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Long-Term Debt Long-Term Debt (Notes)	9 Months Ended
	Sep. 30, 2019
Long-term Debt, Unclassified [Abstract]
Long-term Debt [Text Block]	LONG-TERM DEBT In September 2019, the Company entered into a bond purchase agreement for $180.0 million of 3.43 percent first mortgage bonds due in 2049 through a private offering. The bonds are scheduled to be issued in November 2019 pursuant to the bond purchase agreement. The total net proceeds from the sale of the bonds will be used to repay maturing long-term debt of $90.0 million, repay a portion of the outstanding balance under Avista Corp.'s $400.0 million committed line of credit and for other general corporate purposes. In connection with entering into the bond purchase agreement, the Company cash-settled six interest rate swap derivatives (notional aggregate amount of $70.0 million) and paid a net amount of $13.3 million. See Note 6 for a discussion of interest rate swap derivatives. Because the Company is refinancing short-term debt on a long-term basis, the Company has classified the $90.0 million maturing debt and $87.7 million of the committed line of credit that is expected to be paid off with the net proceeds of the first mortgage bonds as long-term debt.

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- References

No definition available.

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- Definition

The entire disclosure for long-term debt.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-URI http://asc.fasb.org/topic&trid=2208564

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