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Investments in Unconsolidated Joint Ventures - Balance Sheet footnotes (Details) - Joint Venture - USD ($) $ in Thousands | 3 Months Ended |
--- | --- | ---
Mar. 31, 2019 | Mar. 31, 2018 | Dec. 31, 2018
Schedule of Equity Method Investments [Line Items] |  |  |
Total assets | $ 10,044,705 |  | $ 9,944,864
Amortization of difference between cost of investments and book value of underlying equity | 4,539 | $ 4,103 |
PPR Portfolio |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Total assets | 3,023,148 |  | 3,047,851
Total liabilities | $ 1,852,923 |  | $ 1,859,637

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