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WORKERS' COMPENSATION AND PNEUMOCONIOSIS - Workers' Comp (Detail) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Sep. 30, 2023 | Sep. 30, 2022 | Jun. 30, 2022 | Sep. 30, 2023 | Sep. 30, 2022 | Dec. 31, 2021
Reconciliation of changes in the workers' compensation liability |  |  |  |  |  |
Beginning balance | $ 51,108 | $ 47,221 | $ 53,448 | $ 49,452 | $ 53,448 |
Changes in accruals | 3,001 | 2,918 |  | 9,071 | 7,464 |
Payments | (3,503) | (2,856) |  | (10,008) | (8,938) |
Interest accretion | 551 | 287 |  | 1,652 | 861 |
Valuation loss (gain) |  |  |  | 990 | (5,265) |
Ending balance | 51,157 | $ 47,570 | $ 47,221 | 51,157 | $ 47,570 | $ 53,448
Estimated present value of future obligations and other information |  |  |  |  |  |
Workers' compensation discount rate |  |  | 4.22% |  |  | 2.41%
Other long-term assets |  |  |  |  |  |
Estimated present value of future obligations and other information |  |  |  |  |  |
Receivables for traumatic injury claims | $ 4,100 |  |  | $ 4,100 |  |

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