Condensed Consolidated Statements of Comprehensive Income (Unaudited) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Condensed Consolidated Statements of Comprehensive Income [Abstract]
Net sales	$ 107,880	$ 96,100
Cost of sales	66,020	60,681
Gross profit	41,860	35,419
Selling, general and administrative expenses	19,842	18,601
Income from operations	22,018	16,818
Interest expense, net	251	4,411
Income before income taxes	21,767	12,407
Provision for income taxes	198	96
Net income	21,569	12,311
Basic earnings per common share	$ 1.28	$ 0.80
Basic weighted average common shares outstanding	16,883,111	15,473,777
Diluted earnings per common share	$ 1.25	$ 0.74
Diluted weighted average common shares outstanding	17,280,445	16,717,987
Comprehensive income	$ 21,569	$ 12,311