Consolidated Statements of Comprehensive Income (Unaudited) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Consolidated Statements of Comprehensive Income (Unaudited) [Abstract]
Net sales	$ 110,838	$ 112,298	$ 339,850	$ 332,861
Cost of sales	71,599	70,344	223,716	210,577
Gross profit	39,239	41,954	116,134	122,284
Selling, general, and administrative expenses	32,454	31,131	100,415	91,822
Business and systems integration expenses	2,997	1,997	10,459	5,385
Acquisition integration and restructuring expenses	1,218	468	4,774	1,590
Impairment of long-lived assets	4,281	0	4,281	0
Foreign exchange loss (gain)	(12)	121	548	829
Multiemployer pension withdrawal expense (income)	(203)	0	(203)	1,846
Operating income (loss)	(1,496)	8,237	(4,140)	20,812
Other income (expense):
Interest income	57	4	82	43
Interest expense	(917)	(1,212)	(2,676)	(3,772)
Income (loss) before income taxes	(2,356)	7,029	(6,734)	17,083
Income tax provision (benefit)	(143)	(1,057)	(1,418)	2,246
Net income (loss)	(2,213)	8,086	(5,316)	14,837
Earnings (loss) per share:
Basic (in dollars per share)	$ (0.09)	$ 0.31	$ (0.21)	$ 0.57
Diluted (in dollars per share)	$ (0.09)	$ 0.31	$ (0.21)	$ 0.57
Weighted average number of common and common equivalent shares outstanding:
Basic (in shares)	25,980	25,771	25,876	25,830
Diluted (in shares)	25,980	25,976	25,876	26,171
Dividends per Class A common share (in dollars per share)	$ 0.08	$ 0.08	$ 0.24	$ 0.24
Comprehensive income (loss)	$ 577	$ 4,292	$ (3,466)	$ 14,276