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Workers' Compensation Claims (Tables) | 12 Months Ended
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Dec. 31, 2017
Text Block [Abstract] |
Summarizes Aggregate Workers' Compensation Reserve Activity | The following table summarizes the aggregate workers' compensation reserve activity (in thousands):
|  |  | Years Ended December 31, |
|  |  | 2017 |  |  | 2016 |  |  | 2015 |
Beginning balance |  |  |  |  |  |  |  |  |  |  |  |  |
Workers' compensation claims liabilities |  |  | $ | 312,537 |  |  | $ | 255,675 |  |  | $ | 225,278 |
Add: claims expense accrual |  |  |  |  |  |  |  |  |  |  |  |  |
Current period |  |  |  | 154,091 |  |  |  | 137,852 |  |  |  | 122,740 |
Prior periods |  |  |  | 5,159 |  |  |  | (301 | ) |  |  | (13,683 | )
|  |  |  | 159,250 |  |  |  | 137,551 |  |  |  | 109,057 |
Less: claim payments related to |  |  |  |  |  |  |  |  |  |  |  |  |
Current period |  |  |  | 19,537 |  |  |  | 20,180 |  |  |  | 17,517 |
Prior periods |  |  |  | 82,573 |  |  |  | 69,626 |  |  |  | 61,143 |
|  |  |  | 102,110 |  |  |  | 89,806 |  |  |  | 78,660 |
Add: change in claims incurred in excess of retention limits |  |  |  | (6,160 | ) |  |  | 9,117 |  |  |  | — |
Ending balance |  |  |  |  |  |  |  |  |  |  |  |  |
Workers' compensation claims liabilities |  |  | $ | 363,517 |  |  | $ | 312,537 |  |  | $ | 255,675 |
Incurred but not reported (IBNR) |  |  | $ | 202,227 |  |  | $ | 158,169 |  |  | $ | 127,792 |
Ratio of IBNR to workers' compensation claims liabilities |  |  |  | 56 | % |  |  | 51 | % |  |  | 50 | %

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