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Intangible Assets and Liabilities - Estimated Future Annual Amortization Expense (Details) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
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Intangible Assets, Net (Excluding Goodwill) [Abstract] |  |
2020 Amortization | $ 53,028 |
2020 Accretion | (8,028) |
2020 Amortization, net | 45,000 |
2021 Amortization | 37,705 |
2021 Accretion | (1,963) |
2021 Amortization, net | 35,742 |
2022 Amortization | 27,346 |
2022 Accretion | (459) |
2022 Amortization, net | 26,887 |
2023 Amortization | 19,785 |
2023 Accretion | 0 |
2023 Amortization, net | 19,785 |
2024 Amortization | 15,612 |
2024 Accretion | 0 |
2024 Amortization, net | 15,612 |
Beyond 2024 Amortization | 31,621 |
Beyond 2024 Accretion | 0 |
Beyond 2024 Amortization, net | 31,621 |
Total intangible assets subject to amortization | 185,097 | $ 257,583
Finite-lived intangible liabilities, net | (10,450) | $ (18,683)
Finite-lived intangible assets (liabilities), net | $ 174,647 |

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