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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. 28, 2014 | Jun. 29, 2013 | Jun. 28, 2014 | Jun. 29, 2013 | Dec. 31, 2013 | Jun. 28, 2014 Customer Relationships [Member] | Dec. 31, 2013 Customer Relationships [Member] | Jun. 28, 2014 Developed Technology [Member] | Dec. 31, 2013 Developed Technology [Member] | Jun. 28, 2014 Other Intangible Assets [Member] | Dec. 31, 2013 Other Intangible Assets [Member] | Jun. 28, 2014 Trade Names [Member] | Dec. 31, 2013 Trade Names [Member] | Jun. 28, 2014 Minimum [Member] Other Intangible Assets [Member] | Jun. 28, 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 | $ 581,144 |  | $ 581,144 |  | $ 567,478 | $ 389,362 | $ 374,244 | $ 9,877 | $ 9,625 | $ 2,905 | [1] | $ 4,609 | [1] | $ 179,000 | $ 179,000 |  |
Accumulated Amortization | (161,862) |  | (161,862) |  | (141,409) | (154,920) | (134,817) | (5,152) | (4,051) | (1,790) | [1] | (2,541) | [1] | 0 | 0 |  |
Net | 419,282 |  | 419,282 |  | 426,069 | 234,442 | 239,427 | 4,725 | 5,574 | 1,115 | [1] | 2,068 | [1] | 179,000 | 179,000 |  |
Finite-Lived Intangible Assets, Useful Life |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1 year | 3 years
Amortization of Intangible Assets | 10,870 | 8,869 | 21,817 | 17,826 |  |  |  |  |  |  |  |  |  |  |  |  |
Amortization of intangible assets, net of tax | $ 8,867 | $ 7,029 | $ 17,774 | $ 14,145 |  |  |  |  |  |  |  |  |  |  |  |  |
Amortization of intangible assets, per share basic | $ 0.09 | $ 0.07 | $ 0.18 | $ 0.14 |  |  |  |  |  |  |  |  |  |  |  |  |
Amortization of intangible assets, per share diluted | $ 0.09 | $ 0.07 | $ 0.18 | $ 0.13 |  |  |  |  |  |  |  |  |  |  |  |  |
[1] | Consists of non-competition agreements and sales backlog with useful lives ranging from one to three years.

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- Definition Weighted average amortization period of finite-lived intangible assets acquired either individually or as part of a group of assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16265-109275 + Details
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