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Stock-Based Compensation Plans (Tables)
 6 Months Ended
Jun. 30, 2021
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,

 

 

 

2021

 

 

2020

 

 

2021

 

 

2020

 

 

 

(In thousands)

 

Employees

 

$

5,920

 

 

$

5,512

 

 

$

13,023

 

 

$

11,911

 

Non-employee directors

 

 

214

 

 

 

279

 

 

 

535

 

 

 

557

 

Total stock-based compensation

 

$

6,134

 

 

$

5,791

 

 

$

13,558

 

 

$

12,468