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Dividend Reinvestment Plan (Details) - shares
3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Dividend Reinvestment Plan        
Number of shares issued under the dividend reinvestment plan 70,000 59,000 77,000 111,000
Maximum        
Dividend Reinvestment Plan        
Discount rate (as a percent)     5.00%