Stock-Based Compensation Plans (Tables)

6 Months Ended

Jun. 30, 2019

Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]

Stock-Based Compensation Expense

Total stock-based compensation expense was as follows:

	Three Months Ended June 30,				Six Months Ended June 30,
	2019		2018		2019		2018
	(In thousands)
Employees	$	5,645	$	3,393	$	10,561	$	7,085
Non-employee directors		284		257		564		516
Total stock-based compensation	$	5,929	$	3,650	$	11,125	$	7,601