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Intangible Assets Summary of Intangible Asset Account Activity (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016
Total Intangible Assets [Abstract] |  |
Beginning balance, Finite-Lived Intangible Assets, Gross | $ 669,896 | $ 702,507
Intangible assets acquired | 36,500 | 0
Effect of change in exchange rates | 63,455 | (32,611)
Ending balance, Finite-Lived Intangible Assets, Gross | $ 769,851 | $ 669,896

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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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