XML 62 R37.htm IDEA: XBRL DOCUMENT
v3.20.2

Accumulated Other Comprehensive Loss (Tables) | 9 Months Ended
--- | ---
Sep. 30, 2020
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 September 30, 2020 and December 31, 2019 (dollars in thousands):
|  | September 30, 2020 |  |  | December 31, 2019 |
Unfunded benefit obligation for pensions and other postretirement benefit plans - net of taxes of $2,556 and $2,727, respectively |  | $ | 9,614 |  |  | $ | 10,259 |
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 nine months ended September 30 (dollars in thousands).
|  | Amounts Reclassified from Accumulated Other Comprehensive Loss |
|  | Three months ended September 30, |  |  | Nine months ended September 30, |
Details about Accumulated Other Comprehensive Loss Components (Affected Line Item in Statement of Income) |  | 2020 |  |  | 2019 |  |  | 2020 |  |  | 2019 |
Amortization of defined benefit pension items |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amortization of net prior service cost (a) |  | $ | (200 | ) |  | $ | (200 | ) |  | $ | (600 | ) |  | $ | (600 | )
Amortization of net loss (a) |  |  | 3,120 |  |  |  | 3,852 |  |  |  | 9,341 |  |  |  | 11,268 |
Adjustment due to effects of regulation (a) |  |  | (2,642 | ) |  |  | (3,447 | ) |  |  | (7,925 | ) |  |  | (10,057 | )
Total before tax (b) |  |  | 278 |  |  |  | 205 |  |  |  | 816 |  |  |  | 611 |
Tax expense (b) |  |  | (58 | ) |  |  | (43 | ) |  |  | (171 | ) |  |  | (128 | )
Net of tax (b) |  | $ | 220 |  |  | $ | 162 |  |  | $ | 645 |  |  | $ | 483 |
| (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