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v3.20.4

Summary of Significant Accounting Policies - Basis of Presentation and Real Estate Properties (Details) $ in Thousands | 1 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2017 property | Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($)
Basis of Presentation |  |  |  |
Ownership interest in subsidiaries (as a percent) |  | 100.00% |  |
Number of properties included in joint venture agreement | property | 1 |  |  |
Total assets |  | $ 6,476,424 | $ 6,653,826 | $ 7,160,426
Liabilities |  | 3,857,202 | 3,776,776 |
Increase in capitalized above and below market leases rental income |  | 7,405 | 6,791 | 5,787
Amortization of acquired real estate leases and other intangible assets |  | $ 48,669 | 64,203 | $ 72,925
Above market lease, weighted average amortization period, lease term |  | 3 years 8 months 12 days |  |
Lease, weighted average amortization period, lease term |  | 7 years 4 months 24 days |  |
Below market lease, weighted average amortization period, lease term |  | 7 years 10 months 24 days |  |
Finite lived intangible asset, future amortization |  |  |  |
2021 |  | $ 36,770 |  |
2022 |  | 32,959 |  |
2023 |  | 31,961 |  |
2024 |  | 27,108 |  |
2025 |  | 23,724 |  |
Thereafter |  | $ 66,161 |  |
Ownership interest in joint venture |  | 55.00% |  |
Variable Interest Entity, Primary Beneficiary |  |  |  |
Basis of Presentation |  |  |  |
Total assets |  | $ 970,142 | 1,015,661 |
Liabilities |  | $ 697,129 | $ 704,344 |
Land and Building | Real Estate Investment | Maximum |  |  |  |
Basis of Presentation |  |  |  |
Estimated useful lives (up to) |  | 40 years |  |

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