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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 6 Months Ended 12 Months Ended
Jun. 30, 2016
Mar. 31, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Dec. 31, 2015
Dec. 31, 2014
Earnings Per Share [Abstract]              
Net (loss) income $ 14,339 $ 14,339 $ (3,109) $ 28,510 $ (6,097) $ 28,510 $ (6,097)
Non-Convertible Preferred Stock Dividend (Series A,B and D) (1,629)   (1,628) (3,256) (3,256)    
Convertible Preferred Stock Dividend (Series C) (1,837)   (1,838) (3,675) (3,675)    
Income available to common shareholders 10,873   (6,575) 21,579 (13,028)    
Effect of assumed conversion of convertible preferred stock 1,837   1,838 3,675 3,675    
Income available to common sharesholders assuming conversion $ 12,710   $ (4,737) $ 25,254 $ (9,353)    
Average common shares outstanding 43,914   44,505 43,906 44,569    
Average potential common shares options 43   110 37 148    
Average potential common shares convertible preferred stock 7,138   7,159 7,138 7,159    
Average common shares outstanding and equivalents 51,095   51,774 51,081 51,876    
Earnings per common share - basic $ 0.25   $ (0.15) $ 0.49 $ (0.29)    
Earnings per common share - diluted $ 0.25   $ (0.15) $ 0.49 $ (0.29)