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Intangible Assets and Liabilities - Estimated Future Annual Amortization Expense (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
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Intangible Assets, Net (Excluding Goodwill) [Abstract] |  |
2021 Amortization | $ 38,033 |
2021 Accretion | (1,962) |
2021 Amortization, net | 36,071 |
2022 Amortization | 27,599 |
2022 Accretion | (459) |
2022 Amortization, net | 27,140 |
2023 Amortization | 19,955 |
2023 Accretion | 0 |
2023 Amortization, net | 19,955 |
2024 Amortization | 15,746 |
2024 Accretion | 0 |
2024 Amortization, net | 15,746 |
2025 Amortization | 14,742 |
2025 Accretion | 0 |
2025 Amortization, net | 14,742 |
Beyond 2025 Amortization | 16,880 |
Beyond 2025 Accretion | 0 |
Beyond 2025 Amortization, net | 16,880 |
Total intangible assets subject to amortization (accretion) | 132,955 | $ 185,097
Finite-lived intangible liabilities, net | (2,421) | $ (10,450)
Finite-lived intangible assets (liabilities), net | $ 130,534 |

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