Share-Based Compensation Plans (Tables)

12 Months Ended

Dec. 31, 2015

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:

	2015		2014		2013
	(in thousands)
Expense:
Restricted stock units	$	21,761	$	17,197	$	20,827
Stock options		271		271		8
Employee stock purchase plan		2,307		1,834		1,466
	$	24,339	$	19,302	$	22,301

Summary of RSU Activity

The following table summarizes RSU activity for the year ended December 31, 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	801		$	34.68
Vested during 2015	(1,047	)	$	18.96
Forfeited during 2015	(31	)	$	28.96
RSUs unvested at December 31, 2015	2,060		$	27.47

Summary of Stock Option Activity

The following table summarizes stock option activity for the year ended December 31, 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		(554	)	$	18.40
Balance at December 31, 2015		132		$	27.66		8.0 years	$	1,091
Vested and expected to vest at December 31, 2015		132		$	27.66		8.0 years	$	1,091
Exercisable at December 31, 2015		66		$	27.66		8.0 years	$	545