Share-Based Compensation (Tables)

9 Months Ended

Sep. 30, 2016

Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]

Expenses Associated with Share-Based Compensation Plans

The following table presents compensation expense associated with the Company’s share-based compensation plans:

	Three Months Ended September 30,				Nine Months Ended September 30,
(in thousands)	2016		2015		2016		2015
Expense:
RSUs	$	5,401	$	4,059	$	25,766	$	18,278
Stock options		68		68		203		203
Employee stock purchase plan		659		571		2,127		1,780
	$	6,128	$	4,698	$	28,096	$	20,261

Summary of RSU Activity

The following table summarizes RSU activity for the nine months ended September 30, 2016:

(in thousands, except weighted-average grant-date fair value)	Shares			Weighted-average grant-date fair value
RSUs unvested at December 31, 2015		1,354		$	29.20
Granted during 2016		967			36.77
Vested during 2016		(726	)		30.76
Forfeited during 2016		(20	)		31.48
RSUs unvested at September 30, 2016		1,575		$	33.10

Summary of Stock Option Activity

The following table summarizes stock option activity for the nine months ended September 30, 2016:

(in thousands, except weighted-average exercise price and contractual term)	Number outstanding		Weighted- average exercise price		Weighted- average remaining contractual term		Aggregate intrinsic value
Balance at December 31, 2015		132	$	27.66
Exercised during 2016		—		—
Balance at September 30, 2016		132	$	27.66		7.2 years	$	1,391
Vested and expected to vest at September 30, 2016		132	$	27.66		7.2 years	$	1,391
Exercisable at September 30, 2016		66	$	27.66		7.2 years	$	696