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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, 2017 Volt frequency | Dec. 31, 2016 Volt frequency
Sales [Member] | Physical [Member] | Electric Derivative [Member] |  |
Energy Commodity Derivative Volumes [Line Items] |  |
2017 | 154 | 316
2018 | 254 | 286
2019 | 158 | 158
2020 | 0 | 0
2021 | 0 | 0
Thereafter | 0 | 0
Sales [Member] | Physical [Member] | Gas Derivative [Member] |  |
Energy Commodity Derivative Volumes [Line Items] |  |
2017 | Volt | 3,378 | 4,165
2018 | Volt | 1,360 | 1,360
2019 | Volt | 1,345 | 1,345
2020 | 1,430 | 1,430
2021 | 1,049 | 1,060
Thereafter | Volt | 0 | 0
Sales [Member] | Financial [Member] | Electric Derivative [Member] |  |
Energy Commodity Derivative Volumes [Line Items] |  |
2017 | 1,129 | 1,552
2018 | 1,244 | 1,244
2019 | 982 | 982
2020 | 0 | 0
2021 | 0 | 0
Thereafter | 0 | 0
Sales [Member] | Financial [Member] | Gas Derivative [Member] |  |
Energy Commodity Derivative Volumes [Line Items] |  |
2017 | Volt | 43,940 | 73,110
2018 | Volt | 46,805 | 15,113
2019 | Volt | 26,590 | 4,020
2020 | Volt | 0 | 0
2021 | 0 | 0
Thereafter | Volt | 0 | 0
Purchase [Member] | Physical [Member] | Electric Derivative [Member] |  |
Energy Commodity Derivative Volumes [Line Items] |  |
2017 | 185 | 510
2018 | 397 | 397
2019 | 235 | 235
2020 | 0 | 0
2021 | 0 | 0
Thereafter | 0 | 0
Purchase [Member] | Physical [Member] | Gas Derivative [Member] |  |
Energy Commodity Derivative Volumes [Line Items] |  |
2017 | Volt | 7,418 | 15,475
2018 | Volt | 0 | 0
2019 | Volt | 610 | 610
2020 | Volt | 910 | 910
2021 | Volt | 0 | 0
Thereafter | Volt | 0 | 0
Purchase [Member] | Financial [Member] | Electric Derivative [Member] |  |
Energy Commodity Derivative Volumes [Line Items] |  |
2017 | 999 | 907
2018 | 307 | 0
2019 | 737 | 0
2020 | 0 | 0
2021 | 0 | 0
Thereafter | 0 | 0
Purchase [Member] | Financial [Member] | Gas Derivative [Member] |  |
Energy Commodity Derivative Volumes [Line Items] |  |
2017 | Volt | 63,423 | 110,380
2018 | Volt | 78,488 | 52,755
2019 | Volt | 42,775 | 29,475
2020 | Volt | 3,635 | 2,725
2021 | Volt | 0 | 0
Thereafter | Volt | 0 | 0

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