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REVENUE FROM CONTRACTS WITH CUSTOMERS - Coal supply contracts (Details) $ in Thousands | Dec. 31, 2019 USD ($)
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Performance obligations unsatisfied or partially unsatisfied |
Total | $ 1,907,755
Illinois Basin |
Performance obligations unsatisfied or partially unsatisfied |
Total | 1,329,732
Appalachia |
Performance obligations unsatisfied or partially unsatisfied |
Total | 578,023
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2020-01-01 |
Performance obligations unsatisfied or partially unsatisfied |
Total | $ 1,275,202
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 | $ 849,040
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 | $ 426,162
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 | $ 535,537
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 | $ 437,808
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 | $ 97,729
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 | $ 88,546
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 | $ 34,414
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 | $ 54,132
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 | $ 8,470
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 | $ 8,470
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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