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RELATED-PARTY TRANSACTIONS - Affiliate Royalty Agreements (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Related Party Transaction |  |  |
As of the beginning of period | $ 55,613 |  |
As of the end of period | 60,608 | $ 55,613 |
Coal lease |  |  |
Related Party Transaction |  |  |
As of the beginning of period | 55,613 | 48,389 | $ 41,216
Payments | 11,250 | 13,817 | 13,819
Recoupment | (6,255) | (4,025) | (4,078)
Unrecoupable |  | (2,568) | (2,568)
As of the end of period | 60,608 | 55,613 | 48,389
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 | 21,750 | 19,178 | 16,603
Payments | 3,597 | 3,597 | 3,597
Recoupment | (3,255) | (1,025) | (1,022)
As of the end of period | 22,092 | 21,750 | 19,178
WKY CoalPlay | December 2014 coal lease - Webster County, Kentucky |  |  |
Related Party Transaction |  |  |
Payments |  | 2,568 | 2,568
Unrecoupable |  | (2,568) | (2,568)
WKY CoalPlay | December 2014 coal lease - Henderson County, Kentucky |  |  |
Related Party Transaction |  |  |
As of the beginning of period | 17,650 | 15,129 | 12,607
Payments | 2,522 | 2,521 | 2,522
As of the end of period | 20,172 | 17,650 | 15,129
WKY CoalPlay | February 2015 coal lease - Henderson and Union Counties, Kentucky |  |  |
Related Party Transaction |  |  |
As of the beginning of period | 14,713 | 12,582 | 10,506
Payments | 2,131 | 2,131 | 2,132
Recoupment |  |  | (56)
As of the end of period | $ 16,844 | $ 14,713 | $ 12,582

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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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