Quarterly Results of Operations (Unaudited) (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Quarterly Financial Information Disclosure [Abstract]
Net sales	$ 614,822	$ 581,113	$ 561,249	$ 594,462	$ 605,997	$ 624,246	$ 642,099	$ 622,231	$ 2,351,646	$ 2,494,573	$ 2,483,666
Gross profit	269,168	251,500	234,800	271,956	266,885	281,978	292,337	283,834	1,027,424	1,125,034	1,117,895
Operating income	138,965	131,213	110,594	139,941	134,173	141,765	155,283	147,782	520,713	579,003	569,088
Net income	$ 101,068	$ 103,848	$ 70,864	$ 101,998	$ 96,850	$ 105,194	$ 113,209	$ 110,268	$ 377,778	$ 425,521	$ 410,573
Basic EPS (in dollar per share)	$ 1.33	$ 1.38	$ 0.94	$ 1.35	$ 1.28	$ 1.39	$ 1.50	$ 1.46	$ 4.98	$ 5.62	$ 5.36
Diluted EPS (in dollar per share)	$ 1.32	$ 1.37	$ 0.93	$ 1.33	$ 1.26	$ 1.37	$ 1.48	$ 1.44	$ 4.94	$ 5.56	$ 5.29
Basic weighted average shares outstanding (in shares)	75,817	75,352	75,171	75,740	75,779	75,698	75,460	75,442	75,741	75,594	76,412
Diluted weighted average shares outstanding (in shares)	76,367	75,960	75,937	76,452	76,570	76,577	76,387	76,284	76,400	76,454	77,563