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Investments in Joint Ventures (Narrative) (Details) | 1 Months Ended | 3 Months Ended | 6 Months Ended |
--- | --- | --- | --- | ---
Feb. 28, 2014 USD ($) | Jun. 30, 2015 USD ($) | Jun. 30, 2014 USD ($) | Jun. 30, 2015 USD ($) | Jun. 30, 2014 USD ($) | Dec. 31, 2014
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |
Equity method investment ownership percentage |  | 31.30% | 20.00% | 31.30% | 20.00% | 31.30%
Number of joint ventures accounted for under equity method investments | 2 |  |  | 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 |  | 1,500,000 | $ 2,000,000 | 3,000,000 | $ 4,700,000 |
Maximum Investments by Formed Unconsolidated Joint Venture |  | $ 450,000,000 |  | $ 450,000,000 |  |
Number of apartment homes in joint venture's operating properties sold | 558 |  |  |  |  |
Proceeds from sale of 2 operating properties | $ 65,600,000 |  |  |  |  |
Gain on sale of unconsolidated JV property | $ 3,600,000 |  |  |  |  |
Formation of Unconsolidated Joint Venture [Member] |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |
Equity method investment ownership percentage |  | 20.00% |  | 20.00% |  |

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