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Stockholders' Equity - Dividends (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Dec. 31, 2020
Equity [Abstract]      
Dividends declared per common share (in dollars per share) $ 0.04 $ 0.04  
Amount available for ordinary dividends of the Company's insurance company subsidiaries $ 18,519   $ 13,418