Unaudited Condensed Consolidated Statements of Income - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Income Statement [Abstract]
Net sales	$ 287,996	$ 259,437	$ 854,682	$ 762,209
Cost of sales	154,787	151,152	470,938	454,595
Gross profit	133,209	108,285	383,744	307,614
Selling, general and administrative expenses	65,493	58,664	190,849	165,723
Provision for legal settlement	32,000	0	32,000	0
Operating income	35,716	49,621	160,895	141,891
Interest expense, net	3,629	3,722	10,872	11,097
Income before income taxes	32,087	45,899	150,023	130,794
Provision for income taxes	10,605	18,833	54,584	51,044
Net income	$ 21,482	$ 27,066	$ 95,439	$ 79,750
Basic net income per common share (in usd per share)	$ 0.11	$ 0.14	$ 0.49	$ 0.41
Diluted net income per common share (in usd per share)	$ 0.11	$ 0.14	$ 0.48	$ 0.40
Basic weighted average shares	196,445,684	196,062,348	196,311,529	195,852,404
Diluted weighted average shares	199,452,308	198,254,808	199,290,017	198,028,543