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Subsequent Events (Narrative) (Details)
$ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2020
USD ($)
property
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Subsequent Event [Line Items]        
Aggregate base purchase price   $ 428,939 $ 241,772 $ 149,337
Subsequent Event        
Subsequent Event [Line Items]        
Number of properties purchased | property 2      
Aggregate base purchase price $ 5,300      
Properties sold | property 1      
Aggregate contract sale price $ 2,400