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Intangibles (Details) - USD ($) $ in Thousands | 3 Months Ended |
--- | --- | ---
Apr. 01, 2017 | Apr. 02, 2016 | Dec. 31, 2016
Finite-Lived Intangible Assets [Line Items] |  |  |
Finite-Lived Intangible Assets, Amortization Expense, Next Twelve Months | $ 27,352 |  |
Amortization of Intangible Assets | 6,800 | $ 8,600 |
Finite-Lived Intangible Assets, Gross | 289,449 |  | $ 289,449
Finite-Lived Intangible Assets, Accumulated Amortization | (175,415) |  | (168,369)
Finite-Lived Intangible Assets, Amortization Expense, Year Two | 24,558 |  |
Finite-Lived Intangible Assets, Amortization Expense, Year Three | 18,427 |  |
Finite-Lived Intangible Assets, Amortization Expense, Year Four | 16,732 |  |
Finite-Lived Intangible Assets, Amortization Expense, Year Five | 13,714 |  |
Finite-Lived Intangible Assets, Amortization Expense, after Year Five | $ 13,251 |  |
Finite-Lived Intangible Assets, Net |  |  | 114,034
Customer Lists [Member] |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Finite-Lived Intangible Asset, Useful Life | 5 years 5 months | 5 years 6 months |
Finite-Lived Intangible Assets, Gross | $ 251,025 |  | 251,025
Finite-Lived Intangible Assets, Accumulated Amortization | $ (143,577) |  | (136,895)
Backlog [Member] |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Finite-Lived Intangible Asset, Useful Life | 0 months | 0 months |
Finite-Lived Intangible Assets, Gross | $ 13,550 |  | 13,550
Finite-Lived Intangible Assets, Accumulated Amortization | $ (13,550) |  | (13,550)
Developed Technology Rights [Member] |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Finite-Lived Intangible Asset, Useful Life | 4 years 7 months | 4 years 9 months |
Finite-Lived Intangible Assets, Gross | $ 24,874 |  | 24,874
Finite-Lived Intangible Assets, Accumulated Amortization | (18,288) |  | (17,924)
Tradenames And Trademarks [Member] |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Indefinite-Lived Intangible Assets (Excluding Goodwill) | $ 577,456 |  | $ 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=56944662&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=26713463&loc=d3e16323-109275 + Details
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