Summary of Significant Accounting Policies - Basis of Presentation (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Segment Reporting Information [Line Items]
Equity in earnings of unconsolidated real estate ventures - gain on sale of real estate assets and purchase of joint venture partners' interests	$ 69,199	$ 2,857	$ 4,022
Rental Operations [Member]
Segment Reporting Information [Line Items]
Equity in earnings of unconsolidated real estate ventures - gain on sale of real estate assets and purchase of joint venture partners' interests			(4,022)
Property Management Acquisition and Development [Member]
Segment Reporting Information [Line Items]
Equity in earnings of unconsolidated real estate ventures - gain on sale of real estate assets and purchase of joint venture partners' interests	$ 69,199	2,857	$ 4,022
Reclass Adjustment [Member] | Rental Operations [Member]
Segment Reporting Information [Line Items]
Equity in earnings of unconsolidated real estate ventures - gain on sale of real estate assets and purchase of joint venture partners' interests		(2,857)
Reclass Adjustment [Member] | Property Management Acquisition and Development [Member]
Segment Reporting Information [Line Items]
Equity in earnings of unconsolidated real estate ventures - gain on sale of real estate assets and purchase of joint venture partners' interests		$ 2,857