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Retirement Plans (Tables)
 3 Months Ended
Mar. 31, 2018
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
March 31,
 
       
(In thousands)
 
2018
  
2017
 
       
Service cost
 
$
368
  
$
461
 
Interest cost
  
289
   
355
 
Expected return on plan assets
  
(245
)
  
(255
)
Amortization of actuarial gain
  
(27
)
  
(21
)
         
Total defined benefit expense
 
$
385
  
$
540