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Intangibles (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jul. 01, 2017 | Jul. 02, 2016 | Jul. 01, 2017 | Jul. 02, 2016 | Dec. 31, 2016
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |
Finite-Lived Intangible Assets, Amortization Expense, Next Twelve Months | $ 33,436 |  | $ 33,436 |  |
Amortization of Intangible Assets | 10,500 | $ 9,400 | 17,300 | $ 18,000 |
Finite-Lived Intangible Assets, Gross | 339,007 |  | 339,007 |  | $ 289,449
Finite-Lived Intangible Assets, Accumulated Amortization | (186,606) |  | (186,606) |  | (168,369)
Finite-Lived Intangible Assets, Amortization Expense, Year Two | 28,033 |  | 28,033 |  |
Finite-Lived Intangible Assets, Amortization Expense, Year Three | 23,873 |  | 23,873 |  |
Finite-Lived Intangible Assets, Amortization Expense, Year Four | 21,282 |  | 21,282 |  |
Finite-Lived Intangible Assets, Amortization Expense, Year Five | 18,572 |  | 18,572 |  |
Finite-Lived Intangible Assets, Amortization Expense, after Year Five | 27,205 |  | $ 27,205 |  |
Finite-Lived Intangible Assets, Net |  |  |  |  | 152,401
Customer Lists [Member] |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |
Finite-Lived Intangible Asset, Useful Life |  |  | 7 years 3 months | 5 years 6 months |
Finite-Lived Intangible Assets, Gross | 301,082 |  | $ 301,082 |  | 251,025
Finite-Lived Intangible Assets, Accumulated Amortization | (153,598) |  | $ (153,598) |  | (136,895)
Backlog [Member] |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |
Finite-Lived Intangible Asset, Useful Life |  |  | 3 months | 0 months |
Finite-Lived Intangible Assets, Gross | 16,285 |  | $ 16,285 |  | 13,550
Finite-Lived Intangible Assets, Accumulated Amortization | (15,276) |  | $ (15,276) |  | (13,550)
Developed Technology Rights [Member] |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |
Finite-Lived Intangible Asset, Useful Life |  |  | 4 years 1 month | 4 years 9 months |
Finite-Lived Intangible Assets, Gross | 21,640 |  | $ 21,640 |  | 24,874
Finite-Lived Intangible Assets, Accumulated Amortization | (17,732) |  | (17,732) |  | (17,924)
Tradenames And Trademarks [Member] |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |
Indefinite-Lived Intangible Assets (Excluding Goodwill) | $ 622,575 |  | $ 622,575 |  | $ 575,091

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- Definition The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6388964&loc=d3e16225-109274 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details
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