Consolidated Statements of Comprehensive Income (Loss) (Unaudited) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Consolidated Statements of Comprehensive Income (Loss) (Unaudited) [Abstract]
Net sales	$ 111,003	$ 112,750
Cost of sales	73,052	75,750
Gross profit	37,951	37,000
Selling, general, and administrative expenses	33,281	33,862
Business and systems integration expenses	2,658	3,170
Acquisition integration and restructuring expenses	247	1,084
Impairment of long-lived assets	36	0
Foreign exchange (gain) loss	(242)	470
Operating income (loss)	1,971	(1,586)
Other income (expense):
Interest income	26	16
Interest expense	(1,095)	(842)
Income (loss) before income taxes	902	(2,412)
Income tax benefit	(553)	(805)
Net income (loss)	1,455	(1,607)
Earnings (loss) per share:
Basic (in dollars per share)	$ 0.06	$ (0.06)
Diluted (in dollars per share)	$ 0.06	$ (0.06)
Weighted average number of common and common equivalent shares outstanding:
Basic (in shares)	26,154	25,767
Diluted (in shares)	26,224	25,767
Dividends per Class A common share (in dollars per share)	$ 0.08	$ 0.08
Net income (loss)	1,455	(1,607)
Foreign currency translation adjustments	(2,341)	2,457
Comprehensive income (loss)	$ (886)	$ 850