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Derivative Accounting (Tables)
 6 Months Ended
Jun. 30, 2016
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 June 30, 2016, we had the following outstanding gross notional volume of derivatives, which represent both purchases and sales (does not reflect net position): 
Commodity
 
Quantity
Power
 
2,291

 
GWh
Gas
 
220

 
Billion cubic feet
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 three and six months ended June 30, 2016 and 2015 (dollars in thousands):
 
 
 
Financial Statement Location
 
Three Months Ended 
 June 30,
 
Six Months Ended 
 June 30,
Commodity Contracts
 
 
2016
 
2015
 
2016
 
2015
Gain (loss) recognized in OCI on derivative instruments (effective portion)
 
OCI — derivative instruments
 
$
208

 
$
41

 
$
60

 
$
(286
)
Loss reclassified from accumulated OCI into income (effective portion realized) (a)
 
Fuel and purchased power (b)
 
(1,016
)
 
(1,430
)
 
(1,957
)
 
(3,773
)

(a)
During the three and six months ended June 30, 2016 and 2015, 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 three and six months ended June 30, 2016 and 2015 (dollars in thousands):
 
 
 
Financial Statement Location
 
Three Months Ended 
 June 30,
 
Six Months Ended
June 30,
Commodity Contracts
 
 
2016
 
2015
 
2016
 
2015
Net gain (loss) recognized in income
 
Operating revenues
 
$
585

 
$
(66
)
 
$
483

 
$
(114
)
Net gain (loss) recognized in income
 
Fuel and purchased power (a)
 
60,894

 
10,613

 
29,958

 
(34,190
)
Total
 
 
 
$
61,479

 
$
10,547

 
$
30,441

 
$
(34,304
)

(a)
Amounts are before the effect of PSA deferrals.
Schedule of 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 June 30, 2016 and December 31, 2015.  These amounts relate to commodity contracts and are located in the assets and liabilities from risk management activities lines of our Condensed Consolidated Balance Sheets.
As of June 30, 2016:
(dollars in thousands)
 
Gross
 Recognized
 Derivatives
 (a)
 
Amounts
Offset
 (b)
 
Net
 Recognized
 Derivatives
 
Other
 (c)
 
Amount Reported on Balance Sheet
Current assets
 
$
30,393

 
$
(14,424
)
 
$
15,969

 
$
707

 
$
16,676

Investments and other assets
 
14,260

 
(8,796
)
 
5,464

 
—

 
5,464

Total assets
 
44,653

 
(23,220
)
 
21,433

 
707

 
22,140

 
 
 
 
 
 
 
 
 
 
 
Current liabilities
 
(65,432
)
 
14,424

 
(51,008
)
 
(4,330
)
 
(55,338
)
Deferred credits and other
 
(61,008
)
 
8,796

 
(52,212
)
 
—

 
(52,212
)
Total liabilities
 
(126,440
)
 
23,220

 
(103,220
)
 
(4,330
)
 
(107,550
)
Total
 
$
(81,787
)
 
$
—

 
$
(81,787
)
 
$
(3,623
)
 
$
(85,410
)

(a)
All of our gross recognized derivative instruments were subject to master netting arrangements.
(b)
Includes cash collateral provided to counterparties of $0.
(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 $4,330, and cash margin provided to counterparties of $707.
 
As of December 31, 2015:
(dollars in thousands)
 
Gross
Recognized
Derivatives
 (a)
 
Amounts
Offset
(b)
 
Net
 Recognized
 Derivatives
 
Other
 (c)
 
Amount
Reported on
Balance Sheet
Current assets
 
$
37,396

 
$
(22,163
)
 
$
15,233

 
$
672

 
$
15,905

Investments and other assets
 
15,960

 
(3,854
)
 
12,106

 
—

 
12,106

Total assets
 
53,356

 
(26,017
)
 
27,339

 
672

 
28,011

 
 
 
 
 
 
 
 
 
 
 
Current liabilities
 
(113,560
)
 
40,223

 
(73,337
)
 
(4,379
)
 
(77,716
)
Deferred credits and other
 
(93,827
)
 
3,854

 
(89,973
)
 
—

 
(89,973
)
Total liabilities
 
(207,387
)
 
44,077

 
(163,310
)
 
(4,379
)
 
(167,689
)
Total
 
$
(154,031
)
 
$
18,060

 
$
(135,971
)
 
$
(3,707
)
 
$
(139,678
)

(a)
All of our gross recognized derivative instruments were subject to master netting arrangements.
(b)
Includes cash collateral provided to counterparties of $18,060.
(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 $4,379, and cash margin provided to counterparties of $672.
Schedule of 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 June 30, 2016 and December 31, 2015.  These amounts relate to commodity contracts and are located in the assets and liabilities from risk management activities lines of our Condensed Consolidated Balance Sheets.
As of June 30, 2016:
(dollars in thousands)
 
Gross
 Recognized
 Derivatives
 (a)
 
Amounts
Offset
 (b)
 
Net
 Recognized
 Derivatives
 
Other
 (c)
 
Amount Reported on Balance Sheet
Current assets
 
$
30,393

 
$
(14,424
)
 
$
15,969

 
$
707

 
$
16,676

Investments and other assets
 
14,260

 
(8,796
)
 
5,464

 
—

 
5,464

Total assets
 
44,653

 
(23,220
)
 
21,433

 
707

 
22,140

 
 
 
 
 
 
 
 
 
 
 
Current liabilities
 
(65,432
)
 
14,424

 
(51,008
)
 
(4,330
)
 
(55,338
)
Deferred credits and other
 
(61,008
)
 
8,796

 
(52,212
)
 
—

 
(52,212
)
Total liabilities
 
(126,440
)
 
23,220

 
(103,220
)
 
(4,330
)
 
(107,550
)
Total
 
$
(81,787
)
 
$
—

 
$
(81,787
)
 
$
(3,623
)
 
$
(85,410
)

(a)
All of our gross recognized derivative instruments were subject to master netting arrangements.
(b)
Includes cash collateral provided to counterparties of $0.
(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 $4,330, and cash margin provided to counterparties of $707.
 
As of December 31, 2015:
(dollars in thousands)
 
Gross
Recognized
Derivatives
 (a)
 
Amounts
Offset
(b)
 
Net
 Recognized
 Derivatives
 
Other
 (c)
 
Amount
Reported on
Balance Sheet
Current assets
 
$
37,396

 
$
(22,163
)
 
$
15,233

 
$
672

 
$
15,905

Investments and other assets
 
15,960

 
(3,854
)
 
12,106

 
—

 
12,106

Total assets
 
53,356

 
(26,017
)
 
27,339

 
672

 
28,011

 
 
 
 
 
 
 
 
 
 
 
Current liabilities
 
(113,560
)
 
40,223

 
(73,337
)
 
(4,379
)
 
(77,716
)
Deferred credits and other
 
(93,827
)
 
3,854

 
(89,973
)
 
—

 
(89,973
)
Total liabilities
 
(207,387
)
 
44,077

 
(163,310
)
 
(4,379
)
 
(167,689
)
Total
 
$
(154,031
)
 
$
18,060

 
$
(135,971
)
 
$
(3,707
)
 
$
(139,678
)

(a)
All of our gross recognized derivative instruments were subject to master netting arrangements.
(b)
Includes cash collateral provided to counterparties of $18,060.
(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 $4,379, and cash margin provided to counterparties of $672.
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 June 30, 2016 (dollars in thousands):
 
June 30, 2016
Aggregate fair value of derivative instruments in a net liability position
$
126,440

Cash collateral posted
—

Additional cash collateral in the event credit-risk-related contingent features were fully triggered (a)
76,949


(a)
This amount is after counterparty netting and includes those contracts which qualify for scope exceptions, which are excluded from the derivative details above.