Stock-Based Compensation (Tables)

6 Months Ended

Jun. 30, 2011

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, 2010	12,706,324		$	33.93	7.18	$	239,534
Options granted	35,000		53.41
Options exercised	(576,454	)	20.68
Options forfeited	(38,300	)	37.49
Options outstanding at March 31, 2011	12,126,570		34.54		7.08	$	240,698
Options granted	2,506,350		53.48
Options exercised	(303,328	)	31.42
Options forfeited	(82,300	)	38.10
Options outstanding at June 30, 2011	14,247,292		$	37.92	7.38	$	228,952
Vested and non-vested options expected to vest at June 30, 2011	13,152,814		$	37.42	7.27	$	218,000
Exercisable options at June 30, 2011	6,528,916		$	31.42	5.90	$	147,365

Schedule 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, 2010	7,623,976		$	12.78
Options granted	35,000		16.98
Options forfeited	(38,300	)	12.63
Non-vested options at March 31, 2011	7,620,676		$	12.80
Options granted	2,506,350		14.15
Options vested	(2,326,350	)	12.23
Options forfeited	(82,300	)	12.82
Non-vested options at June 30, 2011	7,718,376		$	13.41

Summary of activity in the option plans

	Three months ended June 30,				Six months ended June 30,
	2011		2010		2011		2010
Total intrinsic value of stock options exercised	$	6,739	$	5,914	$	26,402	$	9,699
Total fair value of stock options vested	28,446		23,665		28,446		23,667