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Defined Benefit Plan (Tables)
3 Months Ended
Mar. 31, 2013
Defined Benefit Plan [Abstract]  
Components of net periodic benefit cost
Components of Net Periodic Benefit Cost

   
Pension Benefits
 
   
Three Months Ended March,
 
   
2013
  
2012
 
Service cost
 $149  $117 
Interest cost
  154   185 
Expected return on plan assets
  (246)  (269)
Amortization of prior service cost
  (25)  (25)
Recognized net actuarial loss
  133   127 
Net Periodic Benefit Cost
 $165  $135