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Consolidated Statements of Stockholders' Equity (Parenthetical) (USD $)
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Exercise of stock options 682,263 586,563 113,359
Purchase of treasury stock 97,430 36,553 83,802
Preferred stock dividend shares $ 63.80 $ 63.80 $ 63.80
Treasury Stock [Member]
      
Purchase of treasury stock 97,430 36,553 83,802
Additional Paid-in Capital [Member]
      
Exercise of stock options 682,263 586,563 113,359
Accumulated Deficit [Member]
      
Preferred stock dividend shares $ 63.80 $ 63.80 $ 63.80