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Information By Business Segments (Details)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2018
USD ($)
Jun. 30, 2017
USD ($)
Jun. 30, 2018
USD ($)
Reportable_Segments
Jun. 30, 2017
USD ($)
Dec. 31, 2017
USD ($)
Segment Reporting Information [Line Items]          
Acquisition costs $ 983 $ 1,274 $ 1,655 $ 1,274  
Number of Reportable Segments | Reportable_Segments     2    
Operating revenues 319,298 314,501 $ 728,659 750,971  
Resource costs 105,969 102,751 260,587 268,337  
Other operating expenses 88,604 87,202 173,398 165,824  
Depreciation and amortization 45,850 42,800 90,764 84,973  
Income from operations 53,279 57,946 147,485 175,373  
Interest expense 25,472 23,870 50,501 47,600  
Income taxes 5,209 13,051 15,919 46,395  
Net income from continuing operations attributable to Avista Corp. shareholders 25,577 21,771 80,467 83,887  
Payments to Acquire Other Property, Plant, and Equipment 101,653 91,085 183,684 177,883  
Total assets 5,501,780   5,501,780   $ 5,514,732
Avista Utilities [Member]          
Segment Reporting Information [Line Items]          
Operating revenues 302,222   690,976    
Alaska Electric Light & Power [Member]          
Segment Reporting Information [Line Items]          
Operating revenues 10,482   24,145    
Corporate and Other [Member]          
Segment Reporting Information [Line Items]          
Operating revenues 6,594   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 (234) (27) (399) (41)  
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 (26,675)   (26,675)   (15,075)
Operating Segments [Member]          
Segment Reporting Information [Line Items]          
Operating revenues 312,704 308,729 715,121 739,266  
Resource costs 105,969 102,751 260,587 268,337  
Other operating expenses 82,061 80,116 160,031 152,559  
Depreciation and amortization 45,651 42,643 90,384 84,628  
Income from operations 53,427 59,417 147,694 177,278  
Interest expense 25,324 23,721 50,183 47,298  
Income taxes 5,181 13,967 17,062 47,447  
Net income from continuing operations attributable to Avista Corp. shareholders 25,534 23,446 84,846 85,738  
Payments to Acquire Other Property, Plant, and Equipment 101,315 90,951 183,132 177,714  
Total assets 5,448,210   5,448,210   5,456,566
Operating Segments [Member] | Avista Utilities [Member]          
Segment Reporting Information [Line Items]          
Operating revenues 302,222 296,747 690,976 712,128  
Resource costs 103,022 99,461 254,687 262,074  
Other operating expenses 78,848 77,121 153,987 146,792  
Depreciation and amortization 44,186 41,195 87,453 81,733  
Income from operations 50,848 55,820 138,993 166,496  
Interest expense 24,428 22,826 48,393 45,509  
Income taxes 4,735 12,892 15,152 43,909  
Net income from continuing operations attributable to Avista Corp. shareholders 24,252 21,765 79,792 80,204  
Payments to Acquire Other Property, Plant, and Equipment 97,963 88,612 179,139 174,015  
Total assets 5,164,670   5,164,670   5,177,878
Operating Segments [Member] | Alaska Electric Light & Power [Member]          
Segment Reporting Information [Line Items]          
Operating revenues 10,482 11,982 24,145 27,138  
Resource costs 2,947 3,290 5,900 6,263  
Other operating expenses 3,213 2,995 6,044 5,767  
Depreciation and amortization 1,465 1,448 2,931 2,895  
Income from operations 2,579 3,597 8,701 10,782  
Interest expense 896 895 1,790 1,789  
Income taxes 446 1,075 1,910 3,538  
Net income from continuing operations attributable to Avista Corp. shareholders 1,282 1,681 5,054 5,534  
Payments to Acquire Other Property, Plant, and Equipment 3,352 2,339 3,993 3,699  
Total assets 283,540   283,540   278,688
Operating Segments [Member] | Corporate and Other [Member]          
Segment Reporting Information [Line Items]          
Operating revenues 6,594 5,772 13,538 11,705  
Resource costs 0 0 0 0  
Other operating expenses 6,543 7,086 13,367 13,265  
Depreciation and amortization 199 157 380 345  
Income from operations (148) (1,471) (209) (1,905)  
Interest expense 382 176 717 343  
Income taxes 28 (916) (1,143) (1,052)  
Net income from continuing operations attributable to Avista Corp. shareholders 43 (1,675) (4,379) (1,851)  
Payments to Acquire Other Property, Plant, and Equipment 338 134 552 169  
Total assets $ 80,245   $ 80,245   $ 73,241
Restatement Adjustment [Member]          
Segment Reporting Information [Line Items]          
Defined Benefit Plan, Net Periodic Benefit Cost (Credit)   $ 1,800   $ 3,900