Real Estate - Acquired Properties From Unaffiliated Parties (Details) $ in Thousands	3 Months Ended
Mar. 31, 2019 USD ($) Property ApartmentUnit
Properties acquired \| Property	3
Property Units acquired \| ApartmentUnit	579
Purchase Price \| $	$ 258,650
Rental Properties - Consolidated [Member]
Properties acquired \| Property	3
Property Units acquired \| ApartmentUnit	579
Purchase Price \| $	$ 258,650

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