Share-Based Compensation (Tables)

9 Months Ended

Sep. 30, 2015

Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]

Expenses Associated with Share-Based Compensation Plans

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

	Three Months Ended September 30,				Nine Months Ended September 30,
(in thousands)	2015		2014		2015		2014
Expense:
RSUs	$	4,059	$	2,910	$	18,278	$	14,275
Stock options		68		68		203		203
Employee stock purchase plan		571		465		1,780		1,484
	$	4,698	$	3,443	$	20,261	$	15,962

Summary of RSU Activity

The following table summarizes RSU activity for the nine months ended September 30, 2015:

(in thousands, except weighted-average grant-date fair value)	Shares			Weighted-average grant-date fair value
RSUs unvested at December 31, 2014	2,337		$	21.21
Granted during 2015	750		$	34.74
Vested during 2015	(986	)	$	18.44
Forfeited during 2015	(22	)	$	28.27
RSUs unvested at September 30, 2015	2,079		$	27.33

Summary of Stock Option Activity

The following table summarizes stock option activity for the nine months ended September 30, 2015:

(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, 2014		686		$	20.18
Exercised during 2015		(307	)	$	16.79
Balance at September 30, 2015		379		$	22.94		3.0 years	$	6,107
Vested and expected to vest at September 30, 2015		379		$	22.94		3.0 years	$	6,107
Exercisable at September 30, 2015		279		$	21.26		1.1 years	$	4,974