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Segment Information (Tables) | 6 Months Ended
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Jun. 30, 2026
Segment Reporting [Abstract] |
Schedule of Segment Operating Results and Capital Expenditures | Met reportable segment results for the three and six months ended June 30, 2026 and 2025 are as follows:
| Three Months Ended June 30, |  | Six Months Ended June 30,
| 2026 |  | 2025 |  | 2026 |  | 2025
Coal revenues | $ | 491,505 |  |  | $ | 548,675 |  |  | $ | 1,015,038 |  |  | $ | 1,078,342 |
Other revenues | 1,351 |  |  | 1,599 |  |  | 2,805 |  |  | 3,889 |
Total revenues | $ | 492,856 |  |  | $ | 550,274 |  |  | $ | 1,017,843 |  |  | $ | 1,082,231 |
Non-GAAP cost of coal sales | $ | 365,789 |  |  | $ | 388,844 |  |  | $ | 754,092 |  |  | $ | 803,513 |
Freight and handling costs | 70,220 |  |  | 84,589 |  |  | 146,434 |  |  | 168,513 |
Idled and closed mine costs | 7,654 |  |  | 6,520 |  |  | 17,526 |  |  | 12,511 |
Cost of coal sales (exclusive of items shown separately below) | $ | 443,663 |  |  | $ | 479,953 |  |  | $ | 918,052 |  |  | $ | 984,537 |
Depreciation, depletion and amortization | $ | 36,044 |  |  | $ | 44,822 |  |  | $ | 75,970 |  |  | $ | 88,732 |
Accretion on asset retirement obligations | 5,214 |  |  | 5,508 |  |  | 10,429 |  |  | 11,122 |
Amortization of acquired intangibles | 876 |  |  | 1,357 |  |  | 1,752 |  |  | 2,714 |
Selling, general and administrative expenses | 17,257 |  |  | 15,216 |  |  | 33,855 |  |  | 30,640 |
Interest expense | 962 |  |  | 761 |  |  | 1,803 |  |  | 1,524 |
Interest income | (2,919) |  |  | (4,199) |  |  | (7,125) |  |  | (8,245) |
Equity loss in affiliates | 6,717 |  |  | 8,736 |  |  | 12,450 |  |  | 13,696 |
Other segment items (1) | 3,889 |  |  | 4,322 |  |  | 5,862 |  |  | 9,097 |
Income tax benefit | (6,595) |  |  | (1,248) |  |  | (11,921) |  |  | (12,685) |
Total other expenses | $ | 61,445 |  |  | $ | 75,275 |  |  | $ | 123,075 |  |  | $ | 136,595 |
Net loss | $ | (12,252) |  |  | $ | (4,954) |  |  | $ | (23,284) |  |  | $ | (38,901) |
(1) Other segment items include Other operating loss (income) and Miscellaneous expense, net. The following tables present additional information on the Company’s revenues and top customers:
| Three Months Ended June 30, |  | Six Months Ended June 30,
| 2026 |  | 2025 |  | 2026 |  | 2025
Total coal revenues | $ | 491,505 |  |  | $ | 548,675 |  |  | $ | 1,015,038 |  |  | $ | 1,078,342 |
Total revenues | $ | 492,856 |  |  | $ | 550,274 |  |  | $ | 1,017,843 |  |  | $ | 1,082,231 |
Export coal revenues | $ | 353,683 |  |  | $ | 394,979 |  |  | $ | 757,104 |  |  | $ | 790,694 |
Export coal revenues as % of total coal revenues | 72 | % |  | 72 | % |  | 75 | % |  | 73 | %
Countries with export coal revenue exceeding 10% of total revenues | India, Turkey, Brazil |  | India, Brazil |  | India, Turkey |  | India
Top customer as % of total revenues | 15 | % |  | 16 | % |  | 13 | % |  | 14 | %
Top 10 customers as % of total revenues | 73 | % |  | 80 | % |  | 76 | % |  | 80 | %
Number of customers exceeding 10% of total revenues | 2 |  | 3 |  | 3 |  | 4
| As of June 30,
| 2026 |  | 2025
Number of customers exceeding 10% of total trade accounts receivable, net | 3 |  | 3

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