Consolidated Statements of Income (Unaudited) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Income Statement [Abstract]
Net sales	$ 370,362	$ 361,954
Cost of sales	265,601	257,391
Gross profit	104,761	104,563
Selling and administrative expenses	97,829	98,542
Operating income	6,932	6,021
Interest expense, net	1,614	1,477
Income before income taxes and equity earnings	5,318	4,544
Provision for income taxes	1,896	1,037
Equity earnings in unconsolidated investments	18	144
Net income	$ 3,440	$ 3,651
Earnings per share:
Basic (in dollars per share)	$ 0.07	$ 0.08
Diluted (in dollars per share)	$ 0.07	$ 0.08
Weighted average shares outstanding: [Abstract]
Basic (in shares)	46,385	47,519
Diluted (in shares)	47,580	48,598
Cash dividends declared per common share	$ 0.16	$ 0.14