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Pension Plans (Tables)
3 Months Ended
Mar. 31, 2014
Pension Plans [Abstract]  
Net Pension Costs
Net pension costs included the following components (in thousands):

   
Three Months Ended
March 31,
 
   
2014
  
2013
 
        
Service cost-benefits earned during period
 $31  $27 
Interest cost on projected benefit obligations
  954   877 
Expected return on plan assets
  (1,214 )  (1,243 )
Amortization of prior service costs
  52   52 
Amortization of actuarial loss
  79   428 
          
Net pension costs
 $(98) $141