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Information By Business Segments (Details) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2018 USD ($) | Jun. 30, 2017 USD ($) | Jun. 30, 2018 USD ($) Reportable_Segments | Jun. 30, 2017 USD ($) | Dec. 31, 2017 USD ($)
Segment Reporting Information [Line Items] |  |  |  |  |
Acquisition costs | $ 983 | $ 1,274 | $ 1,655 | $ 1,274 |
Number of Reportable Segments | Reportable_Segments |  |  | 2 |  |
Operating revenues | 319,298 | 314,501 | $ 728,659 | 750,971 |
Resource costs | 105,969 | 102,751 | 260,587 | 268,337 |
Other operating expenses | 88,604 | 87,202 | 173,398 | 165,824 |
Depreciation and amortization | 45,850 | 42,800 | 90,764 | 84,973 |
Income from operations | 53,279 | 57,946 | 147,485 | 175,373 |
Interest expense | 25,472 | 23,870 | 50,501 | 47,600 |
Income taxes | 5,209 | 13,051 | 15,919 | 46,395 |
Net income from continuing operations attributable to Avista Corp. shareholders | 25,577 | 21,771 | 80,467 | 83,887 |
Payments to Acquire Other Property, Plant, and Equipment | 101,653 | 91,085 | 183,684 | 177,883 |
Total assets | 5,501,780 |  | 5,501,780 |  | $ 5,514,732
Avista Utilities [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Operating revenues | 302,222 |  | 690,976 |  |
Alaska Electric Light & Power [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Operating revenues | 10,482 |  | 24,145 |  |
Corporate and Other [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Operating revenues | 6,594 |  | 13,538 |  |
Intersegment Eliminations [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Operating revenues | 0 | 0 | 0 | 0 |
Resource costs | 0 | 0 | 0 | 0 |
Other operating expenses | 0 | 0 | 0 | 0 |
Depreciation and amortization | 0 | 0 | 0 | 0 |
Income from operations | 0 | 0 | 0 | 0 |
Interest expense | (234) | (27) | (399) | (41) |
Income taxes | 0 | 0 | 0 | 0 |
Net income from continuing operations attributable to Avista Corp. shareholders | 0 | 0 | 0 | 0 |
Payments to Acquire Other Property, Plant, and Equipment | 0 | 0 | 0 | 0 |
Total assets | (26,675) |  | (26,675) |  | (15,075)
Operating Segments [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Operating revenues | 312,704 | 308,729 | 715,121 | 739,266 |
Resource costs | 105,969 | 102,751 | 260,587 | 268,337 |
Other operating expenses | 82,061 | 80,116 | 160,031 | 152,559 |
Depreciation and amortization | 45,651 | 42,643 | 90,384 | 84,628 |
Income from operations | 53,427 | 59,417 | 147,694 | 177,278 |
Interest expense | 25,324 | 23,721 | 50,183 | 47,298 |
Income taxes | 5,181 | 13,967 | 17,062 | 47,447 |
Net income from continuing operations attributable to Avista Corp. shareholders | 25,534 | 23,446 | 84,846 | 85,738 |
Payments to Acquire Other Property, Plant, and Equipment | 101,315 | 90,951 | 183,132 | 177,714 |
Total assets | 5,448,210 |  | 5,448,210 |  | 5,456,566
Operating Segments [Member] | Avista Utilities [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Operating revenues | 302,222 | 296,747 | 690,976 | 712,128 |
Resource costs | 103,022 | 99,461 | 254,687 | 262,074 |
Other operating expenses | 78,848 | 77,121 | 153,987 | 146,792 |
Depreciation and amortization | 44,186 | 41,195 | 87,453 | 81,733 |
Income from operations | 50,848 | 55,820 | 138,993 | 166,496 |
Interest expense | 24,428 | 22,826 | 48,393 | 45,509 |
Income taxes | 4,735 | 12,892 | 15,152 | 43,909 |
Net income from continuing operations attributable to Avista Corp. shareholders | 24,252 | 21,765 | 79,792 | 80,204 |
Payments to Acquire Other Property, Plant, and Equipment | 97,963 | 88,612 | 179,139 | 174,015 |
Total assets | 5,164,670 |  | 5,164,670 |  | 5,177,878
Operating Segments [Member] | Alaska Electric Light & Power [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Operating revenues | 10,482 | 11,982 | 24,145 | 27,138 |
Resource costs | 2,947 | 3,290 | 5,900 | 6,263 |
Other operating expenses | 3,213 | 2,995 | 6,044 | 5,767 |
Depreciation and amortization | 1,465 | 1,448 | 2,931 | 2,895 |
Income from operations | 2,579 | 3,597 | 8,701 | 10,782 |
Interest expense | 896 | 895 | 1,790 | 1,789 |
Income taxes | 446 | 1,075 | 1,910 | 3,538 |
Net income from continuing operations attributable to Avista Corp. shareholders | 1,282 | 1,681 | 5,054 | 5,534 |
Payments to Acquire Other Property, Plant, and Equipment | 3,352 | 2,339 | 3,993 | 3,699 |
Total assets | 283,540 |  | 283,540 |  | 278,688
Operating Segments [Member] | Corporate and Other [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Operating revenues | 6,594 | 5,772 | 13,538 | 11,705 |
Resource costs | 0 | 0 | 0 | 0 |
Other operating expenses | 6,543 | 7,086 | 13,367 | 13,265 |
Depreciation and amortization | 199 | 157 | 380 | 345 |
Income from operations | (148) | (1,471) | (209) | (1,905) |
Interest expense | 382 | 176 | 717 | 343 |
Income taxes | 28 | (916) | (1,143) | (1,052) |
Net income from continuing operations attributable to Avista Corp. shareholders | 43 | (1,675) | (4,379) | (1,851) |
Payments to Acquire Other Property, Plant, and Equipment | 338 | 134 | 552 | 169 |
Total assets | $ 80,245 |  | $ 80,245 |  | $ 73,241
Restatement Adjustment [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) |  | $ 1,800 |  | $ 3,900 |

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