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Workers' Compensation Claims (Tables) | 12 Months Ended
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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 |

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- Definition Workers compensation reserve activity. + References No definition available. + Details
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