Consolidated Statements of Income - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Income Statement [Abstract]
Revenue	$ 2,639,212	$ 2,613,154	$ 2,626,761
Cost of sales, including warehousing, distribution and occupancy	1,654,569	1,632,914	1,636,298
Gross profit	984,643	980,240	990,463
Selling, general, and administrative	567,296	554,882	533,666
Long-lived asset impairments	28,333	0	0
Other income, net	(4,093)	(14,154)	(3,701)
Operating income	393,107	439,512	460,498
Interest expense, net	50,936	46,708	53,029
Income before income taxes	342,171	392,804	407,469
Income tax expense	122,872	136,932	142,448
Net income	$ 219,299	$ 255,872	$ 265,021
Earnings per share:
Basic (in usd per share)	$ 2.61	$ 2.83	$ 2.75
Diluted (in usd per share)	$ 2.60	$ 2.81	$ 2.72
Weighted average common shares outstanding:
Basic (in shares)	83,927	90,493	96,481
Diluted (in shares)	84,186	90,918	97,383
Dividends declared per share (in USD per share)	$ 0.72	$ 0.64	$ 0.60