CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Income Statement [Abstract]
Net sales	$ 642,099	$ 634,360	$ 1,264,330	$ 1,246,684
Cost of sales	349,762	346,993	688,159	682,665
Gross profit	292,337	287,367	576,171	564,019
Selling, general and administrative expenses	134,928	137,548	270,980	275,875
Restructuring expenses	2,126	1,988	2,126	3,630
Operating income	155,283	147,831	303,065	284,514
Other (income) expense - net	(378)	(50)	(518)	(4,499)
Interest expense	11,011	11,140	21,932	22,140
Income before income taxes	144,650	136,741	281,651	266,873
Provision for income taxes	31,441	29,615	58,174	60,789
Net income	$ 113,209	$ 107,126	$ 223,477	$ 206,084
Basic earnings per common share (in dollars per share)	$ 1.50	$ 1.40	$ 2.96	$ 2.69
Diluted earnings per common share (in dollars per share)	$ 1.48	$ 1.38	$ 2.92	$ 2.65
Share data:
Basic weighted average common shares outstanding (in shares)	75,460	76,539	75,450	76,479
Diluted weighted average common shares outstanding (in shares)	76,387	77,704	76,334	77,722