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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 12 Months Ended
Sep. 30, 2016
Jun. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Dec. 31, 2015
Dec. 31, 2014
Earnings Per Share [Abstract]              
Net (loss) income $ 15,120 $ 15,120 $ 4,569 $ 43,630 $ (1,528) $ 43,630 $ (1,528)
Non-Convertible Preferred Stock Dividend (Series A,B and D) (1,627)   (1,627) (4,883) (4,884)    
Convertible Preferred Stock Dividend (Series C) (1,838)   (1,838) (5,513) (5,512)    
Income available to common shareholders 11,655   1,104 33,234 (11,924)    
Effect of assumed conversion of convertible preferred stock 1,838   1,838 5,513 5,512    
Income available to common sharesholders assuming conversion $ 13,493   $ 2,942 $ 38,747 $ (6,412)    
Average common shares outstanding 43,926   43,929 43,913 44,353    
Average potential common shares options 47   46 40 85    
Average potential common shares convertible preferred stock 7,138   7,171 7,138 7,171    
Average common shares outstanding and equivalents 51,111   51,146 51,091 51,609    
Earnings per common share - basic $ 0.27   $ 0.03 $ 0.76 $ (0.27)    
Earnings per common share - diluted $ 0.26   $ 0.03 $ 0.76 $ (0.27)