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Investments in Unconsolidated Joint Ventures - Balance Sheet Footnotes (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016	Dec. 31, 2016
Investments in unconsolidated joint ventures:
Total assets	$ 9,714,773		$ 9,714,773		$ 9,791,249
Amortization of difference between cost of investments and book value of underlying equity	4,227	$ 4,988	12,451	$ 14,114
Northwestern Mutual Life (NML)
Investments in unconsolidated joint ventures:
Mortgage notes payable to affiliate	484,716		484,716		265,863
Interest expense on borrowings from related party	4,903	$ 2,775	12,992	$ 14,133
PPR Portfolio
Investments in unconsolidated joint ventures:
Total assets	3,120,534		3,120,534		3,179,255
Total liabilities	$ 1,878,719		$ 1,878,719		$ 1,887,952

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