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ACCRUED WORKERS' COMPENSATION AND PNEUMOCONIOSIS BENEFITS - Workers' Compensation Liability (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Reconciliation of changes in the workers' compensation liability
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
Estimated present value of future obligations and other information
Workers' compensation discount rate	1.95%	2.81%
Letters of credit outstanding to secure workers compensation obligations	$ 95,200	$ 90,200
Other long-term assets
Estimated present value of future obligations and other information
Receivables for traumatic injury claims	$ 7,100	$ 7,700

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- Definition

Amount of letters of credit and other surety bonds that are available for the future payment of workers' compensation obligations.

+ References

No definition available.

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- Definition

Represents the change in the liability for workers' compensation due to payments made during the period.

+ References

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- Definition

Represents the change in the liability for workers' compensation due to an adjustment for valuation gain or loss.

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Represents the change in the liability for workers' compensation due to additional amounts accrued during the period.

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Amount recognized for the passage of time, typically for liabilities, that have been discounted to their net present values. Excludes accretion associated with asset retirement obligations.

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Carrying amount due after one year of the balance sheet date (or one operating cycle, if longer) of amount due in settlement of a claim for reimbursement from an insurance company when the Company has suffered a loss covered under an insurance policy.

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Percent discount applied to worker's compensation reserve liability to reduce the reserve to present value.

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Carrying value as of the balance sheet date of obligations and payables pertaining to claims incurred of a workers compensation nature.

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