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Workers' Compensation Claims (Tables) | 9 Months Ended
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Sep. 30, 2020
Text Block [Abstract] |
Summarizes Aggregate Workers' Compensation Reserve Activity | The following table summarizes the aggregate workers’ compensation reserve activity (in thousands):
| Three Months Ended |  |  | Nine Months Ended |
| September 30, |  |  | September 30, |
| 2020 |  |  | 2019 |  |  | 2020 |  |  | 2019 |
Beginning balance |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Workers' compensation claims liabilities | $ | 336,504 |  |  | $ | 430,736 |  |  | $ | 438,986 |  |  | $ | 413,397 |
Add: claims expense accrual |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Current period |  | 35,138 |  |  |  | 37,404 |  |  |  | 106,359 |  |  |  | 118,934 |
Prior periods |  | (2,977 | ) |  |  | (5,593 | ) |  |  | (5,163 | ) |  |  | (10,245 | )
|  | 32,161 |  |  |  | 31,811 |  |  |  | 101,196 |  |  |  | 108,689 |
Less: claim payments related to |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Current period |  | 7,046 |  |  |  | 8,609 |  |  |  | 13,123 |  |  |  | 14,213 |
Prior periods |  | 15,640 |  |  |  | 23,815 |  |  |  | 181,170 |  |  |  | 77,619 |
|  | 22,686 |  |  |  | 32,424 |  |  |  | 194,293 |  |  |  | 91,832 |
Change in claims incurred in excess of retention limits |  | 1,369 |  |  |  | (77 | ) |  |  | 1,459 |  |  |  | (208 | )
Ending balance |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Workers' compensation claims liabilities | $ | 347,348 |  |  | $ | 430,046 |  |  | $ | 347,348 |  |  | $ | 430,046 |
Incurred but not reported (IBNR) | $ | 203,595 |  |  | $ | 274,344 |  |  | $ | 203,595 |  |  | $ | 274,344 |
Ratio of IBNR to workers' compensation claims liabilities |  | 59 | % |  |  | 64 | % |  |  | 59 | % |  |  | 64 | %

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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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Namespace Prefix: | us-gaap_
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Period Type: | duration