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Goodwill - Intangibles (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Oct. 01, 2016 | Sep. 26, 2015 | Oct. 01, 2016 | Sep. 26, 2015 | Dec. 31, 2015
Finite And Indefinite Lived Intangible Assets [Line Items] |  |  |  |  |  |  |  |
Gross Carrying Amount | $ 609,728 |  |  | $ 609,728 |  |  | $ 613,390 |
Accumulated Amortization | (253,760) |  |  | (253,760) |  |  | (224,064) |
Net | 355,968 |  |  | 355,968 |  |  | $ 389,326 |
Amortization of Intangible Assets | 13,893 |  | $ 14,269 | $ 41,252 |  | $ 39,293 |  |
Customer Relationships [Member] |  |  |  |  |  |  |  |
Finite And Indefinite Lived Intangible Assets [Line Items] |  |  |  |  |  |  |  |
Weighted-Average Life |  |  |  | 10 years |  |  | 10 years |
Gross Carrying Amount | 485,493 |  |  | $ 485,493 |  |  | $ 498,319 |
Accumulated Amortization | (238,987) |  |  | (238,987) |  |  | (215,263) |
Net | 246,506 |  |  | $ 246,506 |  |  | $ 283,056 |
Developed Technology [Member] |  |  |  |  |  |  |  |
Finite And Indefinite Lived Intangible Assets [Line Items] |  |  |  |  |  |  |  |
Weighted-Average Life |  |  |  | 5 years |  |  | 5 years |
Gross Carrying Amount | 16,220 |  |  | $ 16,220 |  |  | $ 13,154 |
Accumulated Amortization | (10,993) |  |  | (10,993) |  |  | (7,894) |
Net | 5,227 |  |  | 5,227 |  |  | 5,260 |
Other Intangible Assets [Member] |  |  |  |  |  |  |  |
Finite And Indefinite Lived Intangible Assets [Line Items] |  |  |  |  |  |  |  |
Gross Carrying Amount | 7,015 | [1] |  | 7,015 | [1] |  | 917 | [2]
Accumulated Amortization | (3,780) | [1] |  | (3,780) | [1] |  | (907) | [2]
Net | 3,235 | [1] |  | 3,235 | [1] |  | 10 | [2]
Trade Names [Member] |  |  |  |  |  |  |  |
Finite And Indefinite Lived Intangible Assets [Line Items] |  |  |  |  |  |  |  |
Gross Carrying Amount | 101,000 |  |  | 101,000 |  |  | 101,000 |
Accumulated Amortization | 0 |  |  | 0 |  |  | 0 |
Net | $ 101,000 |  |  | $ 101,000 |  |  | $ 101,000 |
Minimum [Member] | Other Intangible Assets [Member] |  |  |  |  |  |  |  |
Finite And Indefinite Lived Intangible Assets [Line Items] |  |  |  |  |  |  |  |
Finite-Lived Intangible Assets, Useful Life |  |  |  | 2 years |  |  | 2 years |
Maximum [Member] | Other Intangible Assets [Member] |  |  |  |  |  |  |  |
Finite And Indefinite Lived Intangible Assets [Line Items] |  |  |  |  |  |  |  |
Finite-Lived Intangible Assets, Useful Life |  |  |  | 5 years |  |  | 3 years |
[1] | Consists of non-competition agreements, sales backlog, and an amortizable trade name with useful lives ranging from two to five years.
[2] | Consists of non-competition agreements with useful lives ranging from two 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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