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Organization, Basis of Presentation and Summary of Significant Accounting Policies (Details Textual)
3 Months Ended 6 Months Ended
Jun. 30, 2020
USD ($)
Jun. 30, 2020
USD ($)
segment
Jun. 30, 2019
USD ($)
Dec. 31, 2019
USD ($)
Organization, Basis of Presentation and Summary of Significant Accounting Policies (Details) [Line Items]        
Taxable income minimum distribution portion not subject to federal taxation (in percentage) 90.00% 90.00%    
Real estate improvements   $ 19,200,000 $ 21,100,000  
Acquisition costs   0 $ 0  
Allowance for doubtful accounts receivable $ 14,800,000 $ 14,800,000   $ 8,200,000
Lessor, operating lease, lease modification deferral of base rent, percent 4.30%      
Number of segments | segment   1    
Minimum | Building        
Organization, Basis of Presentation and Summary of Significant Accounting Policies (Details) [Line Items]        
PPE useful life (in years)   39 years    
Minimum | Building Improvements        
Organization, Basis of Presentation and Summary of Significant Accounting Policies (Details) [Line Items]        
PPE useful life (in years)   10 years    
Minimum | Furniture and Fixtures        
Organization, Basis of Presentation and Summary of Significant Accounting Policies (Details) [Line Items]        
PPE useful life (in years)   3 years    
Maximum | Building        
Organization, Basis of Presentation and Summary of Significant Accounting Policies (Details) [Line Items]        
PPE useful life (in years)   40 years    
Maximum | Building Improvements        
Organization, Basis of Presentation and Summary of Significant Accounting Policies (Details) [Line Items]        
PPE useful life (in years)   20 years    
Maximum | Furniture and Fixtures        
Organization, Basis of Presentation and Summary of Significant Accounting Policies (Details) [Line Items]        
PPE useful life (in years)   10 years