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Stock-Based Compensation Plans (Tables)
 6 Months Ended
Jun. 30, 2016
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, 2016 and 2015 was as follows:

 

 

Three Months Ended June 30,

 

 

Six Months Ended June 30,

 

 

 

2016

 

 

 

2015

 

 

 

2016

 

 

 

2015

 

 

(In thousands)

 

Employees

$

3,299

 

 

$

2,900

 

 

$

6,575

 

 

$

5,639

 

Non-employee directors

 

144

 

 

 

150

 

 

 

362

 

 

 

386

 

Total stock-based compensation

$

3,443

 

 

$

3,050

 

 

$

6,937

 

 

$

6,025