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REVENUE FROM CONTRACTS WITH CUSTOMERS - Coal supply contracts (Details) $ in Thousands | Sep. 30, 2020 USD ($)
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Performance obligations unsatisfied or partially unsatisfied |
Total | $ 1,739,843
Illinois Basin |
Performance obligations unsatisfied or partially unsatisfied |
Total | 1,413,537
Appalachia |
Performance obligations unsatisfied or partially unsatisfied |
Total | 326,306
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2020-10-01 |
Performance obligations unsatisfied or partially unsatisfied |
Total | $ 386,702
Expected timing of satisfaction period | 3 months
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2020-10-01 | Illinois Basin |
Performance obligations unsatisfied or partially unsatisfied |
Total | $ 248,362
Expected timing of satisfaction period | 3 months
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2020-10-01 | Appalachia |
Performance obligations unsatisfied or partially unsatisfied |
Total | $ 138,340
Expected timing of satisfaction period | 3 months
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2021-01-01 |
Performance obligations unsatisfied or partially unsatisfied |
Total | $ 749,041
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 | $ 618,966
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 | $ 130,075
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 | $ 296,405
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 | $ 238,514
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 | $ 57,891
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 | $ 307,695
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 | $ 307,695
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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