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CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
CASH FLOWS FROM OPERATING ACTIVITIES:    
Net loss $ (15,139) $ (16,163)
Adjustments to reconcile net loss to net cash provided by operating activities:    
Unrealized loss on forward and derivative contracts 13,978 0
Unrealized gain on E.ON contingent obligation (353) (353)
Lower of cost or market inventory adjustment (3,880) (5,784)
Depreciation and amortization 20,938 21,260
Pension and other postretirement benefits 1,576 632
Deferred income taxes (95) (3,587)
Stock-based compensation 477 321
Equity in earnings of joint ventures, net of dividends (393) (357)
Change in operating assets and liabilities:    
Accounts receivable - net (23,793) (3,193)
Due from affiliates 4,862 1,939
Inventories (4,677) 17,648
Prepaid and other current assets 4,726 14,290
Accounts payable, trade (4,377) (5,983)
Due to affiliates 3,296 (5,372)
Accrued and other current liabilities (4,905) 1,253
Other - net (3,585) (1,648)
Net cash (used in) provided by operating activities (11,344) 14,903
CASH FLOWS FROM INVESTING ACTIVITIES:    
Purchase of property, plant and equipment (9,045) (3,835)
Proceeds from sale of Ravenswood 13,585 0
Restricted and other cash deposits 253 0
Net cash provided by (used in) investing activities 4,793 (3,835)
CASH FLOWS FROM FINANCING ACTIVITIES:    
Borrowings under revolving credit facilities 233 371
Repayments under revolving credit facilities (233) (371)
Issuance of common stock 43 0
Net cash provided by financing activities 43 0
CHANGE IN CASH AND CASH EQUIVALENTS (6,508) 11,068
Cash and cash equivalents, beginning of period 132,403 115,393
Cash and cash equivalents, end of period $ 125,895 $ 126,461