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Accounting Policies (Tables)
 3 Months Ended
Mar. 31, 2013
Accounting Policies [Abstract]  
Activity and balances related to incurred but not paid workers' compensation claims
The following table provides the activity and balances related to incurred but not paid workers' compensation claims:

 
Three Months Ended March 31,
 
 
2013
 
 
2012
 
 
(in thousands)
 
 
 
 
 
 
 
Beginning balance, January 1,                                                           
 
$
111,685
 
 
$
104,791
 
Accrued claims                                                           
 
 
9,134
 
 
 
9,495
 
Present value discount                                                           
 
 
(160
)
 
 
(347
)
Paid claims                                                           
 
 
(7,583
)
 
 
(6,976
)
Ending balance                                                           
 
$
113,076
 
 
$
106,963
 
 
 
 
 
 
 
 
 
Current portion of accrued claims                                                           
 
$
47,374
 
 
$
45,068
 
Long-term portion of accrued claims                                                           
 
 
65,702
 
 
 
61,895
 
 
$
113,076
 
 
$
106,963