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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
CASH FLOWS FROM OPERATING ACTIVITIES:    
Net income (loss) $ 12,775 $ (83,951)
Adjustments to reconcile net loss to net cash provided by operating activities:    
Unrealized loss on forward and derivative contracts 6,918 (330)
Unrealized gain on contingent obligation (1,059) (1,059)
Lower of cost or NRV inventory adjustment (4,102) 1,499
Depreciation and amortization 63,091 63,306
Ravenswood (gains) losses (5,500) 3,830
Pension and other postretirement benefits 2,292 1,682
Deferred income taxes 724 (8,520)
Stock-based compensation 1,455 1,134
Equity in earnings of joint ventures, net of dividends (359) (891)
Change in operating assets and liabilities:    
Accounts receivable - net (27,935) (1,712)
Due from affiliates 4,802 3,146
Inventories (24,091) (1,265)
Prepaid and other current assets 1,108 9,016
Accounts payable, trade 4,571 (5,028)
Due to affiliates 1,523 4,628
Accrued and other current liabilities 9,252 4,769
Ravenswood retiree medical settlement (5,000) 23,000
Other - net 10,202 2,073
Net cash provided by operating activities 50,667 15,327
CASH FLOWS FROM INVESTING ACTIVITIES:    
Purchase of property, plant and equipment (23,590) (13,127)
Proceeds from sales of property, plant & equipment 14,452 0
Net cash used in investing activities (9,138) (13,127)
CASH FLOWS FROM FINANCING ACTIVITIES:    
Borrowings under revolving credit facilities 1,022 900
Repayments under revolving credit facilities (1,022) (900)
Issuance of common stock 281 0
Net cash provided by financing activities 281 0
CHANGE IN CASH AND CASH EQUIVALENTS 41,810 2,200
Cash and cash equivalents, beginning of period 132,403 115,393
Cash and cash equivalents, end of period $ 174,213 $ 117,593