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REVENUE FROM CONTRACTS WITH CUSTOMERS - Supply contracts (Details) $ in Thousands | Jun. 30, 2024 USD ($)
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Performance obligations unsatisfied or partially unsatisfied |
Total | $ 2,877,363
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2024-07-01 |
Performance obligations unsatisfied or partially unsatisfied |
Total | $ 1,099,422
Expected timing of satisfaction period | 6 months
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2025-01-01 |
Performance obligations unsatisfied or partially unsatisfied |
Total | $ 956,651
Expected timing of satisfaction period | 1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2026-01-01 |
Performance obligations unsatisfied or partially unsatisfied |
Total | $ 436,085
Expected timing of satisfaction period | 1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2027-01-01 |
Performance obligations unsatisfied or partially unsatisfied |
Total | $ 385,205
Expected timing of satisfaction period | 1 year
Illinois Basin Coal |
Performance obligations unsatisfied or partially unsatisfied |
Total | $ 1,969,444
Illinois Basin Coal | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2024-07-01 |
Performance obligations unsatisfied or partially unsatisfied |
Total | $ 682,321
Expected timing of satisfaction period | 6 months
Illinois Basin Coal | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2025-01-01 |
Performance obligations unsatisfied or partially unsatisfied |
Total | $ 580,348
Expected timing of satisfaction period | 1 year
Illinois Basin Coal | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2026-01-01 |
Performance obligations unsatisfied or partially unsatisfied |
Total | $ 351,675
Expected timing of satisfaction period | 1 year
Illinois Basin Coal | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2027-01-01 |
Performance obligations unsatisfied or partially unsatisfied |
Total | $ 355,100
Expected timing of satisfaction period | 1 year
Appalachia Coal |
Performance obligations unsatisfied or partially unsatisfied |
Total | $ 907,919
Appalachia Coal | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2024-07-01 |
Performance obligations unsatisfied or partially unsatisfied |
Total | $ 417,101
Expected timing of satisfaction period | 6 months
Appalachia Coal | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2025-01-01 |
Performance obligations unsatisfied or partially unsatisfied |
Total | $ 376,303
Expected timing of satisfaction period | 1 year
Appalachia Coal | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2026-01-01 |
Performance obligations unsatisfied or partially unsatisfied |
Total | $ 84,410
Expected timing of satisfaction period | 1 year
Appalachia Coal | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2027-01-01 |
Performance obligations unsatisfied or partially unsatisfied |
Total | $ 30,105
Expected timing of satisfaction period | 1 year

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