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Information By Business Segments (Details) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2019 USD ($) | Jun. 30, 2018 USD ($) | Jun. 30, 2019 USD ($) Reportable_Segments | Jun. 30, 2018 USD ($) | Dec. 31, 2018 USD ($)
Segment Reporting Information [Line Items] |  |  |  |  |
Number of Reportable Segments | Reportable_Segments |  |  | 2 |  |
Operating revenues | $ 300,812 | $ 319,298 | $ 697,293 | $ 728,659 |
Resource costs | 88,439 | 105,969 | 225,786 | 260,587 |
Other operating expenses | 94,063 | 88,604 | 205,060 | 173,398 |
Depreciation and amortization | 55,634 | 45,850 | 104,757 | 90,764 |
Income from operations | 39,768 | 53,279 | 106,839 | 147,485 |
Interest expense | 25,862 | 25,472 | 51,870 | 50,501 |
Income taxes | (1,741) | 5,209 | 28,276 | 15,919 |
Net income from continuing operations attributable to Avista Corp. shareholders | 25,319 | 25,577 | 141,113 | 80,467 |
Payments to Acquire Other Property, Plant, and Equipment | 106,395 | 101,653 | 200,172 | 183,684 |
Total assets | 5,877,928 |  | 5,877,928 |  | $ 5,782,576
Avista Utilities [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Operating revenues | 289,808 | 302,222 | 667,510 | 690,976 |
Alaska Electric Light & Power [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Operating revenues | 8,743 | 10,482 | 19,624 | 24,145 |
Corporate and Other [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Operating revenues | 2,261 | 6,594 | 10,159 | 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 | (197) | (234) | (637) | (399) |
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 | (28,288) |  | (28,288) |  | (35,528)
Operating Segments [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Operating revenues | 298,551 | 312,704 | 687,134 | 715,121 |
Resource costs | 88,439 | 105,969 | 225,786 | 260,587 |
Other operating expenses | 87,731 | 82,061 | 191,373 | 160,031 |
Depreciation and amortization | 55,479 | 45,651 | 104,393 | 90,384 |
Income from operations | 43,994 | 53,427 | 110,731 | 147,694 |
Interest expense | 25,911 | 25,324 | 51,771 | 50,183 |
Income taxes | (2,567) | 5,181 | 27,340 | 17,062 |
Net income from continuing operations attributable to Avista Corp. shareholders | 22,295 | 25,534 | 137,748 | 84,846 |
Payments to Acquire Other Property, Plant, and Equipment | 106,373 | 101,315 | 199,988 | 183,132 |
Total assets | 5,798,463 |  | 5,798,463 |  | 5,731,054
Operating Segments [Member] | Avista Utilities [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Operating revenues | 289,808 | 302,222 | 667,510 | 690,976 |
Resource costs | 88,506 | 103,022 | 227,218 | 254,687 |
Other operating expenses | 84,602 | 78,848 | 185,185 | 153,987 |
Depreciation and amortization | 53,070 | 44,186 | 99,577 | 87,453 |
Income from operations | 40,978 | 50,848 | 101,202 | 138,993 |
Interest expense | 24,316 | 24,428 | 48,580 | 48,393 |
Income taxes | (2,947) | 4,735 | 25,597 | 15,152 |
Net income from continuing operations attributable to Avista Corp. shareholders | 21,219 | 24,252 | 133,120 | 79,792 |
Payments to Acquire Other Property, Plant, and Equipment | 103,297 | 97,963 | 195,606 | 179,139 |
Total assets | 5,520,529 |  | 5,520,529 |  | 5,458,104
Operating Segments [Member] | Alaska Electric Light & Power [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Operating revenues | 8,743 | 10,482 | 19,624 | 24,145 |
Resource costs | (67) | 2,947 | (1,432) | 5,900 |
Other operating expenses | 3,129 | 3,213 | 6,188 | 6,044 |
Depreciation and amortization | 2,409 | 1,465 | 4,816 | 2,931 |
Income from operations | 3,016 | 2,579 | 9,529 | 8,701 |
Interest expense | 1,595 | 896 | 3,191 | 1,790 |
Income taxes | 380 | 446 | 1,743 | 1,910 |
Net income from continuing operations attributable to Avista Corp. shareholders | 1,076 | 1,282 | 4,628 | 5,054 |
Payments to Acquire Other Property, Plant, and Equipment | 3,076 | 3,352 | 4,382 | 3,993 |
Total assets | 277,934 |  | 277,934 |  | 272,950
Operating Segments [Member] | Corporate and Other [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Operating revenues | 2,261 | 6,594 | 10,159 | 13,538 |
Resource costs | 0 | 0 | 0 | 0 |
Other operating expenses | 6,332 | 6,543 | 13,687 | 13,367 |
Depreciation and amortization | 155 | 199 | 364 | 380 |
Income from operations | (4,226) | (148) | (3,892) | (209) |
Interest expense | 148 | 382 | 736 | 717 |
Income taxes | 826 | 28 | 936 | (1,143) |
Net income from continuing operations attributable to Avista Corp. shareholders | 3,024 | 43 | 3,365 | (4,379) |
Payments to Acquire Other Property, Plant, and Equipment | 22 | $ 338 | 184 | $ 552 |
Total assets | $ 107,753 |  | $ 107,753 |  | $ 87,050

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