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Derivatives and Risk Management - Schedule of Energy Commodity Derivative Volumes (Details) frequency in Thousands, MWh in Thousands, MMBTU in Thousands | 6 Months Ended | 12 Months Ended
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Jun. 30, 2020 MWh MMBTU frequency | Dec. 31, 2019 MWh MMBTU
Purchase [Member] | Physical [Member] | Electric Derivative [Member] |  |
Energy Commodity Derivative Volumes [Line Items] |  |
2020 | 29 | 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 | 9,325 | 9,813
2021 | MMBTU | 5,480 | 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 | 329 | 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 | 54,560 | 78,803
2021 | MMBTU | 46,425 | 25,523
2022 | MMBTU | 11,300 | 4,725
2023 | MMBTU | 900 | 0
2024 | MMBTU | 0 | 0
Thereafter | MMBTU | 0 | 0
Sales [Member] | Physical [Member] | Electric Derivative [Member] |  |
Energy Commodity Derivative Volumes [Line Items] |  |
2020 | 71 | 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 | 1,441 | 2,984
2021 | MMBTU | 1,940 | 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 | 802 | 1,724
2021 | 246 | 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 | 21,460 | 37,848
2021 | MMBTU | 30,745 | 13,108
2022 | MMBTU | 4,500 | 675
2023 | MMBTU | 0 | 0
2024 | 0 | 0
Thereafter | MMBTU | 0 | 0

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