CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Income Statement [Abstract]
Net sales	$ 574,490	$ 530,356	$ 1,701,408	$ 1,582,624
Cost of sales	316,560	299,467	935,612	884,342
Gross profit	257,930	230,889	765,796	698,282
Selling, general and administrative expenses	131,426	119,114	393,691	369,339
Restructuring expenses	0	0	4,797	0
Loss (gain) on sale of businesses - net	0	(2,067)	0	(2,067)
Operating income	126,504	109,708	367,308	326,876
Other (income) expense - net	1,653	(1,513)	1,717	(2,496)
Interest expense	11,064	11,913	33,920	33,607
Income before income taxes	113,787	99,308	331,671	295,765
Provision for income taxes	30,019	29,435	88,160	82,003
Net income	$ 83,768	$ 69,873	$ 243,511	$ 213,762
Basic earnings per common share (in dollars per share)	$ 1.09	$ 0.92	$ 3.19	$ 2.81
Diluted earnings per common share (in dollars per share)	$ 1.08	$ 0.91	$ 3.15	$ 2.78
Share data:
Basic weighted average common shares outstanding (in shares)	76,309	75,819	76,215	75,753
Diluted weighted average common shares outstanding (in shares)	77,523	76,880	77,246	76,742