Condensed Consolidated Statements of Income (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Income Statement [Abstract]
Net sales	$ 204,024	$ 181,101	$ 419,004	$ 379,890
Cost of sales	148,255	133,737	304,917	274,528
Gross profit	55,769	47,364	114,087	105,362
Selling, general and administrative expenses	42,650	37,372	87,724	78,253
Operating income	13,119	9,992	26,363	27,109
Interest expense, net	1,116	1,054	2,208	2,135
Income before income taxes	12,003	8,938	24,155	24,974
Income tax expense	3,691	3,280	7,960	9,331
Net income	$ 8,312	$ 5,658	$ 16,195	$ 15,643
Income per common share:
Basic (in dollars per share)	$ 0.25	$ 0.17	$ 0.48	$ 0.47
Diluted (in dollars per share)	$ 0.25	$ 0.17	$ 0.48	$ 0.46
Dividends declared per share (in dollars per share)	$ 0.09	$ 0.08	$ 0.18	$ 0.16