Joint Venture - Operating Results (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
Mar. 31, 2015	Mar. 31, 2014
Schedule of Equity Method Investments [Line Items]
Net sales	$ 222,228us-gaap_SalesRevenueNet	$ 253,410us-gaap_SalesRevenueNet
Cost of materials	168,111us-gaap_CostOfGoodsSoldDirectMaterials	188,531us-gaap_CostOfGoodsSoldDirectMaterials
Income (loss) before taxes	(21,531)	(16,049)
Net (Loss) Income	(20,706)us-gaap_NetIncomeLoss	(15,998)us-gaap_NetIncomeLoss
Joint venture
Schedule of Equity Method Investments [Line Items]
Net sales	52,606	65,251
Cost of materials	44,350	54,303
Income (loss) before taxes	1,990	4,804
Net (Loss) Income	$ 1,750	$ 3,814

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The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

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Total revenue from sale of goods and services rendered during the reporting period, in the normal course of business, reduced by sales returns and allowances, and sales discounts.

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