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RELATED-PARTY TRANSACTIONS - Affiliate Royalty Agreements - Craft Foundations (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Tunnel Ridge
Related Party Transaction
Payments for earned royalties	$ 5.8	$ 6.1	$ 7.2
Tunnel Ridge
Related Party Transaction
Annual minimum coal royalties	$ 3.0
Tunnel Ridge | Joseph W Craft III Foundation | Tunnel Ridge
Related Party Transaction
Property ownership (as a percent)				50.00%
Tunnel Ridge | Kathleen S Craft Foundation | Tunnel Ridge
Related Party Transaction
Property ownership (as a percent)				50.00%

X

- Definition

The minimum amount of coal royalties to be paid annually to the related party, per the terms of the agreement.

+ References

No definition available.

+ Details

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X

- Definition

Represents the property ownership, as a percent.

+ References

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+ Details

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X

- Definition

The amount of cash paid for royalties during the current period.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 25
-Subparagraph (g)
-URI http://asc.fasb.org/extlink&oid=123570139&loc=d3e3536-108585

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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

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- Details

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- Details

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- Details

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- Details

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