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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 | 6 Months Ended |  | 6 Months Ended | 12 Months Ended | 6 Months Ended | 12 Months Ended |  |  |  |  | 6 Months Ended
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Jun. 29, 2013 | Jun. 30, 2012 | Jun. 29, 2013 | Jun. 30, 2012 | Dec. 31, 2012 | Jun. 29, 2013 Customer Relationships [Member] | Dec. 31, 2012 Customer Relationships [Member] | Jun. 29, 2013 Developed Technology [Member] | Dec. 31, 2012 Developed Technology [Member] | Jun. 29, 2013 Other Intangible Assets [Member] | Dec. 31, 2012 Other Intangible Assets [Member] | Jun. 29, 2013 Trade Names [Member] | Dec. 31, 2012 Trade Names [Member] | Jun. 29, 2013 Minimum [Member] Other Intangible Assets [Member] | Jun. 29, 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 | $ 515,850 |  | $ 515,850 |  | $ 518,424 | $ 324,270 | $ 325,509 | $ 10,037 | $ 11,154 | $ 2,543 | [1] | $ 2,761 | [1] | $ 179,000 | $ 179,000 |  |
Accumulated Amortization | (120,680) |  | (120,680) |  | (104,391) | (115,528) | (100,172) | (3,233) | (2,508) | (1,919) | [1] | (1,711) | [1] | 0 | 0 |  |
Net | 395,170 |  | 395,170 |  | 414,033 | 208,742 | 225,337 | 6,804 | 8,646 | 624 | [1] | 1,050 | [1] | 179,000 | 179,000 |  |
Finite-Lived Intangible Assets, Useful Life |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1 year | 3 years
Amortization of Intangible Assets | 8,869 | 8,959 | 17,826 | 18,630 |  |  |  |  |  |  |  |  |  |  |  |  |
Amortization of intangible assets, net of tax | $ 7,029 | $ 7,360 | $ 14,145 | $ 14,936 |  |  |  |  |  |  |  |  |  |  |  |  |
Amortization of intangible assets, per share basic | $ 0.07 | $ 0.07 | $ 0.14 | $ 0.13 |  |  |  |  |  |  |  |  |  |  |  |  |
Amortization of intangible assets, per share diluted | $ 0.07 | $ 0.07 | $ 0.13 | $ 0.13 |  |  |  |  |  |  |  |  |  |  |  |  |
[1] | Consists of non-competition agreements and sales backlog with useful lives ranging from one to three years.

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