Condensed Consolidated Statements of Comprehensive Income (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Income Statement [Abstract]
Net sales	$ 95,502	$ 72,249	$ 317,458	$ 278,680
Cost of sales	65,133	72,098	203,897	199,747
Gross profit	30,369	151	113,561	78,933
Selling, general and administrative expenses	15,902	15,375	54,468	58,609
Income (loss) from operations	14,467	(15,224)	59,093	20,324
Interest expense, net	167	70	791	531
Income (loss) before income taxes	14,300	(15,294)	58,302	19,793
Provision for income taxes	5,387	4	21,934	298
Net income (loss)	8,913	(15,298)	36,368	19,495
Basic earnings (loss) per common share	$ 0.28	$ (0.45)	$ 1.12	$ 0.58
Basic weighted average common shares outstanding	31,606,264	33,660,212	32,538,832	33,772,710
Diluted earnings (loss) per common share	$ 0.28	$ (0.45)	$ 1.10	$ 0.56
Diluted weighted average common shares outstanding	32,008,781	33,660,212	32,966,317	34,506,910
Comprehensive income (loss)	$ 8,913	$ (15,298)	$ 36,368	$ 19,495