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Information By Business Segments (Details) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2018 USD ($) | Sep. 30, 2017 USD ($) | Sep. 30, 2018 USD ($) Reportable_Segments | Sep. 30, 2017 USD ($) | Dec. 31, 2017 USD ($)
Segment Reporting Information [Line Items] |  |  |  |  |
Acquisition costs | $ 965 | $ 6,730 | $ 2,620 | $ 8,004 |
Number of Reportable Segments | Reportable_Segments |  |  | 2 |  |
Operating revenues | 296,013 | 297,096 | $ 1,024,672 | 1,048,067 |
Resource costs | 101,519 | 108,568 | 362,106 | 376,905 |
Other operating expenses | 86,707 | 89,255 | 260,105 | 255,079 |
Depreciation and amortization | 46,242 | 43,105 | 137,006 | 128,078 |
Income from operations | 36,444 | 32,899 | 183,929 | 208,272 |
Interest expense | 24,605 | 24,171 | 75,106 | 71,771 |
Income taxes | 1,548 | 5,153 | 17,467 | 51,548 |
Net income from continuing operations attributable to Avista Corp. shareholders | 10,119 | 4,451 | 90,586 | 88,338 |
Payments to Acquire Other Property, Plant, and Equipment | 113,340 | 111,189 | 297,024 | 289,072 |
Total assets | 5,557,398 |  | 5,557,398 |  | $ 5,514,732
Avista Utilities [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Operating revenues | 279,549 |  | 970,525 |  |
Alaska Electric Light & Power [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Operating revenues | 9,570 |  | 33,715 |  |
Corporate and Other [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Operating revenues | 6,894 |  | 20,432 |  |
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 | (313) | (71) | (712) | (112) |
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 | (25,885) |  | (25,885) |  | (15,075)
Operating Segments [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Operating revenues | 289,119 | 291,640 | 1,004,240 | 1,030,906 |
Resource costs | 101,519 | 108,568 | 362,106 | 376,905 |
Other operating expenses | 79,360 | 82,657 | 239,391 | 235,216 |
Depreciation and amortization | 46,035 | 42,968 | 136,419 | 127,596 |
Income from operations | 37,104 | 34,178 | 184,798 | 211,456 |
Interest expense | 24,456 | 24,027 | 74,639 | 71,325 |
Income taxes | 2,752 | 6,016 | 19,814 | 53,463 |
Net income from continuing operations attributable to Avista Corp. shareholders | 12,759 | 5,846 | 97,605 | 91,584 |
Payments to Acquire Other Property, Plant, and Equipment | 113,083 | 110,139 | 296,215 | 287,853 |
Total assets | 5,503,857 |  | 5,503,857 |  | 5,456,566
Operating Segments [Member] | Avista Utilities [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Operating revenues | 279,549 | 280,776 | 970,525 | 992,904 |
Resource costs | 98,461 | 104,516 | 353,148 | 366,590 |
Other operating expenses | 76,355 | 79,188 | 230,342 | 225,980 |
Depreciation and amortization | 44,569 | 41,516 | 132,022 | 123,249 |
Income from operations | 35,317 | 32,880 | 174,310 | 199,376 |
Interest expense | 23,560 | 23,132 | 71,953 | 68,641 |
Income taxes | 2,564 | 5,972 | 17,716 | 49,881 |
Net income from continuing operations attributable to Avista Corp. shareholders | 11,935 | 5,419 | 91,727 | 85,623 |
Payments to Acquire Other Property, Plant, and Equipment | 108,907 | 109,066 | 288,046 | 283,081 |
Total assets | 5,223,031 |  | 5,223,031 |  | 5,177,878
Operating Segments [Member] | Alaska Electric Light & Power [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Operating revenues | 9,570 | 10,864 | 33,715 | 38,002 |
Resource costs | 3,058 | 4,052 | 8,958 | 10,315 |
Other operating expenses | 3,005 | 3,469 | 9,049 | 9,236 |
Depreciation and amortization | 1,466 | 1,452 | 4,397 | 4,347 |
Income from operations | 1,787 | 1,298 | 10,488 | 12,080 |
Interest expense | 896 | 895 | 2,686 | 2,684 |
Income taxes | 188 | 44 | 2,098 | 3,582 |
Net income from continuing operations attributable to Avista Corp. shareholders | 824 | 427 | 5,878 | 5,961 |
Payments to Acquire Other Property, Plant, and Equipment | 4,176 | 1,073 | 8,169 | 4,772 |
Total assets | 280,826 |  | 280,826 |  | 278,688
Operating Segments [Member] | Corporate and Other [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Operating revenues | 6,894 | 5,456 | 20,432 | 17,161 |
Resource costs | 0 | 0 | 0 | 0 |
Other operating expenses | 7,347 | 6,598 | 20,714 | 19,863 |
Depreciation and amortization | 207 | 137 | 587 | 482 |
Income from operations | (660) | (1,279) | (869) | (3,184) |
Interest expense | 462 | 215 | 1,179 | 558 |
Income taxes | (1,204) | (863) | (2,347) | (1,915) |
Net income from continuing operations attributable to Avista Corp. shareholders | (2,640) | (1,395) | (7,019) | (3,246) |
Payments to Acquire Other Property, Plant, and Equipment | 257 | 1,050 | 809 | 1,219 |
Total assets | $ 79,426 |  | $ 79,426 |  | $ 73,241
Restatement Adjustment [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) |  | $ 1,900 |  | $ 5,700 |

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