Condensed Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Income Statement [Abstract]
Net sales	$ 146,450	$ 136,779	$ 278,126	$ 257,579
Cost of sales	85,040	84,255	159,089	156,808
Gross profit	61,410	52,524	119,037	100,771
Selling, general and administrative expenses	24,795	22,472	45,407	43,064
Income from operations	36,615	30,052	73,630	57,707
Interest expense, net	458	188	1,030	325
Income before income taxes	36,157	29,864	72,600	57,382
Provision for income taxes	12,878	11,149	25,919	21,114
Net income	$ 23,279	$ 18,715	$ 46,681	$ 36,268
Basic earnings per common share	$ 0.80	$ 0.59	$ 1.58	$ 1.14
Basic weighted average common shares outstanding	29,264,362	31,735,333	29,481,042	31,709,645
Diluted earnings per common share	$ 0.79	$ 0.58	$ 1.57	$ 1.13
Diluted weighted average common shares outstanding	29,423,845	32,142,939	29,642,287	32,119,026
Comprehensive income	$ 23,279	$ 18,715	$ 46,681	$ 36,268