Share-Based Compensation Plans (Tables)

6 Months Ended

Jun. 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 June 30,				Six Months Ended June 30,
(in thousands)	2019		2018		2019		2018
Expense:
RSUs	$	6,805	$	6,652	$	25,153	$	25,178
Employee stock purchase plan		953		974		2,202		1,957
	$	7,758	$	7,626	$	27,355	$	27,135

Summary of RSU Activity

The following table summarizes RSU activity for the six months ended June 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		734		$	51.36
Vested during 2019		(790	)	$	44.44
Forfeited during 2019		(15	)	$	46.72
Unvested at June 30, 2019		1,177		$	48.81