Joint Venture - Operating Results (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Schedule of Equity Method Investments [Line Items]
Net sales	$ 184,676	$ 245,469	$ 606,607	$ 748,371
Cost of materials	137,770	184,417	478,283	564,513
Income (loss) before taxes	(26,317)	(10,095)	(105,037)	(104,539)
Net (Loss) Income	(26,300)	(7,325)	(105,926)	(95,621)
Joint venture
Schedule of Equity Method Investments [Line Items]
Net sales	36,885	68,202	130,505	196,061
Cost of materials	31,339	56,446	110,734	162,849
Income (loss) before taxes	(3,117)	5,921	(367)	15,364
Net (Loss) Income	$ (2,920)	$ 4,426	$ (268)	$ 11,828