XML 75 R128.htm IDEA: XBRL DOCUMENT
v3.19.3.a.u2

Regulatory Matters Regulatory Matters (Decoupling and Earnings Sharing) (Details) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2019 | Dec. 31, 2018
OREGON | Revenue Subject to Refund [Member] |  |
Schedule of Decoupling and Earnings Sharing [Line Items] |  |
Regulatory Liabilities | $ 0 | $ 0
OREGON | Decoupling [Member] |  |
Schedule of Decoupling and Earnings Sharing [Line Items] |  |
Regulatory Liabilities | (739) | (898)
IDAHO | Decoupling [Member] |  |
Schedule of Decoupling and Earnings Sharing [Line Items] |  |
Regulatory Assets | 2,549 | 2,150
IDAHO | Revenue Subject to Refund [Member] |  |
Schedule of Decoupling and Earnings Sharing [Line Items] |  |
Regulatory Liabilities | $ (686) | (774)
WASHINGTON |  |
Schedule of Decoupling and Earnings Sharing [Line Items] |  |
Decoupling Maximum Rate Increase Request | 3.00% |
WASHINGTON | Decoupling [Member] |  |
Schedule of Decoupling and Earnings Sharing [Line Items] |  |
Regulatory Assets | $ 22,440 | 12,671
WASHINGTON | Revenue Subject to Refund [Member] |  |
Schedule of Decoupling and Earnings Sharing [Line Items] |  |
Regulatory Liabilities | $ 0 | $ (693)

X
- Definition Decoupling Maximum Rate Increase Request + References No definition available. + Details
Name: | ava_DecouplingMaximumRateIncreaseRequest
Namespace Prefix: | ava_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition [Line Items] for Schedule of Decoupling and Earnings Sharing [Table] + References No definition available. + Details
Name: | ava_ScheduleofDecouplingandEarningsSharingLineItems
Namespace Prefix: | ava_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition The amount for the individual regulatory asset as itemized in a table of regulatory assets as of the end of the period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 980 -SubTopic 340 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6499975&loc=d3e44250-110382 + Details
Name: | us-gaap_RegulatoryAssets
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition The amount for the individual regulatory liability as itemized in a table of regulatory liabilities as of the end of the period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 980 -SubTopic 405 -Section 25 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6500807&loc=d3e48068-110394 + Details
Name: | us-gaap_RegulatoryLiabilities
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Details
Name: | us-gaap_StatutoryAccountingPracticesByJurisdictionAxis=stpr_OR
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RegulatoryLiabilityAxis=us-gaap_RevenueSubjectToRefundMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RegulatoryLiabilityAxis=ava_DecouplingMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatutoryAccountingPracticesByJurisdictionAxis=stpr_ID
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RegulatoryAssetAxis=ava_DecouplingMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatutoryAccountingPracticesByJurisdictionAxis=stpr_WA
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |