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Revenue Revenue Disaggregation of Revenue (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Disaggregation of Revenue [Line Items]        
Revenues $ 300,812 $ 319,298 $ 697,293 $ 728,659
Residential Electric [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from Contract with Customer, Including Assessed Tax 76,610 78,973 197,855 200,264
Commercial and Governmental Electric [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from Contract with Customer, Including Assessed Tax 81,212 83,003 165,279 169,956
Industrial Electric [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from Contract with Customer, Including Assessed Tax 26,245 27,985 51,493 53,104
Public Street and Highway Lighting Electric [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from Contract with Customer, Including Assessed Tax 1,956 1,962 3,922 3,889
Total Retail Electric [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from Contract with Customer, Including Assessed Tax 186,023 191,923 418,549 427,213
Electric Transmission [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from Contract with Customer, Including Assessed Tax 4,250 4,171 9,402 8,001
Other Electric [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from Contract with Customer, Including Assessed Tax 4,379 3,919 12,573 10,210
Total Electric [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from Contract with Customer, Including Assessed Tax 194,652 200,013 440,524 445,424
Residential Natural Gas [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from Contract with Customer, Including Assessed Tax 27,937 30,767 105,272 111,421
Commercial Natural Gas [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from Contract with Customer, Including Assessed Tax 13,369 14,668 49,964 52,040
Industrial and Interruptible Natural Gas [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from Contract with Customer, Including Assessed Tax 1,103 1,078 2,730 2,761
Total Retail Natural Gas [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from Contract with Customer, Including Assessed Tax 42,409 46,513 157,966 166,222
Transportation Natural Gas [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from Contract with Customer, Including Assessed Tax 2,039 2,221 4,523 4,788
Other Natural Gas [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from Contract with Customer, Including Assessed Tax 1,125 1,125 2,250 2,250
Total Natural Gas [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from Contract with Customer, Including Assessed Tax 45,573 49,859 164,739 173,260
Avista Utilities [Member]        
Disaggregation of Revenue [Line Items]        
Revenues 289,808 302,222 667,510 690,976
Avista Utilities [Member] | Residential Electric [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from Contract with Customer, Including Assessed Tax 72,886 74,818 188,279 189,571
Avista Utilities [Member] | Commercial and Governmental Electric [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from Contract with Customer, Including Assessed Tax 76,375 76,462 155,621 155,371
Avista Utilities [Member] | Industrial Electric [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from Contract with Customer, Including Assessed Tax 26,245 27,985 51,493 53,104
Avista Utilities [Member] | Public Street and Highway Lighting Electric [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from Contract with Customer, Including Assessed Tax 1,897 1,899 3,800 3,758
Avista Utilities [Member] | Total Retail Electric [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from Contract with Customer, Including Assessed Tax 177,403 181,164 399,193 401,804
Avista Utilities [Member] | Electric Transmission [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from Contract with Customer, Including Assessed Tax 4,250 4,171 9,402 8,001
Avista Utilities [Member] | Other Electric [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from Contract with Customer, Including Assessed Tax 4,379 3,919 12,573 10,210
Avista Utilities [Member] | Total Electric [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from Contract with Customer, Including Assessed Tax 186,032 189,254 421,168 420,015
Avista Utilities [Member] | Residential Natural Gas [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from Contract with Customer, Including Assessed Tax 27,937 30,767 105,272 111,421
Avista Utilities [Member] | Commercial Natural Gas [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from Contract with Customer, Including Assessed Tax 13,369 14,668 49,964 52,040
Avista Utilities [Member] | Industrial and Interruptible Natural Gas [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from Contract with Customer, Including Assessed Tax 1,103 1,078 2,730 2,761
Avista Utilities [Member] | Total Retail Natural Gas [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from Contract with Customer, Including Assessed Tax 42,409 46,513 157,966 166,222
Avista Utilities [Member] | Transportation Natural Gas [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from Contract with Customer, Including Assessed Tax 2,039 2,221 4,523 4,788
Avista Utilities [Member] | Other Natural Gas [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from Contract with Customer, Including Assessed Tax 1,125 1,125 2,250 2,250
Avista Utilities [Member] | Total Natural Gas [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from Contract with Customer, Including Assessed Tax 45,573 49,859 164,739 173,260
Avista Utilities [Member] | Revenue from contracts with customers        
Disaggregation of Revenue [Line Items]        
Revenues 231,605 239,113 585,907 593,275
Avista Utilities [Member] | Derivative revenues        
Disaggregation of Revenue [Line Items]        
Revenues 42,128 56,357 66,255 114,749
Avista Utilities [Member] | Alternative Revenue Programs [Member]        
Disaggregation of Revenue [Line Items]        
Revenues 9,725 3,570 5,067 (2,369)
Avista Utilities [Member] | Deferrals and amortizations for rate refunds to customers        
Disaggregation of Revenue [Line Items]        
Revenues 2,512 982 4,647 (18,840)
Avista Utilities [Member] | Other utility revenues        
Disaggregation of Revenue [Line Items]        
Revenues 3,838 2,200 5,634 4,161
Alaska Electric Light & Power [Member]        
Disaggregation of Revenue [Line Items]        
Revenues 8,743 10,482 19,624 24,145
Alaska Electric Light & Power [Member] | Residential Electric [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from Contract with Customer, Including Assessed Tax 3,724 4,155 9,576 10,693
Alaska Electric Light & Power [Member] | Commercial and Governmental Electric [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from Contract with Customer, Including Assessed Tax 4,837 6,541 9,658 14,585
Alaska Electric Light & Power [Member] | Industrial Electric [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from Contract with Customer, Including Assessed Tax 0 0 0 0
Alaska Electric Light & Power [Member] | Public Street and Highway Lighting Electric [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from Contract with Customer, Including Assessed Tax 59 63 122 131
Alaska Electric Light & Power [Member] | Total Retail Electric [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from Contract with Customer, Including Assessed Tax 8,620 10,759 19,356 25,409
Alaska Electric Light & Power [Member] | Electric Transmission [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from Contract with Customer, Including Assessed Tax 0 0 0 0
Alaska Electric Light & Power [Member] | Other Electric [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from Contract with Customer, Including Assessed Tax 0 0 0 0
Alaska Electric Light & Power [Member] | Total Electric [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from Contract with Customer, Including Assessed Tax 8,620 10,759 19,356 25,409
Alaska Electric Light & Power [Member] | Residential Natural Gas [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from Contract with Customer, Including Assessed Tax 0 0 0 0
Alaska Electric Light & Power [Member] | Commercial Natural Gas [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from Contract with Customer, Including Assessed Tax 0 0 0 0
Alaska Electric Light & Power [Member] | Industrial and Interruptible Natural Gas [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from Contract with Customer, Including Assessed Tax 0 0 0 0
Alaska Electric Light & Power [Member] | Total Retail Natural Gas [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from Contract with Customer, Including Assessed Tax 0 0 0 0
Alaska Electric Light & Power [Member] | Transportation Natural Gas [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from Contract with Customer, Including Assessed Tax 0 0 0 0
Alaska Electric Light & Power [Member] | Other Natural Gas [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from Contract with Customer, Including Assessed Tax 0 0 0 0
Alaska Electric Light & Power [Member] | Total Natural Gas [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from Contract with Customer, Including Assessed Tax 0 0 0 0
Alaska Electric Light & Power [Member] | Revenue from contracts with customers        
Disaggregation of Revenue [Line Items]        
Revenues 8,620 10,759 19,356 25,409
Alaska Electric Light & Power [Member] | Deferrals and amortizations for rate refunds to customers        
Disaggregation of Revenue [Line Items]        
Revenues (47) (427) (95) (1,549)
Alaska Electric Light & Power [Member] | Other utility revenues        
Disaggregation of Revenue [Line Items]        
Revenues 170 150 363 285
Corporate and Other [Member]        
Disaggregation of Revenue [Line Items]        
Revenues 2,261 6,594 10,159 13,538
Corporate and Other [Member] | Revenue from contracts with customers        
Disaggregation of Revenue [Line Items]        
Revenues 2,024 6,324 9,671 13,053
Corporate and Other [Member] | Other revenues        
Disaggregation of Revenue [Line Items]        
Revenues $ 237 $ 270 $ 488 $ 485