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REVENUE FROM CONTRACTS WITH CUSTOMERS - Coal supply contracts (Details) $ in Thousands | Jun. 30, 2020 USD ($)
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Performance obligations unsatisfied or partially unsatisfied |
Total | $ 1,949,034
Illinois Basin |
Performance obligations unsatisfied or partially unsatisfied |
Total | 1,558,199
Appalachia |
Performance obligations unsatisfied or partially unsatisfied |
Total | 390,835
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2020-07-01 |
Performance obligations unsatisfied or partially unsatisfied |
Total | $ 702,329
Expected timing of satisfaction period | 6 months
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2020-07-01 | Illinois Basin |
Performance obligations unsatisfied or partially unsatisfied |
Total | $ 462,549
Expected timing of satisfaction period | 6 months
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2020-07-01 | Appalachia |
Performance obligations unsatisfied or partially unsatisfied |
Total | $ 239,780
Expected timing of satisfaction period | 6 months
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2021-01-01 |
Performance obligations unsatisfied or partially unsatisfied |
Total | $ 692,118
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 | $ 598,941
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 | $ 93,177
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 | $ 280,392
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 | $ 222,514
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 | $ 57,878
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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