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REVENUE FROM CONTRACTS WITH CUSTOMERS - Supply contracts (Details) $ in Thousands | Mar. 31, 2023 USD ($)
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Performance obligations unsatisfied or partially unsatisfied |
Total | $ 4,002,176
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2023-01-01 |
Performance obligations unsatisfied or partially unsatisfied |
Total | $ 1,645,421
Expected timing of satisfaction period | 9 months
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2024-01-01 |
Performance obligations unsatisfied or partially unsatisfied |
Total | $ 1,441,529
Expected timing of satisfaction period | 1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2025-01-01 |
Performance obligations unsatisfied or partially unsatisfied |
Total | $ 670,026
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 | $ 245,200
Expected timing of satisfaction period | 1 year
Illinois Basin Coal |
Performance obligations unsatisfied or partially unsatisfied |
Total | $ 2,478,334
Illinois Basin Coal | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2023-01-01 |
Performance obligations unsatisfied or partially unsatisfied |
Total | $ 998,751
Expected timing of satisfaction period | 9 months
Illinois Basin Coal | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2024-01-01 |
Performance obligations unsatisfied or partially unsatisfied |
Total | $ 891,382
Expected timing of satisfaction period | 1 year
Illinois Basin Coal | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2025-01-01 |
Performance obligations unsatisfied or partially unsatisfied |
Total | $ 344,601
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 | $ 243,600
Expected timing of satisfaction period | 1 year
Appalachia Coal |
Performance obligations unsatisfied or partially unsatisfied |
Total | $ 1,523,842
Appalachia Coal | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2023-01-01 |
Performance obligations unsatisfied or partially unsatisfied |
Total | $ 646,670
Expected timing of satisfaction period | 9 months
Appalachia Coal | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2024-01-01 |
Performance obligations unsatisfied or partially unsatisfied |
Total | $ 550,147
Expected timing of satisfaction period | 1 year
Appalachia Coal | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2025-01-01 |
Performance obligations unsatisfied or partially unsatisfied |
Total | $ 325,425
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 | $ 1,600
Expected timing of satisfaction period | 1 year

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