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Workers' Compensation Claims (Tables)
 12 Months Ended
Dec. 31, 2012
Workers Compensation Claims [Abstract]  
Summarizes aggregate workers' compensation reserve activity

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

 

                         
    Year Ended December 31,  
    2012     2011     2010  

Balance at January 1,

                        

Workers’ compensation claims liabilities

   $ 51,193     $ 39,302     $ 35,958  

Claims expense accrual:

                        

Current year

     38,386       26,161       16,850  

Prior years

     12,352       9,978       880  
   

 

 

    

 

 

    

 

 

  
      50,738       36,139       17,730  
   

 

 

    

 

 

    

 

 

  

Claims payments related to:

                        

Current year

     6,746       5,565       3,814  

Prior years

     24,613       18,683       10,572  
   

 

 

    

 

 

    

 

 

  
      31,359       24,248       14,386  
   

 

 

    

 

 

    

 

 

  

Balance at December 31,

                        

Workers’ compensation claims liabilities

   $ 70,564     $ 51,193     $ 39,302  
   

 

 

    

 

 

    

 

 

  

Incurred but not reported (IBNR)

   $ 47,992     $ 37,335     $ 27,163