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Acquisitions (Details) - USD ($)
$ in Thousands
1 Months Ended 9 Months Ended
Aug. 31, 2019
Mar. 31, 2019
Sep. 30, 2019
Sep. 30, 2018
Business Acquisition [Line Items]        
Payments to acquire business     $ 58,206 $ 0
Pan Am Plaza Garage        
Business Acquisition [Line Items]        
Payments to acquire business   $ 29,500    
Nora Plaza        
Business Acquisition [Line Items]        
Payments to acquire business $ 29,000