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Investments in Joint Ventures (Narrative) (Details)
1 Months Ended 3 Months Ended 6 Months Ended
Feb. 28, 2014
USD ($)
Jun. 30, 2015
USD ($)
Jun. 30, 2014
USD ($)
Jun. 30, 2015
USD ($)
Jun. 30, 2014
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 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   1,500,000 $ 2,000,000 3,000,000 $ 4,700,000  
Maximum Investments by Formed Unconsolidated Joint Venture   $ 450,000,000   $ 450,000,000    
Number of apartment homes in joint venture's operating properties sold 558          
Proceeds from sale of 2 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%