XML 57 R49.htm IDEA: XBRL DOCUMENT
v3.19.3.a.u2

Energy Purchase Contracts (Tables) | 12 Months Ended
--- | ---
Dec. 31, 2019
Energy Purchase Contracts [Line Items] |
Schedule of Utility Total Expenses |
| 2019 |  | 2018 |  | 2017
Utility power resources | $ | 376,769 |  |  | $ | 357,656 |  |  | $ | 380,523 |
Future Contractual Commitments for Power Resources and Natural Gas Resources |
| 2020 |  | 2021 |  | 2022 |  | 2023 |  | 2024 |  | Thereafter |  | Total
Power resources | $ | 178,546 |  |  | $ | 180,417 |  |  | $ | 179,020 |  |  | $ | 179,640 |  |  | $ | 157,620 |  |  | $ | 1,172,072 |  |  | $ | 2,047,315 |
Natural gas resources | 68,232 |  |  | 50,062 |  |  | 43,577 |  |  | 39,493 |  |  | 36,640 |  |  | 274,302 |  |  | 512,306 |
Total | $ | 246,778 |  |  | $ | 230,479 |  |  | $ | 222,597 |  |  | $ | 219,133 |  |  | $ | 194,260 |  |  | $ | 1,446,374 |  |  | $ | 2,559,621 |
Contractual Obligations [Member] |
Energy Purchase Contracts [Line Items] |
Future Contractual Commitments for Power Resources and Natural Gas Resources |
| 2020 |  | 2021 |  | 2022 |  | 2023 |  | 2024 |  | Thereafter |  | Total
Contractual obligations | $ | 33,116 |  |  | $ | 34,081 |  |  | $ | 24,645 |  |  | $ | 25,190 |  |  | $ | 28,585 |  |  | $ | 191,873 |  |  | $ | 337,490 |

X
- Definition Energy Purchase Contracts [Line Items] + References No definition available. + Details
Name: | ava_EnergyPurchaseContractsLineItems
Namespace Prefix: | ava_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Schedule of the total amount of power purchased, natural gas purchased, fuel for generation and other fuel costs, which are included in utility resource costs in the Consolidated Statements of Income. + References No definition available. + Details
Name: | ava_ScheduleOfUtilityPowerResourcesTableTextBlock
Namespace Prefix: | ava_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure of unconditional purchase obligations that are not recognized as a liability on the balance sheet, including the nature and significant terms of an unconditional purchase obligation; the amount of the fixed and determinable portion of the obligation as of the date of the latest balance sheet presented in the aggregate and, if determinable, for each of the five succeeding fiscal years; the nature of any variable components of the obligation; the amount purchased under the obligation (for example, the take-or-pay or throughput contract) for the reporting period; and may include the amount of imputed interest necessary to reduce the obligation to present value. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 440 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=77896938&loc=d3e25336-109308 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 440 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=77896938&loc=d3e25287-109308 + Details
Name: | us-gaap_UnrecordedUnconditionalPurchaseObligationsDisclosureTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_UnrecordedUnconditionalPurchaseObligationByCategoryOfItemPurchasedAxis=ava_ContractualObligationsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |