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Investments in Joint Ventures (Narrative) (Details) | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2016 USD ($) | Jun. 30, 2015 USD ($) | Jun. 30, 2016 USD ($) | Jun. 30, 2015 USD ($)
Schedule of Equity Method Investments [Line Items] |  |  |  |
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 | $ 1,300,000 | $ 1,500,000 | $ 2,600,000 | $ 3,000,000
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% |

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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 + Details
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