Commitments to Acquire/Dispose of Real Estate - Separate Agreements to Dispose (Details) $ in Thousands	Jun. 30, 2019 USD ($) Property ApartmentUnit
Property/Unit schedule
Properties | Property	7
Apartment Units | ApartmentUnit	940
Sales Price	$ 341,075
Rental Properties Disposed [Member] | Consolidated [Member]
Property/Unit schedule
Properties | Property	7
Apartment Units | ApartmentUnit	940
Sales Price	$ 336,925
Land [Member]
Property/Unit schedule
Sales Price	$ 4,150