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Intangible Assets and Liabilities - Summary of Intangible Asset Account Activity (Details) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Intangible Assets, Net (Excluding Goodwill) [Abstract] |  |  |
Beginning balance, Finite-lived intangible assets, gross | $ 981,160 | $ 769,851 |
Intangible assets acquired | 0 | 242,039 |
Effect of change in exchange rates | (1,346) | (30,730) |
Ending balance, Finite-lived intangible assets, gross | 979,814 | 981,160 |
Finite-lived intangible liabilities, gross | (23,900) | (23,900) | $ 0
Customer contracts and relationships | 0 | (23,900) |
Effect of change in exchange rates | 0 | 0 |
Intangible assets, gross (excluding goodwill) | $ 979,814 | $ 981,160 |

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