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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, 2017 Volt frequency | Dec. 31, 2016 Volt frequency
Sales [Member] | Physical [Member] | Electric Derivative [Member] |  |
Energy Commodity Derivative Volumes [Line Items] |  |
2017 | 149 | 316
2018 | 286 | 286
2019 | 126 | 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 | 4,448 | 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 | 1,101 | 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 | 61,633 | 73,110
2018 | Volt | 33,188 | 15,113
2019 | Volt | 19,598 | 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 | 214 | 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 | 8,891 | 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 | 1,044 | 907
2018 | 246 | 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 | 83,808 | 110,380
2018 | Volt | 64,415 | 52,755
2019 | Volt | 35,623 | 29,475
2020 | Volt | 2,725 | 2,725
2021 | Volt | 0 | 0
Thereafter | Volt | 0 | 0

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