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Intangible Assets - Carrying Value of Intangible Assets (Details) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
--- | --- | --- | ---
Intangible Assets [Line Items] |  |  |
Goodwill, Gross carrying amount | $ 1,478,257 | $ 1,385,995 |
Goodwill, Accumulated amortization | 0 | 0 |
Goodwill, Net carrying amount | 1,478,257 | 1,385,995 | $ 1,385,115
Finite-lived intangible assets, Gross Carrying Amount | 913,956 | 786,189 |
Finite-lived intangible assets, Accumulated amortization | (463,207) | (349,779) |
Finite-lived intangible assets, Net carrying amount | 450,749 | 436,410 |
Indefinite-lived intangible assets, Carrying amount | 94,458 | 123,672 |
Intangible assets, Gross carrying amount | 1,008,414 | 909,861 |
Intangible assets, Net carrying amount | 545,207 | 560,082 | $ 655,871
Trademarks [Member] |  |  |
Intangible Assets [Line Items] |  |  |
Indefinite-lived intangible assets, Carrying amount | 92,758 | 121,972 |
In-Process Research and Development [Member] |  |  |
Intangible Assets [Line Items] |  |  |
Indefinite-lived intangible assets, Carrying amount | 1,700 | 1,700 |
Developed Technology [Member] |  |  |
Intangible Assets [Line Items] |  |  |
Finite-lived intangible assets, Gross Carrying Amount | 498,649 | 420,928 |
Finite-lived intangible assets, Accumulated amortization | (318,366) | (239,233) |
Finite-lived intangible assets, Net carrying amount | 180,283 | 181,695 |
Customer Relationships [Member] |  |  |
Intangible Assets [Line Items] |  |  |
Finite-lived intangible assets, Gross Carrying Amount | 320,550 | 309,112 |
Finite-lived intangible assets, Accumulated amortization | (98,175) | (77,872) |
Finite-lived intangible assets, Net carrying amount | 222,375 | 231,240 |
Trademarks [Member] |  |  |
Intangible Assets [Line Items] |  |  |
Finite-lived intangible assets, Gross Carrying Amount | 56,794 | 20,534 |
Finite-lived intangible assets, Accumulated amortization | (18,648) | (10,915) |
Finite-lived intangible assets, Net carrying amount | 38,146 | 9,619 |
In-Process Research and Development [Member] |  |  |
Intangible Assets [Line Items] |  |  |
Finite-lived intangible assets, Gross Carrying Amount | 23,428 | 22,977 |
Finite-lived intangible assets, Accumulated amortization | (13,483) | (9,121) |
Finite-lived intangible assets, Net carrying amount | 9,945 | 13,856 |
Backlog [Member] |  |  |
Intangible Assets [Line Items] |  |  |
Finite-lived intangible assets, Gross Carrying Amount | 14,535 | 12,638 |
Finite-lived intangible assets, Accumulated amortization | (14,535) | (12,638) |
Finite-lived intangible assets, Net carrying amount | $ 0 | $ 0 |

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- Definition Intangible Assets [Line Items] + References No definition available. + Details
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- Definition Amount before amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details
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