Quarterly Results of Operations (Unaudited) (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Quarterly Financial Information Disclosure [Abstract]
Net sales	$ 530,419	$ 530,356	$ 549,696	$ 502,572	$ 499,798	$ 503,791	$ 514,881	$ 502,198	$ 2,113,043	$ 2,020,668	$ 2,147,767
Gross profit	232,485	230,889	244,058	223,335	223,399	223,260	231,615	226,041	930,767	904,315	949,315
Operating income	81,411	108,857	112,976	102,557	98,259	121,813	109,909	101,757	405,801	431,738	431,224
Net income	$ 57,347	$ 69,873	$ 75,759	$ 68,130	$ 67,763	$ 79,505	$ 69,585	$ 65,954	$ 271,109	$ 282,807	$ 279,386
Basic EPS (in dollar per share)	$ 0.75	$ 0.92	$ 1.00	$ 0.90	$ 0.89	$ 1.03	$ 0.89	$ 0.84	$ 3.57	$ 3.65	$ 3.48
Diluted EPS (in dollar per share)	$ 0.75	$ 0.91	$ 0.99	$ 0.89	$ 0.88	$ 1.02	$ 0.89	$ 0.84	$ 3.53	$ 3.62	$ 3.45
Basic weighted average shares outstanding (in shares)	75,955	75,819	75,690	75,749	76,211	76,831	77,466	77,996	75,803	77,126	79,715
Diluted weighted average shares outstanding (in shares)	76,806	76,880	76,674	76,699	77,091	77,646	78,297	78,856	76,758	77,972	80,728