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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, 2019 USD ($) | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($)
Basis of Presentation |  |  |  |
Ownership interest in subsidiaries (as a percent) |  | 100.00% |  |
Number of properties included in joint venture agreement | property | 1 |  |  |
Variable interest entity, consolidated, carrying amount of assets |  | $ 1,015,661 | $ 1,061,593 |
Variable interest entity, consolidated, carrying amount of liabilities |  | 704,344 | 714,226 |
Increase in capitalized above and below market leases rental income |  | 6,791 | 5,787 | $ 5,349
Amortization of acquired real estate leases and other intangible assets |  | $ 64,203 | $ 72,925 | $ 72,035
Above market lease, weighted average amortization period, lease term |  | 4 years 1 month 6 days |  |
Lease, weighted average amortization period, lease term |  | 8 years 2 months 12 days |  |
Below market lease, weighted average amortization period, lease term |  | 8 years 10 months 24 days |  |
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract] |  |  |  |
2020 |  | $ 41,458 |  |
2021 |  | 37,152 |  |
2022 |  | 33,307 |  |
2023 |  | 32,226 |  |
2024 |  | 27,168 |  |
Thereafter |  | $ 89,859 |  |
Land and Building | Real Estate Investment | Maximum |  |  |  |
Basis of Presentation |  |  |  |
Estimated useful lives (up to) |  | 40 years |  |

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