Goodwill and Other Intangible Assets - Intangible Assets (Details) (USD $) In Thousands, unless otherwise specified	Jul. 01, 2012	Dec. 31, 2011
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Net	$ 15,347	$ 6,938
Patents trademarks and other [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Gross	11,641	7,896
Finite-Lived Intangible Assets, Accumulated Amortization	(4,557)	(3,701)
Finite-Lived Intangible Assets, Net	7,084	4,195
Developed technology [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Gross	8,659	2,303
Finite-Lived Intangible Assets, Accumulated Amortization	(716)	(55)
Finite-Lived Intangible Assets, Net	7,943	2,248
Note issuance costs [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Gross	2,445	2,445
Finite-Lived Intangible Assets, Accumulated Amortization	(2,125)	(1,950)
Finite-Lived Intangible Assets, Net	$ 320	$ 495