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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, 2016
Dec. 31, 2015
Dec. 31, 2014
Earnings Per Share [Abstract]      
Net income (loss) $ 59,186 $ (2,504) $ 85,181
Non-Convertible Preferred Stock Dividend (Series A,B and D) (6,512) (6,512) (6,512)
Convertible Preferred Stock Dividend (Series C) (7,350) (7,350) (7,350)
Income available to common shareholders 45,324 (16,366) 71,319
Effect of assumed conversion of convertible preferred stock 7,350 7,350 7,350
Income available to common sharesholders assuming conversion $ 52,674 $ (9,016) $ 78,669
Average common shares outstanding 43,913 44,231 45,024
Average potential common shares options 37 68 155
Average potential common shares convertible preferred stock 7,138 7,156 7,147
Average common shares outstanding and equivalents 51,088 51,455 52,326
Earnings per common share - basic $ 1.03 $ (0.37) $ 1.58
Earnings per common share - diluted $ 1.03 $ (0.37) $ 1.5