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Retirement Plans (Tables)
 6 Months Ended
Jun. 30, 2015
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)
 
2015
  
2014
  
2015
  
2014
 
         
Service cost
 
$
661
  
$
635
  
$
1,323
  
$
1,267
 
Interest cost
  
473
   
603
   
945
   
1,202
 
Expected return on plan assets
  
(324
)
  
(480
)
  
(646
)
  
(954
)
Amortization of prior service cost
  
-
   
43
   
-
   
86
 
Amortization of actuarial loss (gain)
  
74
   
(157
)
  
147
   
(317
)
Curtailment gain
  
-
   
(115
)
  
-
   
(115
)
                 
Total defined benefit expense
 
$
884
  
$
529
  
$
1,769
  
$
1,169