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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
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Earnings Per Common Share [Abstract]      
Net income $ 74,327 $ 53,841 $ 84,410
Non-convertible preferred stock (Series A,B and D) (6,512) (6,512) (6,511)
Convertible Preferred Stock Dividend (Series C) 0 0 (5,513)
Income available to common shareholders 67,815 47,329 72,386
Effect of assumed conversion of convertible preferred stock 0 0 5,513
Income available to common shareholders assuming conversion $ 67,815 $ 47,329 $ 77,899
Average common shares outstanding 51,358 51,335 45,400
Average potential common shares-options 197 384 142
Average potential common shares convertible preferred stock 0 0 5,807
Total weighted average common shares outstanding and equivalents 51,555 51,719 51,349
Earnings per common share - basic $ 1.32 $ 0.92 $ 1.59
Earnings per common share - diluted $ 1.32 $ 0.92 $ 1.52