Stock-Based Compensation (Tables)

6 Months Ended

Jun. 30, 2014

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, 2014	13,422,226		$	51.80	7.08	$	501,706
Options granted	32,500		89.13
Options exercised	(314,966	)	40.41
Options forfeited	(51,460	)	59.80
Options outstanding at March 31, 2014	13,088,300		$	52.14	6.89	$	517,164
Options granted	3,023,500		95.44
Options exercised	(1,128,975	)	39.80
Options forfeited	(49,560	)	65.22
Options outstanding at June 30, 2014	14,933,265		$	61.79	7.46	$	515,908
Vested and non-vested options expected to vest at June 30, 2014	13,478,241		$	60.92	7.37	$	477,353
Exercisable options at June 30, 2014	6,616,375		$	45.58	5.93	$	335,874

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, 2014	8,016,921		$	14.77
Options granted	32,500		21.23
Options vested	(7,000	)	16.98
Options forfeited	(51,460	)	14.82
Non-vested options at March 31, 2014	7,990,961		14.79
Options granted	3,023,500		17.23
Options vested	(2,648,011	)	13.95
Options forfeited	(49,560	)	15.31
Non-vested options at June 30, 2014	8,316,890		$	15.94

Summary of activity in the option plans

	Three months ended June 30,				Six months ended June 30,
	2014		2013		2014		2013
Total intrinsic value of stock options exercised	$	62,893	$	34,093	$	78,453	$	74,635
Total fair value of stock options vested	36,939		33,647		37,058		33,781