XML 41 R31.htm IDEA: XBRL DOCUMENT v3.20.2
Real Estate Properties - Narrative (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2020
Jun. 30, 2019
Real Estate [Abstract]      
Real estate improvements   $ 4,300 $ 8,500
COVID-19      
Unusual or Infrequent Item, or Both [Line Items]      
Deferred collection of rental income $ 42