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Defined Benefit Plan (Tables)
9 Months Ended
Sep. 30, 2012
Defined Benefit Plan [Abstract]  
Components of net periodic benefit cost
Components of Net Periodic Benefit Cost

   
Pension Benefits
 
   
Nine Months Ended September 30,
 
   
2012
  
2011
 
Service cost
 $351  $327 
Interest cost
  555   528 
Expected return on plan assets
  (807)  (609)
Amortization of prior service cost
  (75)  (75)
Recognized net actuarial loss
  381   219 
Net Periodic Benefit Cost
 $405  $390