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Information by Business Segments - Schedule of Business Segments (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019 | Dec. 31, 2019
Segment Reporting Information [Line Items] |  |  |  |  |
Operating revenues | $ 272,646 | $ 283,770 | $ 941,468 | $ 981,063 |
Resource costs | 78,785 | 98,324 | 276,297 | 324,110 |
Other operating expenses | 87,248 | 81,562 | 269,967 | 286,622 |
Depreciation and amortization | 54,099 | 50,186 | 169,851 | 154,943 |
Income (loss) from operations | 28,498 | 30,243 | 145,617 | 137,082 |
Interest expense | 25,940 | 26,193 | 78,390 | 78,063 |
Income taxes | 859 | (131) | 1,472 | 28,145 |
Net income (loss) attributable to Avista Corp. shareholders | 4,876 | 5,090 | 70,753 | 146,203 |
Capital expenditures | 109,157 | 121,897 | 299,223 | 322,069 |
Total Assets | 6,283,131 |  | 6,283,131 |  | $ 6,082,456
Avista Utilities [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Operating revenues | 263,564 | 274,931 | 909,109 | 942,441 |
Alaska Electric Light & Power [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Operating revenues | 8,815 | 7,790 | 31,014 | 27,414 |
Operating Segments [Member] | Utility Revenue [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Operating revenues | 272,379 | 282,721 | 940,123 | 969,855 |
Resource costs | 78,785 | 98,324 | 276,297 | 324,110 |
Other operating expenses | 85,551 | 80,112 | 266,251 | 271,485 |
Depreciation and amortization | 53,953 | 50,052 | 169,282 | 154,445 |
Income (loss) from operations | 30,074 | 30,778 | 148,556 | 141,509 |
Interest expense | 25,838 | 26,230 | 78,158 | 78,001 |
Income taxes | 1,119 | 207 | 2,300 | 27,547 |
Net income (loss) attributable to Avista Corp. shareholders | 5,814 | 6,163 | 74,121 | 143,911 |
Capital expenditures | 108,354 | 120,977 | 297,834 | 320,965 |
Total Assets | 6,186,397 |  | 6,186,397 |  | 5,984,661
Operating Segments [Member] | Avista Utilities [Member] | Utility Revenue [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Operating revenues | 263,564 | 274,931 | 909,109 | 942,441 |
Resource costs | 77,843 | 98,397 | 274,468 | 325,615 |
Other operating expenses | 82,151 | 76,749 | 256,570 | 261,934 |
Depreciation and amortization | 51,499 | 47,631 | 161,934 | 147,208 |
Income (loss) from operations | 28,284 | 28,998 | 137,219 | 130,200 |
Interest expense | 24,277 | 24,634 | 73,449 | 73,214 |
Income taxes | 1,060 | 125 | 460 | 25,722 |
Net income (loss) attributable to Avista Corp. shareholders | 5,546 | 5,966 | 69,130 | 139,086 |
Capital expenditures | 105,494 | 118,141 | 291,417 | 313,747 |
Total Assets | 5,916,490 |  | 5,916,490 |  | 5,713,268
Operating Segments [Member] | Alaska Electric Light & Power [Member] | Utility Revenue [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Operating revenues | 8,815 | 7,790 | 31,014 | 27,414 |
Resource costs | 942 | (73) | 1,829 | (1,505) |
Other operating expenses | 3,400 | 3,363 | 9,681 | 9,551 |
Depreciation and amortization | 2,454 | 2,421 | 7,348 | 7,237 |
Income (loss) from operations | 1,790 | 1,780 | 11,337 | 11,309 |
Interest expense | 1,561 | 1,596 | 4,709 | 4,787 |
Income taxes | 59 | 82 | 1,840 | 1,825 |
Net income (loss) attributable to Avista Corp. shareholders | 268 | 197 | 4,991 | 4,825 |
Capital expenditures | 2,860 | 2,836 | 6,417 | 7,218 |
Total Assets | 269,907 |  | 269,907 |  | 271,393
Other [Member] | Non-Utility Revenue [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Operating revenues | 267 | 1,049 | 1,345 | 11,208 |
Resource costs | 0 | 0 | 0 | 0 |
Other operating expenses | 1,697 | 1,450 | 3,716 | 15,137 |
Depreciation and amortization | 146 | 134 | 569 | 498 |
Income (loss) from operations | (1,576) | (535) | (2,939) | (4,427) |
Interest expense | 131 | 149 | 393 | 885 |
Income taxes | (260) | (338) | (828) | 598 |
Net income (loss) attributable to Avista Corp. shareholders | (938) | (1,073) | (3,368) | 2,292 |
Capital expenditures | 803 | 920 | 1,389 | 1,104 |
Total Assets | 108,681 |  | 108,681 |  | 113,390
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 (loss) from operations | 0 | 0 | 0 | 0 |
Interest expense | (29) | (186) | (161) | (823) |
Income taxes | 0 | 0 | 0 | 0 |
Net income (loss) attributable to Avista Corp. shareholders | 0 | 0 | 0 | 0 |
Capital expenditures | 0 | $ 0 | 0 | $ 0 |
Total Assets | $ (11,947) |  | $ (11,947) |  | $ (15,595)

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