Goodwill and Other Intangible Assets - Intangible Assets (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Apr. 01, 2012	Jan. 01, 2012
Finite-Lived Intangible Assets, Net [Abstract]
Finite-Lived Intangible Assets, Gross	$ 100,853	$ 99,902	[1]
Finite-Lived Intangible Assets, Accumulated Amortization	(78,947)	(76,002)	[1]
Finite-Lived Intangible Assets, Net	21,906	23,900	[1]
Finite-Lived Intangible Assets, Future Amortization Expense [Abstract]
2012 (remaining nine months)	7,916
2013	5,579
2014	4,075
2015	3,118
2016	1,218
Finite-Lived Intangible Assets, Future Amortization Expense	21,906
Patents, trade names and purchased technology [Member]
Finite-Lived Intangible Assets, Net [Abstract]
Finite-Lived Intangible Assets, Gross	53,089	52,992	[1]
Finite-Lived Intangible Assets, Accumulated Amortization	(50,692)	(50,280)	[1]
Finite-Lived Intangible Assets, Net	2,397	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	(236)	(195)	[1]
Finite-Lived Intangible Assets, Net	764	805	[1]
Customer Relationships [Member]
Finite-Lived Intangible Assets, Net [Abstract]
Finite-Lived Intangible Assets, Gross	46,764	45,910	[1]
Finite-Lived Intangible Assets, Accumulated Amortization	(28,019)	(25,527)	[1]
Finite-Lived Intangible Assets, Net	$ 18,745	$ 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).