of carbon anode assets and improvements (150) 0
Investments in and advances to joint ventures 0 (100)
Payments received on advances from joint ventures 0 3,166
Proceeds from the sale of property, plant and equipment 353 58
Net cash used in investing activities (10,906) (1,721)
CASH FLOWS FROM FINANCING ACTIVITIES:    
Borrowings under revolving credit facility 0 18,076
Repayments under revolving credit facility 0 (18,076)
Repurchase of common stock 0 (4,033)
Net cash used in financing activities 0 (4,033)
CHANGE IN CASH AND CASH EQUIVALENTS 11,495 (856)
Cash and cash equivalents, beginning of the period 183,976 183,401
Cash and cash equivalents, end of the period $ 195,471 $ 182,545