Consolidated Statements Of Operations (Unaudited) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 28, 2015	Jun. 29, 2014	Jun. 28, 2015	Jun. 29, 2014
Income Statement [Abstract]
Net revenues	$ 147,550	$ 170,925	$ 276,092	$ 318,331
Cost of revenues	86,053	98,418	158,058	183,538
Gross profit	61,497	72,507	118,034	134,793
Selling, general, and administrative expenses	51,891	55,369	103,197	109,715
Research and development	4,921	3,810	9,464	7,692
Restructuring expense	284	341	1,588	2,233
Litigation settlement	8,980	0	8,980	0
Acquisition costs	41	0	120	0
Other operating income	(132)	0	(493)	0
Operating (loss) income	(4,488)	12,987	(4,822)	15,153
Interest income	232	285	459	552
Interest expense	990	1,199	1,928	2,455
Other gain (loss), net	(859)	(442)	(488)	(528)
(Loss) earnings before income taxes	(6,105)	11,631	(6,779)	12,722
Income tax expense	3,387	1,777	5,272	2,997
Net (loss) earnings	$ (9,492)	$ 9,854	$ (12,051)	$ 9,725
Net (loss) earnings per common share:
Basic (loss) earnings per share (USD per share)	$ (0.22)	$ 0.23	$ (0.28)	$ 0.23
Diluted (loss) earnings per share (USD per share)	(0.22)	0.23	(0.28)	0.23
Dividends declared per share (USD per share)	$ 0	$ 0	$ 0.50	$ 0