Stock-Based Compensation (Tables)

6 Months Ended

Jun. 30, 2017

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, 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	1,631		43.86
Exercised	(318	)	12.65
Cancelled	(218	)	35.37
Expired	—		—
Options outstanding at June 30, 2017	7,469		$	34.98	7.46	$	99,843
Options exercisable at June 30, 2017	3,525		$	26.69	5.92	$	75,462

Summary of restricted stock units activity

A summary of RSU activity during the six months ended June 30, 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	(14	)	33.03
Forfeited	(11	)	42.09
RSUs Outstanding at June 30, 2017	117		$	41.41