Quarterly Financial Data (Unaudited) (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Quarterly Financial Information Disclosure [Abstract]
Net sales	$ 130,967	$ 138,858	$ 139,723	$ 133,384	$ 133,721	$ 135,042	$ 138,324	$ 139,805	$ 542,932	$ 546,892	$ 538,740
Costs and expenses:
Cost of products sold	78,207	83,364	84,372	81,218	84,629	81,656	85,674	85,298	327,161	337,256	345,171
Selling	17,641	18,195	18,988	18,178	18,252	17,779	18,095	19,221	73,002	73,348	78,197
General and administrative	13,202	14,133	14,407	14,797	14,796	15,278	15,506	14,634	56,539	60,214	63,701
Research and development	2,004	1,909	2,044	1,946	1,970	1,845	2,089	1,954	7,903	7,858	9,567
Restructuring	2,430	3,466	7,595	4,651	6,390	3,034	4,165	1,255	18,142	14,844	25,708
Total operating costs and expenses	113,484	121,067	127,406	120,790	126,037	119,592	125,529	122,362	482,747	493,520	522,344
Income from operations	17,483	17,791	12,317	12,594	7,684	15,450	12,795	17,443	60,185	53,372	16,396
Interest expense, net	(9,782)	(9,412)	(8,917)	(8,657)	(8,983)	(9,378)	(13,112)	(9,206)	(36,768)	(40,681)	(37,878)
(Loss) gain on debt extinguishment	0	0	0	0	0	0	(3,123)	0	0	(3,123)	243
Foreign exchange loss	98	367	(307)	(877)	50	(905)	50	(249)	(719)	(1,052)	(358)
Income (loss) before (provision) benefit for income taxes	7,799	8,746	3,093	3,060	(1,249)	5,167	(3,390)	7,988	22,698	8,516	(21,597)
(Provision) benefit for income taxes	3,360	(29,218)	(2,329)	(1,893)	4,692	(3,063)	(3,489)	(2,503)	(30,080)	(4,363)	3,562
Net (loss) income	11,159	(20,472)	764	1,167	3,443	2,104	(6,879)	5,485	(7,382)	4,153	(18,035)
Comprehensive (loss) income	$ (23,785)	$ (41,003)	$ 2,278	$ (758)	$ 13,330	$ 9,182	$ (9,245)	$ 2,727	$ (63,268)	$ 15,994	$ (28,382)
Net (loss) income per common share—basic (in dollars per share)	$ 0.71	$ (1.32)	$ 0.05	$ 0.08	$ 0.22	$ 0.14	$ (0.45)	$ 0.36	$ (0.48)	$ 0.27	$ (1.18)
Net (loss) income per common share—diluted (in dollars per share)	$ 0.71	$ (1.32)	$ 0.05	$ 0.07	$ 0.21	$ 0.13	$ (0.45)	$ 0.36	$ (0.48)	$ 0.26	$ (1.18)