CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ 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	$ 549,696	$ 514,881	$ 1,052,268	$ 1,017,079
Cost of sales	305,638	283,266	584,875	559,423
Gross profit	244,058	231,615	467,393	457,656
Selling, general and administrative expenses	131,082	121,706	251,860	245,990
Operating income	112,976	109,909	215,533	211,666
Other (income) expense — net	(1,874)	827	(2,618)	(896)
Interest expense	11,205	10,584	21,694	21,181
Income before income taxes	103,645	98,498	196,457	191,381
Provision for income taxes	27,886	28,913	52,568	55,842
Net income	$ 75,759	$ 69,585	$ 143,889	$ 135,539
Basic earnings per common share (in dollars per share)	$ 1.00	$ 0.89	$ 1.89	$ 1.74
Diluted earnings per common share (in dollars per share)	$ 0.99	$ 0.89	$ 1.87	$ 1.72
Share data:
Basic weighted average common shares outstanding (in shares)	75,690	77,466	75,719	77,731
Diluted weighted average common shares outstanding (in shares)	76,674	78,297	76,687	78,576