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Information By Business Segments (Details) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2019 USD ($) | Sep. 30, 2018 USD ($) | Sep. 30, 2019 USD ($) Reportable_Segments | Sep. 30, 2018 USD ($) | Dec. 31, 2018 USD ($)
Segment Reporting Information [Line Items] |  |  |  |  |
Number of Reportable Segments | Reportable_Segments |  |  | 2 |  |
Operating revenues | $ 283,770 | $ 296,013 | $ 981,063 | $ 1,024,672 |
Resource costs | 98,324 | 101,519 | 324,110 | 362,106 |
Other operating expenses | 81,562 | 86,707 | 286,622 | 260,105 |
Depreciation and amortization | 50,186 | 46,242 | 154,943 | 137,006 |
Income from operations | 30,243 | 36,444 | 137,082 | 183,929 |
Interest expense | 26,193 | 24,605 | 78,063 | 75,106 |
Income taxes | (131) | 1,548 | 28,145 | 17,467 |
Net income from continuing operations attributable to Avista Corp. shareholders | 5,090 | 10,119 | 146,203 | 90,586 |
Capital Expenditures | 121,897 | 113,340 | 322,069 | 297,024 |
Total assets | 5,964,783 |  | 5,964,783 |  | $ 5,782,576
Avista Utilities [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Operating revenues | 274,931 | 279,549 | 942,441 | 970,525 |
Alaska Electric Light & Power [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Operating revenues | 7,790 | 9,570 | 27,414 | 33,715 |
Corporate and Other [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Operating revenues | 1,049 | 6,894 | 11,208 | 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 | (186) | (313) | (823) | (712) |
Income taxes | 0 | 0 | 0 | 0 |
Net income from continuing operations attributable to Avista Corp. shareholders | 0 | 0 | 0 | 0 |
Capital Expenditures | 0 | 0 | 0 | 0 |
Total assets | (17,324) |  | (17,324) |  | (35,528)
Operating Segments [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Operating revenues | 282,721 | 289,119 | 969,855 | 1,004,240 |
Resource costs | 98,324 | 101,519 | 324,110 | 362,106 |
Other operating expenses | 80,112 | 79,360 | 271,485 | 239,391 |
Depreciation and amortization | 50,052 | 46,035 | 154,445 | 136,419 |
Income from operations | 30,778 | 37,104 | 141,509 | 184,798 |
Interest expense | 26,230 | 24,456 | 78,001 | 74,639 |
Income taxes | 207 | 2,752 | 27,547 | 19,814 |
Net income from continuing operations attributable to Avista Corp. shareholders | 6,163 | 12,759 | 143,911 | 97,605 |
Capital Expenditures | 120,977 | 113,083 | 320,965 | 296,215 |
Total assets | 5,874,721 |  | 5,874,721 |  | 5,731,054
Operating Segments [Member] | Avista Utilities [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Operating revenues | 274,931 | 279,549 | 942,441 | 970,525 |
Resource costs | 98,397 | 98,461 | 325,615 | 353,148 |
Other operating expenses | 76,749 | 76,355 | 261,934 | 230,342 |
Depreciation and amortization | 47,631 | 44,569 | 147,208 | 132,022 |
Income from operations | 28,998 | 35,317 | 130,200 | 174,310 |
Interest expense | 24,634 | 23,560 | 73,214 | 71,953 |
Income taxes | 125 | 2,564 | 25,722 | 17,716 |
Net income from continuing operations attributable to Avista Corp. shareholders | 5,966 | 11,935 | 139,086 | 91,727 |
Capital Expenditures | 118,141 | 108,907 | 313,747 | 288,046 |
Total assets | 5,599,103 |  | 5,599,103 |  | 5,458,104
Operating Segments [Member] | Alaska Electric Light & Power [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Operating revenues | 7,790 | 9,570 | 27,414 | 33,715 |
Resource costs | (73) | 3,058 | (1,505) | 8,958 |
Other operating expenses | 3,363 | 3,005 | 9,551 | 9,049 |
Depreciation and amortization | 2,421 | 1,466 | 7,237 | 4,397 |
Income from operations | 1,780 | 1,787 | 11,309 | 10,488 |
Interest expense | 1,596 | 896 | 4,787 | 2,686 |
Income taxes | 82 | 188 | 1,825 | 2,098 |
Net income from continuing operations attributable to Avista Corp. shareholders | 197 | 824 | 4,825 | 5,878 |
Capital Expenditures | 2,836 | 4,176 | 7,218 | 8,169 |
Total assets | 275,618 |  | 275,618 |  | 272,950
Operating Segments [Member] | Corporate and Other [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Operating revenues | 1,049 | 6,894 | 11,208 | 20,432 |
Resource costs | 0 | 0 | 0 | 0 |
Other operating expenses | 1,450 | 7,347 | 15,137 | 20,714 |
Depreciation and amortization | 134 | 207 | 498 | 587 |
Income from operations | (535) | (660) | (4,427) | (869) |
Interest expense | 149 | 462 | 885 | 1,179 |
Income taxes | (338) | (1,204) | 598 | (2,347) |
Net income from continuing operations attributable to Avista Corp. shareholders | (1,073) | (2,640) | 2,292 | (7,019) |
Capital Expenditures | 920 | $ 257 | 1,104 | $ 809 |
Total assets | $ 107,386 |  | $ 107,386 |  | $ 87,050

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