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Common Stock - Dividends (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2021
Jun. 30, 2021
Mar. 31, 2021
Dec. 31, 2020
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Sep. 30, 2021
Sep. 30, 2020
Dec. 31, 2020
Nov. 04, 2021
Dividends Payable [Line Items]                      
Dividends per Common Share (in dollars per share) $ 0.165 $ 0.165 $ 0.165 $ 0.155 $ 0.155 $ 0.155 $ 0.155 $ 0.495   $ 0.620  
Amount $ 12,692 $ 12,768 $ 12,767 $ 11,983 $ 11,790 $ 11,761 $ 11,735 $ 38,227 $ 35,286 $ 47,269  
Subsequent Event                      
Dividends Payable [Line Items]                      
Dividends declared and payable (in dollars per share)                     $ 0.165