Consolidated Statements of Comprehensive Income (unaudited) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011
Consolidated Statements of Comprehensive Income (unaudited) [Abstract]
Net sales	$ 112,750	$ 107,234
Cost of sales	75,684	68,482
Gross profit	37,066	38,752
Selling, general, and administrative expenses	33,928	31,032
Business and systems integration expenses	3,170	1,239
Acquisition integration and restructuring expenses	1,084	431
Foreign exchange loss	470	501
Operating income (loss)	(1,586)	5,549
Other income (expense):
Interest income	16	18
Interest expense	(842)	(1,287)
Income (loss) before income taxes	(2,412)	4,280
Income tax provision (benefit)	(805)	1,491
Net income (loss)	(1,607)	2,789
Earnings (loss) per share:
Basic (in dollars per share)	$ (0.06)	$ 0.11
Diluted (in dollars per share)	$ (0.06)	$ 0.11
Weighted average number of common and common equivalent shares outstanding:
Basic (in shares)	25,767	25,817
Diluted (in shares)	25,767	26,246
Dividends per Class A common share (in dollars per share)	$ 0.08	$ 0.08
Comprehensive income	$ 850	$ 5,463