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Investments in Real Estate Entities (Details) (USD $) | 3 Months Ended | 6 Months Ended | 3 Months Ended | 6 Months Ended |  | 3 Months Ended | 6 Months Ended |  | 1 Months Ended | 6 Months Ended
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Jun. 30, 2014 | Jun. 30, 2013 | Jun. 30, 2014 | Jun. 30, 2013 | Jun. 30, 2014 Fund I Weymouth Place home | Jun. 30, 2014 Fund I Springs | Jun. 30, 2014 Fund I Springs | Jun. 30, 2014 Unconsolidated real estate entities entity | Jun. 30, 2014 Unconsolidated real estate entities Minimum | Jun. 30, 2014 Unconsolidated real estate entities Maximum | Jun. 30, 2014 Joint venture | Jun. 30, 2014 Residual JV | Jun. 30, 2014 Residual JV | Jun. 30, 2014 Prepaid Expenses and Other Current Assets [Member] | Jun. 30, 2014 Secured notes | Jun. 30, 2014 Secured notes Notes payable maturing in 2014 Fund I Springs
Investment in Real Estate Entities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of unconsolidated real estate entities |  |  |  |  |  |  |  | 7 |  |  |  |  |  |  |  |
Ownership interest percentage |  |  |  |  |  |  |  |  | 15.20% | 31.30% |  |  |  |  |  |
Number of apartment homes sold |  |  |  |  | 616 |  |  |  |  |  |  |  |  |  |  |
Proceeds from sale of real estate |  |  |  |  | $ 90,750,000 |  |  |  |  |  |  |  | $ 43,112,000 |  |  |
Gain on sale of communities | 5,682,000 | 11,216,000 | 5,682,000 | 65,267,000 | 2,972,000 |  | 14,132,000 |  |  |  |  | 6,658,000 | 7,548,000 |  |  |
Percentage of gain (loss) from sale of real estate recognized in income |  |  |  |  |  | 100.00% |  |  |  |  |  |  |  |  |  |
Gain on sale of land | 0 | 240,000 | 0 | 240,000 |  |  | 16,656,000 |  |  |  |  |  |  |  |  |
Noncontrolling interest, ownership percentage by noncontrolling owners |  |  |  |  |  | 84.80% | 84.80% |  |  |  |  |  |  |  |  |
Repayments of secured mortgages |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 5,914,000 | 21,748,000
Fixed rate (as a percent) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 6.06%
Variable interest entity, ownership percentage |  |  |  |  |  |  |  |  |  |  | 70.00% |  |  |  |  |
Variable interest entity, ownership interest by noncontrolling interest |  |  |  |  |  |  |  |  |  |  | 30.00% |  |  |  |  |
Company funded venture |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 5,284,000 |  |

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