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RELATED-PARTY TRANSACTIONS - Affiliate Royalty Agreements (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Related Party Transaction |  |  |
As of the beginning of period | $ 64,599 |  |
As of the end of period | 67,189 | $ 64,599 |
Coal lease |  |  |
Related Party Transaction |  |  |
As of the beginning of period | 64,599 | 60,608 | $ 55,613
Payments | 11,249 | 11,249 | 11,250
Recoupment | (8,659) | (7,258) | (6,255)
As of the end of period | 67,189 | 64,599 | 60,608
Tunnel Ridge |  |  |
Related Party Transaction |  |  |
As of the beginning of period | 1,500 | 1,500 | 1,500
Payments | 3,000 | 3,000 | 3,000
Recoupment | (3,000) | (3,000) | (3,000)
As of the end of period | 1,500 | 1,500 | 1,500
WKY CoalPlay | December 2014 coal lease - Henderson and Union Counties, Kentucky |  |  |
Related Party Transaction |  |  |
As of the beginning of period | 21,431 | 22,092 | 21,750
Payments | 3,597 | 3,597 | 3,597
Recoupment | (5,380) | (4,258) | (3,255)
As of the end of period | 19,648 | 21,431 | 22,092
WKY CoalPlay | December 2014 coal lease - Henderson County, Kentucky |  |  |
Related Party Transaction |  |  |
As of the beginning of period | 22,693 | 20,172 | 17,650
Payments | 2,521 | 2,521 | 2,522
Recoupment | (258) |  |
As of the end of period | 24,956 | 22,693 | 20,172
WKY CoalPlay | February 2015 coal lease - Henderson and Union Counties, Kentucky |  |  |
Related Party Transaction |  |  |
As of the beginning of period | 18,975 | 16,844 | 14,713
Payments | 2,131 | 2,131 | 2,131
Recoupment | (21) |  |
As of the end of period | $ 21,085 | $ 18,975 | $ 16,844

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