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Investments in Joint Ventures (Narrative) (Details)
1 Months Ended 3 Months Ended 9 Months Ended
Feb. 28, 2014
USD ($)
Sep. 30, 2015
USD ($)
Sep. 30, 2014
USD ($)
Mar. 31, 2014
Sep. 30, 2015
USD ($)
Sep. 30, 2014
USD ($)
Mar. 31, 2015
USD ($)
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 Investments by Formed Unconsolidated Joint Venture             $ 450,000,000  
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   $ 1,400,000 $ 2,000,000   $ 4,400,000 $ 6,600,000    
Number of apartment homes in joint venture's operating properties sold 558              
Proceeds from sale of 2 JV 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%      
Sale of two operating properties within the funds in 2014 [Member]                
Schedule of Equity Method Investments [Line Items]                
Number of operating properties sold       2