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COMMITMENTS AND CONTINGENCIES - MINIMUM ANNUAL PAYMENTS (Details)
$ in Thousands
Jun. 30, 2021
USD ($)
Purchase Obligation, Fiscal Year Maturity [Abstract]  
Remainder of 2021 $ 13,170
2022 24,322
2023 4,052
2024 0
2025 0
2026 and thereafter 0
Total 41,544
Firm Transportation  
Purchase Obligation, Fiscal Year Maturity [Abstract]  
Remainder of 2021 6,505
2022 13,064
2023 14,600
2024 14,640
2025 4,800
2026 and thereafter 0
Total $ 53,609