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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

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