Joint Venture - Operating Results (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Schedule of Equity Method Investments [Line Items]
Net sales	$ 124,893	$ 150,571	$ 419,433	$ 505,439
Cost of materials	92,406	115,300	323,808	411,834
Net (Loss) Income	(19,986)	(27,817)	(78,126)	(89,196)
Joint venture
Schedule of Equity Method Investments [Line Items]
Net sales	17,737	36,885	79,007	130,505
Cost of materials	15,359	31,339	67,115	110,734
Income (loss) before taxes	(234)	(3,117)	267	(367)
Net (Loss) Income	$ (62)	$ (2,920)	$ 928	$ (268)