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Retirement Plans (Tables)
 6 Months Ended
Jun. 30, 2021
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
June 30,
    
Six Months Ended
June 30,
  
(In thousands)
  
2021
    
2020
    
2021
    
2020
  
Service cost
  
$
437
    
$
396
    
$
873
    
$
796
  
Interest cost
    
214
      
251
      
426
      
507
  
Expected return on plan assets
    
(185
)
    
(204
)
    
(369
)
    
(413
)
Recognized actuarial loss
    
69
      
15
      
138
      
31
  
Total defined benefit expense
  
$
535
    
$
458
    
$
1,068
    
$
921