Quarterly Financial Information (Unaudited) (Details) (USD $)	3 Months Ended								12 Months Ended
	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Quarterly Financial Information (Unaudited)
Net sales	$ 289,017,000	$ 302,225,000	$ 280,606,000	$ 245,136,000	$ 243,817,000	$ 242,468,000	$ 225,577,000	$ 204,214,000	$ 1,116,984,000	$ 916,076,000	$ 743,183,000
Gross profit	247,519,000	269,290,000	245,175,000	213,833,000	202,766,000	212,949,000	192,199,000	178,912,000	975,817,000	786,826,000	652,190,000
Net (loss) income	(30,314,000)	62,685,000	79,864,000	62,325,000	83,255,000	78,111,000	72,316,000	70,760,000	174,560,000	304,442,000	217,868,000
Net (loss) income per share-basic (in dollars per share)	$ (0.60)	$ 1.25	$ 1.60	$ 1.24	$ 1.65	$ 1.52	$ 1.37	$ 1.32	$ 3.49	$ 5.84	$ 3.81
Net (loss) income per share-diluted (in dollars per share)	$ (0.60)	$ 1.17	$ 1.52	$ 1.24	$ 1.60	$ 1.46	$ 1.34	$ 1.29	$ 3.28	$ 5.71	$ 3.67
Share-based compensation expense charged to operating expenses, net of tax	$ 111,200,000