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Information By Business Segments (Details)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2019
USD ($)
Sep. 30, 2018
USD ($)
Sep. 30, 2019
USD ($)
Reportable_Segments
Sep. 30, 2018
USD ($)
Dec. 31, 2018
USD ($)
Segment Reporting Information [Line Items]          
Number of Reportable Segments | Reportable_Segments     2    
Operating revenues $ 283,770 $ 296,013 $ 981,063 $ 1,024,672  
Resource costs 98,324 101,519 324,110 362,106  
Other operating expenses 81,562 86,707 286,622 260,105  
Depreciation and amortization 50,186 46,242 154,943 137,006  
Income from operations 30,243 36,444 137,082 183,929  
Interest expense 26,193 24,605 78,063 75,106  
Income taxes (131) 1,548 28,145 17,467  
Net income from continuing operations attributable to Avista Corp. shareholders 5,090 10,119 146,203 90,586  
Capital Expenditures 121,897 113,340 322,069 297,024  
Total assets 5,964,783   5,964,783   $ 5,782,576
Avista Utilities [Member]          
Segment Reporting Information [Line Items]          
Operating revenues 274,931 279,549 942,441 970,525  
Alaska Electric Light & Power [Member]          
Segment Reporting Information [Line Items]          
Operating revenues 7,790 9,570 27,414 33,715  
Corporate and Other [Member]          
Segment Reporting Information [Line Items]          
Operating revenues 1,049 6,894 11,208 20,432  
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 (186) (313) (823) (712)  
Income taxes 0 0 0 0  
Net income from continuing operations attributable to Avista Corp. shareholders 0 0 0 0  
Capital Expenditures 0 0 0 0  
Total assets (17,324)   (17,324)   (35,528)
Operating Segments [Member]          
Segment Reporting Information [Line Items]          
Operating revenues 282,721 289,119 969,855 1,004,240  
Resource costs 98,324 101,519 324,110 362,106  
Other operating expenses 80,112 79,360 271,485 239,391  
Depreciation and amortization 50,052 46,035 154,445 136,419  
Income from operations 30,778 37,104 141,509 184,798  
Interest expense 26,230 24,456 78,001 74,639  
Income taxes 207 2,752 27,547 19,814  
Net income from continuing operations attributable to Avista Corp. shareholders 6,163 12,759 143,911 97,605  
Capital Expenditures 120,977 113,083 320,965 296,215  
Total assets 5,874,721   5,874,721   5,731,054
Operating Segments [Member] | Avista Utilities [Member]          
Segment Reporting Information [Line Items]          
Operating revenues 274,931 279,549 942,441 970,525  
Resource costs 98,397 98,461 325,615 353,148  
Other operating expenses 76,749 76,355 261,934 230,342  
Depreciation and amortization 47,631 44,569 147,208 132,022  
Income from operations 28,998 35,317 130,200 174,310  
Interest expense 24,634 23,560 73,214 71,953  
Income taxes 125 2,564 25,722 17,716  
Net income from continuing operations attributable to Avista Corp. shareholders 5,966 11,935 139,086 91,727  
Capital Expenditures 118,141 108,907 313,747 288,046  
Total assets 5,599,103   5,599,103   5,458,104
Operating Segments [Member] | Alaska Electric Light & Power [Member]          
Segment Reporting Information [Line Items]          
Operating revenues 7,790 9,570 27,414 33,715  
Resource costs (73) 3,058 (1,505) 8,958  
Other operating expenses 3,363 3,005 9,551 9,049  
Depreciation and amortization 2,421 1,466 7,237 4,397  
Income from operations 1,780 1,787 11,309 10,488  
Interest expense 1,596 896 4,787 2,686  
Income taxes 82 188 1,825 2,098  
Net income from continuing operations attributable to Avista Corp. shareholders 197 824 4,825 5,878  
Capital Expenditures 2,836 4,176 7,218 8,169  
Total assets 275,618   275,618   272,950
Operating Segments [Member] | Corporate and Other [Member]          
Segment Reporting Information [Line Items]          
Operating revenues 1,049 6,894 11,208 20,432  
Resource costs 0 0 0 0  
Other operating expenses 1,450 7,347 15,137 20,714  
Depreciation and amortization 134 207 498 587  
Income from operations (535) (660) (4,427) (869)  
Interest expense 149 462 885 1,179  
Income taxes (338) (1,204) 598 (2,347)  
Net income from continuing operations attributable to Avista Corp. shareholders (1,073) (2,640) 2,292 (7,019)  
Capital Expenditures 920 $ 257 1,104 $ 809  
Total assets $ 107,386   $ 107,386   $ 87,050