Share-Based Compensation Plans (Tables)

3 Months Ended

Mar. 31, 2019

Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]

Costs Associated with Share-Based Compensation Plans

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

	Three Months Ended March 31,
(in thousands)	2019		2018
Expense:
RSUs	$	18,348	$	18,526
Employee stock purchase plan		1,249		983
	$	19,597	$	19,509

Summary of RSU Activity

The following table summarizes RSU activity for the three months ended March 31, 2019:

(in thousands, except weighted-average grant-date fair value)	Shares			Weighted-average grant-date fair value
Unvested at December 31, 2018		1,248		$	44.53
Granted during 2019		702		$	51.42
Vested during 2019		(753	)	$	44.54
Forfeited during 2019		(6	)	$	45.70
Unvested at March 31, 2019		1,191		$	48.58