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Investments in Unconsolidated Joint Ventures - Balance Sheet footnotes (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019 | Dec. 31, 2019
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Assets | $ 9,183,288 |  | $ 9,183,288 |  | $ 8,853,571
Liabilities | 6,534,751 |  | 6,534,751 |  | 6,022,601
Joint Venture |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Amortization of difference between cost of investments and book value of underlying equity | 3,361 | $ 5,354 | 11,089 | $ 15,164 |
Joint Venture | PPR Portfolio | PPR Portfolio |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Assets | 2,891,122 |  | 2,891,122 |  | 2,932,401
Liabilities | $ 1,708,455 |  | $ 1,708,455 |  | $ 1,732,976

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