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Rental Property - Gain on Involuntary Conversion (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Gain on involuntary conversion $ 0 $ 657 $ 0 $ 657
Operating Income (Loss) [Member]        
Gain on involuntary conversion   $ 700   $ 700