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Pension Plans (Tables)
9 Months Ended
Sep. 30, 2013
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,
 
 
 
2013
  
2012
  
2013
  
2012
 
 
 
  
  
  
 
Service cost-benefits earned during period
 
$
46
  
$
11
  
$
100
  
$
73
 
Interest cost on projected benefit obligations
  
899
   
940
   
2,653
   
2,826
 
Expected return on plan assets
  
(1,225
)
  
(1,119
)
  
(3,711
)
  
(3,355
)
Amortization of prior service costs
  
53
   
53
   
157
   
157
 
Amortization of actuarial loss
  
417
   
425
   
1,273
   
1,405
 
 
                
Net pension costs
 
$
190
  
$
310
  
$
472
  
$
1,106