Joint Venture - Operating Results (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Schedule of Equity Method Investments [Line Items]
Net sales	$ 245,469	$ 253,713	$ 748,371	$ 819,837
Cost of materials	184,417	186,758	564,513	607,650
Income (loss) before taxes	(10,095)	(11,182)	(104,539)	(34,787)
Net (Loss) Income	(7,325)	(6,911)	(95,621)	(21,332)
Joint venture
Schedule of Equity Method Investments [Line Items]
Net sales	68,202	57,446	196,061	172,226
Cost of materials	56,446	47,356	162,849	143,727
Income (loss) before taxes	5,921	4,284	15,364	11,335
Net (Loss) Income	$ 4,426	$ 3,706	$ 11,828	$ 9,632