CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Income Statement [Abstract]
Net sales	$ 561,249	$ 642,099	$ 1,155,711	$ 1,264,330
Cost of sales	326,449	349,762	648,955	688,159
Gross profit	234,800	292,337	506,756	576,171
Selling, general and administrative expenses	120,365	134,928	252,380	270,980
Restructuring expenses	3,841	2,126	3,841	2,126
Operating income	110,594	155,283	250,535	303,065
Other (income) expense - net	6,460	(378)	8,025	(518)
Interest expense	12,439	11,011	23,316	21,932
Income before income taxes	91,695	144,650	219,194	281,651
Provision for income taxes	20,831	31,441	46,332	58,174
Net income	$ 70,864	$ 113,209	$ 172,862	$ 223,477
Basic earnings per common share (in dollars per share)	$ 0.94	$ 1.50	$ 2.29	$ 2.96
Diluted earnings per common share (in dollars per share)	$ 0.93	$ 1.48	$ 2.27	$ 2.92
Share data:
Basic weighted average common shares outstanding (in shares)	75,171	75,460	75,459	75,450
Diluted weighted average common shares outstanding (in shares)	75,937	76,387	76,198	76,334