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CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
CASH FLOWS FROM OPERATING ACTIVITIES:    
Net income (loss) $ (16,163) $ 73,779
Adjustments to reconcile net income (loss) to net cash provided by operating activities:    
Unrealized gain on fair value of contingent consideration 0 (6,527)
Unrealized gain on E.ON contingent obligation (353) (353)
Lower of cost or market inventory adjustment (5,784) 0
Depreciation and amortization 21,260 18,131
Pension and other postretirement benefits 632 (984)
Deferred income taxes (3,587) 8,851
Stock-based compensation 321 405
Equity in earnings of joint ventures (357) (510)
Change in operating assets and liabilities:    
Accounts receivable - net (3,193) 72,702
Due from affiliates 1,939 (53,559)
Inventories 17,648 (14,335)
Prepaid and other current assets 14,290 5,960
Accounts payable, trade (5,983) (18,508)
Due to affiliates (5,372) 27,773
Accrued and other current liabilities 1,253 2,874
Other - net (1,648) 568
Net cash provided by operating activities 14,903 116,267
CASH FLOWS FROM INVESTING ACTIVITIES:    
Purchase of property, plant and equipment (3,835) (12,627)
Restricted and other cash deposits 0 (21,012)
Net cash used in investing activities (3,835) (33,639)
CASH FLOWS FROM FINANCING ACTIVITIES:    
Borrowings under revolving credit facilities 371 455
Repayments under revolving credit facilities (371) (455)
Repurchase of common stock 0 (19,439)
Net cash used in financing activities 0 (19,439)
CHANGE IN CASH AND CASH EQUIVALENTS 11,068 63,189
Cash and cash equivalents, beginning of period 115,393 163,242
Cash and cash equivalents, end of period $ 126,461 $ 226,431