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Information By Business Segments (Details) $ in Thousands | 3 Months Ended |
--- | --- | ---
Mar. 31, 2017 USD ($) Reportable_Segments | Mar. 31, 2016 USD ($) | Dec. 31, 2016 USD ($)
Segment Reporting Information [Line Items] |  |  |
Number of Reportable Segments | Reportable_Segments | 2 |  |
Operating revenues | $ 436,470 | $ 418,173 |
Resource costs | 165,586 | 161,719 |
Other operating expenses | 80,663 | 81,604 |
Depreciation and amortization | 42,173 | 39,380 |
Income from operations | 115,386 | 106,085 |
Interest expense | 23,730 | 21,411 |
Income taxes | 33,344 | 30,345 |
Net income from continuing operations attributable to Avista Corp. shareholders | 62,116 | 57,649 |
Payments to Acquire Other Property, Plant, and Equipment | 86,798 | 88,997 |
Total assets | 5,340,359 |  | $ 5,309,755
Intersegment Eliminations [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Operating revenues | 0 | 0 |
Resource costs | 0 | 0 |
Other operating expenses | 0 | 0 |
Depreciation and amortization | 0 | 0 |
Income from operations | 0 | 0 |
Interest expense | (14) | (63) |
Income taxes | 0 | 0 |
Net income from continuing operations attributable to Avista Corp. shareholders | 0 | 0 |
Payments to Acquire Other Property, Plant, and Equipment | 0 | 0 |
Total assets | 0 |  | 0
Operating Segments [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Operating revenues | 430,537 | 412,793 |
Resource costs | 165,586 | 161,719 |
Other operating expenses | 74,484 | 75,779 |
Depreciation and amortization | 41,985 | 39,192 |
Income from operations | 115,820 | 106,718 |
Interest expense | 23,577 | 21,313 |
Income taxes | 33,480 | 30,567 |
Net income from continuing operations attributable to Avista Corp. shareholders | 62,292 | 57,948 |
Payments to Acquire Other Property, Plant, and Equipment | 86,763 | 88,878 |
Total assets | 5,279,509 |  | 5,249,325
Operating Segments [Member] | Avista Utilities [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Operating revenues | 415,381 | 400,147 |
Resource costs | 162,613 | 159,078 |
Other operating expenses | 71,712 | 73,256 |
Depreciation and amortization | 40,538 | 37,866 |
Income from operations | 108,635 | 101,245 |
Interest expense | 22,683 | 20,418 |
Income taxes | 31,017 | 28,672 |
Net income from continuing operations attributable to Avista Corp. shareholders | 58,439 | 54,987 |
Payments to Acquire Other Property, Plant, and Equipment | 85,403 | 84,435 |
Total assets | 5,003,014 |  | 4,975,555
Operating Segments [Member] | Alaska Electric Light & Power [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Operating revenues | 15,156 | 12,646 |
Resource costs | 2,973 | 2,641 |
Other operating expenses | 2,772 | 2,523 |
Depreciation and amortization | 1,447 | 1,326 |
Income from operations | 7,185 | 5,473 |
Interest expense | 894 | 895 |
Income taxes | 2,463 | 1,895 |
Net income from continuing operations attributable to Avista Corp. shareholders | 3,853 | 2,961 |
Payments to Acquire Other Property, Plant, and Equipment | 1,360 | 4,443 |
Total assets | 276,495 |  | 273,770
Operating Segments [Member] | Corporate and Other [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Operating revenues | 5,933 | 5,380 |
Resource costs | 0 | 0 |
Other operating expenses | 6,179 | 5,825 |
Depreciation and amortization | 188 | 188 |
Income from operations | (434) | (633) |
Interest expense | 167 | 161 |
Income taxes | (136) | (222) |
Net income from continuing operations attributable to Avista Corp. shareholders | (176) | (299) |
Payments to Acquire Other Property, Plant, and Equipment | 35 | $ 119 |
Total assets | $ 60,850 |  | $ 60,430

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