Stock-Based Compensation (Tables)

6 Months Ended

Jun. 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
Vested and non-vested options expected to vest at June 30, 2013	12,806,480		$	50.64	7.40	$	349,739
Exercisable options at June 30, 2013	6,143,659		$	41.17	6.04	$	225,898

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

Summary of activity in the option plans

	Three months ended June 30,				Six months ended June 30,
	2013		2012		2013		2012
Total intrinsic value of stock options exercised	$	34,093	$	16,118	$	74,635	$	40,937
Total fair value of stock options vested	33,647		30,763		33,781		30,882