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Investments in Joint Ventures (Narrative) (Details)
3 Months Ended 6 Months Ended
Jun. 30, 2016
USD ($)
Jun. 30, 2015
USD ($)
Jun. 30, 2016
USD ($)
Jun. 30, 2015
USD ($)
Schedule of Equity Method Investments [Line Items]        
Number of joint ventures accounted for under equity method investments     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 $ 1,300,000 $ 1,500,000 $ 2,600,000 $ 3,000,000
Maximum [Member]        
Schedule of Equity Method Investments [Line Items]        
Equity method investment ownership percentage 31.30%   31.30%  
Minimum [Member]        
Schedule of Equity Method Investments [Line Items]        
Equity method investment ownership percentage 20.00%   20.00%