XML 59 R34.htm IDEA: XBRL DOCUMENT
v3.21.2

Accumulated Other Comprehensive Loss (Tables) | 6 Months Ended
--- | ---
Jun. 30, 2021
Accumulated Other Comprehensive Loss [Abstract] |
Schedule of Accumulated Other Comprehensive Loss, Net of Tax | Accumulated other comprehensive loss, net of tax, consisted of the following as of June 30, 2021 and December 31, 2020 (dollars in thousands):
|  | June 30, 2021 |  |  | December 31, 2020 |
Unfunded benefit obligation for pensions and other postretirement benefit plans - net of taxes of $3,656 and $3,822, respectively |  | $ | 13,755 |  |  | $ | 14,378 |
Reclassification out of Accumulated Other Comprehensive Income | The following table details the reclassifications out of accumulated other comprehensive loss to net income by component for the three and six months ended June 30 (dollars in thousands):
|  | Amounts Reclassified from Accumulated Other Comprehensive Loss |
|  | Three months ended June 30, |  |  | Six months ended June 30, |
Details about Accumulated Other Comprehensive Loss Components (Affected Line Item in Statement of Income) |  | 2021 |  |  | 2020 |  |  | 2021 |  |  | 2020 |
Amortization of defined benefit pension and postretirement benefit items |  |  |  |  |  |  |  |  |  |  |  |
Amortization of net prior service cost (a) |  | $ | (200 | ) |  | $ | (200 | ) |  | $ | (400 | ) |  | $ | (400 | )
Amortization of net loss (a) |  |  | 2,739 |  |  |  | 3,121 |  |  |  | 5,930 |  |  |  | 6,221 |
Adjustment due to effects of regulation (a) |  |  | (2,149 | ) |  |  | (2,642 | ) |  |  | (4,741 | ) |  |  | (5,283 | )
Total before tax (b) |  |  | 390 |  |  |  | 279 |  |  |  | 789 |  |  |  | 538 |
Tax expense (b) |  |  | (82 | ) |  |  | (59 | ) |  |  | (166 | ) |  |  | (113 | )
Net of tax (b) |  | $ | 308 |  |  | $ | 220 |  |  | $ | 623 |  |  | $ | 425 |
(a) These accumulated other comprehensive loss components are included in the computation of net periodic pension cost (see Note 6 for additional details). (b) Description is also the affected line item on the Condensed Consolidated Statement of Income.

X
- Definition Accumulated Other Comprehensive Loss [Abstract] + References No definition available. + Details
Name: | ava_AccumulatedOtherComprehensiveLossAbstract
Namespace Prefix: | ava_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure of information about items reclassified out of accumulated other comprehensive income (loss). + References No definition available. + Details
Name: | us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure of the components of accumulated other comprehensive income (loss). + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 30 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6450520&loc=d3e32583-110901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=121641772&loc=SL7669686-108580 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 30 -Section 45 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=118261656&loc=d3e32211-110900 + Details
Name: | us-gaap_ScheduleOfAccumulatedOtherComprehensiveIncomeLossTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration