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RELATED-PARTY TRANSACTIONS - Craft Foundations (Details) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2018
Tunnel Ridge |  |  |  |
Related Party Transaction |  |  |  |
Related party purchase | $ 0.2 |  |  |
Tunnel Ridge |  |  |  |
Related Party Transaction |  |  |  |
Annual minimum coal royalties | 3.0 |  |  |
Payments for earned royalties | $ 12.1 | $ 12.3 | $ 5.8 |
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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