Consolidated Statements of Operations (unaudited) (USD $) In Thousands, except Share data	3 Months Ended		9 Months Ended
	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011	Sep. 30, 2010
Consolidated Statements of Operations (unaudited) [Abstract]
Net sales	$ 112,298	$ 112,562	$ 332,861	$ 342,110
Cost of sales	70,235	68,768	210,129	209,617
Gross profit	42,063	43,794	122,732	132,493
Selling, general and administrative expenses	31,240	28,675	92,270	91,619
Business and systems integration expenses	1,997	85	5,385	379
Multiemployer pension withdrawal expense		500	1,846	500
Acquisition integration and restructuring expenses	468	286	1,590	1,007
Foreign exchange loss	121	694	829	2,244
Impairment of long-lived assets				680
Operating income	8,237	13,554	20,812	36,064
Other income (expense)
Interest income	4	15	43	31
Interest expense	(1,212)	(1,642)	(3,772)	(5,401)
Income before income taxes	7,029	11,927	17,083	30,694
Income tax provision (benefit)	(1,057)	4,154	2,246	4,596
Net income	$ 8,086	$ 7,773	$ 14,837	$ 26,098
Earnings per share:
Basic	$ 0.31	$ 0.30	$ 0.57	$ 1.03
Diluted	$ 0.31	$ 0.30	$ 0.57	$ 1.01
Weighted average number of common and common equivalent shares outstanding:
Basic	25,771	25,577	25,830	25,387
Diluted	25,976	25,923	26,171	25,794
Dividends per Class A common share	$ 0.08	$ 0.04	$ 0.24	$ 0.12