Real Estate - Disposed Properties to Unaffiliated Parties (Details) $ in Thousands	9 Months Ended
	Sep. 30, 2019 USD ($) Property ApartmentUnit
Properties disposed | Property	11
Property Units disposed | ApartmentUnit	2,147
Sales Price	$ 1,103,075
Rental Properties - Consolidated [Member]
Properties disposed | Property	9
Property Units disposed | ApartmentUnit	1,202
Sales Price	$ 706,675
Rental Properties - Unconsolidated [Member]
Properties disposed | Property	2
Property Units disposed | ApartmentUnit	945
Sales Price	$ 394,500
Land Parcels [Member]
Sales Price	$ 1,900