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Stock Buy Back Plans (Details) (USD $) In Millions, except Share data, unless otherwise specified | 12 Months Ended | 0 Months Ended | 12 Months Ended
--- | --- | --- | ---
Dec. 31, 2011 | Feb. 24, 2010 Class A Common Stock [Member] | Dec. 31, 2010 Class A Common Stock [Member]
Equity, Class of Treasury Stock [Line Items] |  |  |
Stock repurchase program, authorized amount |  | $ 30.0 |
Stock repurchase program, expiration date | March 31, 2011 |  |
Number of shares purchased |  |  | 784,197
Stock repurchased during period related to employee withholding upon vesting of restricted stock, shares | 43,247 |  |
Stock repurchased during period related to employee withholding upon vesting of restricted stock, value | $ 1.5 |  |

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