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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 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Earnings Per Share [Abstract]        
Net income $ 23,100 $ 3,319 $ 59,666 $ 35,573
Non-Convertible Preferred Stock Dividend (Series A,B and D) (1,628) (1,627) (4,883) (4,883)
Convertible Preferred Stock Dividend (Series C) (1,838) (1,838) (5,513) (5,513)
Income available to common shareholders 19,634 (146) 49,270 25,177
Effect of assumed conversion of convertible preferred stock 1,838 1,838 5,513 5,513
Income available to common sharesholders assuming conversion $ 21,472 $ 1,692 $ 54,783 $ 30,690
Average common shares outstanding 43,996 43,947 43,975 43,937
Average potential common shares options 209 17 110 20
Average potential common shares convertible preferred stock 7,259 7,138 7,259 7,138
Average common shares outstanding and equivalents 51,464 51,102 51,344 51,095
Earnings per common share - basic $ 0.45 $ 0 $ 1.12 $ 0.57
Earnings per common share - diluted $ 0.42 $ 0 $ 1.07 $ 0.56