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Summary of Intangible Asset Account Activity (Details) - USD ($) $ in Thousands | 9 Months Ended
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Sep. 30, 2017 | Sep. 30, 2016
Total Intangible Assets [Abstract] |  |
Beginning balance, intangible assets, gross | $ 669,896 | $ 702,507
Finite-lived Intangible Assets Acquired | 36,500 | 0
Effect of change in exchange rates | 57,640 | 2,309
Intangible Assets, Gross (Excluding Goodwill) | $ 764,036 | $ 704,816

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- Definition Amount of foreign currency translation gain (loss) which increases (decreases) assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + 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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