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Investments in Joint Ventures (Narrative) (Details)		3 Months Ended		6 Months Ended
		Jun. 30, 2018 USD ($)	Jun. 30, 2017 USD ($)	Jun. 30, 2018 USD ($)	Jun. 30, 2017 USD ($)
Schedule of Equity Method Investments [Line Items]
Equity method investment ownership percentage		20.00%		20.00%
Equity in income of joint ventures	[1]	$ 1,872,000	$ 1,785,000	$ 3,701,000	$ 3,602,000
Number of joint ventures accounted for under equity method investments				3
Maximum guaranteed amount of loans utilized for construction and development activities for joint ventures		0		$ 0
Fees earned for property and asset management, construction, development, and other services to joint ventures		$ 1,400,000	$ 1,400,000	$ 2,800,000	$ 2,700,000
Maximum [Member]
Schedule of Equity Method Investments [Line Items]
Equity method investment ownership percentage		31.30%		31.30%
Minimum [Member]
Schedule of Equity Method Investments [Line Items]
Equity method investment ownership percentage		20.00%		20.00%
[1] Equity in income excludes our ownership interest of fee income from various services provided by us to the Funds.

X

- Definition

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

+ References

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Number of joint ventures accounted for under equity method investments.

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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://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 323
-SubTopic 10
-Section 50
-Paragraph 3
-Subparagraph (a)(1)
-URI http://asc.fasb.org/extlink&oid=66011266&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://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 460
-SubTopic 10
-Section 50
-Paragraph 4
-Subparagraph (b)(1)
-URI http://asc.fasb.org/extlink&oid=82913245&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://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585

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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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