Stockholders' Equity (Tables)

12 Months Ended

Dec. 31, 2013

Stockholders' Equity Note [Abstract]

Schedule of change in the number of shares of Class A common stock

The following sets forth the change in the number of shares of Class A common stock outstanding during the fiscal years ended December 31, 2013 and 2012:

	December 31,
	2013		2012
Shares outstanding as of beginning of period	84,395		92,433
Shares issued as part of equity-based compensation plans and the ESPP, net of shares surrendered	1,121		1,119
Shares repurchased into treasury stock	(276	)	(9,157	)
Shares outstanding as of end of period	85,240		84,395