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. 27, 2014	Sep. 28, 2013	Sep. 27, 2014	Sep. 28, 2013	Dec. 31, 2013	Sep. 27, 2014 Customer Relationships [Member]	Dec. 31, 2013 Customer Relationships [Member]	Sep. 27, 2014 Developed Technology [Member]	Dec. 31, 2013 Developed Technology [Member]	Sep. 27, 2014 Other Intangible Assets [Member]		Dec. 31, 2013 Other Intangible Assets [Member]		Sep. 27, 2014 Trade Names [Member]	Dec. 31, 2013 Trade Names [Member]	Sep. 27, 2014 Minimum [Member] Other Intangible Assets [Member]	Sep. 27, 2014 Maximum [Member] Other Intangible Assets [Member]
Finite And Indefinite Lived Intangible Assets [Line Items]
Weighted-Average Life						10 years	10 years	5 years	5 years
Gross Carrying Amount	$ 591,623		$ 591,623		$ 567,478	$ 400,554	$ 374,244	$ 9,366	$ 9,625	$ 2,703	[1]	$ 4,609	[1]	$ 179,000	$ 179,000
Accumulated Amortization	(169,913)		(169,913)		(141,409)	(162,517)	(134,817)	(5,339)	(4,051)	(2,057)	[1]	(2,541)	[1]	0	0
Net	421,710		421,710		426,069	238,037	239,427	4,027	5,574	646	[1]	2,068	[1]	179,000	179,000
Finite-Lived Intangible Assets, Useful Life																1 year	3 years
Amortization of Intangible Assets	11,108	8,936	32,925	26,762
Amortization of intangible assets, net of tax	$ 9,086	$ 7,074	$ 26,860	$ 21,219
Amortization of intangible assets, per share basic	$ 0.09	$ 0.07	$ 0.27	$ 0.21
Amortization of intangible assets, per share diluted	$ 0.09	$ 0.07	$ 0.27	$ 0.20

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