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

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

 

 

Three Months Ended September 30,

 

 

Nine Months Ended September 30,

 

 

2017

 

 

2016

 

 

2017

 

 

2016

 

 

(In thousands)

 

Employees

$

3,280

 

 

$

3,387

 

 

$

10,273

 

 

$

9,963

 

Non-employee directors

 

241

 

 

 

312

 

 

 

716

 

 

 

673

 

Total stock-based compensation

$

3,521

 

 

$

3,699

 

 

$

10,989

 

 

$

10,636