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Investments in Unconsolidated Joint Ventures - Balance Sheet footnotes (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2017
Schedule of Equity Method Investments [Line Items]
Total assets	$ 9,622,771		$ 9,622,771		$ 9,687,943
Amortization of difference between cost of investments and book value of underlying equity	3,524	$ 4,197	7,627	$ 8,224
Northwestern Mutual Life (NML)
Schedule of Equity Method Investments [Line Items]
Mortgage notes payable to affiliate	701,884		701,884		482,332
Interest expense on borrowings from related party	7,158	$ 4,929	12,116	$ 8,089
PPR Portfolio
Schedule of Equity Method Investments [Line Items]
Total assets	3,059,530		3,059,530		3,106,105
Total liabilities	$ 1,859,679		$ 1,859,679		$ 1,872,227

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The item represents the amortization during the period of the difference between the amount at which an investment accounted for under the equity method of accounting is carried (reported) on the balance sheet and the amount of underlying equity in net assets the reporting Entity has in the investee.

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