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CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $)
In Thousands, unless otherwise specified
 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
CASH FLOWS FROM OPERATING ACTIVITIES:    
Net income (loss) $ 50,645 $ (30,638)
Adjustments to reconcile net income (loss) to net cash provided by operating activities:    
Unrealized net gain on forward contracts 0 (762)
Gain on bargain purchase 0 (5,253)
Unrealized gain on E.ON contingent obligation (1,059) (16,428)
Accrued and other plant curtailment costs — net 3,267 3,380
Lower of cost or market inventory adjustment (1,247) 10,286
Depreciation 52,784 49,082
Sebree power contract amortization (5,534) (14,461)
Debt discount amortization 268 586
Pension and other postretirement benefits 1,432 (2,674)
Deferred income taxes 6,502 (1,532)
Stock-based compensation 957 961
Loss on early extinguishment of debt 0 3,272
Equity in earnings of joint ventures, net of dividends (661) (2,118)
Change in operating assets and liabilities:    
Accounts receivable — net 5,608 (1,063)
Due from affiliates (8,866) 12,915
Inventories (889) (22,848)
Prepaid and other current assets 3,035 (4,892)
Accounts payable, trade (8,885) 26,547
Due to affiliates 11,336 32,002
Accrued and other current liabilities (7,566) 2,209
Other — net (3,413) 3,887
Net cash provided by operating activities 97,714 42,458
CASH FLOWS FROM INVESTING ACTIVITIES:    
Purchase of property, plant and equipment (26,865) (31,994)
Nordural expansion — Helguvik (277) (2,855)
Purchase of carbon anode assets and improvements (12,280) (8,519)
Purchase of Sebree smelter (1,042) (48,058)
Proceeds from sale of property, plant and equipment 46 515
Restricted and other cash deposits 480 (3,015)
Net cash used in investing activities (39,938) (93,926)
CASH FLOWS FROM FINANCING ACTIVITIES:    
Repayment of debt (2,603) (249,604)
Proceeds from issuance of debt 0 246,330
Borrowings under revolving credit facilities 91,731 16,725
Repayments under revolving credit facilities (97,731) 0
Debt issuance costs 0 (3,994)
Debt retirement costs 0 (1,208)
Issuance of common stock 149 44
Net cash provided by (used in) financing activities (8,454) 8,293
CHANGE IN CASH AND CASH EQUIVALENTS 49,322 (43,175)
Cash and cash equivalents, beginning of period 84,088 183,976
Cash and cash equivalents, end of period $ 133,410 $ 140,801