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Stock-Based Compensation Plans (Tables)
 6 Months Ended
Jun. 30, 2017
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]  
Stock-Based Compensation Expense

Stock-based compensation expense for the three and six months ended June 30, 2017 and 2016 was as follows:

 

 

Three Months Ended June 30,

 

 

Six Months Ended June 30,

 

 

2017

 

 

2016

 

 

2017

 

 

2016

 

 

(In thousands)

 

Employees

$

3,292

 

 

$

3,299

 

 

$

6,993

 

 

$

6,575

 

Non-employee directors

 

232

 

 

 

144

 

 

 

475

 

 

 

362

 

Total stock-based compensation

$

3,524

 

 

$

3,443

 

 

$

7,468

 

 

$

6,937