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Revenue Recognition - Disaggregation of Revenue (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Property management fees        
Disaggregation of Revenue [Line Items]        
Other fee income $ 536 $ 592 $ 1,549 $ 1,818
Asset management fees        
Disaggregation of Revenue [Line Items]        
Other fee income 271 278 827 795
Leasing commissions and other fees        
Disaggregation of Revenue [Line Items]        
Other fee income 72 198 179 220
Other fee income        
Disaggregation of Revenue [Line Items]        
Other fee income $ 879 $ 1,068 $ 2,555 $ 2,833