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Earnings Per Common Share Attributable to Avista Corp. Shareholders (Tables) | 9 Months Ended
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Sep. 30, 2020
Earnings Per Share [Abstract] |
Schedule of Computation of Basic and Diluted Earnings Per Common Share | The following table presents the computation of basic and diluted earnings per common share attributable to Avista Corp. shareholders for the three and nine months ended September 30 (in thousands, except per share amounts):
|  | Three months ended September 30, |  |  | Nine months ended September 30, |
|  | 2020 |  |  | 2019 |  |  | 2020 |  |  | 2019 |
Numerator: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income attributable to Avista Corp. shareholders |  | $ | 4,876 |  |  | $ | 5,090 |  |  | $ | 70,753 |  |  | $ | 146,203 |
Denominator: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted-average number of common shares outstanding-basic |  |  | 68,194 |  |  |  | 66,265 |  |  |  | 67,638 |  |  |  | 65,964 |
Effect of dilutive securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Performance and restricted stock awards |  |  | 143 |  |  |  | 86 |  |  |  | 131 |  |  |  | 86 |
Weighted-average number of common shares outstanding-diluted |  |  | 68,337 |  |  |  | 66,351 |  |  |  | 67,769 |  |  |  | 66,050 |
Earnings per common share attributable to Avista Corp. shareholders: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basic |  | $ | 0.07 |  |  | $ | 0.08 |  |  | $ | 1.05 |  |  | $ | 2.22 |
Diluted |  | $ | 0.07 |  |  | $ | 0.08 |  |  | $ | 1.04 |  |  | $ | 2.21 |

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- Definition Tabular disclosure of an entity's basic and diluted earnings per share calculations, including a reconciliation of numerators and denominators of the basic and diluted per-share computations for income from continuing operations. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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