Goodwill and Other Intangible Assets - Amortization of Intangibles (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Apr. 01, 2012	Apr. 03, 2011
Finite-Lived Intangible Assets [Abstract]
Finite-lived intangible assets, amortization expense	$ 852	$ 387
Finite-Lived Intangible Assets, Future Amortization Expense [Abstract]
Expected amortization, remainder of 2012	2,677
Expected amortization, 2013	3,282
Expected amortization, 2014	2,779
Expected amortization, 2015	2,652
Expected amortization, 2016	2,445
Expected amortization thereafter	2,315
Total expected amortization expense	16,150
Patents trademarks and other [Member]
Finite-Lived Intangible Assets [Abstract]
Finite-lived intangible assets, useful life, minimum	2
Finite-lived intangible assets, useful life, maximum	15
Finite-lived intangible assets, amortization expense	427	299
Finite-Lived Intangible Assets, Future Amortization Expense [Abstract]
Expected amortization, remainder of 2012	1,405
Expected amortization, 2013	1,788
Expected amortization, 2014	1,431
Expected amortization, 2015	1,304
Expected amortization, 2016	1,097
Expected amortization thereafter	325
Total expected amortization expense	7,350
Developed technology [Member]
Finite-Lived Intangible Assets [Abstract]
Finite-lived intangible assets, amortization expense	338	0
Finite-Lived Intangible Assets, Future Amortization Expense [Abstract]
Expected amortization, remainder of 2012	1,010
Expected amortization, 2013	1,348
Expected amortization, 2014	1,348
Expected amortization, 2015	1,348
Expected amortization, 2016	1,348
Expected amortization thereafter	1,990
Total expected amortization expense	8,392
Note issuance costs [Member]
Finite-Lived Intangible Assets [Abstract]
Finite-lived intangible assets, useful life	7
Finite-lived intangible assets, amortization expense	87	88
Finite-Lived Intangible Assets, Future Amortization Expense [Abstract]
Expected amortization, remainder of 2012	262
Expected amortization, 2013	146
Expected amortization, 2014	0
Expected amortization, 2015	0
Expected amortization, 2016	0
Expected amortization thereafter	0
Total expected amortization expense	$ 408