Real Estate and Lease Intangibles - Real Estate Acquisitions and Dispositions (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2018 USD ($) Property ApartmentUnit
Properties acquired | Property	1
Property Units acquired | ApartmentUnit	117
Purchase Price | $	$ 53,700
Properties disposed | Property	4
Property Units disposed | ApartmentUnit	786
Sales Price | $	$ 290,020
Rental Properties - Consolidated [Member]
Properties acquired | Property	1
Property Units acquired | ApartmentUnit	117
Purchase Price | $	$ 53,700
Properties disposed | Property	4
Property Units disposed | ApartmentUnit	786
Sales Price | $	$ 290,020