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Derivatives and Risk Management - Schedule of Energy Commodity Derivative Volumes (Details) frequency in Thousands, MWh in Thousands, MMBTU in Thousands | 9 Months Ended | 12 Months Ended
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Sep. 30, 2020 MWh MMBTU frequency | Dec. 31, 2019 MWh MMBTU
Purchase [Member] | Physical [Member] | Electric Derivative [Member] |  |
Energy Commodity Derivative Volumes [Line Items] |  |
2020 | 0 | 2
2021 | 0 | 0
2022 | 0 | 0
2023 | 0 | 0
2024 | 0 | 0
Thereafter | 0 | 0
Purchase [Member] | Physical [Member] | Gas Derivative [Member] |  |
Energy Commodity Derivative Volumes [Line Items] |  |
2020 | MMBTU | 8,502 | 9,813
2021 | MMBTU | 6,380 | 153
2022 | MMBTU | 450 | 225
2023 | MMBTU | 0 | 0
2024 | MMBTU | 0 | 0
Thereafter | MMBTU | 0 | 0
Purchase [Member] | Financial [Member] | Electric Derivative [Member] |  |
Energy Commodity Derivative Volumes [Line Items] |  |
2020 | 262 | 442
2021 | 123 | 0
2022 | 0 | 0
2023 | 0 | 0
2024 | 0 | 0
Thereafter | 0 | 0
Purchase [Member] | Financial [Member] | Gas Derivative [Member] |  |
Energy Commodity Derivative Volumes [Line Items] |  |
2020 | MMBTU | 32,730 | 78,803
2021 | MMBTU | 54,455 | 25,523
2022 | MMBTU | 17,080 | 4,725
2023 | MMBTU | 2,700 | 0
2024 | MMBTU | 0 | 0
Thereafter | MMBTU | 0 | 0
Sales [Member] | Physical [Member] | Electric Derivative [Member] |  |
Energy Commodity Derivative Volumes [Line Items] |  |
2020 | 38 | 133
2021 | 0 | 0
2022 | 0 | 0
2023 | 0 | 0
2024 | 0 | 0
Thereafter | 0 | 0
Sales [Member] | Physical [Member] | Gas Derivative [Member] |  |
Energy Commodity Derivative Volumes [Line Items] |  |
2020 | MMBTU | 2,138 | 2,984
2021 | MMBTU | 2,840 | 1,040
2022 | MMBTU | 0 | 0
2023 | 0 | 0
2024 | 0 | 0
Thereafter | MMBTU | 0 | 0
Sales [Member] | Financial [Member] | Electric Derivative [Member] |  |
Energy Commodity Derivative Volumes [Line Items] |  |
2020 | 409 | 1,724
2021 | 307 | 246
2022 | 0 | 0
2023 | 0 | 0
2024 | 0 | 0
Thereafter | 0 | 0
Sales [Member] | Financial [Member] | Gas Derivative [Member] |  |
Energy Commodity Derivative Volumes [Line Items] |  |
2020 | MMBTU | 12,650 | 37,848
2021 | MMBTU | 34,710 | 13,108
2022 | MMBTU | 6,020 | 675
2023 | MMBTU | 0 | 0
2024 | 0 | 0
Thereafter | MMBTU | 0 | 0

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