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ACCRUED WORKERS' COMPENSATION AND PNEUMOCONIOSIS BENEFITS (Tables) | 12 Months Ended
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Dec. 31, 2023
Black lung benefits: |
Reconciliation of changes in workers' compensation liability | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | December 31, | ​
​ | ​ | 2023 |  | 2022 | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Beginning balance | ​ | $ | 49,452 | ​ | $ | 53,448 | ​
Changes in accruals | ​ |  | 12,155 | ​ |  | 7,384 | ​
Payments | ​ |  | (14,438) | ​ |  | (12,708) | ​
Interest accretion | ​ |  | 2,202 | ​ |  | 1,147 | ​
Valuation loss (gain) | ​ |  | (1,396) | ​ |  | 181 | ​
Ending balance | ​ | $ | 47,975 | ​ | $ | 49,452 | ​
Reconciliation of changes in pneumoconiosis benefit obligation | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | December 31,
​ | ​ | 2023 |  | 2022 | ​
​ | ​ | (in thousands) | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Benefit obligations at beginning of year | ​ | $ | 104,287 | ​ | $ | 111,316 | ​
Service cost | ​ |  | 2,698 | ​ |  | 3,798 | ​
Interest cost | ​ |  | 4,951 | ​ |  | 2,991 | ​
Actuarial loss (gain) | ​ |  | 25,615 | ​ |  | (9,840) | ​
Benefits and expenses paid | ​ |  | (5,107) | ​ |  | (3,978) | ​
Benefit obligations at end of year | ​ | $ | 132,444 | ​ | $ | 104,287 | ​
Components of pneumoconiosis and workers' compensation expense |
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Year Ended December 31, |
​ |  | 2023 |  | 2022 |  | 2021 | ​
​ | ​ | (in thousands) | ​
Black lung benefits: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Service cost |  | $ | 2,698 | ​ | $ | 3,798 | ​ | $ | 4,021 | ​
Interest cost (1) | ​ |  | 4,951 | ​ |  | 2,991 | ​ |  | 2,545 | ​
Net amortization (1) | ​ |  | 1,382 | ​ |  | 1,038 | ​ |  | 4,172 | ​
Total pneumoconiosis expense | ​ |  | 9,031 | ​ |  | 7,827 | ​ |  | 10,738 | ​
Workers' compensation expense | ​ |  | 15,152 | ​ |  | 11,675 | ​ |  | 8,339 | ​
Net periodic benefit cost | ​ | $ | 24,183 | ​ | $ | 19,502 | ​ | $ | 19,077 | ​
________________________________________
(1) | Interest cost and net amortization is included in the Other income line item within our consolidated statements of income.
Pneumoconiosis benefits |
Black lung benefits: |
Reconciliation of changes in the pneumoconiosis benefit obligation recognized in AOCI | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | Year Ended December 31,
​ | ​ | 2023 |  | 2022 |  | 2021 |
​ | ​ | (in thousands) | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Net actuarial gain (loss) | ​ | $ | (25,615) | ​ | $ | 9,840 | ​ | $ | (161) | ​
Reversal of amortization item: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Net actuarial loss | ​ |  | 1,382 | ​ |  | 1,038 | ​ |  | 4,172 | ​
Total recognized in accumulated other comprehensive loss | ​ | $ | (24,233) | ​ | $ | 10,878 | ​ | $ | 4,011 | ​
Schedule of amount recognized in accumulated other comprehensive income | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | Year Ended December 31,
​ | ​ | 2023 |  | 2022 |  | 2021 |
​ | ​ | (in thousands) | ​
Amount recognized in accumulated other comprehensive loss consists of: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Net actuarial loss | ​ | $ | 49,745 | ​ | $ | 25,510 | ​ | $ | 36,388 | ​
Summary of information about amounts recognized in the consolidated balance sheets | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | December 31,
​ | ​ | 2023 |  | 2022 |
​ | ​ | (in thousands) | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Workers' compensation claims | ​ | $ | 47,975 | ​ | $ | 49,452 | ​
Pneumoconiosis benefit claims | ​ | ​ | 132,444 | ​ | ​ | 104,287 | ​
Total obligations | ​ |  | 180,419 | ​ |  | 153,739 | ​
Less current portion | ​ |  | (15,913) | ​ |  | (14,099) | ​
Non-current obligations | ​ | $ | 164,506 | ​ | $ | 139,640 | ​

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