Unaudited Condensed Consolidated Statements of 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	$ 286,850	$ 253,998	$ 566,686	$ 502,772
Cost of sales	159,547	154,203	316,151	303,443
Gross profit	127,303	99,795	250,535	199,329
Selling, general and administrative expenses	65,600	59,660	125,356	107,059
Operating income	61,703	40,135	125,179	92,270
Interest expense, net	3,606	3,692	7,243	7,375
Income before income taxes	58,097	36,443	117,936	84,895
Provision for income taxes	21,473	13,805	43,979	32,211
Net income	$ 36,624	$ 22,638	$ 73,957	$ 52,684
Basic net income per common share (in usd per share)	$ 0.19	$ 0.12	$ 0.38	$ 0.27
Diluted net income per common share (in usd per share)	$ 0.18	$ 0.11	$ 0.37	$ 0.27
Basic weighted average shares	196,270,119	195,747,954	196,243,714	195,746,817
Diluted weighted average shares	198,441,315	197,709,082	198,324,006	197,747,647