Other Intangible Assets (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 29, 2012	Oct. 01, 2011	Sep. 29, 2012	Oct. 01, 2011	Dec. 31, 2011
Finite-Lived Intangible Assets [Line Items]
Intangible Assets Subject to Amortization	$ 307,085		$ 307,085		$ 260,634
Accumulated amortization	(190,718)		(190,718)		(177,066)
Net Intangible Assets Subject to Amortization	116,367		116,367		83,568
Intangible assets, net	136,726		136,726		103,927
Amortization expense (excluding capitalized software)	3,700	3,787	10,989	11,352
Finite Lived Intangible Assets Future Amortization Expense [Abstract]
2012	14,861		14,861
2013	15,342		15,342
2014	15,222		15,222
2015	15,154		15,154
2016	13,479		13,479
HiRel Systems [Member]
Finite-Lived Intangible Assets [Line Items]
Amortization expense (excluding capitalized software)	694		1,975
Portion of HiRel purchase price allocated to intangible assets	43,950		43,950
Patents and Acquired Technology [Member]
Finite-Lived Intangible Assets [Line Items]
Intangible Assets Subject to Amortization	115,154		115,154		111,428
Accumulated amortization	(92,094)		(92,094)		(89,379)
Capitalized Software [Member]
Finite-Lived Intangible Assets [Line Items]
Intangible Assets Subject to Amortization	55,873		55,873		53,721
Accumulated amortization	(50,495)		(50,495)		(47,836)
Customer Relationships [Member]
Finite-Lived Intangible Assets [Line Items]
Intangible Assets Subject to Amortization	97,451		97,451		57,723
Accumulated amortization	(31,539)		(31,539)		(26,174)
Tradenames [Member]
Finite-Lived Intangible Assets [Line Items]
Intangible Assets Subject to Amortization	36,907		36,907		36,762
Accumulated amortization	(16,240)		(16,240)		(13,615)
Intangible Assets Not Subject to Amortization (Indefinite-lived)	20,359		20,359		20,359
Non-competition Agreements [Member]
Finite-Lived Intangible Assets [Line Items]
Intangible Assets Subject to Amortization	1,700		1,700		1,000
Accumulated amortization	$ (350)		$ (350)		$ (62)