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Summary Of Significant Accounting Policies (Details)
12 Months Ended
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Property, Plant and Equipment [Line Items]      
Section 1031 exchanges outstanding 1    
Reverse Section 1031 exchanges outstanding   1  
Impairment of real estate $ 0 $ 0 $ 0
Bad debt reserve $ 3,300,000 $ 1,700,000  
Stock repurchase program, number of shares authorized to be repurchased, percentage of weighted-average shares 5.00%    
Land Improvements      
Property, Plant and Equipment [Line Items]      
Property, plant and equipment, useful life 15 years    
Building and Building Improvements      
Property, Plant and Equipment [Line Items]      
Property, plant and equipment, useful life 30 years    
Minimum | Furniture, Fixtures, and Equipment      
Property, Plant and Equipment [Line Items]      
Property, plant and equipment, useful life 5 years    
Maximum | Furniture, Fixtures, and Equipment      
Property, Plant and Equipment [Line Items]      
Property, plant and equipment, useful life 7 years