Goodwill and Other Acquisition-Related Intangible Assets (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2012	Apr. 02, 2011	Dec. 31, 2011
Goodwill And Finite And Indefinite Lived Intangible Assets [Line Items]
Goodwill, Impairment Loss	$ 0
Impairment of Intangible Assets, Indefinite-lived (Excluding Goodwill)	0
Goodwill	3,376		3,376
Finite-Lived Intangible Assets, Gross	51,432		50,503
Finite-Lived Intangible Assets, Accumulated Amortization	(30,263)		(28,700)
Finite-Lived Intangible Assets, Net	21,169		21,803
Intangible Assets Finite and Indefinite Lived, Gross (Excluding Goodwill)	51,432		51,432
Intangible Assets, Net (Excluding Goodwill)	21,169		22,732
Intangible Assets Gross Including Goodwill	54,808		54,808
Intangible Assets Net Including Goodwill	24,545		26,108
Amortization of Intangible Assets	1,563	1,497
Change in Gross Goodwill and Intangible Assets	0
Transfer of indefinite-lived intangible assets to finite-lived intangible assets	929	250
In Process Research And Development Non Amortizing [Member]
Goodwill And Finite And Indefinite Lived Intangible Assets [Line Items]
Indefinite-Lived Intangible Assets, Gross (Excluding Goodwill)	0		929
Indefinite-lived Intangible Assets	0		929
Change in Gross Goodwill and Intangible Assets	(929)
Goodwill [Member]
Goodwill And Finite And Indefinite Lived Intangible Assets [Line Items]
Goodwill	3,376		3,376
Change in Gross Goodwill and Intangible Assets	0
In Process Research And Development [Member]
Goodwill And Finite And Indefinite Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Gross	1,779		850
Finite-Lived Intangible Assets, Accumulated Amortization	(328)		(270)
Finite-Lived Intangible Assets, Net	1,451		580
Change in Gross Goodwill and Intangible Assets	929
Finite-Lived Intangible Assets, Useful Life (years)	5	3
Finite-Lived Intangible Assets, Useful Life, Minimum	3
Intangible asset amortization period - maximum (in years)	5
Patents Trademarks And Other [Member]
Goodwill And Finite And Indefinite Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Gross	49,653		49,653
Finite-Lived Intangible Assets, Accumulated Amortization	(29,935)		(28,430)
Finite-Lived Intangible Assets, Net	19,718		21,223
Change in Gross Goodwill and Intangible Assets	$ 0
Finite-Lived Intangible Assets, Useful Life, Minimum	4
Intangible asset amortization period - maximum (in years)	15