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Earnings Per Common Share (Earnings per common share) (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Earnings Per Common Share [Abstract]    
Net income $ 23,470 $ 16,917
Non-Convertible Preferred Stock Dividend (Series A,B and D) (1,628) (1,627)
Convertible Preferred Stock Dividend (Series C) 0 (1,838)
Income available to common shareholders 21,842 13,452
Effect of assumed conversion of convertible preferred stock 0 1,838
Income available to common sharesholders assuming conversion $ 21,842 $ 15,290
Average common shares outstanding 51,305 43,955
Average potential common shares options 321 28
Average potential common shares convertible preferred stock 0 7,138
Average common shares outstanding and equivalents 51,626 51,121
Earnings per common share - basic $ 0.43 $ 0.31
Earnings per common share - diluted $ 0.42 $ 0.3