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Stockholders' Equity (Earnings per common share) (Details) (USD $)
In Thousands, except Per Share data, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Earnings Per Share [Abstract]        
Net income $ 21,309 $ 37,539 $ 45,056 $ 58,731
Non-Convertible Preferred Stock Dividend (Series A,B and D) (1,628) (1,628) (3,256) (3,256)
Convertible Preferred Stock Dividend (Series C) (1,838) (1,838) (3,675) (3,675)
Income available to common shareholders 17,843 34,073 38,125 51,800
Effect of assumed conversion of convertible preferred stock 1,838 1,838 3,675 3,675
Income available to common sharesholders assuming conversion $ 19,681 $ 35,911 $ 41,800 $ 55,475
Average common shares outstanding 45,014 45,630 45,170 45,613
Average potential common shares options 200 200 168 178
Average potential common shares convertible preferred stock 7,138 7,138 7,138 7,138
Average common shares outstanding and equivalents 52,352 52,968 52,476 52,929
Earnings per common share - basic $ 0.40 $ 0.75 $ 0.84 $ 1.14
Earnings per common share - diluted $ 0.38 $ 0.68 $ 0.80 $ 1.05