Goodwill and Other Intangible Assets - Intangible Assets (Details) (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jul. 01, 2012	Jan. 01, 2012
Finite-Lived Intangible Assets, Net [Abstract]
Finite-Lived Intangible Assets, Gross	$ 98,731	$ 99,902	[1]
Finite-Lived Intangible Assets, Accumulated Amortization	(81,308)	(76,002)	[1]
Finite-Lived Intangible Assets, Net	17,423	23,900	[1]
Finite-Lived Intangible Assets, Future Amortization Expense [Abstract]
2012 (remaining six months)	5,032
2013	5,327
2014	3,890
2015	2,978
2016	196
Finite-Lived Intangible Assets, Future Amortization Expense	17,423
Patents, trade names and purchased technology [Member]
Finite-Lived Intangible Assets, Net [Abstract]
Finite-Lived Intangible Assets, Gross	52,937	52,992	[1]
Finite-Lived Intangible Assets, Accumulated Amortization	(51,034)	(50,280)	[1]
Finite-Lived Intangible Assets, Net	1,903	2,712	[1]
Purchased In-process Research and Development [Member]
Finite-Lived Intangible Assets, Net [Abstract]
Finite-Lived Intangible Assets, Gross	1,000	1,000	[1]
Finite-Lived Intangible Assets, Accumulated Amortization	(278)	(195)	[1]
Finite-Lived Intangible Assets, Net	722	805	[1]
Customer Relationships [Member]
Finite-Lived Intangible Assets, Net [Abstract]
Finite-Lived Intangible Assets, Gross	44,794	45,910	[1]
Finite-Lived Intangible Assets, Accumulated Amortization	(29,996)	(25,527)	[1]
Finite-Lived Intangible Assets, Net	$ 14,798	$ 20,383	[1]

[1] As adjusted to reflect the balances of Tenesol beginning October 10, 2011, as required under the accounting guidelines for a transfer of an entity under common control (see Note 3).