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Summary of Significant Accounting Policies - COVID-19 (Details) - COVID 19
$ in Thousands
 3 Months Ended
Mar. 31, 2021
USD ($)
ft²
Unusual or Infrequent Item, or Both [Line Items]  
Rent collected (as a percent) 99.00%
Area of land | ft² 7,200
Purchase price of restaurant building by tenant $ 575
Maximum  
Unusual or Infrequent Item, or Both [Line Items]  
Rent relief granted $ 20