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Commitments and Contingencies (Details) - Dec. 31, 2015
$ in Thousands
Communities
Total
USD ($)
Long-term Purchase Commitment [Line Items]      
Number of Properties 133 2  
Costs Incurred to Date     $ 859,798
Expected Costs to Complete [1]     319,316
Wholly-owned — under development      
Long-term Purchase Commitment [Line Items]      
Number of Properties   1  
Costs Incurred to Date     124,072
Purchase Commitment, Remaining Minimum Amount Committed     217,928
Average Ownership Stake   100.00%  
Wholly-owned — redevelopment      
Long-term Purchase Commitment [Line Items]      
Number of Properties   3  
Costs Incurred to Date     11,302
Purchase Commitment, Remaining Minimum Amount Committed     16,698
Average Ownership Stake   100.00%  
Unconsolidated joint ventures      
Long-term Purchase Commitment [Line Items]      
Number of Properties   4  
Costs Incurred to Date     497,350
Purchase Commitment, Remaining Minimum Amount Committed     81,979
Participating Loan Investment Steele Creek Denver Colorado [Member]      
Long-term Purchase Commitment [Line Items]      
Number of Properties   1  
Costs Incurred to Date     90,747
Purchase Commitment, Remaining Minimum Amount Committed     2,711
Average Ownership Stake   0.00%  
Preferred Equity Investment West Coast Development JV [Member]      
Long-term Purchase Commitment [Line Items]      
Number of Properties   5  
Costs Incurred to Date     136,327
Purchase Commitment, Remaining Minimum Amount Committed     $ 0
Average Ownership Stake   48.00%  
[1] Represents 100% of project costs incurred to date.