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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, 2017
Mar. 31, 2016
Earnings Per Share [Abstract]    
Net income (loss) $ 15,150 $ 14,171
Non-Convertible Preferred Stock Dividend (Series A,B and D) (1,627) (1,627)
Convertible Preferred Stock Dividend (Series C) (1,838) (1,838)
Income available to common shareholders 11,685 10,706
Effect of assumed conversion of convertible preferred stock 1,838 1,838
Income available to common sharesholders assuming conversion $ 13,523 $ 12,544
Average common shares outstanding 43,916 43,898
Average potential common shares options 77 28
Average potential common shares convertible preferred stock 7,138 7,138
Average common shares outstanding and equivalents 51,131 51,064
Earnings per common share - basic $ 0.27 $ 0.24
Earnings per common share - diluted $ 0.26 $ 0.24