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Investments in Unconsolidated Joint Ventures - Balance Sheet footnotes (Details) - Joint Venture - USD ($) $ in Thousands | 3 Months Ended |
--- | --- | ---
Mar. 31, 2020 | Mar. 31, 2019 | Dec. 31, 2019
Schedule of Equity Method Investments [Line Items] |  |  |
Total assets | $ 10,166,921 |  | $ 10,196,707
Amortization of difference between cost of investments and book value of underlying equity | 3,999 | $ 4,539 |
PPR Portfolio |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Total assets | 2,911,512 |  | 2,932,401
Total liabilities | $ 1,709,593 |  | $ 1,732,976

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