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Derivative Accounting (Tables) | 12 Months Ended
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Dec. 31, 2018
Derivative Instruments and Hedging Activities Disclosure [Abstract] |
Outstanding gross notional amount of derivatives, which represents both purchases and sales (does not reflect net position) | As of December 31, 2018 and 2017, we had the following outstanding gross notional volume of derivatives, which represent both purchases and sales (does not reflect net position):
|  |  | Quantity
Commodity |  | Unit of Measure | December 31, 2018 |  | December 31, 2017
Power |  | GWh | 250 |  |  | 583 |
Gas |  | Billion cubic feet | 218 |  |  | 240 |
Gains and losses from derivative instruments in designated cash flow accounting hedges relationships | The following table provides information about gains and losses from derivative instruments in designated cash flow accounting hedging relationships during the years ended December 31, 2018, 2017 and 2016 (dollars in thousands):
|  | Financial Statement |  | Year Ended December 31,
Commodity Contracts |  | Location |  | 2018 |  | 2017 |  | 2016
Gain (Loss) Recognized in OCI on Derivative Instruments (Effective Portion) |  | OCI — derivative instruments |  | $ | — |  |  | $ | (59 | ) |  | $ | 47 |
Loss Reclassified from Accumulated OCI into Income (Effective Portion Realized) (a) |  | Fuel and purchased power (b) |  | (2,000 | ) |  | (3,519 | ) |  | (3,926 | )
(a) | During the years ended December 31, 2018, 2017, and 2016, we had no losses reclassified from accumulated OCI to earnings related to discontinued cash flow hedges.
(b) Amounts are before the effect of PSA deferrals.
Gains and losses from derivative instruments not designated as accounting hedges instruments | The following table provides information about gains and losses from derivative instruments not designated as accounting hedging instruments during the years ended December 31, 2018, 2017 and 2016 (dollars in thousands):
|  | Financial Statement |  | Year Ended December 31,
Commodity Contracts |  | Location |  | 2018 |  | 2017 |  | 2016
Net Gain (Loss) Recognized in Income |  | Operating revenues |  | $ | (2,557 | ) |  | $ | (1,192 | ) |  | $ | 771 |
Net Gain (Loss) Recognized in Income |  | Fuel and purchased power (a) |  | (12,951 | ) |  | (87,991 | ) |  | 25,711 |
Total |  |  |  | $ | (15,508 | ) |  | $ | (89,183 | ) |  | $ | 26,482 |
(a) Amounts are before the effect of PSA deferrals.
Schedule of the entity's fair value of risk management activities reported on a gross basis and the impacts on offsetting liabilities | The following tables provide information about the fair value of our risk management activities reported on a gross basis, and the impacts of offsetting as of December 31, 2018 and 2017. These amounts relate to commodity contracts and are located in the assets and liabilities from risk management activities lines of our Consolidated Balance Sheets.
As of December 31, 2018: (dollars in thousands) |  | Gross Recognized Derivatives (a) |  | Amounts Offset (b) |  | Net Recognized Derivatives |  | Other (c) |  | Amount Reported on Balance Sheet
Current assets |  | $ | 3,106 |  |  | $ | (2,149 | ) |  | $ | 957 |  |  | $ | 156 |  |  | $ | 1,113 |
Investments and other assets |  | 36 |  |  | (36 | ) |  | — |  |  | — |  |  | — |
Total assets |  | 3,142 |  |  | (2,185 | ) |  | 957 |  |  | 156 |  |  | 1,113 |
Current liabilities |  | (36,345 | ) |  | 2,149 |  |  | (34,196 | ) |  | (1,310 | ) |  | (35,506 | )
Deferred credits and other |  | (24,567 | ) |  | 36 |  |  | (24,531 | ) |  | — |  |  | (24,531 | )
Total liabilities |  | (60,912 | ) |  | 2,185 |  |  | (58,727 | ) |  | (1,310 | ) |  | (60,037 | )
Total |  | $ | (57,770 | ) |  | $ | — |  |  | $ | (57,770 | ) |  | $ | (1,154 | ) |  | $ | (58,924 | )
(a) | All of our gross recognized derivative instruments were subject to master netting arrangements.
(b) | No cash collateral has been provided to counterparties, or received from counterparties, that is subject to offsetting.
(c) | Represents cash collateral and cash margin that is not subject to offsetting. Amounts relate to non-derivative instruments, derivatives qualifying for scope exceptions, or collateral and margin posted in excess of the recognized derivative instrument. Includes cash collateral received from counterparties of $1,310 and cash margin provided to counterparties of $156.
As of December 31, 2017: (dollars in thousands) |  | Gross Recognized Derivatives (a) |  | Amounts Offset (b) |  | Net Recognized Derivatives |  | Other (c) |  | Amount Reported on Balance Sheet
Current assets |  | $ | 5,427 |  |  | $ | (3,796 | ) |  | $ | 1,631 |  |  | $ | 300 |  |  | $ | 1,931 |
Investments and other assets |  | 1,292 |  |  | (1,241 | ) |  | 51 |  |  | — |  |  | 51 |
Total assets |  | 6,719 |  |  | (5,037 | ) |  | 1,682 |  |  | 300 |  |  | 1,982 |
Current liabilities |  | (59,527 | ) |  | 3,796 |  |  | (55,731 | ) |  | (3,521 | ) |  | (59,252 | )
Deferred credits and other |  | (38,411 | ) |  | 1,241 |  |  | (37,170 | ) |  | — |  |  | (37,170 | )
Total liabilities |  | (97,938 | ) |  | 5,037 |  |  | (92,901 | ) |  | (3,521 | ) |  | (96,422 | )
Total |  | $ | (91,219 | ) |  | $ | — |  |  | $ | (91,219 | ) |  | $ | (3,221 | ) |  | $ | (94,440 | )
(a) | All of our gross recognized derivative instruments were subject to master netting arrangements.
(b) | No cash collateral has been provided to counterparties, or received from counterparties, that is subject to offsetting.
(c) Represents cash collateral and cash margin that is not subject to offsetting. Amounts relate to non-derivative instruments, derivatives qualifying for scope exceptions, or collateral and margin posted in excess of the recognized derivative instrument. Includes cash collateral received from counterparties of $3,521 and cash margin provided to counterparties of $300.
Schedule of the entity's fair value of risk management activities reported on a gross basis and the impacts on offsetting assets | The following tables provide information about the fair value of our risk management activities reported on a gross basis, and the impacts of offsetting as of December 31, 2018 and 2017. These amounts relate to commodity contracts and are located in the assets and liabilities from risk management activities lines of our Consolidated Balance Sheets.
As of December 31, 2018: (dollars in thousands) |  | Gross Recognized Derivatives (a) |  | Amounts Offset (b) |  | Net Recognized Derivatives |  | Other (c) |  | Amount Reported on Balance Sheet
Current assets |  | $ | 3,106 |  |  | $ | (2,149 | ) |  | $ | 957 |  |  | $ | 156 |  |  | $ | 1,113 |
Investments and other assets |  | 36 |  |  | (36 | ) |  | — |  |  | — |  |  | — |
Total assets |  | 3,142 |  |  | (2,185 | ) |  | 957 |  |  | 156 |  |  | 1,113 |
Current liabilities |  | (36,345 | ) |  | 2,149 |  |  | (34,196 | ) |  | (1,310 | ) |  | (35,506 | )
Deferred credits and other |  | (24,567 | ) |  | 36 |  |  | (24,531 | ) |  | — |  |  | (24,531 | )
Total liabilities |  | (60,912 | ) |  | 2,185 |  |  | (58,727 | ) |  | (1,310 | ) |  | (60,037 | )
Total |  | $ | (57,770 | ) |  | $ | — |  |  | $ | (57,770 | ) |  | $ | (1,154 | ) |  | $ | (58,924 | )
(a) | All of our gross recognized derivative instruments were subject to master netting arrangements.
(b) | No cash collateral has been provided to counterparties, or received from counterparties, that is subject to offsetting.
(c) | Represents cash collateral and cash margin that is not subject to offsetting. Amounts relate to non-derivative instruments, derivatives qualifying for scope exceptions, or collateral and margin posted in excess of the recognized derivative instrument. Includes cash collateral received from counterparties of $1,310 and cash margin provided to counterparties of $156.
As of December 31, 2017: (dollars in thousands) |  | Gross Recognized Derivatives (a) |  | Amounts Offset (b) |  | Net Recognized Derivatives |  | Other (c) |  | Amount Reported on Balance Sheet
Current assets |  | $ | 5,427 |  |  | $ | (3,796 | ) |  | $ | 1,631 |  |  | $ | 300 |  |  | $ | 1,931 |
Investments and other assets |  | 1,292 |  |  | (1,241 | ) |  | 51 |  |  | — |  |  | 51 |
Total assets |  | 6,719 |  |  | (5,037 | ) |  | 1,682 |  |  | 300 |  |  | 1,982 |
Current liabilities |  | (59,527 | ) |  | 3,796 |  |  | (55,731 | ) |  | (3,521 | ) |  | (59,252 | )
Deferred credits and other |  | (38,411 | ) |  | 1,241 |  |  | (37,170 | ) |  | — |  |  | (37,170 | )
Total liabilities |  | (97,938 | ) |  | 5,037 |  |  | (92,901 | ) |  | (3,521 | ) |  | (96,422 | )
Total |  | $ | (91,219 | ) |  | $ | — |  |  | $ | (91,219 | ) |  | $ | (3,221 | ) |  | $ | (94,440 | )
(a) | All of our gross recognized derivative instruments were subject to master netting arrangements.
(b) | No cash collateral has been provided to counterparties, or received from counterparties, that is subject to offsetting.
(c) | Represents cash collateral and cash margin that is not subject to offsetting. Amounts relate to non-derivative instruments, derivatives qualifying for scope exceptions, or collateral and margin posted in excess of the recognized derivative instrument. Includes cash collateral received from counterparties of $3,521 and cash margin provided to counterparties of $300.
Information about derivative instruments that have credit-risk-related contingent features | The following table provides information about our derivative instruments that have credit-risk-related contingent features at December 31, 2018 (dollars in thousands):
| December 31, 2018
Aggregate fair value of derivative instruments in a net liability position | $ | 60,912 |
Cash collateral posted | — |
Additional cash collateral in the event credit-risk related contingent features were fully triggered (a) | 56,876 |
(a) This amount is after counterparty netting and includes those contracts which qualify for scope exceptions, which are excluded from the derivative details above.

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