Stockholders' Equity (Tables)

6 Months Ended

Jun. 30, 2012

Stockholders' Equity Note [Abstract]

Employee Stock Purchase Plan

The following table summarizes Employee Stock Purchase Plan (the “ESPP”) activity in the three and six months ended June 30, 2012 and 2011 (table in thousands, except per share amounts):

	Purchase Period Ended
	January 31,
	2012		2011
Cash proceeds	$	32,861	$	26,813
Class A common shares purchased	424		407
Weighted-average price per share	$	77.58	$	65.90

Summary Of Restricted Stock Activity

The following table summarizes restricted stock activity since January 1, 2012 (stock units in thousands):

	Number of Stock Units		Weighted- Average Grant Date Fair Value (per stock unit)
Outstanding, January 1, 2012	9,540		$	72.74
Granted	5,052		106.17
Vested	(2,148	)	66.85
Forfeited	(748	)	74.39
Outstanding, June 30, 2012	11,696		88.61