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Investments in Joint Ventures (Narrative) (Details) - USD ($) | 3 Months Ended
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Mar. 31, 2020 | Mar. 31, 2019
Schedule of Equity Method Investments [Line Items] |  |
Equity method investment ownership percentage | 31.30% |
Maximum guaranteed amount of loans utilized for construction and development activities for joint ventures | $ 0 |
Maximum Investments by Formed Unconsolidated Joint Venture | 450,000,000 |
Maximum Investments by Formed Unconsolidated Joint Venture | 360,000,000 |
Fees earned for property and asset management, construction, development, and other services to joint ventures | $ 1,800,000 | $ 1,500,000
Maximum [Member] |  |
Schedule of Equity Method Investments [Line Items] |  |
Equity method investment ownership percentage | 40.00% |
Minimum [Member] |  |
Schedule of Equity Method Investments [Line Items] |  |
Equity method investment ownership percentage | 20.00% |

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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. + References No definition available. + Details
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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 + Details
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