CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ 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	$ 573,366	$ 549,696	$ 1,126,918	$ 1,052,268
Cost of sales	316,441	305,638	619,052	584,875
Gross profit	256,925	244,058	507,866	467,393
Selling, general and administrative expenses	131,792	130,235	262,265	250,225
Restructuring expenses	0	0	4,797	0
Operating income	125,133	113,823	240,804	217,168
Other (income) expense - net	372	(1,027)	64	(983)
Interest expense	11,304	11,205	22,856	21,694
Income before income taxes	113,457	103,645	217,884	196,457
Provision for income taxes	29,613	27,886	58,141	52,568
Net income	$ 83,844	$ 75,759	$ 159,743	$ 143,889
Basic earnings per common share (in dollars per share)	$ 1.10	$ 1.00	$ 2.09	$ 1.89
Diluted earnings per common share (in dollars per share)	$ 1.08	$ 0.99	$ 2.07	$ 1.87
Share data:
Basic weighted average common shares outstanding (in shares)	76,220	75,690	76,167	75,719
Diluted weighted average common shares outstanding (in shares)	77,320	76,674	77,107	76,687