Stock-Based Compensation (Tables)

6 Months Ended

Jun. 30, 2016

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

Summary of stock option activity

A summary of stock option activity during the six months ended June 30, 2016 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, 2015	4,408		$	28.75
Granted	1,821		33.85
Exercised	(76	)	21.90
Cancelled	(73	)	38.18
Expired	—		—
Options outstanding at June 30, 2016	6,080		$	30.25	8.31	$	72,281
Options exercisable at June 30, 2016	2,227		$	15.93	6.86	$	48,459
Options vested or expected to vest at June 30, 2016	5,949		$	30.05	8.29	$	71,598

Summary of restricted stock units activity

A summary of RSU activity during the six months ended June 30, 2016 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, 2015	—	$	—
Granted	59	33.03
Vested	—	—
Forfeited	—	—
RSUs Outstanding at June 30, 2016	59	$	33.03