Real Estate - Acquired Properties From Unaffiliated Parties (Details) $ in Thousands	6 Months Ended
Jun. 30, 2019 USD ($) Property ApartmentUnit
Properties acquired \| Property	6
Property Units acquired \| ApartmentUnit	1,644
Purchase Price	$ 650,882
Rental Properties - Consolidated [Member]
Properties acquired \| Property	6
Property Units acquired \| ApartmentUnit	1,644
Purchase Price	$ 634,650
Land Parcels [Member]
Purchase Price	$ 16,232

Amount of assets acquired at the acquisition date.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=84161108&loc=d3e4845-128472

Name:	us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssets
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant