Real Estate and Lease Intangibles - Real Estate Acquisitions and Dispositions (Details) $ in Thousands	6 Months Ended
	Jun. 30, 2017 USD ($) Property ApartmentUnit
Properties acquired | Property	1
Property Units acquired | ApartmentUnit	136
Purchase Price	$ 57,028
Properties disposed | Property	3
Property Units disposed | ApartmentUnit	904
Sales Price	$ 300,150
Rental Properties – Consolidated [Member]
Properties acquired | Property	1
Property Units acquired | ApartmentUnit	136
Purchase Price	$ 57,028
Properties disposed | Property	3
Property Units disposed | ApartmentUnit	904
Sales Price	$ 266,700
Land [Member]
Purchase Price	9,200
Sales Price	$ 33,450