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Investments in Joint Ventures (Narrative) (Details)
3 Months Ended 9 Months Ended
Sep. 30, 2019
USD ($)
Sep. 30, 2018
USD ($)
Sep. 30, 2019
USD ($)
Sep. 30, 2018
USD ($)
Schedule of Equity Method Investments [Line Items]        
Number of joint ventures accounted for under equity method investments     2  
Maximum guaranteed amount of loans utilized for construction and development activities for joint ventures $ 0   $ 0  
Maximum Investments by Formed Unconsolidated Joint Venture 450,000,000   450,000,000  
Maximum Investments by Formed Unconsolidated Joint Venture 360,000,000   360,000,000  
Fees earned for property and asset management, construction, development, and other services to joint ventures $ 1,700,000 $ 1,500,000 $ 4,600,000 $ 4,300,000
Maximum [Member]        
Schedule of Equity Method Investments [Line Items]        
Equity method investment ownership percentage 40.00%   40.00%  
Minimum [Member]        
Schedule of Equity Method Investments [Line Items]        
Equity method investment ownership percentage 31.30%   31.30%