CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Income Statement [Abstract]
Net sales	$ 546,693	$ 518,445	$ 1,090,689	$ 1,012,893
Cost of sales	305,561	295,596	605,137	578,047
Gross profit	241,132	222,849	485,552	434,846
Selling, general and administrative expenses	129,044	123,290	259,629	240,575
Operating income	112,088	99,559	225,923	194,271
Other income (expense) — net	(137)	(573)	707	706
Interest expense	10,405	10,597	20,862	21,154
Income before income taxes	101,546	88,389	205,768	173,823
Provision for income taxes	29,769	25,828	59,443	49,962
Net income	$ 71,777	$ 62,561	$ 146,325	$ 123,861
Basic earnings per common share (in dollars per share)	$ 0.89	$ 0.76	$ 1.81	$ 1.50
Diluted earnings per common share (in dollars per share)	$ 0.88	$ 0.76	$ 1.79	$ 1.49
Share data:
Basic weighted average common shares outstanding (in shares)	80,106	81,829	80,317	82,013
Diluted weighted average common shares outstanding (in shares)	81,149	82,734	81,362	82,943