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Investments in Joint Ventures (Narrative) (Details) - USD ($)		3 Months Ended		9 Months Ended
		Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Schedule of Equity Method Investments [Line Items]
Equity method investment ownership percentage		31.30%		31.30%
Income (Loss) from Equity Method Investments, Net of Dividends or Distributions	[1]	$ 2,540,000	$ 2,154,000	$ 6,652,000	$ 5,909,000
Maximum guaranteed amount of loans utilized for construction and development activities for joint ventures		0		0
Maximum Investments by Formed Unconsolidated Joint Venture		360,000,000		360,000,000
Fees earned for property and asset management, construction, development, and other services to joint ventures		$ 1,800,000	$ 1,900,000	$ 4,900,000	$ 5,700,000
Maximum [Member]
Schedule of Equity Method Investments [Line Items]
Equity method investment ownership percentage		40.00%		40.00%
[1] Equity in income for the nine months ended September 30, 2020 includes our ownership interest of the Resident Relief Funds payments of approximately $0.4 million.

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- Definition

Revenue earned by providing property management, construction, development, and other services to joint ventures.

+ References

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- Definition

Maximum investment by formed unconsolidated joint venture including leverage of approximately 50% of the estimated value of the underlying real estate after to change in June 2019.

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- Definition

The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 323
-SubTopic 10
-Section 50
-Paragraph 3
-Subparagraph (a)(1)
-URI http://asc.fasb.org/extlink&oid=114001798&loc=d3e33918-111571

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- Definition

Maximum potential amount of future payments (undiscounted) the guarantor could be required to make under the guarantee or each group of similar guarantees before reduction for potential recoveries under recourse or collateralization provisions.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 460
-SubTopic 10
-Section 50
-Paragraph 4
-Subparagraph (b)(1)
-URI http://asc.fasb.org/extlink&oid=124440162&loc=d3e12069-110248

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- Definition

This element represents the undistributed income (or loss) of equity method investments, net of dividends or other distributions received from unconsolidated subsidiaries, certain corporate joint ventures, and certain noncontrolled corporations; such investments are accounted for under the equity method of accounting. This element excludes distributions that constitute a return of investment, which are classified as investing activities.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-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

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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