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CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $)
In Thousands, unless otherwise specified
 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
CASH FLOWS FROM OPERATING ACTIVITIES:    
Net income (loss) $ 240 $ (21,131)
Adjustments to reconcile net income (loss) to net cash provided by operating activities:    
Unrealized net gain on forward contracts 0 (397)
Gain on bargain purchase 0 (5,253)
Unrealized gain on E.ON contingent obligation (706) (16,075)
Accrued and other plant curtailment costs — net 2,181 2,268
Lower of cost or market inventory adjustment (1,247) 16,049
Depreciation 35,143 31,898
Sebree power contract amortization (5,534) (2,741)
Debt discount amortization 177 502
Pension and other postretirement benefits 2,368 (3,616)
Deferred income taxes (2,731) 2,038
Stock-based compensation 533 499
Loss on early extinguishment of debt 0 3,272
Equity in earnings of joint ventures, net of dividends (376) (1,387)
Change in operating assets and liabilities:    
Accounts receivable — net 3,931 (33,883)
Due from affiliates (10,508) 12,906
Inventories (2,786) (22,334)
Prepaid and other current assets 6,816 (3,281)
Accounts payable, trade (8,413) 30,696
Due to affiliates (1,226) 27,607
Accrued and other current liabilities (12,200) (3,827)
Other — net (2,496) 13,242
Net cash provided by operating activities 8,628 22,976
CASH FLOWS FROM INVESTING ACTIVITIES:    
Purchase of property, plant and equipment (16,758) (16,565)
Nordural expansion — Helguvik (186) (2,559)
Purchase of carbon anode assets and improvements (7,226) (3,670)
Purchase of Sebree smelter 0 (48,058)
Proceeds from sale of property, plant and equipment 46 515
Restricted and other cash deposits (1,334) (720)
Net cash used in investing activities (25,458) (71,057)
CASH FLOWS FROM FINANCING ACTIVITIES:    
Repayment of debt 0 (249,604)
Proceeds from issuance of debt 0 246,330
Borrowings under revolving credit facilities 86,646 0
Repayments under revolving credit facilities (92,646) 0
Debt issuance costs 0 (3,926)
Debt retirement costs 0 (1,208)
Issuance of common stock 126 44
Net cash used in financing activities (5,874) (8,364)
CHANGE IN CASH AND CASH EQUIVALENTS (22,704) (56,445)
Cash and cash equivalents, beginning of period 84,088 183,976
Cash and cash equivalents, end of period $ 61,384 $ 127,531