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Stockholders' Equity (Details 2) (USD $)
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12 Months Ended | |
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Dec. 31, 2012
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Dec. 31, 2010
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| Common Stock Repurchase Program | ||
| Value of shares repurchased | $ 605,000 | |
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Class A common stock
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| Common Stock Repurchase Program | ||
| Amount of shares authorized for repurchase | 500,000,000 | |
| Number of shares repurchased | 34,000 | |
| Value of shares repurchased | 605,000 | |
| Amount of shares that may be repurchased | $ 500,000,000 | |
| X | ||||||||||
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- Details
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| X | ||||||||||
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- Definition
The amount authorized by an entity's Board of Directors under a stock repurchase plan. No definition available.
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- Definition
The remaining repurchase amount authorized by an entity's Board of Directors under a stock repurchase plan. No definition available.
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- Definition
Number of shares that have been repurchased during the period and are being held in treasury. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Equity impact of the cost of common and preferred stock that were repurchased during the period. Recorded using the cost method. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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