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ACCRUED WORKERS' COMPENSATION AND PNEUMOCONIOSIS BENEFITS - Workers' Compensation Liability (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020
Reconciliation of changes in the workers' compensation liability |  |
Beginning balance | $ 54,739 | $ 53,384
Accruals increase | 5,168 | 5,146
Payments | (10,725) | (8,482)
Interest accretion | 926 | 1,278
Valuation loss | 3,340 | 3,413
Ending balance | $ 53,448 | $ 54,739
Estimated present value of future obligations and other information |  |
Workers' compensation discount rate | 2.41% | 1.95%
Letters of credit outstanding to secure workers compensation obligations | $ 100,400 | $ 95,200
Other long-term assets |  |
Estimated present value of future obligations and other information |  |
Receivables for traumatic injury claims | $ 5,700 | $ 7,100

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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. + Details
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- Definition Represents the change in the liability for workers' compensation due to payments made during the period. + References No definition available. + Details
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- Definition Represents the change in the liability for workers' compensation due to an adjustment for valuation gain or loss. + References No definition available. + Details
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- Definition 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. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b)(2) -URI http://asc.fasb.org/extlink&oid=6394359&loc=d3e17939-110869 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6392676&loc=d3e7480-110848 Reference 3: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section 35 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6394232&loc=d3e17558-110866 + Details
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- Definition 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. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.17) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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