The difference between the carrying value and the sale price of real estate or properties that were intended to be sold or held for capital appreciation or rental income. This element refers to the gain (loss) included in earnings and not to the cash proceeds of the sale. This element is a noncash adjustment to net income when calculating net cash generated by operating activities using the indirect method.

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 360
-SubTopic 10
-Section 50
-Paragraph 3
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=109226691&loc=d3e2941-110230

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=123570139&loc=d3e3602-108585

Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 360
-SubTopic 10
-Section 45
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=123351718&loc=d3e2443-110228

Name:	us-gaap_GainLossOnSaleOfProperties
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

Deferred Income (Details) $ in Thousands	9 Months Ended
Deferred Income (Details) $ in Thousands	Sep. 30, 2021 USD ($)	Jan. 29, 2021 property	Dec. 31, 2020 USD ($)
Disaggregation of Revenue [Line Items]
Deferred revenue \| $	$ 581		$ 9,315
UHF
Disaggregation of Revenue [Line Items]
Gain on sale \| $	$ 8,730
Multifamily Properties \| McKinney Texas Limestone Ranch \| UHF
Disaggregation of Revenue [Line Items]
Number of real estate properties \| property		208
Multifamily Properties \| Lewisville Texas \| UHF
Disaggregation of Revenue [Line Items]
Number of real estate properties \| property		252