Condensed Consolidated Statements of Income (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Net sales	$ 214,980	$ 198,789
Cost of sales	156,662	140,791
Gross profit	58,318	57,998
Selling, general and administrative expenses	45,074	40,881
Operating income	13,244	17,117
Interest expense, net	1,092	1,081
Income before income taxes	12,152	16,036
Income tax expense	4,269	6,051
Net income	$ 7,883	$ 9,985
Income per common share:
Basic (in dollars per share)	$ 0.24	$ 0.30
Diluted (in dollars per share)	$ 0.23	$ 0.29
Dividends declared per share (in dollars per share)	$ 0.09	$ 0.08