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Long-Term Debt and Capital Leases Long-Term Debt and Capital Leases (Tables) | 6 Months Ended
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Jun. 30, 2017
Debt Disclosure [Abstract] |
Schedule of Long-term Debt Instruments [Table Text Block] | The following details long-term debt outstanding as of June 30, 2017 and December 31, 2016 (dollars in thousands):
Maturity Year |  | Description |  | Interest Rate |  | June 30, 2017 |  | December 31, 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 |
2051 |  | First Mortgage Bonds |  | 3.54% |  | 175,000 |  |  | 175,000 |
|  | Total Avista Corp. secured long-term debt |  |  |  | 1,621,700 |  |  | 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 |  |  |  | 1,696,700 |  |  | 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 |  |  |  | 1,711,700 |  |  | 1,711,700 |
Other Long-Term Debt Components |  |  |  |  |  |
|  | Capital lease obligations |  |  |  | 63,791 |  |  | 65,435 |
|  | Unamortized debt discount |  |  |  | (709 | ) |  | (792 | )
|  | Unamortized long-term debt issuance costs |  |  |  | (10,204 | ) |  | (10,639 | )
|  | Total |  |  |  | 1,764,578 |  |  | 1,765,704 |
|  | Secured Pollution Control Bonds held by Avista Corporation (1) |  |  |  | (83,700 | ) |  | (83,700 | )
|  | Current portion of long-term debt and capital leases |  |  |  | (277,814 | ) |  | (3,287 | )
|  | Total long-term debt and capital leases |  |  |  | $ | 1,403,064 |  |  | $ | 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.

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