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Derivative Accounting (Tables)
 12 Months Ended
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.