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Commitments and Contingencies (Details) (USD $) | 9 Months Ended
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Sep. 30, 2014 property
Real Estate Properties [Line Items] |  |
Number of communities owned (in communities) | 141 |
Costs Incurred to Date | $ 605,034,000 |
Expected Costs to Complete | 288,342,000 | [1]
Wholly owned — under development [Member] |  |
Real Estate Properties [Line Items] |  |
Capital Expenditures Incurred but Not yet Paid | 26,800,000 |
Number of communities owned (in communities) | 3 |
Costs Incurred to Date | 321,607,000 |
Expected Costs to Complete | 78,793,000 |
Average Ownership Stake | 100.00% |
Wholly owned — redevelopment [Member] |  |
Real Estate Properties [Line Items] |  |
Capital Expenditures Incurred but Not yet Paid | 2,100,000 |
Number of communities owned (in communities) | 1 |
Costs Incurred to Date | 80,619,000 |
Expected Costs to Complete | 17,381,000 |
Average Ownership Stake | 100.00% |
Unconsolidated joint ventures [Member] |  |
Real Estate Properties [Line Items] |  |
Number of communities owned (in communities) | 2 |
Costs Incurred to Date | 158,986,000 |
Expected Costs to Complete | 143,981,000 |
Average Ownership Stake | 51.00% |
Participating Loan Investment Steele Creek Denver Colorado [Member] |  |
Real Estate Properties [Line Items] |  |
Number of communities owned (in communities) | 1 |
Costs Incurred to Date | 43,822,000 |
Expected Costs to Complete | $ 48,187,000 |
Average Ownership Stake | 0.00% |
[1] | Costs incurred to date include $26.8 million and $2.1 million of accrued fixed assets for development and redevelopment, respectively.

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