Condensed Consolidated Statements of Income and Comprehensive Income (Unaudited) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Condensed Consolidated Statements of Income and Comprehensive Income [Abstract]
Net sales	$ 3,337,836	$ 3,184,984	$ 6,519,124	$ 6,159,182
Cost of goods sold	2,365,550	2,268,870	4,627,727	4,394,274
Gross profit	972,286	916,114	1,891,397	1,764,908
Operating expenses:
Selling, administrative & other expenses	680,246	651,635	1,348,204	1,285,904
Depreciation and amortization	24,735	22,928	47,720	45,473
Total operating expenses	704,981	674,563	1,395,924	1,331,377
Income before income taxes	267,305	241,551	495,473	433,531
Income taxes	98,687	89,739	180,600	155,204
Net income	168,618	151,812	314,873	278,327
Basic net income per common share	$ 1.08	$ 0.97	$ 2.02	$ 1.77
Diluted net income per common share	$ 1.08	$ 0.96	$ 2.01	$ 1.76
Dividends declared per common share	$ 0.495	$ 0.45	$ 0.99	$ 0.90
Weighted average common shares outstanding	155,753	157,248	155,781	157,439
Dilutive effect of stock options and non-vested restricted stock awards	1,019	995	1,073	988
Weighted average common shares outstanding - assuming dilution	156,772	158,243	156,854	158,427
Comprehensive income	$ 163,693	$ 163,361	$ 338,467	$ 318,199