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v3.19.1

Derivatives And Risk Management (Energy Commodity Derivatives) (Details) frequency in Thousands, Volt in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2019 Volt frequency | Dec. 31, 2018 Volt frequency
Sales [Member] | Physical [Member] | Electric Derivative [Member] |  |
Energy Commodity Derivative Volumes [Line Items] |  |
2019 | 109 | 197
2020 | 123 | 123
2021 | 0 | 0
2022 | 0 | 0
2023 | 0 | 0
Thereafter | 0 | 0
Sales [Member] | Physical [Member] | Gas Derivative [Member] |  |
Energy Commodity Derivative Volumes [Line Items] |  |
2019 | Volt | 669 | 2,909
2020 | Volt | 1,430 | 1,430
2021 | Volt | 1,049 | 1,049
2022 | 0 | 0
2023 | 0 | 0
Thereafter | Volt | 0 | 0
Sales [Member] | Financial [Member] | Electric Derivative [Member] |  |
Energy Commodity Derivative Volumes [Line Items] |  |
2019 | 2,280 | 2,790
2020 | 959 | 959
2021 | 246 | 0
2022 | 0 | 0
2023 | 0 | 0
Thereafter | 0 | 0
Sales [Member] | Financial [Member] | Gas Derivative [Member] |  |
Energy Commodity Derivative Volumes [Line Items] |  |
2019 | Volt | 35,913 | 54,418
2020 | Volt | 16,378 | 14,625
2021 | Volt | 4,100 | 4,100
2022 | Volt | 0 | 0
2023 | 0 | 0
Thereafter | Volt | 0 | 0
Purchase [Member] | Physical [Member] | Electric Derivative [Member] |  |
Energy Commodity Derivative Volumes [Line Items] |  |
2019 | 30 | 206
2020 | 0 | 0
2021 | 0 | 0
2022 | 0 | 0
2023 | 0 | 0
Thereafter | 0 | 0
Purchase [Member] | Physical [Member] | Gas Derivative [Member] |  |
Energy Commodity Derivative Volumes [Line Items] |  |
2019 | Volt | 4,640 | 10,732
2020 | Volt | 1,138 | 1,138
2021 | Volt | 0 | 0
2022 | Volt | 0 | 0
2023 | Volt | 0 | 0
Thereafter | Volt | 0 | 0
Purchase [Member] | Financial [Member] | Electric Derivative [Member] |  |
Energy Commodity Derivative Volumes [Line Items] |  |
2019 | 596 | 941
2020 | 0 | 0
2021 | 0 | 0
2022 | 0 | 0
2023 | 0 | 0
Thereafter | 0 | 0
Purchase [Member] | Financial [Member] | Gas Derivative [Member] |  |
Energy Commodity Derivative Volumes [Line Items] |  |
2019 | Volt | 81,438 | 101,293
2020 | Volt | 53,388 | 47,225
2021 | Volt | 15,290 | 9,670
2022 | Volt | 0 | 0
2023 | Volt | 0 | 0
Thereafter | Volt | 0 | 0

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