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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
CASH FLOWS FROM OPERATING ACTIVITIES:      
Net income (loss) $ 48,580 $ (252,415) $ (59,310)
Adjustments to reconcile net income (loss) to net cash provided by operating activities:      
Unrealized gain on fair value of contingent consideration 0 0 (18,337)
Unrealized gain on contingent obligation (1,411) (1,411) (1,411)
Lower of cost or NRV inventory adjustment (1,073) (660) 7,539
Depreciation and amortization 84,249 84,780 80,117
Helguvik (gains) losses (7,310) 152,220 0
Ravenswood (gains) losses (5,500) 3,830 30,850
BHH impairment 0 0 11,584
Pension and other postretirement benefits (1,772) 2,863 (4,991)
Deferred income taxes (4,610) (893) (178)
Stock-based compensation 1,851 1,502 1,844
Other non-cash items - net (792) (367) (806)
Change in operating assets and liabilities:      
Accounts receivable - net (30,639) (2,957) 68,192
Due from affiliates 6,285 766 14,086
Inventories (67,534) 919 44,896
Prepaid and other current assets 7,796 18,313 (144)
Accounts payable, trade 4,746 2,271 (60,583)
Due to affiliates 4,833 7,212 (12,216)
Accrued and other current liabilities 14,478 (3,900) (31,540)
Pension contribution - Mt. Holly 0 0 (34,595)
Ravenswood retiree legal settlement (5,000) 23,000 0
Other - net 4,582 3,100 (3,131)
Net cash provided by operating activities 51,759 38,173 31,866
CASH FLOWS FROM INVESTING ACTIVITIES:      
Purchase of property, plant and equipment (31,839) (21,944) (54,700)
Purchase of remaining interest in Mt. Holly smelter 0 0 11,313
Proceeds from sale of property, plant and equipment 14,484 1,040 14
Restricted and other cash deposits 0 (259) 10
Net cash used in investing activities (17,355) (21,163) (43,363)
CASH FLOWS FROM FINANCING ACTIVITIES:      
Borrowings under revolving credit facilities 1,281 1,179 1,737
Repayments under revolving credit facilities (1,281) (1,179) (1,737)
Issuance of common stock 404 0 0
Repurchase of common stock 0 0 (36,352)
Net cash provided by (used in) financing activities 404 0 (36,352)
CHANGE IN CASH AND CASH EQUIVALENTS 34,808 17,010 (47,849)
Cash and cash equivalents, beginning of period 132,403 115,393 163,242
Cash and cash equivalents, end of period $ 167,211 $ 132,403 $ 115,393