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Commitments and Contingencies (Details) - Jun. 30, 2015 $ in Thousands | USD ($) Communities
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Real Estate Properties [Line Items] |
Number of communities owned (in communities) | Communities | 136
Costs Incurred to Date | $ 647,838
Expected Costs to Complete | 436,828
Wholly owned — under development [Member] |
Real Estate Properties [Line Items] |
Capital Expenditures Incurred but Not yet Paid | $ 100
Number of communities owned (in communities) | 1
Costs Incurred to Date | $ 92,645
Expected Costs to Complete | $ 249,355
Average Ownership Stake | 100.00%
Wholly owned — redevelopment [Member] |
Real Estate Properties [Line Items] |
Capital Expenditures Incurred but Not yet Paid | $ 1,300
Number of communities owned (in communities) | 1
Costs Incurred to Date | $ 4,854
Expected Costs to Complete | $ 10,146
Average Ownership Stake | 100.00%
Unconsolidated joint ventures [Member] |
Real Estate Properties [Line Items] |
Number of communities owned (in communities) | 4
Costs Incurred to Date | $ 335,539
Expected Costs to Complete | $ 163,791
Participating Loan Investment Steele Creek Denver Colorado [Member] |
Real Estate Properties [Line Items] |
Number of communities owned (in communities) | 1
Costs Incurred to Date | $ 85,208
Expected Costs to Complete | $ 6,801
Average Ownership Stake | 0.00%
Preferred Equity Investment West Coast Development JV [Member] |
Real Estate Properties [Line Items] |
Number of communities owned (in communities) | 5
Costs Incurred to Date | $ 129,592
Expected Costs to Complete | $ 6,735
Average Ownership Stake | 48.00%

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