Share-Based Compensation Plans (Tables)

9 Months Ended

Sep. 30, 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 September 30,				Nine Months Ended September 30,
(in thousands)	2019		2018		2019		2018
Expense:
RSUs	$	6,608	$	6,392	$	31,761	$	31,570
Employee stock purchase plan		948		849		3,150		2,806
	$	7,556	$	7,241	$	34,911	$	34,376

Summary of RSU Activity

The following table summarizes RSU activity for the nine months ended September 30, 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		758		$	51.31
Vested during 2019		(822	)	$	44.49
Forfeited during 2019		(19	)	$	47.44
Unvested at September 30, 2019		1,165		$	48.91