Cost in Excess of Net Assets of Companies Acquired - Intangibles (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		9 Months Ended			9 Months Ended	12 Months Ended	9 Months Ended	12 Months Ended							9 Months Ended
	Sep. 28, 2013	Sep. 29, 2012	Sep. 28, 2013	Sep. 29, 2012	Dec. 31, 2012	Sep. 28, 2013 Customer Relationships [Member]	Dec. 31, 2012 Customer Relationships [Member]	Sep. 28, 2013 Developed Technology [Member]	Dec. 31, 2012 Developed Technology [Member]	Sep. 28, 2013 Other Intangible Assets [Member]		Dec. 31, 2012 Other Intangible Assets [Member]		Sep. 28, 2013 Trade Names [Member]	Dec. 31, 2012 Trade Names [Member]	Sep. 28, 2013 Minimum [Member] Other Intangible Assets [Member]	Sep. 28, 2013 Maximum [Member] Other Intangible Assets [Member]
Finite And Indefinite Lived Intangible Assets [Line Items]
Weighted-Average Life						11 years	11 years	5 years	5 years
Gross Carrying Amount	$ 524,068		$ 524,068		$ 518,424	$ 332,394	$ 325,509	$ 10,106	$ 11,154	$ 2,568	[1]	$ 2,761	[1]	$ 179,000	$ 179,000
Accumulated Amortization	(131,016)		(131,016)		(104,391)	(125,132)	(100,172)	(3,762)	(2,508)	(2,122)	[1]	(1,711)	[1]	0	0
Net	393,052		393,052		414,033	207,262	225,337	6,344	8,646	446	[1]	1,050	[1]	179,000	179,000
Finite-Lived Intangible Assets, Useful Life																1 year	3 years
Amortization of Intangible Assets	8,936	8,742	26,762	27,372
Amortization of intangible assets, net of tax	$ 7,074	$ 7,145	$ 21,219	$ 22,081
Amortization of intangible assets, per share basic	$ 0.07	$ 0.07	$ 0.21	$ 0.20
Amortization of intangible assets, per share diluted	$ 0.07	$ 0.07	$ 0.20	$ 0.20

[1] Consists of non-competition agreements and sales backlog with useful lives ranging from one to three years.