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Investments In Joint Ventures (Narrative) (Details)
 12 Months Ended
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Jun. 01, 2017
Direct Costs of Leased and Rented Property or Equipment $ 217,817,000 $ 206,780,000 $ 202,105,000  
Income (Loss) from Equity Method Investments, Net of Dividends or Distributions [1] $ 6,822,000 [2] $ 7,125,000 $ 6,168,000  
Number of joint ventures accounted for under equity method investments 3 3 3  
Maximum guaranteed amount of loans utilized for construction and development activities for joint ventures $ 0      
Fees earned for property and asset management, construction, development, and other services to joint ventures 5,800,000 $ 5,300,000 $ 5,800,000  
Maximum Investments by Formed Unconsolidated Joint Venture $ 450,000,000      
Number of Units in Real Estate Property       250
Minimum [Member]        
Equity method investment ownership percentage 20.00%      
Maximum [Member]        
Equity method investment ownership percentage 31.30%      
Hurricane [Member]        
Income (Loss) from Equity Method Investments, Net of Dividends or Distributions $ 400,000      
Non-consolidated entity [Member] | Hurricane [Member]        
Direct Costs of Leased and Rented Property or Equipment $ 1,300,000      
[1] Equity in income excludes our ownership interest of fee income from various services provided by us to the Funds
[2] Equity in income for the year ended December 31, 2017 includes our ownership interest of the hurricane related expenses of approximately $0.4 million.