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Investments in Real Estate Partnerships - Scheduled Principal Repayments on Notes Payable (Details) - USD ($) $ in Thousands | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Schedule of Equity Method Investments [Line Items] |  |
2022 | $ 17,237 |
2023 | 74,071 |
2024 | 345,591 |
2025 | 293,732 |
2026 | 291,922 |
Beyond 5 Years | 2,719,895 |
Unamortized debt premium/(discount) and issuance costs | (23,504) |
Total | 3,718,944 | $ 3,923,084
Unsecured Debt [Member] |  |
Schedule of Equity Method Investments [Line Items] |  |
Total | 3,243,991 | $ 3,239,609
Unconsolidated Investments in Partnership [Member] |  |
Schedule of Equity Method Investments [Line Items] |  |
2022 | 269,929 |
2023 | 174,864 |
2024 | 35,567 |
2025 | 139,249 |
2026 | 127,757 |
Beyond 5 Years | 706,202 |
Unamortized debt premium/(discount) and issuance costs | (8,701) |
Total | 1,444,867 |
Unconsolidated Investments in Partnership [Member] | Mortgages [Member] | Scheduled Principal Payments [Member] |  |
Schedule of Equity Method Investments [Line Items] |  |
2022 | 7,736 |
2023 | 3,256 |
2024 | 1,877 |
2025 | 2,249 |
2026 | 2,471 |
Beyond 5 Years | 8,723 |
Unamortized debt premium/(discount) and issuance costs | 0 |
Total | 26,312 |
Unconsolidated Investments in Partnership [Member] | Mortgages [Member] | Mortgage Loan Maturities [Member] |  |
Schedule of Equity Method Investments [Line Items] |  |
2022 | 254,893 |
2023 | 171,608 |
2024 | 33,690 |
2025 | 137,000 |
2026 | 125,286 |
Beyond 5 Years | 697,479 |
Unamortized debt premium/(discount) and issuance costs | (8,701) |
Total | 1,411,255 |
Unconsolidated Investments in Partnership [Member] | Unsecured Debt [Member] | Unsecured Maturities [Member] |  |
Schedule of Equity Method Investments [Line Items] |  |
2022 | 7,300 |
2023 | 0 |
2024 | 0 |
2025 | 0 |
2026 | 0 |
Beyond 5 Years | 0 |
Unamortized debt premium/(discount) and issuance costs | 0 |
Total | 7,300 |
Unconsolidated Investments in Partnership, Pro-rata Share [Member] [Member] |  |
Schedule of Equity Method Investments [Line Items] |  |
2022 | 98,932 |
2023 | 65,149 |
2024 | 14,233 |
2025 | 42,169 |
2026 | 41,768 |
Beyond 5 Years | 257,620 |
Unamortized debt premium/(discount) and issuance costs | (3,080) |
Total | $ 516,791 |

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