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Self-Insurance Accruals
 12 Months Ended
Dec. 31, 2012
Self-Insurance Accruals [Abstract]  
Self-Insurance Accruals
Self-Insurance Accruals

Components of our self-insurance accruals for workers’ compensation, vehicle liability and general liability follow:
 
December 31,
 
2012
 
2011
Workers' compensation
$
40,450

 
$
33,355

Present value discount
2,003

 
1,756

 
38,447

 
31,599

Vehicle liability
5,117

 
6,544

General liability
18,169

 
19,122

Total
61,733

 
57,265

Less current portion
20,115

 
26,793

Noncurrent portion
$
41,618

 
$
30,472


 
The changes in our self-insurance accruals and the discount rate used for the workers’ compensation accrual are summarized in the table below.
 
December 31,
 
2012
 
2011
Balance, beginning of year
$
57,265

 
$
54,410

Provision for claims
29,590

 
29,931

Payment of claims
25,122

 
27,076

Balance, end of year
$
61,733

 
$
57,265

Workers' compensation discount rate
1.90
%
 
2.50
%