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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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Amount paid during the period for minimum coal royalty obligations.

+ References

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- Definition

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Amount paid in advance not recoupable for coal royalty obligations.

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 946
-SubTopic 220
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.6-07(2)(c)(2)(i))
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147483575/946-220-S99-1

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 946
-SubTopic 220
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.6-07(2)(c)(2)(ii))
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147483575/946-220-S99-1

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Topic 946
-SubTopic 220
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.6-07(2)(g)(3))
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147483575/946-220-S99-1

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