Condensed Consolidated Statements of Income and Comprehensive Income (Unaudited) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011
Condensed Consolidated Statements of Income and Comprehensive Income [Abstract]
Net sales	$ 198,789	$ 195,507
Cost of sales	140,791	141,416
Gross profit	57,998	54,091
Selling, general and administrative expenses	40,881	41,723
Operating income	17,117	12,368
Interest expense, net	1,081	1,237
Income before income taxes	16,036	11,131
Income tax expense	6,051	4,412
Net income	9,985	6,719
Comprehensive income	$ 12,002	$ 8,529
Income per common share:
Basic	$ 0.30	$ 0.19
Diluted	$ 0.29	$ 0.19
Dividends declared per share	$ 0.08	$ 0.07