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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, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Earnings Per Share [Abstract]        
Net (loss) income $ 4,569 $ 19,532 $ (1,528) $ 64,588
Non-Convertible Preferred Stock Dividend (Series A,B and D) (1,627) (1,627) (4,884) (4,882)
Convertible Preferred Stock Dividend (Series C) (1,838) (1,838) (5,512) (5,514)
Income available to common shareholders 1,104 16,067 (11,924) 54,192
Effect of assumed conversion of convertible preferred stock 1,838 1,838 5,512 5,514
Income available to common sharesholders assuming conversion $ 2,942 $ 17,905 $ (6,412) $ 59,706
Average common shares outstanding 43,929 45,055 44,353 45,131
Average potential common shares options 46 160 85 162
Average potential common shares convertible preferred stock 7,171 7,147 7,171 7,147
Average common shares outstanding and equivalents 51,146 52,362 51,609 52,440
Earnings per common share - basic $ 0.03 $ 0.36 $ (0.27) $ 1.2
Earnings per common share - diluted $ 0.03 $ 0.34 $ (0.27) $ 1.14