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.

Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 280
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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 270
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Reference 3: http://www.xbrl.org/2003/role/disclosureRef
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-Publisher FASB
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Reference 4: http://fasb.org/us-gaap/role/ref/otherTransitionRef
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Reference 5: http://fasb.org/us-gaap/role/ref/otherTransitionRef
-Topic 280
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-Name Accounting Standards Codification
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Reference 6: http://www.xbrl.org/2003/role/disclosureRef
-Topic 924
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-Section S99
-Paragraph 1
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Reference 7: http://www.xbrl.org/2003/role/disclosureRef
-Topic 606
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-Topic 280
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Reference 9: http://www.xbrl.org/2003/role/disclosureRef
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-Topic 606
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+ Details

REVENUE - Narrative (Details) - Rate stabilization - USD ($) $ in Thousands	1 Months Ended	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	$ 76,400	$ 108,222	$ 14,041	$ 125,123	$ 36,862
Colowyo Mine
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	8,200
J.M. Shafer and Colowyo Coal \| Acquisition costs
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	$ 68,200