Stock-Based Compensation (Tables)

9 Months Ended

Sep. 30, 2013

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 January 1, 2013	13,446,719		$	43.39	7.08	$	268,596
Options exercised	(1,043,444	)	31.30
Options forfeited	(58,500	)	50.58
Options outstanding at March 31, 2013	12,344,775		$	44.37	7.06	$	373,596
Options granted	2,742,150		78.00
Options exercised	(843,615	)	38.03
Options forfeited	(44,720	)	48.69
Options outstanding at June 30, 2013	14,198,590		$	51.23	7.49	$	379,390
Options granted	40,850		76.77
Options exercised	(378,310	)	39.63
Options forfeited	(26,980	)	57.17
Options outstanding at September 30, 2013	13,834,150		$	51.61	7.29	$	358,182
Vested and non-vested options expected to vest at September 30, 2013	12,497,070		$	51.02	7.20	$	330,899
Exercisable options at September 30, 2013	5,768,549		$	41.28	5.80	$	208,247

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

	Options		Weighted Average Fair Value at Grant Date
Non-vested options at January 1, 2013	7,951,177		$	13.36
Options vested	(8,620	)	15.62
Options forfeited	(58,500	)	13.50
Non-vested options at March 31, 2013	7,884,057		13.35
Options granted	2,742,150		17.41
Options vested	(2,526,556	)	13.32
Options forfeited	(44,720	)	13.40
Non-vested options at June 30, 2013	8,054,931		14.75
Options granted	40,850		17.97
Options vested	(3,200	)	14.97
Options forfeited	(26,980	)	14.24
Non-vested options at September 30, 2013	8,065,601		$	14.76

Summary of activity in the stock option plans

	Three months ended September 30,				Nine months ended September 30,
	2013		2012		2013		2012
Total intrinsic value of stock options exercised	$	16,456	$	36,383	$	91,091	$	77,320
Total fair value of stock options vested	49		41		33,830		30,922