CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Income Statement [Abstract]
Net sales	$ 2,483,666	$ 2,287,312	$ 2,113,043
Cost of sales	1,365,771	1,260,634	1,182,276
Gross profit	1,117,895	1,026,678	930,767
Selling, general and administrative expenses	536,724	524,940	492,398
Loss (gain) on sale of businesses - net	0	(9,273)	22,298
Restructuring expenses	12,083	8,455	3,674
Operating income	569,088	502,556	412,397
Other (income) expense - net	(3,985)	2,394	(1,731)
Interest expense	44,134	44,889	45,616
Income before income taxes	528,939	455,273	368,512
Provision for income taxes	118,366	118,016	97,403
Net income	$ 410,573	$ 337,257	$ 271,109
Earnings per common share:
Basic earnings per common share (in dollar per share)	$ 5.36	$ 4.41	$ 3.57
Diluted earnings per common share (in dollar per share)	$ 5.29	$ 4.36	$ 3.53
Share data:
Basic weighted average common shares outstanding (in shares)	76,412	76,232	75,803
Diluted weighted average common shares outstanding (in shares)	77,563	77,333	76,758