Stock-Based Compensation (Tables)

3 Months Ended

Mar. 31, 2017

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

Summary of stock option activity

A summary of stock option activity during the three months ended March 31, 2017 is as follows (in thousands, except for per share amounts):

	Shares		Weighted- Average Exercise Price (in dollars per share)		Weighted- Average Contractual Life (In Years)	Aggregate Intrinsic Value
Options outstanding at December 31, 2016	6,374		$	31.60
Granted	1,365		45.36
Exercised	(76	)	23.59
Cancelled	(45	)	35.94
Expired	—		—
Options outstanding at March 31, 2017	7,618		$	34.12	8.11	$	77,755
Options exercisable at March 31, 2017	3,414		$	24.33	7.02	$	60,263
Options vested or expected to vest at March 31, 2017	7,618		$	34.12	8.11	$	77,755

Summary of restricted stock units activity

A summary of RSU activity during the three months ended March 31, 2017 is as follows (in thousands, except for per share amounts):

	RSUs		Weighted- Average Grant Date Fair Value  (in dollars  per share)
RSUs Outstanding at December 31, 2016	57		$	33.03
Granted	85		45.65
Vested	—		—
Forfeited	(1	)	45.65
RSUs Outstanding at March 31, 2017	141		$	41.95