Stock-Based Compensation (Tables)

6 Months Ended

Jun. 30, 2012

Stock-Based Compensation

Schedule of stock option activity

	Options		Weighted Average Exercise Price		Weighted Average Remaining Contractual Term (in years)	Aggregate Intrinsic Value
Options outstanding at December 31, 2011	14,016,900		$	38.00	6.89	$	125,067
Options exercised	(853,460	)	26.23
Options forfeited	(123,000	)	38.53
Options outstanding at March 31, 2012	13,040,440		$	38.77	6.79	$	273,830
Options granted	2,954,000		53.26
Options exercised	(511,270	)	25.99
Options forfeited	(58,540	)	43.47
Options outstanding at June 30, 2012	15,424,630		$	41.95	7.26	200,023
Vested and non-vested options expected to vest at June 30, 2012	14,211,300		$	41.44	7.14	$	191,524
Exercisable options at June 30, 2012	7,376,767		$	35.64	5.77	$	142,205

Summary of status of non-vested options and changes during the year

	Options		Weighted Average Fair Value at Grant Date
Non-vested options at December 31, 2011	7,636,576		$	13.41
Options vested	(7,000	)	16.98
Options forfeited	(123,000	)	12.52
Non-vested options at March 31, 2012	7,506,576		13.43
Options granted	2,954,000		12.94
Options vested	(2,354,173	)	13.07
Options forfeited	(58,540	)	13.51
Non-vested options at June 30, 2012	8,047,863		$	13.35

Summary of activity in the option plans

	Three months ended June 30,				Six months ended June 30,
	2012		2011		2012		2011
Total intrinsic value of stock options exercised	$	16,118	$	6,739	$	40,937	$	26,402
Total fair value of stock options vested	30,763		28,446		30,882		28,446