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Subsequent Events (Details) - USD ($)
$ in Thousands
6 Months Ended
Aug. 10, 2020
Jun. 30, 2020
Jun. 30, 2019
Subsequent Event [Line Items]      
Purchase price   $ 14,818 $ 22,508
Subsequent Event | Pleasanton, California property      
Subsequent Event [Line Items]      
Purchase price $ 29,800    
Contingency period 74 days    
Closing sf sale after contingency period 45 days    
Additional days for the contingency period 30 days