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Summary of Intangible Asset Account Activity (Details) - USD ($) $ in Thousands | 3 Months Ended |  |
--- | --- | --- | ---
Mar. 31, 2018 | Mar. 31, 2017 | Dec. 31, 2017 | Dec. 31, 2016
Total Intangible Assets [Abstract] |  |  |  |
Beginning balance, intangible assets, gross | $ 769,851 | $ 669,896 |  |
Finite-lived Intangible Assets Acquired | 240,600 | 0 |  |
Effect of change in exchange rates | 22,979 | 16,168 |  |
Intangible Assets, Gross (Excluding Goodwill) | 1,033,430 | 686,064 |  |
Finite-lived intangible liabilities, Gross | (23,900) | 0 | $ 0 | $ 0
Finite-Lived Intangible Liabilities Acquired | (23,900) | 0 |  |
Finite-Lived Intangible Liabilities, Foreign Currency Translation Gain Loss | $ 0 | $ 0 |  |

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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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