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Acquisitions (Details)
$ in Thousands
12 Months Ended
Dec. 31, 2020
USD ($)
property
Dec. 31, 2019
USD ($)
property
Dec. 31, 2018
USD ($)
property
Business Acquisition [Line Items]      
Number of retail operating properties acquired | property     0
Payments to acquire real estate | $ $ 65,298 $ 58,205 $ 0
2020 Operating Property Acquisitions      
Business Acquisition [Line Items]      
Number of retail operating properties acquired | property 1    
2020 Operating Property Acquisitions | Retail Operating Property      
Business Acquisition [Line Items]      
Payments to acquire real estate | $ $ 65,300    
2019 Operating Property Acquisitions      
Business Acquisition [Line Items]      
Number of retail operating properties acquired | property   1  
Number of parking garages acquired | property   1  
2019 Operating Property Acquisitions | Retail Operating Property      
Business Acquisition [Line Items]      
Payments to acquire real estate | $   $ 29,000  
2019 Operating Property Acquisitions | Parking Garage      
Business Acquisition [Line Items]      
Payments to acquire real estate | $   $ 29,500  
Lease Agreements | 2020 Operating Property Acquisitions      
Business Acquisition [Line Items]      
Weighted average useful life (in years) 3 years 2 months 12 days    
Lease Agreements | 2019 Operating Property Acquisitions      
Business Acquisition [Line Items]      
Weighted average useful life (in years)   5 years 7 months 6 days