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Stockholders' Equity (Earnings per common share) (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Earnings Per Share [Abstract]    
Net income $ 23,747 $ 21,192
Nonconvertible Preferred Stock Dividend Serie A and D (1,628) (1,628)
Dividends Convertible Preferred Stock (1,837) (1,837)
Income available to common shareholders 20,282 17,727
Effect of assumed conversion of convertible preferred stock 1,837 1,837
Income available to common sharesholders assuming conversion $ 22,119 $ 19,564
Average common shares outstanding 45,329 45,595
Average potential common shares options 131 159
Average potential common shares convertible preferred stock 7,138 7,138