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Stockholders' Equity (Details)	9 Months Ended	12 Months Ended
Stockholders' Equity (Details)	Sep. 30, 2011	Dec. 31, 2010
Change in the number of shares of Class A common stock outstanding
Shares outstanding as of beginning of period	91,725,000	93,883,000
Shares issued as part of equity-based compensation plans and the Employee Stock Purchase Plan ("ESPP"), net of RSUs surrendered	403	461
Shares repurchased into treasury stock		(2,619)
Shares outstanding as of end of period	92,128,000

Number of shares (or other type of equity) issued during the period as a result of any equity-based compensation plan other than an employee stock ownership plan (ESOP), net of any shares forfeited. Shares issued could result from the issuance of restricted stock, the exercise of stock options, stock issued under employee stock purchase plans, and/or other employee benefit plans.

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