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Issuances of Common Stock - Dividend Reinvestment and Stock Purchase Plan (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Dividend Reinvestment and Stock Purchase Plan        
Gross proceeds     $ 5,322 $ 4,815
DRSPP        
Dividend Reinvestment and Stock Purchase Plan        
Dividend Reinvestment and Stock Purchase Plan, authorized shares (in shares) 26,000,000   26,000,000  
Shares remaining for future issuance (in shares) 11,420,562   11,420,562  
Common stock | DRSPP        
Dividend Reinvestment and Stock Purchase Plan        
Shares of common stock issued (in shares) 39,423 44,817 82,817 78,817
Gross proceeds $ 2,700 $ 2,400 $ 5,300 $ 4,800