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Revenue from Contracts with Customers | 6 Months Ended
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Jun. 30, 2025
Revenue from Contract with Customer [Abstract] |
Revenue from Contracts with Customer | 14.REVENUE FROM CONTRACTS WITH CUSTOMERS ​ The following table illustrates the disaggregation of our revenues by type, including a reconciliation to our segment presentation as presented in Note 17 – Segment Information. ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | Coal Operations | ​ | Royalties | ​ | Other, | ​ | ​ | ​ | ​
​ | ​ | Illinois |  | ​ |  | ​ | ​ | ​ |  | Corporate and |  | ​ | ​ | ​
​ |  | Basin |  | Appalachia |  | Oil & Gas |  | Coal |  | Elimination |  | Consolidated | ​
​ | ​ | (in thousands) | ​
Three Months Ended June 30, 2025 | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Coal sales | ​ | $ | 343,841 | ​ | $ | 141,628 | ​ | $ | — | ​ | $ | — | ​ | $ | — | ​ | $ | 485,469 | ​
Oil & gas royalties | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 35,473 | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 35,473 | ​
Coal royalties | ​ | ​ | — | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 17,612 | ​ | ​ | (17,612) | ​ | ​ | — | ​
Transportation revenues | ​ | ​ | 4,829 | ​ | ​ | 3,729 | ​ | ​ | — | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 8,558 | ​
Other revenues | ​ | ​ | 1,577 | ​ | ​ | 626 | ​ | ​ | 28 | ​ | ​ | — | ​ | ​ | 15,732 | ​ | ​ | 17,963 | ​
Total revenues | ​ | $ | 350,247 | ​ | $ | 145,983 | ​ | $ | 35,501 | ​ | $ | 17,612 | ​ | $ | (1,880) | ​ | $ | 547,463 | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Three Months Ended June 30, 2024 | ​
​ | ​ |  | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Coal sales | ​ | $ | 331,973 | ​ | $ | 180,686 | ​ | $ | — | ​ | $ | — | ​ | $ | — | ​ | $ | 512,659 | ​
Oil & gas royalties | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 36,429 | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 36,429 | ​
Coal royalties | ​ | ​ | — | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 16,584 | ​ | ​ | (16,584) | ​ | ​ | — | ​
Transportation revenues | ​ | ​ | 20,570 | ​ | ​ | 6,131 | ​ | ​ | — | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 26,701 | ​
Other revenues | ​ | ​ | 2,218 | ​ | ​ | 1,395 | ​ | ​ | 8 | ​ | ​ | 3 | ​ | ​ | 13,937 | ​ | ​ | 17,561 | ​
Total revenues | ​ | $ | 354,761 | ​ | $ | 188,212 | ​ | $ | 36,437 | ​ | $ | 16,587 | ​ | $ | (2,647) | ​ | $ | 593,350 | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Six Months Ended June 30, 2025 | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Coal sales | ​ | $ | 677,075 | ​ | $ | 276,905 | ​ | $ | — | ​ | $ | — | ​ | $ | — | ​ | $ | 953,980 | ​
Oil & gas royalties | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 71,557 | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 71,557 | ​
Coal royalties | ​ | ​ | — | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 33,407 | ​ | ​ | (33,407) | ​ | ​ | — | ​
Transportation revenues | ​ | ​ | 11,692 | ​ | ​ | 7,066 | ​ | ​ | — | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 18,758 | ​
Other revenues | ​ | ​ | 4,475 | ​ | ​ | 1,508 | ​ | ​ | 857 | ​ | ​ | — | ​ | ​ | 36,796 | ​ | ​ | 43,636 | ​
Total revenues | ​ | $ | 693,242 | ​ | $ | 285,479 | ​ | $ | 72,414 | ​ | $ | 33,407 | ​ | $ | 3,389 | ​ | $ | 1,087,931 | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Six Months Ended June 30, 2024 | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ |  | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Coal sales | ​ | $ | 702,603 | ​ | $ | 371,935 | ​ | $ | — | ​ | $ | — | ​ | $ | — | ​ | $ | 1,074,538 | ​
Oil & gas royalties | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 73,459 | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 73,459 | ​
Coal royalties | ​ | ​ | — | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 35,286 | ​ | ​ | (35,286) | ​ | ​ | — | ​
Transportation revenues | ​ | ​ | 45,046 | ​ | ​ | 12,408 | ​ | ​ | — | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 57,454 | ​
Other revenues | ​ | ​ | 4,953 | ​ | ​ | 1,883 | ​ | ​ | 323 | ​ | ​ | 9 | ​ | ​ | 32,428 | ​ | ​ | 39,596 | ​
Total revenues | ​ | $ | 752,602 | ​ | $ | 386,226 | ​ | $ | 73,782 | ​ | $ | 35,295 | ​ | $ | (2,858) | ​ | $ | 1,245,047 | ​
​ The following table illustrates the beginning and ending balances of our trade receivables: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | Three Months Ended | ​ | Six Months Ended | ​
​ | ​ | June 30, | ​ | June 30, | ​
​ | ​ | 2025 |  | 2024 |  | 2025 |  | 2024 |
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | (in thousands) | ​
Beginning balance | ​ | $ | 177,467 | ​ | $ | 272,191 | ​ | $ | 166,829 | ​ | $ | 282,622 |
Ending balance | ​ | $ | 177,659 | ​ | $ | 226,436 | ​ | $ | 177,659 | ​ | $ | 226,436 | ​
​ The following table illustrates the amount of our transaction price for all current coal supply contracts allocated to performance obligations that are unsatisfied or partially unsatisfied as of June 30, 2025 and disaggregated by segment and contract duration. ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | 2028 and | ​ | ​
​ |  | 2025 |  | 2026 |  | 2027 |  | Thereafter |  | Total
​ | ​ | (in thousands)
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Illinois Basin Coal Operations coal revenues | ​ | $ | 609,685 | ​ | $ | 1,036,588 | ​ | $ | 653,033 | ​ | $ | 739,113 | ​ | $ | 3,038,419
Appalachia Coal Operations coal revenues | ​ | ​ | 350,752 | ​ | ​ | 135,861 | ​ | ​ | 62,005 | ​ | ​ | 27,000 | ​ | ​ | 575,618
Total coal revenues (1) | ​ | $ | 960,437 | ​ | $ | 1,172,449 | ​ | $ | 715,038 | ​ | $ | 766,113 | ​ | $ | 3,614,037
(1) Coal revenues generally consists of consolidated revenues excluding our Oil & Gas Royalties segment as well as intercompany revenues from our Coal Royalties segment.

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- Definition The entire disclosure of revenue from contract with customer to transfer good or service and to transfer nonfinancial asset. Includes, but is not limited to, disaggregation of revenue, credit loss recognized from contract with customer, judgment and change in judgment related to contract with customer, and asset recognized from cost incurred to obtain or fulfill contract with customer. Excludes insurance and lease contracts. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 606 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 9 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479806/606-10-50-9 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 606 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 10 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479806/606-10-50-10 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 606 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 15 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479806/606-10-50-15 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 606 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 12 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479806/606-10-50-12 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Topic 606 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 12 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479806/606-10-50-12 Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Topic 606 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 12 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479806/606-10-50-12 Reference 7: http://www.xbrl.org/2003/role/disclosureRef -Topic 606 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 12 -Subparagraph (d) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479806/606-10-50-12 Reference 8: http://www.xbrl.org/2003/role/disclosureRef -Topic 606 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 12 -Subparagraph (e) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479806/606-10-50-12 Reference 9: http://www.xbrl.org/2003/role/disclosureRef -Topic 606 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 13 -Subparagraph (b)(2) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479806/606-10-50-13 Reference 10: http://www.xbrl.org/2003/role/disclosureRef -Name Accounting Standards Codification -Topic 606 -Publisher FASB -URI https://asc.fasb.org/606/tableOfContent + Details
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