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RELATED-PARTY TRANSACTIONS - Affiliate Royalty Agreements (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Related Party Transaction |  |  |
As of the beginning of period | $ 48,389 |  |
As of the end of period | 55,613 | $ 48,389 |
Coal lease |  |  |
Related Party Transaction |  |  |
As of the beginning of period | 48,389 | 41,216 | $ 32,645
Payments | 13,817 | 13,819 | 15,317
Recoupment | (4,025) | (4,078) | (4,178)
Unrecoupable | (2,568) | (2,568) | (2,568)
As of the end of period | 55,613 | 48,389 | 41,216
Tunnel Ridge |  |  |
Related Party Transaction |  |  |
As of the beginning of period | 1,500 | 1,500 |
Payments | 3,000 | 3,000 | 4,500
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 | 19,178 | 16,603 | 14,077
Payments | 3,597 | 3,597 | 3,597
Recoupment | (1,025) | (1,022) | (1,071)
As of the end of period | 21,750 | 19,178 | 16,603
WKY CoalPlay | December 2014 coal lease - Webster County, Kentucky |  |  |
Related Party Transaction |  |  |
Payments | 2,568 | 2,568 | 2,568
Unrecoupable | (2,568) | (2,568) | (2,568)
WKY CoalPlay | December 2014 coal lease - Henderson County, Kentucky |  |  |
Related Party Transaction |  |  |
As of the beginning of period | 15,129 | 12,607 | 10,086
Payments | 2,521 | 2,522 | 2,521
As of the end of period | 17,650 | 15,129 | 12,607
WKY CoalPlay | February 2015 coal lease - Henderson and Union Counties, Kentucky |  |  |
Related Party Transaction |  |  |
As of the beginning of period | 12,582 | 10,506 | 8,482
Payments | 2,131 | 2,132 | 2,131
Recoupment |  | (56) | (107)
As of the end of period | $ 14,713 | $ 12,582 | $ 10,506

X
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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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- Definition A recoupment of amount paid in advance for coal royalty obligations. + References No definition available. + Details
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