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Investments in Unconsolidated Joint Ventures - Balance Sheet footnotes (Details) - Joint Venture - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018 | Dec. 31, 2018
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Total assets | $ 10,167,175 |  | $ 10,167,175 |  | $ 9,944,864
Amortization of difference between cost of investments and book value of underlying equity | 5,354 | $ 1,160 | 15,164 | $ 8,787 |
PPR Portfolio |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Total assets | 2,981,866 |  | 2,981,866 |  | 3,047,851
Total liabilities | $ 1,836,948 |  | $ 1,836,948 |  | $ 1,859,637

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