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Consolidated Statements Of Equity And Redeemable Noncontrolling Interests - USD ($) $ in Thousands | Total | Common Stock [Member] | Accumulated Other Comprehensive Income (Loss) [Member] | Retained Earnings [Member] | Noncontrolling Interests [Member]
--- | --- | --- | --- | --- | ---
Beginning Balance (in shares) at Dec. 31, 2015 |  | 62,312,651 |  |  |
Common Stock, Number of Shares, Par Value and Other Disclosures [Abstract] |  |  |  |  |
Shares issued |  | 1,391,644 |  |  |
Ending Balance (in shares) at Jun. 30, 2016 |  | 63,704,295 |  |  |
Beginning Balance at Dec. 31, 2015 |  | $ 1,004,336 | $ (6,650) | $ 530,940 |
Common Stock, Number of Shares, Par Value and Other Disclosures [Abstract] |  |  |  |  |
Equity compensation expense |  | 3,708 |  |  |
Issuance of common stock, net of issuance costs |  | 47,173 |  |  |
Payment of minimum tax withholdings for share-based payment awards |  | (3,027) |  |  |
Other comprehensive income (loss) | $ (1,089) |  | (1,089) |  |
Net income attributable to Avista Corporation shareholders | 84,903 |  |  | 84,903 |
Cash dividends paid (common stock) |  |  |  | (43,267) |
Ending Balance at Jun. 30, 2016 | $ 1,617,027 | $ 1,052,190 | (7,739) | 572,576 |
Beginning Balance Noncontrolling Interest at Dec. 31, 2015 |  |  |  |  | $ (339)
Common Stock, Number of Shares, Par Value and Other Disclosures [Abstract] |  |  |  |  |
Net income (loss) attributable to noncontrolling interests |  |  |  |  | 49
Ending Balance Noncontrolling Interest at Jun. 30, 2016 |  |  |  |  | (290)
Beginning Balance (in shares) at Dec. 31, 2015 |  | 62,312,651 |  |  |
Ending Balance (in shares) at Dec. 31, 2016 | 64,187,934 | 64,187,934 |  |  |
Beginning Balance at Dec. 31, 2015 |  | $ 1,004,336 | (6,650) | 530,940 |
Ending Balance at Dec. 31, 2016 | $ 1,648,727 | $ 1,075,281 | (7,568) | 581,014 |
Beginning Balance Noncontrolling Interest at Dec. 31, 2015 |  |  |  |  | (339)
Ending Balance Noncontrolling Interest at Dec. 31, 2016 | 251 |  |  |  | (251)
Common Stock, Number of Shares, Par Value and Other Disclosures [Abstract] |  |  |  |  |
Total equity | 1,616,737 |  |  |  |
Total equity | $ 1,648,476 |  |  |  |
Shares issued |  | 221,049 |  |  |
Ending Balance (in shares) at Jun. 30, 2017 | 64,408,983 | 64,408,983 |  |  |
Common Stock, Number of Shares, Par Value and Other Disclosures [Abstract] |  |  |  |  |
Equity compensation expense |  | $ 2,559 |  |  |
Issuance of common stock, net of issuance costs |  | 1,247 |  |  |
Payment of minimum tax withholdings for share-based payment awards |  | (3,420) |  |  |
Other comprehensive income (loss) | $ 366 |  | 366 |  |
Net income attributable to Avista Corporation shareholders | 83,887 |  |  | 83,887 |
Cash dividends paid (common stock) |  |  |  | (46,193) |
Ending Balance at Jun. 30, 2017 | 1,687,173 | $ 1,075,667 | $ (7,202) | $ 618,708 |
Common Stock, Number of Shares, Par Value and Other Disclosures [Abstract] |  |  |  |  |
Net income (loss) attributable to noncontrolling interests |  |  |  |  | (28)
Ending Balance Noncontrolling Interest at Jun. 30, 2017 | 279 |  |  |  | $ (279)
Common Stock, Number of Shares, Par Value and Other Disclosures [Abstract] |  |  |  |  |
Total equity | $ 1,686,894 |  |  |  |

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- Definition The amount of adjustment to stockholders' equity associated with an employee's income tax withholding obligation as part of a net-share settlement of a share-based award. + References No definition available. + Details
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- Definition This element represents the amount of recognized equity-based compensation during the period, that is, the amount recognized as expense in the income statement (or as asset if compensation is capitalized). Alternate captions include the words "stock-based compensation". + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 35 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=66904339&loc=d3e4534-113899 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 20 -Section 55 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=65896087&loc=d3e11149-113907 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 20 -Section 55 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=65896087&loc=d3e11178-113907 + Details
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- Definition Total of all stockholders' equity (deficit) items, net of receivables from officers, directors, owners, and affiliates of the entity which is directly or indirectly attributable to that ownership interest in subsidiary equity which is not attributable to the parent (that is, noncontrolling interest, previously referred to as minority interest). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(22)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(24)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.31) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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