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Workers' Compensation (Tables)
3 Months Ended
Mar. 31, 2013
Workers' Compensation [Abstract]  
Summarizes aggregate workers' compensation reserve activity

The following table summarizes the aggregate workers’ compensation reserve activity (in thousands):

 

                 
    Three Months Ended
March 31,
 
    2013     2012  

Beginning balance

               

Workers’ compensation claims liabilities

  $ 70,564     $ 51,193  

Add: claims expense accrual:

               

Current period

    12,677       8,163  

Prior periods

    3,452       0  
   

 

 

   

 

 

 

Total expense accrual

    16,129       8,163  
   

 

 

   

 

 

 

Less: claim payments related to:

               

Current period

    426       279  

Prior periods

    9,055       6,283  
   

 

 

   

 

 

 

Total paid

    9,481       6,562  
   

 

 

   

 

 

 

Ending balance

               

Workers’ compensation claims liabilities

  $ 77,212     $ 52,794  
   

 

 

   

 

 

 

Incurred but not reported (IBNR)

  $ 51,838     $ 38,280