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Stockholders' Equity (Details) In Thousands, unless otherwise specified	3 Months Ended	12 Months Ended
	Mar. 31, 2012	Dec. 31, 2011
Change in the number of shares of Class A common stock outstanding
Shares outstanding as of beginning of period	92,433	91,725
Shares issued as part of equity-based compensation plans and the Employee Stock Purchase Plan ("ESPP"), net of RSUs surrendered	323	708
Shares outstanding as of end of period	92,756	92,433

Total number of shares of common stock held by shareholders. May be all or portion of the number of common shares authorized. These shares represent the ownership interest of the common shareholders. Shares outstanding equals shares issued minus shares held in treasury and other adjustments, if any.

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- Definition

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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