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FAIR VALUE MEASUREMENTS (Tables)

12 Months Ended

Dec. 31, 2024

FAIR VALUE MEASUREMENTS

Schedule of fair value measurements within the hierarchy

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Fair Value

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Carrying Value

Level 1

Level 2

Level 3

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(in thousands)

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December 31, 2024

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Recorded on a recurring basis:

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Digital assets (1)

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$

45,037

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$

45,037

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$

—

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$

—

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Contingent consideration

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$

13,100

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$

—

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$

—

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$

13,100

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Additional disclosures:

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Long-term debt

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$

490,387

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$

—

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$

523,461

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$

—

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December 31, 2023

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Recorded on a recurring basis:

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Contingent consideration

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$

9,900

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$

—

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$

—

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$

9,900

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Additional disclosures:

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Long-term debt

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$

347,584

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$

—

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$

347,116

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$

—

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(1) As discussed in Note 2 – Summary of Significant Accounting Policies, we adopted ASU 2023-08 effective January 1, 2024. Prior to our adoption, our digital assets were not recorded at fair value on a recurring basis.

Schedule of fair value measurements inputs

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​		Valuation Technique(s)		Unobservable Input		Range/Amount (Average) (a)	​
​	​	​	​	​	​	​	​
December 31, 2024	​	​	​	​	​	​	​
​	​	​	​	​	​	​	​
Contingent Consideration	​	Option approach methodology simulation	​	Cost of Debt	​	6.51% - 8.56%	​
​	​	​	​	Coal price volatility	​	6.2%	​
​	​	​	​	Market price of risk adjustment (annual)	​	6.2%	​
December 31, 2023	​	​	​	​	​	​	​
​	​	​	​	​	​	​	​
Contingent Consideration	​	Option approach methodology simulation	​	Cost of Debt	​	7.27% - 9.08%	​
​	​	​	​	Coal price volatility	​	6.3%	​
​	​	​	​	Market price of risk adjustment (annual)	​	7.8%	​
​	​	​	​	​	​	​	​
(a) Averages represent the arithmetic average of the inputs and is not weighted by a relative fair value or notional amount							​

Schedule of changes in our contingent consideration liability

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​	​	​	​	​	​	​	​
​	​	Year Ended December 31,					​
​		2024		​	2023
​	​	(in thousands)					​
Beginning balance	​	$	9,900	​	$	10,100	​
Noncash changes in fair value (1)	​	​	10,989	​	​	1,650	​
Payments	​	​	(7,789)	​	​	(1,850)	​
Ending balance	​	$	13,100	​	$	9,900	​

(1) Noncash changes in the fair value of our continent consideration liability are included in the Operating expenses (excluding depreciation, depletion and amortization) line item within our consolidated statements of income.

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- Definition

Tabular disclosure of input and valuation technique used to measure fair value and change in valuation approach and technique for each separate class of asset and liability measured on recurring and nonrecurring basis.

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Topic 820
-SubTopic 10
-Name Accounting Standards Codification
-Section 55
-Paragraph 103
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482078/820-10-55-103

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 820
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (bbb)(2)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482106/820-10-50-2

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Topic 820
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (bbb)(1)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482106/820-10-50-2

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- Definition

Tabular disclosure of the fair value of financial instruments, including financial assets and financial liabilities, and the measurements of those instruments, assets, and liabilities.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 11
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482907/825-10-50-11

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- Definition

Tabular disclosure of contingent payment arrangements including the terms that will result in payment and the accounting treatment that will be followed if such contingencies occur, including the potential impact on earnings per share if contingencies are to be settled in common stock of the entity. The description also may include the period over which amounts are expected to be paid, and changes in the amount since the previous reporting period. This also includes contingent options and commitments.

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