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Long-Term Debt and Capital Leases (Tables)
 12 Months Ended
Dec. 31, 2017
Debt Instrument [Line Items]  
Schedule of Capital Leases [Table Text Block]
The balances related to the Snettisham capital lease obligation as of December 31 were as follows (dollars in thousands):
 
 
2017
 
2016
Capital lease obligation (1)
 
$
59,745

 
$
62,160

Capital lease asset (2)
 
71,007

 
71,007

Accumulated amortization of capital lease asset (2)
 
12,745

 
9,104

(1)
The capital lease obligation amount is equal to the amount of AIDEA's revenue bonds outstanding.
(2)
These amounts are included in utility plant in service on the Consolidated Balance Sheets.
Interest on the capital lease obligation and amortization of the capital lease asset are included in utility resource costs in the Consolidated Statements of Income and totaled the following amounts for the years ended December 31 (dollars in thousands):
 
2017
 
2016
Interest on capital lease obligation
$
3,042

 
$
3,157

Amortization of capital lease asset
3,641

 
3,642
Schedule of Future Minimum Lease Payments for Capital Leases [Table Text Block]
 
2018
 
2019
 
2020
 
2021
 
2022
 
Thereafter
 
Total
Principal
$
2,535

 
$
2,660

 
$
2,800

 
$
2,935

 
$
3,085

 
$
45,730

 
$
59,745

Interest
2,921

 
2,795

 
2,662

 
2,522

 
2,375

 
14,300

 
27,575

Total
$
5,456

 
$
5,455

 
$
5,462

 
$
5,457

 
$
5,460

 
$
60,030

 
$
87,320
Long-term Debt Outstanding
Maturity
Year
 
Description
 
Interest
Rate
 
2017
 
2016
Avista Corp. Secured Long-Term Debt
 
 
 
 
 
 
2018
 
First Mortgage Bonds
 
5.95%
 
250,000

 
250,000

2018
 
Secured Medium-Term Notes
 
7.39%-7.45%
 
22,500

 
22,500

2019
 
First Mortgage Bonds
 
5.45%
 
90,000

 
90,000

2020
 
First Mortgage Bonds
 
3.89%
 
52,000

 
52,000

2022
 
First Mortgage Bonds
 
5.13%
 
250,000

 
250,000

2023
 
Secured Medium-Term Notes
 
7.18%-7.54%
 
13,500

 
13,500

2028
 
Secured Medium-Term Notes
 
6.37%
 
25,000

 
25,000

2032
 
Secured Pollution Control Bonds (1)
 
(1)
 
66,700

 
66,700

2034
 
Secured Pollution Control Bonds (1)
 
(1)
 
17,000

 
17,000

2035
 
First Mortgage Bonds
 
6.25%
 
150,000

 
150,000

2037
 
First Mortgage Bonds
 
5.70%
 
150,000

 
150,000

2040
 
First Mortgage Bonds
 
5.55%
 
35,000

 
35,000

2041
 
First Mortgage Bonds
 
4.45%
 
85,000

 
85,000

2044
 
First Mortgage Bonds
 
4.11%
 
60,000

 
60,000

2045
 
First Mortgage Bonds
 
4.37%
 
100,000

 
100,000

2047
 
First Mortgage Bonds
 
4.23%
 
80,000

 
80,000

2047
 
First Mortgage Bonds (2)
 
3.91%
 
90,000

 
—

2051
 
First Mortgage Bonds
 
3.54%
 
175,000

 
175,000

 
 
Total Avista Corp. secured long-term debt
 
 
 
1,711,700

 
1,621,700

Alaska Electric Light and Power Company Secured Long-Term Debt
 
 
 
 
 
 
2044
 
First Mortgage Bonds
 
4.54%
 
75,000

 
75,000

 
 
Total secured long-term debt
 
 
 
1,786,700

 
1,696,700

Alaska Energy and Resources Company Unsecured Long-Term Debt
 
 
 
 
 
 
2019
 
Unsecured Term Loan
 
3.85%
 
15,000

 
15,000

 
 
Total secured and unsecured long-term debt
 
 
 
1,801,700

 
1,711,700

Other Long-Term Debt Components
 
 
 
 
 
 
 
 
Capital lease obligations
 
 
 
62,148

 
65,435

 
 
Unamortized debt discount
 
 
 
(626
)
 
(792
)
 
 
Unamortized long-term debt issuance costs
 
 
 
(10,285
)
 
(10,639
)
 
 
Total
 
 
 
1,852,937

 
1,765,704

 
 
Secured Pollution Control Bonds held by Avista Corporation (2)
 
 
 
(83,700
)
 
(83,700
)
 
 
Current portion of long-term debt and capital leases
 
 
 
(277,438
)
 
(3,287
)
 
 
Total long-term debt and capital leases
 
 
 
$
1,491,799

 
$
1,678,717

 
(1)
In December 2010, $66.7 million and $17.0 million of the City of Forsyth, Montana Pollution Control Revenue Refunding Bonds (Avista Corporation Colstrip Project) due in 2032 and 2034, respectively, which had been held by Avista Corp. since 2008 and 2009, respectively, were refunded by new variable rate bond issues (Series 2010A and Series 2010B). The new bonds were not offered to the public and were purchased by Avista Corp. due to market conditions. The Company expects that at a later date, subject to market conditions, these bonds may be remarketed to unaffiliated investors. So long as Avista Corp. is the holder of these bonds, the bonds will not be reflected as an asset or a liability on Avista Corp.'s Consolidated Balance Sheets.
(2)
In December 2017, Avista Corp. issued and sold $90.0 million of 3.91 percent first mortgage bonds due in 2047 pursuant to a bond purchase agreement with institutional investors in the private placement market. The total net proceeds from the sale of the bonds were used to repay a portion of the borrowings outstanding under Avista Corp.’s $400.0 million committed line of credit. In connection with the execution of the bond purchase agreement, Avista Corp. cash-settled five interest rate swap derivatives (notional aggregate amount of $60.0 million) and paid a total of $8.8 million.
Long-term Debt Maturities
 
2018
 
2019
 
2020
 
2021
 
2022
 
Thereafter
 
Total
Debt maturities
$
272,500

 
$
105,000

 
$
52,000

 
$
—

 
$
250,000

 
$
1,090,047

 
$
1,769,547