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REVENUE FROM CONTRACTS WITH CUSTOMERS - Supply contracts (Details) $ in Thousands | Jun. 30, 2021 USD ($)
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Performance obligations unsatisfied or partially unsatisfied |
Total | $ 1,621,684
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2021-01-01 |
Performance obligations unsatisfied or partially unsatisfied |
Total | $ 664,897
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 | $ 488,882
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 | $ 255,950
Expected timing of satisfaction period | 1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2024-01-01 |
Performance obligations unsatisfied or partially unsatisfied |
Total | $ 211,955
Expected timing of satisfaction period | 1 year
Illinois Basin |
Performance obligations unsatisfied or partially unsatisfied |
Total | $ 1,191,692
Illinois Basin | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2021-01-01 |
Performance obligations unsatisfied or partially unsatisfied |
Total | $ 446,385
Expected timing of satisfaction period | 1 year
Illinois Basin | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2022-01-01 |
Performance obligations unsatisfied or partially unsatisfied |
Total | $ 305,362
Expected timing of satisfaction period | 1 year
Illinois Basin | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2023-01-01 |
Performance obligations unsatisfied or partially unsatisfied |
Total | $ 238,070
Expected timing of satisfaction period | 1 year
Illinois Basin | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2024-01-01 |
Performance obligations unsatisfied or partially unsatisfied |
Total | $ 201,875
Expected timing of satisfaction period | 1 year
Appalachia |
Performance obligations unsatisfied or partially unsatisfied |
Total | $ 429,992
Appalachia | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2021-01-01 |
Performance obligations unsatisfied or partially unsatisfied |
Total | $ 218,512
Expected timing of satisfaction period | 1 year
Appalachia | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2022-01-01 |
Performance obligations unsatisfied or partially unsatisfied |
Total | $ 183,520
Expected timing of satisfaction period | 1 year
Appalachia | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2023-01-01 |
Performance obligations unsatisfied or partially unsatisfied |
Total | $ 17,880
Expected timing of satisfaction period | 1 year
Appalachia | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2024-01-01 |
Performance obligations unsatisfied or partially unsatisfied |
Total | $ 10,080
Expected timing of satisfaction period | 1 year

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