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Revenue (Tables) | 6 Months Ended
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Jun. 30, 2026
Revenue from Contract with Customer [Abstract] |
Schedule of Disaggregation of Revenue | The following tables disaggregate the Company’s coal revenues by product category and by market to depict how the nature, amount, timing, and uncertainty of the Company’s coal revenues and cash flows are affected by economic factors:
| Three Months Ended June 30, |  | Six Months Ended June 30,
| 2026 |  | 2025 |  | 2026 |  | 2025
Export met coal revenues | $ | 325,304 |  |  | $ | 378,021 |  |  | $ | 717,715 |  |  | $ | 754,761 |
Export thermal coal revenues | 28,379 |  |  | 16,958 |  |  | 39,389 |  |  | 35,933 |
Total export coal revenues | $ | 353,683 |  |  | $ | 394,979 |  |  | $ | 757,104 |  |  | $ | 790,694 |
Domestic met coal revenues | $ | 128,215 |  |  | $ | 147,377 |  |  | $ | 241,986 |  |  | $ | 276,039 |
Domestic thermal coal revenues | 9,607 |  |  | 6,319 |  |  | 15,948 |  |  | 11,609 |
Total domestic coal revenues | $ | 137,822 |  |  | $ | 153,696 |  |  | $ | 257,934 |  |  | $ | 287,648 |
Total met coal revenues | $ | 453,519 |  |  | $ | 525,398 |  |  | $ | 959,701 |  |  | $ | 1,030,800 |
Total thermal coal revenues | 37,986 |  |  | 23,277 |  |  | 55,337 |  |  | 47,542 |
Total coal revenues | $ | 491,505 |  |  | $ | 548,675 |  |  | $ | 1,015,038 |  |  | $ | 1,078,342 |
Schedule of Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction | The following table includes estimated revenue expected to be recognized in the future related to performance obligations that are unsatisfied as of June 30, 2026:
| Remainder of 2026 |  | 2027 |  | 2028 |  | 2029 |  | 2030 |  | Total
Estimated coal revenues (1) | $ | 53,203 |  |  | $ | 54,370 |  |  | $ | 16,800 |  |  | $ | — |  |  | $ | — |  |  | $ | 124,373 |
(1) Amounts include only estimated coal revenues associated with customer contracts with fixed pricing and original expected duration of more than one year. Refer to Note 3 to the Consolidated Financial Statements included in the Company’s Annual Report on Form 10-K for the year ended December 31, 2025.

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- Definition Tabular disclosure of disaggregation of revenue into categories depicting how nature, amount, timing, and uncertainty of revenue and cash flows are affected by economic factor. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 606 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 5 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479806/606-10-50-5 + Details
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- Definition Tabular disclosure of expected timing for satisfying remaining performance obligation. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name Accounting Standards Codification -Section 50 -Paragraph 13 -Subparagraph (b)(1) -SubTopic 10 -Topic 606 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479806/606-10-50-13 + Details
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