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Investments in Unconsolidated Joint Ventures - Balance Sheet Footnotes (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016	Dec. 31, 2016
Investments in unconsolidated joint ventures:
Total assets	$ 9,739,985		$ 9,739,985		$ 9,791,249
Amortization of difference between cost of investments and book value of underlying equity	4,197	$ 4,669	8,224	$ 9,126
Northwestern Mutual Life (NML)
Investments in unconsolidated joint ventures:
Mortgage notes payable to affiliate	487,077		487,077		265,863
Interest expense on borrowings from related party	4,929	$ 4,992	8,089	$ 11,358
PPR Portfolio
Investments in unconsolidated joint ventures:
Total assets	3,126,583		3,126,583		3,179,255
Total liabilities	$ 1,881,513		$ 1,881,513		$ 1,887,952

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