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Retirement Plans (Tables)
 6 Months Ended
Jun. 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
June 30,
  
Six Months Ended
June 30,
 
(In thousands)
 
2017
  
2016
  
2017
  
2016
 
             
Service cost
 
$
465
  
$
503
  
$
926
  
$
1,006
 
Interest cost
  
359
   
425
   
714
   
845
 
Expected return on plan assets
  
(259
)
  
(300
)
  
(514
)
  
(597
)
Amortization of actuarial (gain) loss
  
(21
)
  
55
   
(42
)
  
108
 
Settlement expense
  
3,797
   
-
   
3,797
   
-
 
                 
Total defined benefit expense
 
$
4,341
  
$
683
  
$
4,881
  
$
1,362