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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

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