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Issuances of Common Stock - Dividend Reinvestment and Stock Purchase Plan (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Dividend Reinvestment and Stock Purchase Plan      
Gross proceeds $ 11,232 $ 9,109 $ 8,437
DRSPP      
Dividend Reinvestment and Stock Purchase Plan      
Dividend Reinvestment and Stock Purchase Plan, authorized shares (in shares) 26,000,000    
Shares remaining for future issuance (in shares) 11,335,379    
Common stock | DRSPP      
Dividend Reinvestment and Stock Purchase Plan      
Shares of common stock issued (in shares) 168,000 149,289 117,522
Gross proceeds $ 11,200 $ 9,100 $ 8,400
Common stock | DRSPP waiver approval process      
Dividend Reinvestment and Stock Purchase Plan      
Shares of common stock issued (in shares) 0 0 0