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Retirement Plans (Tables)
 9 Months Ended
Sep. 30, 2017
Retirement Plans [Abstract]  
Components of Annual Benefit Cost
The Company’s components of annual benefit cost for the defined benefit plans for the periods presented are as follows:

  
Three Months Ended
September 30,
  
Nine Months Ended
September 30,
 
(In thousands)
 
2017
  
2016
  
2017
  
2016
 
             
Service cost
 
$
466
  
$
502
  
$
1,392
  
$
1,508
 
Interest cost
  
366
   
414
   
1,080
   
1,259
 
Expected return on plan assets
  
(264
)
  
(286
)
  
(778
)
  
(883
)
Amortization of actuarial (gain) loss
  
(19
)
  
54
   
(61
)
  
162
 
Settlement expense
  
-
   
-
   
3,797
   
-
 
                 
Total defined benefit expense
 
$
549
  
$
684
  
$
5,430
  
$
2,046