Unaudited Condensed Consolidated Statements of Income - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Income Statement [Abstract]
Net sales	$ 294,831	$ 286,850	$ 596,782	$ 566,686
Cost of sales	157,094	159,547	320,370	316,151
Gross profit	137,737	127,303	276,412	250,535
Selling, general and administrative expenses	69,423	65,600	135,612	125,356
Operating income	68,314	61,703	140,800	125,179
Interest expense, net	2,947	3,606	6,013	7,243
Other non-operating (income) expense, net	(38)	0	84	0
Income before income taxes	65,405	58,097	134,703	117,936
Provision for income taxes	22,723	21,473	47,931	43,979
Net income	$ 42,682	$ 36,624	$ 86,772	$ 73,957
Basic net income per common share (in usd per share)	$ 0.22	$ 0.19	$ 0.44	$ 0.38
Diluted net income per common share (in usd per share)	$ 0.21	$ 0.18	$ 0.43	$ 0.37
Basic weighted average shares	196,994,210	196,270,119	196,809,085	196,243,714
Diluted weighted average shares	199,618,809	198,441,315	199,572,447	198,324,006