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Information By Business Segments (Details)
$ in Thousands
 3 Months Ended
Mar. 31, 2019
USD ($)
Reportable_Segments
Mar. 31, 2018
USD ($)
Dec. 31, 2018
USD ($)
Segment Reporting Information [Line Items]      
Merger transaction costs $ 19,664 $ 672  
Number of Reportable Segments | Reportable_Segments 2    
Operating revenues $ 396,481 409,361  
Resource costs 137,347 154,618  
Other operating expenses 110,997 84,794  
Depreciation and amortization 49,123 44,914  
Income from operations 67,071 94,206  
Interest expense 26,008 25,029  
Income taxes 30,017 10,710  
Net income from continuing operations attributable to Avista Corp. shareholders 115,794 54,890  
Payments to Acquire Other Property, Plant, and Equipment 93,777 82,031  
Total assets 5,889,983   $ 5,782,576
Assets held for sale 15,874   0
Avista Utilities [Member]      
Segment Reporting Information [Line Items]      
Operating revenues 377,702 388,754  
Alaska Electric Light & Power [Member]      
Segment Reporting Information [Line Items]      
Operating revenues 10,881 13,663  
Corporate and Other [Member]      
Segment Reporting Information [Line Items]      
Operating revenues 7,898 6,944  
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 (440) (165)  
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 (17,865)   (35,528)
Operating Segments [Member]      
Segment Reporting Information [Line Items]      
Operating revenues 388,583 402,417  
Resource costs 137,347 154,618  
Other operating expenses 103,642 77,970  
Depreciation and amortization 48,914 44,733  
Income from operations 66,737 94,267  
Interest expense 25,860 24,859  
Income taxes 29,907 11,881  
Net income from continuing operations attributable to Avista Corp. shareholders 115,453 59,312  
Payments to Acquire Other Property, Plant, and Equipment 93,615 81,817  
Total assets 5,800,450   5,731,054
Operating Segments [Member] | Avista Utilities [Member]      
Segment Reporting Information [Line Items]      
Operating revenues 377,702 388,754  
Resource costs 138,712 151,665  
Other operating expenses 100,583 75,139  
Depreciation and amortization 46,507 43,267  
Income from operations 60,224 88,145  
Interest expense 24,264 23,965  
Income taxes 28,544 10,417  
Net income from continuing operations attributable to Avista Corp. shareholders 111,901 55,540  
Payments to Acquire Other Property, Plant, and Equipment 92,309 81,176  
Total assets 5,524,962   5,458,104
Operating Segments [Member] | Alaska Electric Light & Power [Member]      
Segment Reporting Information [Line Items]      
Operating revenues 10,881 13,663  
Resource costs (1,365) 2,953  
Other operating expenses 3,059 2,831  
Depreciation and amortization 2,407 1,466  
Income from operations 6,513 6,122  
Interest expense 1,596 894  
Income taxes 1,363 1,464  
Net income from continuing operations attributable to Avista Corp. shareholders 3,552 3,772  
Payments to Acquire Other Property, Plant, and Equipment 1,306 641  
Total assets 275,488   272,950
Operating Segments [Member] | Corporate and Other [Member]      
Segment Reporting Information [Line Items]      
Operating revenues 7,898 6,944  
Resource costs 0 0  
Other operating expenses 7,355 6,824  
Depreciation and amortization 209 181  
Income from operations 334 (61)  
Interest expense 588 335  
Income taxes 110 (1,171)  
Net income from continuing operations attributable to Avista Corp. shareholders 341 (4,422)  
Payments to Acquire Other Property, Plant, and Equipment 162 $ 214  
Total assets $ 107,398   $ 87,050