Quarterly report pursuant to Section 13 or 15(d)

Stockholders' Equity Dividend Reinvestment and Direct Stock Purchase Plan (Details)

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Stockholders' Equity Dividend Reinvestment and Direct Stock Purchase Plan (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Equity [Abstract]        
Number of common shares reserved for issuance under dividend reinvestment plan (in shares) 3,750,000   3,750,000  
Number of common shares issued from dividend reinvestment plan and outstanding as of period-end (in shares) 370,605   370,605  
Accumulated proceeds from issuance of common shares from dividend reinvestment plan $ 5.6   $ 5.6  
Number of common shares issued during period from dividend reinvestment plan (in shares) 12,374 13,968 39,392 50,729
Proceeds from issuance of common shares during period from dividend reinvestment plan $ 0.1 $ 0.1 $ 0.3 $ 0.3