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Retirement Plans (Tables)
 6 Months Ended
Jun. 30, 2013
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)
 
2013
  
2012
  
2013
  
2012
 
 
 
  
  
  
 
Service cost
 
$
755
  
$
635
  
$
1,513
  
$
1,271
 
Interest cost
  
600
   
675
   
1,204
   
1,352
 
Expected return on plan assets
  
(362
)
  
(358
)
  
(727
)
  
(717
)
Amortization of prior service cost
  
43
   
493
   
86
   
986
 
Amortization of actuarial loss
  
799
   
188
   
1,599
   
377
 
 
                
Defined benefit expense
 
$
1,835
  
$
1,633
  
$
3,675
  
$
3,269