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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Advance Royalties (Details) - USD ($) $ in Thousands | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Advance Royalties |  |
Advance royalties, affiliates | $ 55,613 | $ 48,389
Advance royalties, third-parties | 12,869 | 12,570
Total advance royalties, net | $ 68,482 | $ 60,959

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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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- References No definition available. + Details
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