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Derivatives And Risk Management (Energy Commodity Derivatives) (Details) frequency in Thousands, Volt in Thousands | 6 Months Ended | 12 Months Ended
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Jun. 30, 2018 Volt frequency | Dec. 31, 2017 Volt frequency
Sales [Member] | Physical [Member] | Electric Derivative [Member] |  |
Energy Commodity Derivative Volumes [Line Items] |  |
2018 | 153 | 213
2019 | 156 | 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 | 3,699 | 3,643
2019 | Volt | 1,795 | 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 | 967 | 1,739
2019 | 1,912 | 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 | 39,963 | 67,375
2019 | Volt | 40,363 | 35,438
2020 | Volt | 3,500 | 915
2021 | Volt | 450 | 0
2022 | 0 | 0
Thereafter | Volt | 0 | 0
Purchase [Member] | Physical [Member] | Electric Derivative [Member] |  |
Energy Commodity Derivative Volumes [Line Items] |  |
2018 | 140 | 426
2019 | 173 | 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 | 8,399 | 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 | 450 | 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 | 65,063 | 107,580
2019 | Volt | 73,923 | 61,073
2020 | Volt | 27,265 | 16,590
2021 | Volt | 2,250 | 0
2022 | Volt | 0 | 0
Thereafter | Volt | 0 | 0

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