Condensed Consolidated Statements of Income (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Income Statement [Abstract]
Net sales	$ 194,920	$ 197,290	$ 613,924	$ 577,180
Cost of sales	141,281	144,561	446,198	419,089
Gross profit	53,639	52,729	167,726	158,091
Selling, general and administrative expenses	41,564	42,957	129,288	121,210
Operating income	12,075	9,772	38,438	36,881
Interest expense, net	1,112	1,194	3,320	3,328
Income before income taxes	10,963	8,578	35,118	33,553
Income tax expense	4,475	2,782	12,435	12,112
Net income	$ 6,488	$ 5,796	$ 22,683	$ 21,441
Income per common share:
Basic (in dollars per share)	$ 0.19	$ 0.17	$ 0.68	$ 0.64
Diluted (in dollars per share)	$ 0.19	$ 0.17	$ 0.67	$ 0.63
Dividends declared per share (in dollars per share)	$ 0.09	$ 0.08	$ 0.27	$ 0.24