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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

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Amount paid during the period for minimum coal royalty obligations.

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