Quarterly Financial Information (Unaudited) (Details) (USD $)	3 Months Ended								12 Months Ended
	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Quarterly Financial Information (Unaudited)
Net sales	$ 346,363,000	$ 329,950,000	$ 322,802,000	$ 289,403,000	$ 289,017,000	$ 302,225,000	$ 280,606,000	$ 245,136,000	$ 1,288,519,000	$ 1,116,984,000	$ 916,076,000
Gross profit	329,611,000	287,466,000	282,620,000	253,953,000	247,519,000	269,290,000	245,175,000	213,833,000	1,153,650,000	975,817,000	786,826,000
Net (loss ) income	115,935,000	(25,237,000)	111,852,000	137,524,000	(30,314,000)	62,685,000	79,864,000	62,325,000	340,074,000	174,560,000	304,442,000
Net (loss) income per share-basic (in dollars per share)	$ 2.44	$ (0.53)	$ 2.35	$ 2.73	$ (0.60)	$ 1.25	$ 1.60	$ 1.24	$ 7.06	$ 3.49	$ 5.84
Net (loss) income per share-diluted (in dollars per share)	$ 2.17	$ (0.53)	$ 2.10	$ 2.43	$ (0.60)	$ 1.17	$ 1.52	$ 1.19	$ 6.28	$ 3.28	$ 5.71
Share-based compensation expense charged to operating expenses, net of tax		$ 140,300,000			$ 111,200,000