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Pension Plans (Tables)
6 Months Ended
Jun. 30, 2014
Pension Plans [Abstract]  
Net Pension Costs
Net pension costs included the following components (in thousands):

 
 
Three Months Ended
June 30,
  
Six Months Ended
June 30,
 
 
 
2014
  
2013
  
2014
  
2013
 
 
 
  
  
  
 
Service cost-benefits earned during period
 
$
31
  
$
27
  
$
62
  
$
54
 
Interest cost on projected benefit obligations
  
954
   
877
   
1,908
   
1,754
 
Expected return on plan assets
  
(1,214
)
  
(1,243
)
  
(2,428
)
  
(2,486
)
Amortization of prior service costs
  
52
   
52
   
104
   
104
 
Amortization of actuarial loss
  
79
   
428
   
158
   
856
 
 
                
Net pension costs
 
$
(98
)
 
$
141
  
$
(196
)
 
$
282