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Information By Business Segments (Details) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2019 USD ($) | Sep. 30, 2019 USD ($) | Jun. 30, 2019 USD ($) | Mar. 31, 2019 USD ($) | Dec. 31, 2018 USD ($) | Sep. 30, 2018 USD ($) | Jun. 30, 2018 USD ($) | Mar. 31, 2018 USD ($) | Dec. 31, 2019 USD ($) Reportable_Segments | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($)
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Number of Reportable Segments | Reportable_Segments |  |  |  |  |  |  |  |  | 2 |  |
Operating revenues | $ 364,559 | $ 283,770 | $ 300,812 | $ 396,481 | $ 372,221 | $ 296,013 | $ 319,298 | $ 409,361 | $ 1,345,622 | $ 1,396,893 | $ 1,445,929
Resource costs |  |  |  |  |  |  |  |  | 439,817 | 494,736 | 524,566
Other operating expenses |  |  |  |  |  |  |  |  | 383,770 | 350,073 | 350,411
Depreciation and amortization |  |  |  |  |  |  |  |  | 205,994 | 183,676 | 172,021
Income from operations | 73,307 | $ 30,243 | $ 39,768 | $ 67,071 | 77,184 | $ 36,444 | $ 53,279 | $ 94,206 | 210,389 | 261,113 | 292,179
Interest expense |  |  |  |  |  |  |  |  | 104,354 | 100,936 | 96,192
Total income tax expense |  |  |  |  |  |  |  |  | 31,374 | 26,060 | 82,758
Payments to Acquire Other Property, Plant, and Equipment |  |  |  |  |  |  |  |  | 443,345 | 425,241 | 416,619
Total assets | 6,082,456 |  |  |  | 5,782,576 |  |  |  | 6,082,456 | 5,782,576 | 5,514,732
Income (Loss) from Continuing Operations Attributable to Parent |  |  |  |  |  |  |  |  | 196,979 | 136,429 | 115,916
Non-service portion of pension and other postretirement benefit expenses |  |  |  |  |  |  |  |  | 8,899 | 5,156 | 7,670
Avista Utilities [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Operating revenues |  |  |  |  |  |  |  |  | 1,295,873 | 1,325,966 |
Alaska Electric Light & Power [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Operating revenues |  |  |  |  |  |  |  |  | 37,265 | 43,599 |
Corporate and Other [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Operating revenues |  |  |  |  |  |  |  |  | 12,484 | 27,328 |
Operating Segments [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Operating revenues |  |  |  |  |  |  |  |  | 1,333,138 | 1,369,565 | 1,423,386
Resource costs |  |  |  |  |  |  |  |  | 439,817 | 494,736 | 524,566
Other operating expenses |  |  |  |  |  |  |  |  | 364,887 | 321,992 | 324,761
Depreciation and amortization |  |  |  |  |  |  |  |  | 205,365 | 182,877 | 171,281
Income from operations |  |  |  |  |  |  |  |  | 217,417 | 262,665 | 296,026
Interest expense |  |  |  |  |  |  |  |  | 104,251 | 100,322 | 95,600
Total income tax expense |  |  |  |  |  |  |  |  | 31,179 | 28,353 | 83,098
Payments to Acquire Other Property, Plant, and Equipment |  |  |  |  |  |  |  |  | 442,510 | 424,350 | 412,339
Total assets | 5,984,661 |  |  |  | 5,731,054 |  |  |  | 5,984,661 | 5,731,054 | 5,456,566
Income (Loss) from Continuing Operations Attributable to Parent |  |  |  |  |  |  |  |  | 191,435 | 143,166 | 123,770
Operating Segments [Member] | Avista Utilities [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Operating revenues |  |  |  |  |  |  |  |  | 1,295,873 | 1,325,966 | 1,370,359
Resource costs |  |  |  |  |  |  |  |  | 442,471 | 485,231 | 511,163
Other operating expenses |  |  |  |  |  |  |  |  | 352,170 | 309,501 | 312,229
Depreciation and amortization |  |  |  |  |  |  |  |  | 195,697 | 177,006 | 165,478
Income from operations |  |  |  |  |  |  |  |  | 200,994 | 248,000 | 278,079
Interest expense |  |  |  |  |  |  |  |  | 97,866 | 96,738 | 92,019
Total income tax expense |  |  |  |  |  |  |  |  | 28,363 | 25,259 | 77,583
Payments to Acquire Other Property, Plant, and Equipment |  |  |  |  |  |  |  |  | 434,077 | 418,741 | 405,938
Total assets | 5,713,268 |  |  |  | 5,458,104 |  |  |  | 5,713,268 | 5,458,104 | 5,177,878
Income (Loss) from Continuing Operations Attributable to Parent |  |  |  |  |  |  |  |  | 183,977 | 134,874 | 114,716
Operating Segments [Member] | Alaska Electric Light & Power [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Operating revenues |  |  |  |  |  |  |  |  | 37,265 | 43,599 | 53,027
Resource costs |  |  |  |  |  |  |  |  | (2,654) | 9,505 | 13,403
Other operating expenses |  |  |  |  |  |  |  |  | 12,717 | 12,491 | 12,532
Depreciation and amortization |  |  |  |  |  |  |  |  | 9,668 | 5,871 | 5,803
Income from operations |  |  |  |  |  |  |  |  | 16,423 | 14,665 | 17,947
Interest expense |  |  |  |  |  |  |  |  | 6,385 | 3,584 | 3,581
Total income tax expense |  |  |  |  |  |  |  |  | 2,816 | 3,094 | 5,515
Payments to Acquire Other Property, Plant, and Equipment |  |  |  |  |  |  |  |  | 8,433 | 5,609 | 6,401
Total assets | 271,393 |  |  |  | 272,950 |  |  |  | 271,393 | 272,950 | 278,688
Income (Loss) from Continuing Operations Attributable to Parent |  |  |  |  |  |  |  |  | 7,458 | 8,292 | 9,054
Operating Segments [Member] | Corporate and Other [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Operating revenues |  |  |  |  |  |  |  |  | 12,484 | 27,328 | 22,543
Resource costs |  |  |  |  |  |  |  |  | 0 | 0 | 0
Other operating expenses |  |  |  |  |  |  |  |  | 18,883 | 28,081 | 25,650
Depreciation and amortization |  |  |  |  |  |  |  |  | 629 | 799 | 740
Income from operations |  |  |  |  |  |  |  |  | (7,028) | (1,552) | (3,847)
Interest expense |  |  |  |  |  |  |  |  | 1,032 | 1,694 | 781
Total income tax expense |  |  |  |  |  |  |  |  | 195 | (2,293) | (340)
Payments to Acquire Other Property, Plant, and Equipment |  |  |  |  |  |  |  |  | 835 | 891 | 4,280
Total assets | 113,390 |  |  |  | 87,050 |  |  |  | 113,390 | 87,050 | 73,241
Income (Loss) from Continuing Operations Attributable to Parent |  |  |  |  |  |  |  |  | 5,544 | (6,737) | (7,854)
Intersegment Eliminations [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Operating revenues |  |  |  |  |  |  |  |  | 0 | 0 | 0
Resource costs |  |  |  |  |  |  |  |  | 0 | 0 | 0
Other operating expenses |  |  |  |  |  |  |  |  | 0 | 0 | 0
Depreciation and amortization |  |  |  |  |  |  |  |  | 0 | 0 | 0
Income from operations |  |  |  |  |  |  |  |  | 0 | 0 | 0
Interest expense |  |  |  |  |  |  |  |  | (929) | (1,080) | (189)
Total income tax expense |  |  |  |  |  |  |  |  | 0 | 0 | 0
Payments to Acquire Other Property, Plant, and Equipment |  |  |  |  |  |  |  |  | 0 | 0 | 0
Total assets | $ (15,595) |  |  |  | $ (35,528) |  |  |  | (15,595) | (35,528) | (15,075)
Income (Loss) from Continuing Operations Attributable to Parent |  |  |  |  |  |  |  |  | $ 0 | $ 0 | $ 0

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