Stock-Based Compensation (Tables)

3 Months Ended

Mar. 31, 2018

Restricted stock and restricted stock units (“RSUs”) activity for the three months ended March 31, 2018 is summarized below.

Outstanding at	Restricted Stock and RSUs			Weighted- Average Grant Date Fair Value
December 31, 2017		2,608,668		$	342.79
Granted		753,901		$	565.83
Converted		(1,071,338	)	$	336.95
Forfeited		(6,721	)	$	408.89
March 31, 2018⁽¹⁾		2,284,510		$	418.94

⁽¹⁾	At March 31, 2018, approximately 2.1 million awards are expected to vest and 0.2 million awards have vested but have not been converted.

Performance-based RSU activity for the three months ended March 31, 2018 is summarized below.

Outstanding at	Performance- Based RSUs			Weighted- Average Grant Date Fair Value
December 31, 2017		903,525		$	335.12
Granted		199,068		$	566.44
Additional shares granted due to attainment of performance measures		23,376		$	343.86
Converted		(269,648	)	$	343.86
March 31, 2018		856,321		$	386.38

Market performance-based RSUs activity for the three months ended March 31, 2018 is summarized below.

Outstanding at	Market Performance- Based RSUs			Weighted- Average Grant Date Fair Value
December 31, 2017		286,336		$	195.33
Converted		(286,336	)	$	195.33
March 31, 2018		—		$	—

Stock option activity for the three months ended March 31, 2018 is summarized below

Outstanding at	Shares Under Option		Weighted Average Exercise Price
December 31, 2017		2,147,562	$	513.50
Granted		—	$	—
March 31, 2018		2,147,562	$	513.50