Goodwill and Other Intangible Assets - Intangible Assets (Details) (USD $) In Thousands, unless otherwise specified	Apr. 01, 2012	Dec. 31, 2011
Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible assets, net	$ 16,150	$ 6,938
Patents trademarks and other [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible assets, gross	11,454	7,896
Finite-lived intangible assets, accumulated amortization	(4,104)	(3,701)
Finite-lived intangible assets, net	7,350	4,195
Developed technology [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible assets, gross	8,785	2,303
Finite-lived intangible assets, accumulated amortization	(393)	(55)
Finite-lived intangible assets, net	8,392	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	(2,037)	(1,950)
Finite-lived intangible assets, net	$ 408	$ 495