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Accounting for Derivative Instruments - Volumetric Underlying Derivative Transactions (Details) MWh in Thousands, MMBTU in Thousands | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2015 MWh MMBTU | Dec. 31, 2014 MWh MMBTU
Not Designated as Hedging Instrument | Natural Gas |  |
Derivatives, Fair Value [Line Items] |  |
Net notional volume | 10,131 | 9,690
Not Designated as Hedging Instrument | Natural Gas Basis |  |
Derivatives, Fair Value [Line Items] |  |
Net notional volume | 993 | 2,710
Not Designated as Hedging Instrument | Electricity |  |
Derivatives, Fair Value [Line Items] |  |
Net notional volume | MWh | 1,368 | 607
Designated as Hedging Instrument | Natural Gas |  |
Derivatives, Fair Value [Line Items] |  |
Net notional volume | (160) | 155
Designated as Hedging Instrument | Natural Gas Basis |  |
Derivatives, Fair Value [Line Items] |  |
Net notional volume | 760 | 56

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- Definition Nominal energy measure used to calculate payments on a derivative instrument. + References No definition available. + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Details
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