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Derivatives And Risk Management (Energy Commodity Derivatives) (Details) frequency in Thousands, Volt in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2018 Volt frequency | Dec. 31, 2017 Volt frequency
Sales [Member] | Physical [Member] | Electric Derivative [Member] |  |
Energy Commodity Derivative Volumes [Line Items] |  |
2018 | 162 | 213
2019 | 94 | 94
2020 | 0 | 0
2021 | 0 | 0
2022 | 0 | 0
Thereafter | 0 | 0
Sales [Member] | Physical [Member] | Gas Derivative [Member] |  |
Energy Commodity Derivative Volumes [Line Items] |  |
2018 | Volt | 7,683 | 3,643
2019 | Volt | 1,345 | 1,345
2020 | Volt | 1,430 | 1,430
2021 | 1,049 | 1,049
2022 | 0 | 0
Thereafter | Volt | 0 | 0
Sales [Member] | Financial [Member] | Electric Derivative [Member] |  |
Energy Commodity Derivative Volumes [Line Items] |  |
2018 | 1,537 | 1,739
2019 | 1,543 | 1,420
2020 | 836 | 589
2021 | 0 | 0
2022 | 0 | 0
Thereafter | 0 | 0
Sales [Member] | Financial [Member] | Gas Derivative [Member] |  |
Energy Commodity Derivative Volumes [Line Items] |  |
2018 | Volt | 58,035 | 67,375
2019 | Volt | 35,438 | 35,438
2020 | Volt | 1,830 | 915
2021 | Volt | 0 | 0
2022 | 0 | 0
Thereafter | Volt | 0 | 0
Purchase [Member] | Physical [Member] | Electric Derivative [Member] |  |
Energy Commodity Derivative Volumes [Line Items] |  |
2018 | 246 | 426
2019 | 235 | 235
2020 | 0 | 0
2021 | 0 | 0
2022 | 0 | 0
Thereafter | 0 | 0
Purchase [Member] | Physical [Member] | Gas Derivative [Member] |  |
Energy Commodity Derivative Volumes [Line Items] |  |
2018 | Volt | 13,783 | 10,572
2019 | Volt | 610 | 610
2020 | Volt | 910 | 910
2021 | Volt | 0 | 0
2022 | Volt | 0 | 0
Thereafter | Volt | 0 | 0
Purchase [Member] | Financial [Member] | Electric Derivative [Member] |  |
Energy Commodity Derivative Volumes [Line Items] |  |
2018 | 816 | 763
2019 | 737 | 737
2020 | 0 | 0
2021 | 0 | 0
2022 | 0 | 0
Thereafter | 0 | 0
Purchase [Member] | Financial [Member] | Gas Derivative [Member] |  |
Energy Commodity Derivative Volumes [Line Items] |  |
2018 | Volt | 86,103 | 107,580
2019 | Volt | 65,478 | 61,073
2020 | Volt | 23,145 | 16,590
2021 | Volt | 0 | 0
2022 | Volt | 0 | 0
Thereafter | Volt | 0 | 0

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- Definition Energy Commodity Derivative Expected To Be Settle Year Five + References No definition available. + Details
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- Definition Energy Commodity Derivative Expected To Be Settle Year Four + References No definition available. + Details
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Balance Type: | na
Period Type: | duration

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