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Consolidated Statements of Stockholders Equity and Comprehensive Income (Deficit) (Parenthetical) (USD $)
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Exercise of stock options 586,563 113,359 368,178
Conversion of shares of Class B common stock to Class A common stock     50,000
Purchase of treasury stock 36,553 83,802 53,597
Interest rate on convertible notes     2.875%
Preferred stock dividend shares $ 63.80 $ 63.80 $ 63.80
Additional Paid-in Capital [Member]
      
Exercise of stock options 586,563 113,359 368,178
Conversion of shares of Class B common stock to Class A common stock     50,000
Interest rate on convertible notes     2.875%
Accumulated Deficit [Member]
      
Preferred stock dividend shares $ 63.80 $ 63.80 $ 63.80
Treasury Stock [Member]
      
Purchase of treasury stock 36,553 83,802 53,597