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Workers' Compensation (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Summarizes aggregate workers' compensation reserve activity        
Workers' compensation claims liabilities, Beginning balance $ 52,794 $ 39,783 $ 51,193 $ 39,301
Add: claims expense accrual:        
Current period 8,170 5,279 16,333 9,985
Prior periods 3,110 286 3,110 522
Total expense accrual 11,280 5,565 19,443 10,507
Less: claim payments related to:        
Current period 1,304 962 1,583 1,219
Prior periods 7,005 3,390 13,288 7,593
Total paid 8,309 4,352 14,871 8,812
Workers' compensation claims liabilities, Ending balance 55,765 40,996 55,765 40,996
Incurred but not reported (IBNR) $ 41,000 $ 29,738 $ 41,000 $ 29,738