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

  
Three Months Ended
September 30,
  
Nine Months Ended
September 30,
 
  
2014
  
2013
  
2014
  
2013
 
         
Service cost-benefits earned during period
 
$
31
  
$
46
  
$
93
  
$
100
 
Interest cost on projected benefit obligations
  
954
   
899
   
2,862
   
2,653
 
Expected return on plan assets
  
(1,214
)
  
(1,225
)
  
(3,642
)
  
(3,711
)
Amortization of prior service costs
  
53
   
53
   
157
   
157
 
Amortization of actuarial loss
  
79
   
417
   
237
   
1,273
 
Net pension costs
 
$
(97
)
 
$
190
  
$
(293
)
 
$
472