CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Income Statement [Abstract]
Net sales	$ 622,888	$ 574,490	$ 1,869,572	$ 1,701,408
Cost of sales	342,655	316,560	1,025,320	935,612
Gross profit	280,233	257,930	844,252	765,796
Selling, general and administrative expenses	130,479	131,426	406,354	393,691
Restructuring expenses	4,621	0	8,251	4,797
Operating income	145,133	126,504	429,647	367,308
Other (income) expense - net	934	1,653	(3,565)	1,717
Interest expense	10,958	11,064	33,098	33,920
Income before income taxes	133,241	113,787	400,114	331,671
Provision for income taxes	26,889	30,019	87,678	88,160
Net income	$ 106,352	$ 83,768	$ 312,436	$ 243,511
Basic earnings per common share (in dollars per share)	$ 1.39	$ 1.09	$ 4.07	$ 3.19
Diluted earnings per common share (in dollars per share)	$ 1.37	$ 1.08	$ 4.02	$ 3.15
Share data:
Basic weighted average common shares outstanding (in shares)	76,562	76,309	76,507	76,215
Diluted weighted average common shares outstanding (in shares)	77,709	77,523	77,717	77,246