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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Advance Royalties (Details) - USD ($) $ in Thousands | Dec. 31, 2023 | Dec. 31, 2022
--- | --- | ---
Advance Royalties |  |
Advance royalties, affiliates | $ 64,599 | $ 60,608
Advance royalties, third-parties | 14,306 | 14,661
Total advance royalties, net | $ 78,905 | $ 75,269

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- Definition Carrying amount as of the balance sheet date of capitalized amounts paid for coal mineral royalties. + References No definition available. + Details
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- Definition Carrying amount as of the balance sheet date of capitalized amounts paid to affiliates for coal mineral royalties. + References No definition available. + Details
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- Definition Carrying amount as of the balance sheet date of capitalized amounts paid to third parties for coal mineral royalties. + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- References No definition available. + Details
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