Stock-Based Compensation (Tables)

9 Months Ended

Sep. 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
Options exercised	(82,067	)	34.16
Options forfeited	(39,400	)	40.93
Options outstanding at September 30, 2011	14,125,825		$	37.93	7.13	$	86,994
Vested and non-vested options expected to vest at September 30, 2011	13,102,554		$	37.46	7.02	$	84,581
Exercisable options at September 30, 2011	6,450,449		$	31.39	5.64	$	66,899

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, 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
Options vested	(3,600	)	12.65
Options forfeited	(39,400	)	13.18
Non-vested options at September 30, 2011	7,675,376		$	13.41

Summary of activity in the option plans

	Three months ended September 30,				Nine months ended September 30,
	2011		2010		2011		2010
Total intrinsic value of stock options exercised	$	1,519	$	13,566	$	27,921	$	23,265
Total fair value of stock options vested	46		31		28,492		23,698