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ACCRUED WORKERS' COMPENSATION AND PNEUMOCONIOSIS BENEFITS (Tables) | 12 Months Ended
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Dec. 31, 2020
Accrued Workers Compensation And Pneumoconiosis Benefits |
Reconciliation of changes in workers' compensation liability | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | December 31, | ​
​ | ​ | 2020 |  | 2019 | ​
​ | ​ | (in thousands) | ​
Beginning balance | ​ | $ | 53,384 | ​ | $ | 49,539 | ​
Accruals increase | ​ |  | 5,146 | ​ |  | 7,162 | ​
Payments | ​ |  | (8,482) | ​ |  | (11,320) | ​
Interest accretion | ​ |  | 1,278 | ​ |  | 1,606 | ​
Valuation loss | ​ |  | 3,413 | ​ |  | 6,397 | ​
Ending balance | ​ | $ | 54,739 | ​ | $ | 53,384 | ​
Reconciliation of changes in pneumoconiosis benefit obligation | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | December 31,
​ | ​ | 2020 |  | 2019 | ​
​ | ​ | (in thousands) | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Benefit obligations at beginning of year | ​ | $ | 97,683 | ​ | $ | 72,095 | ​
Service cost | ​ |  | 3,526 | ​ |  | 2,593 | ​
Interest cost | ​ |  | 2,998 | ​ |  | 3,044 | ​
Actuarial (gain) loss | ​ |  | 7,787 | ​ |  | 23,298 | ​
Benefits and expenses paid | ​ |  | (3,498) | ​ |  | (3,347) | ​
Benefit obligations at end of year | ​ | $ | 108,496 | ​ | $ | 97,683 | ​
Components of pneumoconiosis and workers' compensation expense | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Year Ended December 31, |
​ |  | 2020 |  | 2019 |  | 2018 | ​
​ | ​ | (in thousands) | ​
Black lung benefits: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Service cost |  | $ | 3,526 | ​ | $ | 2,593 | ​ | $ | 2,525 | ​
Interest cost (1) | ​ |  | 2,998 | ​ |  | 3,044 | ​ |  | 2,542 | ​
Net amortization (1) | ​ |  | (686) | ​ |  | (4,582) | ​ |  | 2 | ​
Total pneumoconiosis expense | ​ |  | 5,838 | ​ |  | 1,055 | ​ |  | 5,069 | ​
Workers' compensation expense | ​ |  | 12,305 | ​ |  | 17,541 | ​ |  | 11,270 | ​
Net periodic benefit cost | ​ | $ | 18,143 | ​ | $ | 18,596 | ​ | $ | 16,339 | ​
________________________________________
| (1) | Interest cost and net amortization is included in the Other income (expense) line item within our consolidated statements of income (see Note 2 – Summary of Significant Accounting Policies).
Pneumoconiosis benefits |
Accrued Workers Compensation And Pneumoconiosis Benefits |
Reconciliation of changes in the pneumoconiosis benefit obligation recognized in AOCI | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | Year Ended December 31,
​ | ​ | 2020 |  | 2019 |  | 2018 |
​ | ​ | (in thousands) | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Net actuarial gain (loss) | ​ | $ | (7,787) | ​ | $ | (23,298) | ​ | $ | 4,599 | ​
Reversal of amortization item: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Net actuarial (gain) loss | ​ |  | (686) | ​ |  | (4,582) | ​ |  | 2 | ​
Total recognized in accumulated other comprehensive loss | ​ | $ | (8,473) | ​ | $ | (27,880) | ​ | $ | 4,601 | ​
Schedule of amount recognized in accumulated other comprehensive income | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | Year Ended December 31,
​ | ​ | 2020 |  | 2019 |  | 2018 |
​ | ​ | (in thousands) | ​
Amount recognized in accumulated other comprehensive loss consists of: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Net actuarial loss | ​ | $ | 40,399 | ​ | $ | 31,927 | ​ | $ | 4,047 | ​
Summary of information about amounts recognized in the consolidated balance sheets | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | December 31,
​ | ​ | 2020 |  | 2019 |
​ | ​ | (in thousands) | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Workers’ compensation claims | ​ | $ | 54,739 | ​ | $ | 53,384 | ​
Pneumoconiosis benefit claims | ​ | ​ | 108,496 | ​ | ​ | 97,683 | ​
Total obligations | ​ |  | 163,235 | ​ |  | 151,067 | ​
Less current portion | ​ |  | (10,646) | ​ |  | (11,175) | ​
Non-current obligations | ​ | $ | 152,589 | ​ | $ | 139,892 | ​

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