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Earnings Per Common Share (Schedule of Earnings Per Share Basic and Diluted) (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Earnings Per Common Share [Abstract]        
Net income $ 27,438 $ 7,383 $ 51,026 $ 54,832
Non-convertible preferred stock (Series A,B and D) (1,628) (1,628) (4,884) (4,884)
Income available to common shareholders $ 25,810 $ 5,755 $ 46,142 $ 49,948
Average common shares outstanding 51,342 51,345 51,361 51,327
Average potential common shares-options 185 427 202 368
Total weighted average common shares outstanding and equivalents 51,527 51,772 51,563 51,695
Earnings per common share - basic $ 0.50 $ 0.11 $ 0.90 $ 0.97
Earnings per common share - diluted $ 0.50 $ 0.11 $ 0.89 $ 0.97