CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Income Statement [Abstract]
Net sales	$ 543,996	$ 494,448
Cost of sales	299,576	282,451
Gross profit	244,420	211,997
Selling, general and administrative expenses	130,585	117,285
Operating income	113,835	94,712
Other income — net	844	1,279
Interest expense	10,457	10,557
Income before income taxes	104,222	85,434
Provision for income taxes	29,674	24,134
Net income	$ 74,548	$ 61,300
Basic earnings per common share (in dollars per share)	$ 0.92	$ 0.74
Diluted earnings per common share (in dollars per share)	$ 0.91	$ 0.74
Share data:
Basic weighted average common shares outstanding (in shares)	80,527	82,197
Diluted weighted average common shares outstanding (in shares)	81,575	83,152