CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Income Statement [Abstract]
Net sales	$ 533,179	$ 490,617	$ 1,623,868	$ 1,503,510
Cost of sales	298,533	279,108	903,670	857,155
Gross profit	234,646	211,509	720,198	646,355
Selling, general and administrative expenses	123,799	114,140	383,428	354,715
Operating income	110,847	97,369	336,770	291,640
Other (income) expense — net	(944)	188	(1,651)	(518)
Interest expense	10,461	10,570	31,323	31,724
Income before income taxes	101,330	86,611	307,098	260,434
Provision for income taxes	29,889	22,812	89,332	72,774
Net income	$ 71,441	$ 63,799	$ 217,766	$ 187,660
Basic earnings per common share (in dollars per share)	$ 0.89	$ 0.78	$ 2.70	$ 2.28
Diluted earnings per common share (in dollars per share)	$ 0.88	$ 0.78	$ 2.68	$ 2.27
Share data:
Basic weighted average common shares outstanding (in shares)	79,558	81,259	80,064	81,762
Diluted weighted average common shares outstanding (in shares)	80,561	82,218	81,093	82,701