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Retirement Plans (Tables)
 9 Months Ended
Sep. 30, 2018
Retirement Plans [Abstract]  
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)
 
2018
  
2017
  
2018
  
2017
 
             
Service cost
 
$
366
  
$
466
  
$
1,100
  
$
1,392
 
Interest cost
  
282
   
366
   
857
   
1,080
 
Expected return on plan assets
  
(236
)
  
(264
)
  
(722
)
  
(778
)
Amortization of actuarial gain
  
(27
)
  
(19
)
  
(81
)
  
(61
)
Settlement expense
  
-
   
-
   
-
   
3,797
 
                 
Total defined benefit expense
 
$
385
  
$
549
  
$
1,154
  
$
5,430