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Fair Value (Tables)
 12 Months Ended
Dec. 31, 2015
Fair Value Disclosures [Abstract]  
Fair Value Inputs, Liabilities, Quantitative Information [Table Text Block]
The following table presents the quantitative information which was used to estimate the fair values of the Level 3 assets and liabilities above as of December 31, 2015 (dollars in thousands):
 
 
Fair Value (Net) at
 
 
 
 
 
 
 
 
December 31, 2015
 
Valuation Technique
 
Unobservable Input
 
Range
Power exchange agreement
 
$
(21,961
)
 
Surrogate facility
pricing
 
O&M charges
 
$33.52-$43.65/MWh (1)
 
 
 
 
Escalation factor
 
3% - 2016 to 2019
 
 
 
 
Transaction volumes
 
233,054 - 397,030 MWhs
Power option agreement

 
(124
)
 
Black-Scholes-
Merton
 
Strike price
 
$35.43/MWh - 2016
 
 
 
 
 
$48.78/MWh - 2019
 
 
 
 
Delivery volumes
 
157,517 - 285,979 MWhs
 
 
 
 
Volatility rates
 
0.20 (2)
Natural gas exchange
agreement
 
(5,039
)
 
Internally derived
weighted average
cost of gas
 
Forward purchase
prices
 
$1.67 - $2.84/mmBTU
 
 
 
 
 
 
 
 
 
Forward sales prices
 
$1.88 - $3.68/mmBTU
 
 
 
 
Purchase volumes
 
115,000 - 310,000 mmBTUs
 
 
 
 
Sales volumes
 
30,000 - 310,000 mmBTUs
(1) The average O&M charges for the delivery year beginning in November 2015 were $39.27 per MWh. For ratemaking purposes the average O&M charges to be included for recovery in retail rates vary slightly between regulatory jurisdictions. The average O&M charges for the delivery year beginning in 2015 are $43.52 for Washington and $39.27 for Idaho.
(2) The estimated volatility rate of 0.20 is compared to actual quoted volatility rates of 0.37 for 2016 to 0.24 in January 2018.
Carrying Value and Estimated Fair Value of Financial Instruments
 
2015
 
2014
 
Carrying
Value
 
Estimated
Fair Value
 
Carrying
Value
 
Estimated
Fair Value
Long-term debt (Level 2)
$
951,000

 
$
1,055,797

 
$
951,000

 
$
1,118,972

Long-term debt (Level 3)
592,000

 
595,018

 
492,000

 
527,663

Snettisham capital lease obligation (Level 3)
64,455

 
63,150

 
69,955

 
79,290

Nonrecourse long-term debt (Level 3)
—

 
—

 
1,431

 
1,440

Long-term debt to affiliated trusts (Level 3)
51,547

 
36,083

 
51,547

 
38,582
Fair Value of Assets And Liabilities Measured on Recurring Basis
 
Level 1
 
Level 2
 
Level 3
 
Counterparty
and Cash
Collateral
Netting (1)
 
Total
December 31, 2015
 
 
 
 
 
 
 
 
 
Assets:
 
 
 
 
 
 
 
 
 
Energy commodity derivatives
$
—

 
$
74,637

 
$
—

 
$
(73,954
)
 
$
683

Level 3 energy commodity derivatives:
 
 
 
 
 
 
 
 
 
Natural gas exchange agreements
—

 
—

 
678

 
(678
)
 
—

Foreign currency derivatives
—

 
2

 
—

 
(2
)
 
—

Interest rate swaps
—

 
1,548

 
—

 
—

 
1,548

Deferred compensation assets:
 
 
 
 
 
 
 
 
 
Fixed income securities (2)
1,727

 
—

 
—

 
—

 
1,727

Equity securities (2)
5,761

 
—

 
—

 
—

 
5,761

Total
$
7,488

 
$
76,187

 
$
678

 
$
(74,634
)
 
$
9,719

Liabilities:
 
 
 
 
 
 
 
 
 
Energy commodity derivatives
$
—

 
$
97,193

 
$
—

 
$
(88,480
)
 
$
8,713

Level 3 energy commodity derivatives:
 
 
 
 
 
 
 
 
 
Natural gas exchange agreement
—

 
—

 
5,717

 
(678
)
 
5,039

Power exchange agreement
—

 
—

 
21,961

 
—

 
21,961

Power option agreement
—

 
—

 
124

 
—

 
124

Interest rate swaps
—

 
85,498

 
—

 
—

 
85,498

Foreign currency derivatives
—

 
19

 
—

 
(2
)
 
17

Total
$
—

 
$
182,710

 
$
27,802

 
$
(89,160
)
 
$
121,352

 
 
 
 
 
 
 
 
 
 
 
Level 1
 
Level 2
 
Level 3
 
Counterparty
and Cash
Collateral
Netting (1)
 
Total
December 31, 2014
 
 
 
 
 
 
 
 
 
Assets:
 
 
 
 
 
 
 
 
 
Energy commodity derivatives
$
—

 
$
96,729

 
$
—

 
$
(95,204
)
 
$
1,525

Level 3 energy commodity derivatives:
 
 
 
 
 
 
 
 
 
Natural gas exchange agreement
—

 
—

 
1,349

 
(1,349
)
 
—

Foreign currency derivatives
—

 
1

 
—

 
(1
)
 
—

Interest rate swaps
—

 
966

 
—

 
(506
)
 
460

Funds held in trust account of Spokane Energy
1,600

 
—

 
—

 
—

 
1,600

Deferred compensation assets:
 
 
 
 
 
 
 
 
 
Fixed income securities (2)
1,793

 
—

 
—

 
—

 
1,793

Equity securities (2)
6,074

 
—

 
—

 
—

 
6,074

Total
$
9,467

 
$
97,696

 
$
1,349

 
$
(97,060
)
 
$
11,452

Liabilities:
 
 
 
 
 
 
 
 
 
Energy commodity derivatives
$
—

 
$
127,094

 
$
—

 
$
(110,714
)
 
$
16,380

Level 3 energy commodity derivatives:
 
 
 
 
 
 
 
 
 
Natural gas exchange agreement
—

 
—

 
1,384

 
(1,349
)
 
35

Power exchange agreement
—

 
—

 
23,299

 
—

 
23,299

Power option agreement
—

 
—

 
424

 
—

 
424

Foreign currency derivatives
—

 
21

 
—

 
(1
)
 
20

Interest rate swaps
—

 
77,568

 
—

 
(29,386
)
 
48,182

Total
$
—

 
$
204,683

 
$
25,107

 
$
(141,450
)
 
$
88,340

(1)
The Company is permitted to net derivative assets and derivative liabilities with the same counterparty when a legally enforceable master netting agreement exists. In addition, the Company nets derivative assets and derivative liabilities against any payables and receivables for cash collateral held or placed with these same counterparties.
(2)
These assets are trading securities and are included in other property and investments-net on the Consolidated Balance Sheets.
Reconciliation for All Assets Measured At Fair Value on a Recurring Basis Using Significant Unobservable Inputs (Level 3)
 
Natural Gas Exchange Agreement
 
Power Exchange Agreement
 
Power Option Agreement
 
Total
Year ended December 31, 2015:
 
 
 
 
 
 
 
Balance as of January 1, 2015
$
(35
)
 
$
(23,299
)
 
$
(424
)
 
$
(23,758
)
Total gains or losses (realized/unrealized):
 
 
 
 
 
 
 
Included in regulatory assets/liabilities (1)
(6,008
)
 
(6,198
)
 
300

 
(11,906
)
Settlements
1,004

 
7,536

 
—

 
8,540

Ending balance as of December 31, 2015 (2)
$
(5,039
)
 
$
(21,961
)
 
$
(124
)
 
$
(27,124
)
Year ended December 31, 2014:
 
 
 
 
 
 
 
Balance as of January 1, 2014
$
(1,219
)
 
$
(14,441
)
 
$
(775
)
 
$
(16,435
)
Total gains or losses (realized/unrealized):
 
 
 
 
 
 
 
Included in regulatory assets/liabilities (1)
3,873

 
(10,002
)
 
351

 
(5,778
)
Settlements
(2,689
)
 
1,144

 
—

 
(1,545
)
Ending balance as of December 31, 2014 (2)
$
(35
)
 
$
(23,299
)
 
$
(424
)
 
$
(23,758
)
Year ended December 31, 2013:
 
 
 
 
 
 
 
Balance as of January 1, 2013
$
(2,379
)
 
$
(18,692
)
 
$
(1,480
)
 
$
(22,551
)
Total gains or losses (realized/unrealized):
 
 
 
 
 
 
 
Included in regulatory assets/liabilities (1)
2,298

 
1,017

 
705

 
4,020

Settlements
(1,138
)
 
3,234

 
—

 
2,096

Ending balance as of December 31, 2013 (2)
$
(1,219
)
 
$
(14,441
)
 
$
(775
)
 
$
(16,435
)

(1)
All gains and losses are included in other regulatory assets and liabilities. There were no gains and losses included in either net income or other comprehensive income during any of the periods presented in the table above.
(2)
There were no purchases, issuances or transfers from other categories of any derivatives instruments during the periods presented in the table above.