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Pension Plan (Tables)
 9 Months Ended
Sep. 30, 2017
Defined Benefit Plan [Abstract]  
Components Of Net Periodic Benefit Expense
The following table shows the components of net periodic benefit income:

 
 
Three Months Ended
September 30,
 
Nine Months Ended
September 30,
(In thousands)
 
2017
 
2016
 
2017
 
2016
Service cost
 
$
1,317

 
$
1,264

 
$
3,951

 
$
3,792

Interest cost
 
1,271

 
1,217

 
3,813

 
3,651

Expected return on plan assets
 
(2,863
)
 
(2,737
)
 
(8,589
)
 
(8,211
)
Amortization of prior service cost
 
—

 
—

 
—

 
—

Recognized net actuarial loss
 
144

 
193

 
432

 
579

Net periodic benefit income
 
$
(131
)
 
$
(63
)
 
$
(393
)
 
$
(189
)