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Intangible Assets and Liabilities - Summary of Intangible Asset Account Activity (Details) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Intangible Assets, Net (Excluding Goodwill) [Abstract] |  |  |
Beginning balance, Finite-lived intangible assets, gross | $ 979,814 | $ 981,160 |
Effect of change in exchange rates | 38,363 | (1,346) |
Ending balance, Finite-lived intangible assets, gross | 1,000,037 | 979,814 |
FiniteLivedIntangibleAssetsDisposedInSaleOfBusiness | (18,140) | 0 |
Finite-lived intangible liabilities, gross | (23,900) | (23,900) | $ (23,900)
Effect of change in exchange rates | 0 | 0 |
Intangible assets, gross (excluding goodwill) | $ 1,000,037 | $ 979,814 |

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