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Information By Business Segments (Details) $ in Thousands | 3 Months Ended |
--- | --- | ---
Mar. 31, 2018 USD ($) Reportable_Segments | Mar. 31, 2017 USD ($) | Dec. 31, 2017 USD ($)
Segment Reporting Information [Line Items] |  |  |
Acquisition costs | $ 672 | $ 0 |
Number of Reportable Segments | Reportable_Segments | 2 |  |
Operating revenues | $ 409,361 | 436,470 |
Resource costs | 154,618 | 165,586 |
Other operating expenses | 84,794 | 78,622 |
Depreciation and amortization | 44,914 | 42,173 |
Income from operations | 94,206 | 117,427 |
Interest expense | 25,029 | 23,730 |
Income taxes | 10,710 | 33,344 |
Net income from continuing operations attributable to Avista Corp. shareholders | 54,890 | 62,116 |
Payments to Acquire Other Property, Plant, and Equipment | 82,031 | 86,798 |
Total assets | 5,485,183 |  | $ 5,514,732
Avista Utilities [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Operating revenues | 388,754 |  |
Alaska Electric Light & Power [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Operating revenues | 13,663 |  |
Corporate and Other [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Operating revenues | 6,944 |  |
Intersegment Eliminations [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Operating revenues | 0 | 0 |
Resource costs | 0 | 0 |
Other operating expenses | 0 | 0 |
Depreciation and amortization | 0 | 0 |
Income from operations | 0 | 0 |
Interest expense | (165) | (14) |
Income taxes | 0 | 0 |
Net income from continuing operations attributable to Avista Corp. shareholders | 0 | 0 |
Payments to Acquire Other Property, Plant, and Equipment | 0 | 0 |
Total assets | (22,951) |  | (15,075)
Operating Segments [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Operating revenues | 402,417 | 430,537 |
Resource costs | 154,618 | 165,586 |
Other operating expenses | 77,970 | 72,443 |
Depreciation and amortization | 44,733 | 41,985 |
Income from operations | 94,267 | 117,861 |
Interest expense | 24,859 | 23,577 |
Income taxes | 11,881 | 33,480 |
Net income from continuing operations attributable to Avista Corp. shareholders | 59,312 | 62,292 |
Payments to Acquire Other Property, Plant, and Equipment | 81,817 | 86,763 |
Total assets | 5,432,390 |  | 5,456,566
Operating Segments [Member] | Avista Utilities [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Operating revenues | 388,754 | 415,381 |
Resource costs | 151,665 | 162,613 |
Other operating expenses | 75,139 | 69,671 |
Depreciation and amortization | 43,267 | 40,538 |
Income from operations | 88,145 | 110,676 |
Interest expense | 23,965 | 22,683 |
Income taxes | 10,417 | 31,017 |
Net income from continuing operations attributable to Avista Corp. shareholders | 55,540 | 58,439 |
Payments to Acquire Other Property, Plant, and Equipment | 81,176 | 85,403 |
Total assets | 5,149,906 |  | 5,177,878
Operating Segments [Member] | Alaska Electric Light & Power [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Operating revenues | 13,663 | 15,156 |
Resource costs | 2,953 | 2,973 |
Other operating expenses | 2,831 | 2,772 |
Depreciation and amortization | 1,466 | 1,447 |
Income from operations | 6,122 | 7,185 |
Interest expense | 894 | 894 |
Income taxes | 1,464 | 2,463 |
Net income from continuing operations attributable to Avista Corp. shareholders | 3,772 | 3,853 |
Payments to Acquire Other Property, Plant, and Equipment | 641 | 1,360 |
Total assets | 282,484 |  | 278,688
Operating Segments [Member] | Corporate and Other [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Operating revenues | 6,944 | 5,933 |
Resource costs | 0 | 0 |
Other operating expenses | 6,824 | 6,179 |
Depreciation and amortization | 181 | 188 |
Income from operations | (61) | (434) |
Interest expense | 335 | 167 |
Income taxes | (1,171) | (136) |
Net income from continuing operations attributable to Avista Corp. shareholders | (4,422) | (176) |
Payments to Acquire Other Property, Plant, and Equipment | 214 | 35 |
Total assets | $ 75,744 |  | $ 73,241
Restatement Adjustment [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) |  | $ 2,000 |

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