Commitments to Acquire/Dispose of Real Estate - Separate Agreements to Dispose (Details) $ in Thousands	Mar. 31, 2020 USD ($) Property ApartmentUnit
Property/Unit schedule
Properties | Property	1
Apartment Units | ApartmentUnit	517
Sales Price	$ 331,650
Rental Properties Disposed [Member] | Partially Owned Properties – Consolidated
Property/Unit schedule
Properties | Property	1
Apartment Units | ApartmentUnit	517
Sales Price	$ 276,500
Land [Member]
Property/Unit schedule
Sales Price	$ 55,150