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Employee Benefits (Tables)
6 Months Ended
Jun. 30, 2013
Employee Benefits [Abstract]  
Components of net periodic benefit cost for defined benefit plans and postretirement benefit plans
The components of net periodic benefit cost (credit) for our defined benefit plans and postretirement benefit plans for the three months and six months ended June 30, 2013 and 2012 were as follows (in thousands):

 
 
Three Months Ended
  
Six Months Ended
 
 
 
June 30,
  
June 30,
 
Pension benefits
 
2013
  
2012
  
2013
  
2012
 
Service cost
 
$
45
  
$
32
  
$
90
  
$
65
 
Interest cost
  
58
   
46
   
117
   
93
 
Amortization of prior service cost
  
7
   
27
   
14
   
55
 
Actuarial net loss
  
171
   
66
   
345
   
131
 
Net periodic benefit cost
 
$
281
  
$
171
  
$
566
  
$
344
 
 
                
Postretirement benefits
                
Service cost
 
$
  
$
1
  
$
1
  
$
2
 
Interest cost
  
10
   
18
   
19
   
43
 
Amortization of prior service cost
  
(1,087
)
  
(1,223
)
  
(2,174
)
  
(2,447
)
Actuarial net loss
  
605
   
769
   
1,216
   
1,417
 
Net periodic benefit credit
 
$
(472
)
 
$
(435
)
 
$
(938
)
 
$
(985
)