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RELATED-PARTY TRANSACTIONS - Affiliate Royalty Agreements (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Related Party Transaction |  |  |
As of the beginning of period | $ 53,901 |  |
As of the end of period | 60,959 | $ 53,901 |
Coal lease |  |  |
Related Party Transaction |  |  |
As of the beginning of period | 41,216 | 32,645 | $ 32,993
Payments | 13,819 | 15,317 | 10,818
Recoupment | (4,078) | (4,178) | (3,271)
Unrecoupable | (2,568) | (2,568) | (7,895)
As of the end of period | 48,389 | 41,216 | 32,645
SGP | Tunnel Ridge |  |  |
Related Party Transaction |  |  |
As of the beginning of period | 1,500 |  | 3,000
Payments | 3,000 | 4,500 |
Recoupment | (3,000) | (3,000) | (3,000)
As of the end of period | 1,500 | 1,500 |
WKY CoalPlay | December 2014 coal lease - Henderson and Union Counties, Kentucky |  |  |
Related Party Transaction |  |  |
As of the beginning of period | 16,603 | 14,077 | 10,684
Payments | 3,597 | 3,597 | 3,597
Recoupment | (1,022) | (1,071) | (204)
As of the end of period | 19,178 | 16,603 | 14,077
WKY CoalPlay | December 2014 coal lease - Webster County, Kentucky |  |  |
Related Party Transaction |  |  |
As of the beginning of period |  |  | 5,356
Payments | 2,568 | 2,568 | 2,570
Recoupment |  |  | (31)
Unrecoupable | (2,568) | (2,568) | (7,895)
WKY CoalPlay | December 2014 coal lease - Henderson County, Kentucky |  |  |
Related Party Transaction |  |  |
As of the beginning of period | 12,607 | 10,086 | 7,566
Payments | 2,522 | 2,521 | 2,520
As of the end of period | 15,129 | 12,607 | 10,086
WKY CoalPlay | February 2015 coal lease - Henderson and Union Counties, Kentucky |  |  |
Related Party Transaction |  |  |
As of the beginning of period | 10,506 | 8,482 | 6,387
Payments | 2,132 | 2,131 | 2,131
Recoupment | (56) | (107) | (36)
As of the end of period | $ 12,582 | $ 10,506 | $ 8,482

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