Stock-Based Compensation (Tables)

9 Months Ended

Sep. 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
Options granted	11,000		59.19
Options exercised	(1,232,760	)	30.65
Options forfeited	(72,920	)	46.27
Options outstanding at September 30, 2012	14,129,950		$	42.93	7.22	$	225,358
Vested and non-vested options expected to vest at September 30, 2012	12,971,873		$	41.44	7.11	$	212,372
Exercisable options at September 30, 2012	6,147,810		$	36.64	5.71	$	136,703

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
Options granted	11,000		14.53
Options vested	(3,803	)	10.65
Options forfeited	(72,920	)	13.63
Non-vested options at September 30, 2012	7,982,140		$	13.36

Summary of activity in the option plans

	Three months ended September 30,				Nine months ended September 30,
	2012		2011		2012		2011
Total intrinsic value of stock options exercised	$	36,383	$	1,519	$	77,320	$	27,921
Total fair value of stock options vested	41		46		30,922		28,492