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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, 2018
Dec. 31, 2017
Dec. 31, 2016
Earnings Per Common Share [Abstract]      
Net income $ 84,410 $ 52,646 $ 59,186
Non-Convertible Preferred Stock Dividend (Series A,B and D) (6,511) (6,512) (6,512)
Convertible Preferred Stock Dividend (Series C) (5,513) (7,350) (7,350)
Income available to common shareholders 72,386 38,784 45,324
Effect of assumed conversion of convertible preferred stock 5,513 7,350 7,350
Income available to common sharesholders assuming conversion $ 77,899 $ 46,134 $ 52,674
Average common shares outstanding 45,400 43,939 43,913
Average potential common shares options 142 19 37
Average potential common shares convertible preferred stock 5,807 7,138 7,138
Average common shares outstanding and equivalents 51,349 51,096 51,088
Earnings per common share - basic $ 1.59 $ 0.88 $ 1.03
Earnings per common share - diluted $ 1.52 $ 0.88 $ 1.03