Consolidated Statements of Income (Unaudited) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Income Statement [Abstract]
Net sales	$ 406,344	$ 370,362
Cost of sales	292,244	265,601
Gross profit	114,100	104,761
Selling and administrative expenses	105,454	97,829
Operating income	8,646	6,932
Interest expense, net	1,933	1,614
Income before income taxes and equity earnings	6,713	5,318
Provision for income taxes	2,604	1,896
Equity earnings in unconsolidated investments	79	18
Net income	$ 4,188	$ 3,440
Earnings per share:
Basic (in dollars per share)	$ 0.09	$ 0.07
Diluted (in dollars per share)	$ 0.09	$ 0.07
Weighted average shares outstanding: [Abstract]
Basic (in shares)	45,178	46,385
Diluted (in shares)	46,375	47,580
Cash dividends declared per common share	$ 0.19	$ 0.16