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WORKERS' COMPENSATION AND PNEUMOCONIOSIS | 3 Months Ended
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Mar. 31, 2021
WORKERS' COMPENSATION AND PNEUMOCONIOSIS BENEFITS |
WORKERS' COMPENSATION AND PNEUMOCONIOSIS | 13.WORKERS' COMPENSATION AND PNEUMOCONIOSIS ​ The changes in the workers' compensation liability, including current and long-term liability balances, for each of the periods presented were as follows: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | Three Months Ended |
​ | ​ | March 31, | ​
​ | ​ | 2021 |  | 2020 | ​
​ | ​ | (in thousands) | ​
Beginning balance | ​ | $ | 54,739 | ​ | $ | 53,384 | ​
Accruals increase | ​ |  | 1,672 | ​ |  | 1,748 | ​
Payments | ​ |  | (2,410) | ​ |  | (2,571) | ​
Interest accretion | ​ |  | 232 | ​ |  | 319 | ​
Ending balance | ​ | $ | 54,233 | ​ | $ | 52,880 | ​
​ We limit our exposure to traumatic injury claims by purchasing a high deductible insurance policy that starts paying benefits after deductibles for a claim have been met. The deductible level may vary by claim year. Our workers' compensation liability above is presented on a gross basis and does not include our expected receivables on our insurance policy. Our receivables for traumatic injury claims under this policy as of March 31, 2021 are $7.1 million and are included in Other long-term assets on our condensed consolidated balance sheet. ​ Certain of our mine operating entities are liable under state statutes and the Federal Coal Mine Health and Safety Act of 1969, as amended, to pay pneumoconiosis, or black lung, benefits to eligible employees and former employees and their dependents. Components of the net periodic benefit cost for each of the periods presented are as follows: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | Three Months Ended | ​
​ | ​ | March 31, | ​
​ | ​ | 2021 |  | 2020 |
​ | ​ | (in thousands) | ​
Service cost | ​ | $ | 1,031 | ​ | $ | 878 |
Interest cost (1) | ​ |  | 636 | ​ |  | 750 | ​
Net amortization (1) | ​ |  | 1,043 | ​ |  | (172) | ​
Net periodic benefit cost | ​ | $ | 2,710 | ​ | $ | 1,456 | ​
(1) | Interest cost and net amortization are included in the Other expense line item within our condensed consolidated statements of income.

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- Definition Represents the entire disclosure for workers' compensation and pneumoconiosis benefits. + References No definition available. + Details
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