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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.

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