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FAIR VALUE MEASUREMENTS (Tables) | 3 Months Ended
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Mar. 31, 2025
FAIR VALUE MEASUREMENTS |
Schedule of fair value measurements hierarchy | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | Fair Value | ​
​ |  | Carrying Value |  | Level 1 |  | Level 2 |  | Level 3 |
​ | ​ | (in thousands) | ​
March 31, 2025 | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Recorded on a recurring basis: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Digital assets | ​ | $ | 42,323 | ​ | $ | 42,323 | ​ | $ | — | ​ | $ | — | ​
Contingent consideration | ​ | $ | 11,324 | ​ | $ | — | ​ | $ | — | ​ | $ | 11,324 | ​
Additional disclosures: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Long-term debt | ​ | $ | 483,754 | ​ | $ | — | ​ | $ | 508,931 | ​ | $ | — | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
December 31, 2024 | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Recorded on a recurring basis: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Digital assets | ​ | $ | 45,037 | ​ | $ | 45,037 | ​ | $ | — | ​ | $ | — | ​
Contingent consideration | ​ | $ | 13,100 | ​ | $ | — | ​ | $ | — | ​ | $ | 13,100 | ​
Additional disclosures: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Long-term debt | ​ | $ | 490,387 | ​ | $ | — | ​ | $ | 523,461 | ​ | $ | — | ​
Schedule of fair value measurements inputs | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | Valuation Technique(s) |  | Unobservable Input |  | Range/Amount (Average) (a) | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
March 31, 2025 | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
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, 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% | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
(a) Averages represent the arithmetic average of the inputs and is not weighted by a relative fair value or notional amount | ​
Schedule of contingent consideration liability changes | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Three Months Ended | ​
​ | ​ | March 31, | ​
​ |  | 2025 | ​ | 2024 |
​ | ​ | (in thousands) | ​
Beginning balance | ​ | $ | 13,100 | ​ | $ | 9,900 | ​
Payments | ​ | ​ | (1,776) | ​ | ​ | (1,431) | ​
Ending balance | ​ | $ | 11,324 | ​ | $ | 8,469 | ​
​

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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 + Details
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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 + Details
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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. + References No definition available. + Details
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