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Commitments and Contingencies - Future Minimum Volume Purchase Requirements (Details)
gal in Thousands
12 Months Ended
Dec. 31, 2020
gal
Long Term Commitment Excluding Unconditional Purchase Obligation [Abstract]  
2021 580,096
2022 575,686
2023 430,302
2024 322,177
2025 274,469
Thereafter 1,173,385
Total 3,356,115