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REVENUE FROM CONTRACTS WITH CUSTOMERS - Coal supply contracts (Details) $ in Thousands | Mar. 31, 2020 USD ($)
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Performance obligations unsatisfied or partially unsatisfied |
Total | $ 2,177,006
Illinois Basin |
Performance obligations unsatisfied or partially unsatisfied |
Total | 1,679,338
Appalachia |
Performance obligations unsatisfied or partially unsatisfied |
Total | 497,668
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2020-01-01 |
Performance obligations unsatisfied or partially unsatisfied |
Total | $ 969,965
Expected timing of satisfaction period | 1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2020-01-01 | Illinois Basin |
Performance obligations unsatisfied or partially unsatisfied |
Total | $ 621,541
Expected timing of satisfaction period | 1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2020-01-01 | Appalachia |
Performance obligations unsatisfied or partially unsatisfied |
Total | $ 348,424
Expected timing of satisfaction period | 1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2021-01-01 |
Performance obligations unsatisfied or partially unsatisfied |
Total | $ 680,193
Expected timing of satisfaction period | 1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2021-01-01 | Illinois Basin |
Performance obligations unsatisfied or partially unsatisfied |
Total | $ 588,838
Expected timing of satisfaction period | 1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2021-01-01 | Appalachia |
Performance obligations unsatisfied or partially unsatisfied |
Total | $ 91,355
Expected timing of satisfaction period | 1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2022-01-01 |
Performance obligations unsatisfied or partially unsatisfied |
Total | $ 252,653
Expected timing of satisfaction period | 1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2022-01-01 | Illinois Basin |
Performance obligations unsatisfied or partially unsatisfied |
Total | $ 194,764
Expected timing of satisfaction period | 1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2022-01-01 | Appalachia |
Performance obligations unsatisfied or partially unsatisfied |
Total | $ 57,889
Expected timing of satisfaction period | 1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2023-01-01 |
Performance obligations unsatisfied or partially unsatisfied |
Total | $ 274,195
Expected timing of satisfaction period |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2023-01-01 | Illinois Basin |
Performance obligations unsatisfied or partially unsatisfied |
Total | $ 274,195
Expected timing of satisfaction period |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2023-01-01 | Appalachia |
Performance obligations unsatisfied or partially unsatisfied |
Expected timing of satisfaction period |

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