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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Additional Information (Details) | 12 Months Ended
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Dec. 31, 2022
Income Taxes |
Percentage of qualifying income for tax purposes | 90.00%
Minimum |
Revenue Recognition |
Coal shipments, payment period | 14 days
Maximum |
Revenue Recognition |
Coal shipments, payment period | 28 days
Defined benefit pension plan |
Employee Benefit Plans |
Threshold for amortization of unrecognized actuarial gains and losses (as a percent) | 10.00%

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- Definition Unrecognized actuarial gains and losses as a percentage of the greater of the benefit obligation or the market-related value of plan assets, above which such gains and losses are amortized over the participants' average remaining future years of service. + References No definition available. + Details
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