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RELATED-PARTY TRANSACTIONS - Affiliate Royalty Agreements (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Related Party Transaction |  |  |
As of the beginning of period | $ 60,608 |  |
As of the end of period | 64,599 | $ 60,608 |
Coal lease |  |  |
Related Party Transaction |  |  |
As of the beginning of period | 60,608 | 55,613 | $ 48,389
Payments | 11,249 | 11,250 | 13,817
Recoupment | (7,258) | (6,255) | (4,025)
Unrecoupable |  |  | (2,568)
As of the end of period | 64,599 | 60,608 | 55,613
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 | 22,092 | 21,750 | 19,178
Payments | 3,597 | 3,597 | 3,597
Recoupment | (4,258) | (3,255) | (1,025)
As of the end of period | 21,431 | 22,092 | 21,750
WKY CoalPlay | December 2014 coal lease - Webster County, Kentucky |  |  |
Related Party Transaction |  |  |
Payments |  |  | 2,568
Unrecoupable |  |  | (2,568)
WKY CoalPlay | December 2014 coal lease - Henderson County, Kentucky |  |  |
Related Party Transaction |  |  |
As of the beginning of period | 20,172 | 17,650 | 15,129
Payments | 2,521 | 2,522 | 2,521
As of the end of period | 22,693 | 20,172 | 17,650
WKY CoalPlay | February 2015 coal lease - Henderson and Union Counties, Kentucky |  |  |
Related Party Transaction |  |  |
As of the beginning of period | 16,844 | 14,713 | 12,582
Payments | 2,131 | 2,131 | 2,131
As of the end of period | $ 18,975 | $ 16,844 | $ 14,713

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