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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, 2018
Long-term Debt, Unclassified [Abstract] |
Schedule of Long-term Debt Instruments [Table Text Block] | The following details long-term debt outstanding as of June 30, 2018 and December 31, 2017 (dollars in thousands):
Maturity Year |  | Description |  | Interest Rate |  | June 30, 2018 |  | December 31, 2017
Avista Corp. Secured Long-Term Debt |  |  |  |  |  |
2018 |  | First Mortgage Bonds |  | 5.95% |  | $ | — |  |  | $ | 250,000 |
2018 |  | Secured Medium-Term Notes |  | 7.39%-7.45% |  | — |  |  | 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 |  | 3.91% |  | 90,000 |  |  | 90,000 |
2048 |  | First Mortgage Bonds (2) |  | 4.35% |  | 375,000 |  |  | — |
2051 |  | First Mortgage Bonds |  | 3.54% |  | 175,000 |  |  | 175,000 |
|  | Total Avista Corp. secured long-term debt |  |  |  | 1,814,200 |  |  | 1,711,700 |
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 |  |  |  | 1,889,200 |  |  | 1,786,700 |
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 |  |  |  | 1,904,200 |  |  | 1,801,700 |
Other Long-Term Debt Components |  |  |  |  |  |
|  | Capital lease obligations |  |  |  | 58,478 |  |  | 62,148 |
|  | Unamortized debt discount |  |  |  | (922 | ) |  | (626 | )
|  | Unamortized long-term debt issuance costs |  |  |  | (13,874 | ) |  | (10,285 | )
|  | Total |  |  |  | 1,947,882 |  |  | 1,852,937 |
|  | Secured Pollution Control Bonds held by Avista Corporation (1) |  |  |  | (83,700 | ) |  | (83,700 | )
|  | Current portion of long-term debt and capital leases |  |  |  | (2,598 | ) |  | (277,438 | )
|  | Total long-term debt and capital leases |  |  |  | $ | 1,861,584 |  |  | $ | 1,491,799 |
(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 Condensed Consolidated Balance Sheets.
(2) | In May 2018, the Company issued and sold $375.0 million of 4.35 percent first mortgage bonds due in 2048 through a public offering. The total net proceeds from the sale of the bonds were used to repay maturing long-term debt of $276.2 million, repay the outstanding balance under Avista Corp.'s $400.0 million committed line of credit and for other general corporate purposes. In connection with the issuance and sale of the first mortgage bonds, the Company cash-settled fourteen interest rate swap derivatives (notional aggregate amount of $275.0 million) and paid a net amount of $25.9 million. See Note 5 for a discussion of interest rate swap derivatives.

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- Definition Tabular disclosure of long-debt instruments or arrangements, including identification, terms, features, collateral requirements and other information necessary to a fair presentation. These are debt arrangements that originally required repayment more than twelve months after issuance or greater than the normal operating cycle of the entity, if longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=84159872&loc=d3e21475-112644 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 470 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=75038535&loc=d3e64711-112823 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(e),(f)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=64930739&loc=d3e28878-108400 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=84159872&loc=d3e21538-112644 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=84159872&loc=d3e21506-112644 Reference 8: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 1A -URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28541-108399 Reference 9: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28551-108399 Reference 10: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=84159872&loc=d3e21521-112644 + Details
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