Equity Compensation Plans (Tables)

3 Months Ended

Mar. 31, 2016

Disclosure of Compensation Related Costs, Share-based Payments [Abstract]

Schedule of Other Share-based Compensation, Activity

A summary of the equity awards granted on April 1, 2016 is presented below.

Grant Date	Service Vesting Period	Stock Options	Restricted Stock	Common Stock
April 1, 2016	Four-year graded vesting	1,220,956	244,599	—
April 1, 2016	Not applicable	—	—	567

Summary of Stock Options Outstanding

A summary of the stock options outstanding and exercisable as of December 31, 2015 and March 31, 2016 and changes during the interim period are presented below:

	Number of Options		Weighted Average Exercise Price		Aggregate Intrinsic Value
Outstanding at December 31, 2015	9,117,733		$	40.17	$	334,691
Exercised	(140,440	)	$	33.38	$	5,678
Cancelled or expired	(21,439	)	$	65.07
Outstanding at March 31, 2016	8,955,854		$	40.21	$	355,631
Exercisable at March 31, 2016	6,397,323		$	29.70	$	321,249
Exercisable at December 31, 2015	6,541,229		$	29.81	$	307,924

Summary of Restricted Stock Awards

A summary of the status of the restricted stock awarded under the 2013 Incentive Plan as of December 31, 2015 and March 31, 2016 and changes during the interim period are presented below:

	Number of Shares		Weighted Average Grant Date Fair Value Per Share
Outstanding at December 31, 2015	533,768		$	66.25
Vested	(13,781	)	$	60.92
Forfeited	(3,499	)	$	62.65
Outstanding at March 31, 2016	516,488		$	65.87