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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

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