Commitments to Acquire/Dispose of Real Estate - Separate Agreements to Dispose (Details) - Subsequent Event [Member] $ in Thousands	Feb. 20, 2020 USD ($) Property ApartmentUnit
Property/Unit schedule
Properties | Property	4
Apartment Units | ApartmentUnit	1,416
Sales Price	$ 778,650
Rental Properties Disposed [Member] | Partially Owned Properties – Consolidated
Property/Unit schedule
Properties | Property	4
Apartment Units | ApartmentUnit	1,416
Sales Price	$ 723,500
Land [Member]
Property/Unit schedule
Sales Price	$ 55,150