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Pension Plan (Tables)
 6 Months Ended
Jun. 30, 2016
Defined Benefit Pension Plans and Defined Benefit Postretirement Plans Disclosure [Abstract]  
Components Of Net Periodic Benefit Expense
The following table shows the components of net periodic benefit income:

 
 
Three Months Ended
June 30,
 
Six Months Ended
June 30,
(In thousands)
 
2016
 
2015
 
2016
 
2015
Service cost
 
$
1,264

 
$
1,342

 
$
2,528

 
$
2,684

Interest cost
 
1,217

 
1,174

 
2,434

 
2,348

Expected return on plan assets
 
(2,737
)
 
(2,855
)
 
(5,474
)
 
(5,710
)
Amortization of prior service cost
 
—

 
4

 
—

 
8

Recognized net actuarial loss
 
193

 
159

 
386

 
318

Net periodic benefit income
 
$
(63
)
 
$
(176
)
 
$
(126
)
 
$
(352
)