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Earnings Per Common Share (Earnings per common share) (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Earning Per Common Share [Abstract]      
Net income $ 53,841 $ 84,410 $ 52,646
Non-Convertible Preferred Stock Dividend (Series A,B and D) (6,512) (6,511) (6,512)
Convertible Preferred Stock Dividend (Series C) 0 (5,513) (7,350)
Income available to common shareholders 47,329 72,386 38,784
Effect of assumed conversion of convertible preferred stock 0 5,513 7,350
Income available to common sharesholders assuming conversion $ 47,329 $ 77,899 $ 46,134
Average common shares outstanding 51,335 45,400 43,939
Average potential common shares options 384 142 19
Average potential common shares convertible preferred stock 0 5,807 7,138
Average common shares outstanding and equivalents 51,719 51,349 51,096
Earnings per common share - basic $ 0.92 $ 1.59 $ 0.88
Earnings per common share - diluted $ 0.92 $ 1.52 $ 0.88