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RELATED-PARTY TRANSACTIONS - Affiliate Royalty Agreements - Craft Foundations (Details) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Tunnel Ridge |  |  |  |
Related Party Transaction |  |  |  |
Payments for earned royalties | $ 5.8 | $ 6.1 | $ 7.2 |
Tunnel Ridge |  |  |  |
Related Party Transaction |  |  |  |
Annual minimum coal royalties | $ 3.0 |  |  |
Tunnel Ridge | Joseph W Craft III Foundation | Tunnel Ridge |  |  |  |
Related Party Transaction |  |  |  |
Property ownership (as a percent) |  |  |  | 50.00%
Tunnel Ridge | Kathleen S Craft Foundation | Tunnel Ridge |  |  |  |
Related Party Transaction |  |  |  |
Property ownership (as a percent) |  |  |  | 50.00%

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- Definition The minimum amount of coal royalties to be paid annually to the related party, per the terms of the agreement. + References No definition available. + Details
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- Definition Represents the property ownership, as a percent. + References No definition available. + Details
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- Definition The amount of cash paid for royalties during the current period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 25 -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=123570139&loc=d3e3536-108585 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Details
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- Details
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- Details
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- Details
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