Stock-Based Compensation (Tables)

9 Months Ended

Sep. 30, 2017

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

Summary of stock option activity

A summary of stock option activity during the nine months ended September 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	1,977		43.54
Exercised	(1,301	)	12.43
Cancelled	(802	)	40.01
Expired	(15	)	65.62
Options outstanding at September 30, 2017	6,233		$	38.23	7.90	$	41,269
Options exercisable at September 30, 2017	2,798		$	32.85	6.77	$	32,626

Summary of restricted stock units activity

A summary of RSU activity during the nine months ended September 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	(18	)	40.72
RSUs Outstanding at September 30, 2017	110		$	41.59