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Information By Business Segments (Details) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2017 USD ($) | Jun. 30, 2016 USD ($) | Jun. 30, 2017 USD ($) Reportable_Segments | Jun. 30, 2016 USD ($) | Dec. 31, 2016 USD ($)
Segment Reporting Information [Line Items] |  |  |  |  |
Number of Reportable Segments | Reportable_Segments |  |  | 2 |  |
Operating revenues | $ 314,501 | $ 318,838 | $ 750,971 | $ 737,011 |
Resource costs | 102,751 | 109,815 | 268,337 | 271,534 |
Other operating expenses | 89,051 | 84,947 | 169,714 | 166,551 |
Depreciation and amortization | 42,800 | 39,870 | 84,973 | 79,250 |
Income from operations | 56,097 | 61,591 | 171,483 | 167,676 |
Interest expense | 23,870 | 21,472 | 47,600 | 42,883 |
Income taxes | 13,051 | 16,710 | 46,395 | 47,055 |
Net income from continuing operations attributable to Avista Corp. shareholders | 21,771 | 27,254 | 83,887 | 84,903 |
Payments to Acquire Other Property, Plant, and Equipment | 91,085 | 93,983 | 177,883 | 182,980 |
Total assets | 5,373,004 |  | 5,373,004 |  | $ 5,309,755
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 | (27) | (34) | (41) | (97) |
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 | 0 |  | 0 |  | 0
Operating Segments [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Operating revenues | 308,729 | 312,888 | 739,266 | 725,681 |
Resource costs | 102,751 | 109,815 | 268,337 | 271,534 |
Other operating expenses | 81,965 | 78,666 | 156,449 | 154,445 |
Depreciation and amortization | 42,643 | 39,678 | 84,628 | 78,870 |
Income from operations | 57,568 | 62,114 | 173,388 | 168,832 |
Interest expense | 23,721 | 21,357 | 47,298 | 42,670 |
Income taxes | 13,967 | 17,025 | 47,447 | 47,592 |
Net income from continuing operations attributable to Avista Corp. shareholders | 23,446 | 27,829 | 85,738 | 85,777 |
Payments to Acquire Other Property, Plant, and Equipment | 90,951 | 93,937 | 177,714 | 182,815 |
Total assets | 5,313,248 |  | 5,313,248 |  | 5,249,325
Operating Segments [Member] | Avista Utilities [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Operating revenues | 296,747 | 302,641 | 712,128 | 702,788 |
Resource costs | 99,461 | 106,607 | 262,074 | 265,685 |
Other operating expenses | 78,970 | 75,790 | 150,682 | 149,046 |
Depreciation and amortization | 41,195 | 38,351 | 81,733 | 76,217 |
Income from operations | 53,971 | 59,862 | 162,606 | 161,107 |
Interest expense | 22,826 | 20,462 | 45,509 | 40,880 |
Income taxes | 12,892 | 16,349 | 43,909 | 45,021 |
Net income from continuing operations attributable to Avista Corp. shareholders | 21,765 | 26,771 | 80,204 | 81,758 |
Payments to Acquire Other Property, Plant, and Equipment | 88,612 | 88,048 | 174,015 | 172,483 |
Total assets | 5,034,778 |  | 5,034,778 |  | 4,975,555
Operating Segments [Member] | Alaska Electric Light & Power [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Operating revenues | 11,982 | 10,247 | 27,138 | 22,893 |
Resource costs | 3,290 | 3,208 | 6,263 | 5,849 |
Other operating expenses | 2,995 | 2,876 | 5,767 | 5,399 |
Depreciation and amortization | 1,448 | 1,327 | 2,895 | 2,653 |
Income from operations | 3,597 | 2,252 | 10,782 | 7,725 |
Interest expense | 895 | 895 | 1,789 | 1,790 |
Income taxes | 1,075 | 676 | 3,538 | 2,571 |
Net income from continuing operations attributable to Avista Corp. shareholders | 1,681 | 1,058 | 5,534 | 4,019 |
Payments to Acquire Other Property, Plant, and Equipment | 2,339 | 5,889 | 3,699 | 10,332 |
Total assets | 278,470 |  | 278,470 |  | 273,770
Operating Segments [Member] | Corporate and Other [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Operating revenues | 5,772 | 5,950 | 11,705 | 11,330 |
Resource costs | 0 | 0 | 0 | 0 |
Other operating expenses | 7,086 | 6,281 | 13,265 | 12,106 |
Depreciation and amortization | 157 | 192 | 345 | 380 |
Income from operations | (1,471) | (523) | (1,905) | (1,156) |
Interest expense | 176 | 149 | 343 | 310 |
Income taxes | (916) | (315) | (1,052) | (537) |
Net income from continuing operations attributable to Avista Corp. shareholders | (1,675) | (575) | (1,851) | (874) |
Payments to Acquire Other Property, Plant, and Equipment | 134 | $ 46 | 169 | $ 165 |
Total assets | $ 59,756 |  | $ 59,756 |  | $ 60,430

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