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Investments in Unconsolidated Joint Ventures - Balance Sheet Footnotes (Details) - USD ($) $ in Thousands | 3 Months Ended |
--- | --- | ---
Mar. 31, 2018 | Mar. 31, 2017 | Dec. 31, 2017
Schedule of Equity Method Investments [Line Items] |  |  |
Total assets | $ 9,596,977 |  | $ 9,687,943
Amortization of difference between cost of investments and book value of underlying equity | 4,103 | $ 4,027 |
Northwestern Mutual Life (NML) |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Mortgage notes payable to affiliate | 704,402 |  | 482,332
Interest expense on borrowings from related party | 4,958 | $ 3,160 |
PPR Portfolio |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Total assets | 3,068,722 |  | 3,106,105
Total liabilities | $ 1,864,302 |  | $ 1,872,227

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