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Intangible Assets and Liabilities - Summary of Intangible Asset Account Activity (Details) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Intangible Assets, Net (Excluding Goodwill) [Abstract] |  |  |
Beginning balance, Finite-lived intangible assets, gross | $ 769,851 | $ 669,896 |
Intangible assets acquired | 242,039 | 36,500 |
Effect of change in exchange rates | (30,730) | 63,455 |
Ending balance, Finite-lived intangible assets, gross | 978,060 | 769,851 |
Finite-lived intangible liabilities, gross | (23,900) | 0 | $ 0
Customer contracts and relationships | (23,900) | 0 |
Effect of change in exchange rates | 0 | 0 |
Intangible assets, gross (excluding goodwill) | $ 981,160 | $ 769,851 |

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