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Derivatives and Risk Management - Schedule of Energy Commodity Derivative Volumes (Details) MWh in Thousands, MMBTU in Thousands | 12 Months Ended
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Dec. 31, 2020 MWh MMBTU | Dec. 31, 2019 MWh MMBTU
Purchase [Member] | Physical [Member] | Electric Derivative [Member] |  |
Energy Commodity Derivative Volumes [Line Items] |  |
2021 | MWh | 1 | 2
2022 | MWh | 0 | 0
2023 | MWh | 0 | 0
2024 | MWh | 0 |
2025 | MWh | 0 |
Purchase [Member] | Physical [Member] | Gas Derivative [Member] |  |
Energy Commodity Derivative Volumes [Line Items] |  |
2021 | MMBTU | 10,353 | 9,813
2022 | MMBTU | 450 | 153
2023 | MMBTU | 0 | 225
2024 | MMBTU | 0 |
2025 | MMBTU | 0 |
Purchase [Member] | Financial [Member] | Electric Derivative [Member] |  |
Energy Commodity Derivative Volumes [Line Items] |  |
2021 | MWh | 224 | 442
2022 | MWh | 0 | 0
2023 | MWh | 0 | 0
2024 | MWh | 0 |
2025 | MWh | 0 |
Purchase [Member] | Financial [Member] | Gas Derivative [Member] |  |
Energy Commodity Derivative Volumes [Line Items] |  |
2021 | MMBTU | 65,188 | 78,803
2022 | MMBTU | 25,525 | 25,523
2023 | MMBTU | 4,950 | 4,725
2024 | MMBTU | 0 |
2025 | MMBTU | 0 |
Sales [Member] | Physical [Member] | Electric Derivative [Member] |  |
Energy Commodity Derivative Volumes [Line Items] |  |
2021 | MWh | 17 | 133
2022 | MWh | 0 | 0
2023 | MWh | 0 | 0
2024 | MWh | 0 |
2025 | MWh | 0 |
Sales [Member] | Physical [Member] | Gas Derivative [Member] |  |
Energy Commodity Derivative Volumes [Line Items] |  |
2021 | MMBTU | 5,448 | 2,984
2022 | MMBTU | 1,360 | 1,040
2023 | MMBTU | 1,360 | 0
2024 | MMBTU | 1,370 |
2025 | MMBTU | 1,115 |
Sales [Member] | Financial [Member] | Electric Derivative [Member] |  |
Energy Commodity Derivative Volumes [Line Items] |  |
2021 | MWh | 451 | 1,724
2022 | MWh | 0 | 246
2023 | MWh | 0 | 0
2024 | MWh | 0 |
2025 | MWh | 0 |
Sales [Member] | Financial [Member] | Gas Derivative [Member] |  |
Energy Commodity Derivative Volumes [Line Items] |  |
2021 | MMBTU | 39,273 | 37,848
2022 | MMBTU | 12,030 | 13,108
2023 | MMBTU | 900 | 675
2024 | MMBTU | 0 |
2025 | MMBTU | 0 |

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- Definition Energy Commodity Derivative Expected To Be Settle Year Five + References No definition available. + Details
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