Stockholders' Equity

6 Months Ended

Jun. 30, 2013

Stockholders' Equity Note [Abstract]

Stockholders' Equity

Stockholders’ Equity

The following table sets forth the change in the number of shares of our Class A common stock outstanding during the six months ended June 30, 2013 and during the fiscal year ended December 31, 2012:

	Six Months Ended		Twelve Months Ended
	June 30, 2013		December 31, 2012
Shares outstanding as of beginning of period	84,395		92,433
Shares issued as part of equity-based compensation plans and the Employee Stock Purchase Plan (“ESPP”), net of restricted stock units ("RSUs") surrendered	905		1,119
Shares repurchased into treasury stock	(226	)	(9,157	)
Shares outstanding as of end of period	85,074		84,395