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Revenue Revenue Disaggregation of Revenue (Details) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2019 | Mar. 31, 2018
Disaggregation of Revenue [Line Items] |  |
Revenues | $ 396,481 | $ 409,361
Residential Electric [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from Contract with Customer, Including Assessed Tax | 121,244 | 121,291
Commercial and Governmental Electric [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from Contract with Customer, Including Assessed Tax | 84,066 | 86,953
Industrial Electric [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from Contract with Customer, Including Assessed Tax | 25,248 | 25,119
Public Street and Highway Lighting Electric [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from Contract with Customer, Including Assessed Tax | 1,966 | 1,927
Total Retail Electric [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from Contract with Customer, Including Assessed Tax | 232,524 | 235,290
Electric Transmission [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from Contract with Customer, Including Assessed Tax | 5,152 | 3,830
Other Electric [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from Contract with Customer, Including Assessed Tax | 8,194 | 6,291
Total Electric [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from Contract with Customer, Including Assessed Tax | 245,870 | 245,411
Residential Natural Gas [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from Contract with Customer, Including Assessed Tax | 77,336 | 80,653
Commercial Natural Gas [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from Contract with Customer, Including Assessed Tax | 36,595 | 37,373
Industrial and Interruptible Natural Gas [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from Contract with Customer, Including Assessed Tax | 1,627 | 1,683
Total Retail Natural Gas [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from Contract with Customer, Including Assessed Tax | 115,558 | 119,709
Transportation Natural Gas [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from Contract with Customer, Including Assessed Tax | 2,484 | 2,567
Other Natural Gas [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from Contract with Customer, Including Assessed Tax | 1,125 | 1,125
Total Natural Gas [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from Contract with Customer, Including Assessed Tax | 119,167 | 123,401
Avista Utilities [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 377,702 | 388,754
Avista Utilities [Member] | Residential Electric [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from Contract with Customer, Including Assessed Tax | 115,392 | 114,753
Avista Utilities [Member] | Commercial and Governmental Electric [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from Contract with Customer, Including Assessed Tax | 79,245 | 78,909
Avista Utilities [Member] | Industrial Electric [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from Contract with Customer, Including Assessed Tax | 25,248 | 25,119
Avista Utilities [Member] | Public Street and Highway Lighting Electric [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from Contract with Customer, Including Assessed Tax | 1,903 | 1,859
Avista Utilities [Member] | Total Retail Electric [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from Contract with Customer, Including Assessed Tax | 221,788 | 220,640
Avista Utilities [Member] | Electric Transmission [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from Contract with Customer, Including Assessed Tax | 5,152 | 3,830
Avista Utilities [Member] | Other Electric [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from Contract with Customer, Including Assessed Tax | 8,194 | 6,291
Avista Utilities [Member] | Total Electric [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from Contract with Customer, Including Assessed Tax | 235,134 | 230,761
Avista Utilities [Member] | Residential Natural Gas [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from Contract with Customer, Including Assessed Tax | 77,336 | 80,653
Avista Utilities [Member] | Commercial Natural Gas [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from Contract with Customer, Including Assessed Tax | 36,595 | 37,373
Avista Utilities [Member] | Industrial and Interruptible Natural Gas [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from Contract with Customer, Including Assessed Tax | 1,627 | 1,683
Avista Utilities [Member] | Total Retail Natural Gas [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from Contract with Customer, Including Assessed Tax | 115,558 | 119,709
Avista Utilities [Member] | Transportation Natural Gas [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from Contract with Customer, Including Assessed Tax | 2,484 | 2,567
Avista Utilities [Member] | Other Natural Gas [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from Contract with Customer, Including Assessed Tax | 1,125 | 1,125
Avista Utilities [Member] | Total Natural Gas [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from Contract with Customer, Including Assessed Tax | 119,167 | 123,401
Avista Utilities [Member] | Revenue from contracts with customers |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 354,301 | 354,162
Avista Utilities [Member] | Derivative revenues |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 24,127 | 58,392
Avista Utilities [Member] | Alternative revenue programs |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | (4,658) | (5,939)
Avista Utilities [Member] | Deferrals and amortizations for rate refunds to customers |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 2,135 | (19,822)
Avista Utilities [Member] | Other utility revenues |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 1,797 | 1,961
Alaska Electric Light & Power [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 10,881 | 13,663
Alaska Electric Light & Power [Member] | Residential Electric [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from Contract with Customer, Including Assessed Tax | 5,852 | 6,538
Alaska Electric Light & Power [Member] | Commercial and Governmental Electric [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from Contract with Customer, Including Assessed Tax | 4,821 | 8,044
Alaska Electric Light & Power [Member] | Industrial Electric [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from Contract with Customer, Including Assessed Tax | 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 | 63 | 68
Alaska Electric Light & Power [Member] | Total Retail Electric [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from Contract with Customer, Including Assessed Tax | 10,736 | 14,650
Alaska Electric Light & Power [Member] | Electric Transmission [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from Contract with Customer, Including Assessed Tax | 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
Alaska Electric Light & Power [Member] | Total Electric [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from Contract with Customer, Including Assessed Tax | 10,736 | 14,650
Alaska Electric Light & Power [Member] | Residential Natural Gas [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from Contract with Customer, Including Assessed Tax | 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
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
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
Alaska Electric Light & Power [Member] | Transportation Natural Gas [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from Contract with Customer, Including Assessed Tax | 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
Alaska Electric Light & Power [Member] | Total Natural Gas [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from Contract with Customer, Including Assessed Tax | 0 | 0
Alaska Electric Light & Power [Member] | Revenue from contracts with customers |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 10,736 | 14,650
Alaska Electric Light & Power [Member] | Deferrals and amortizations for rate refunds to customers |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | (48) | (1,122)
Alaska Electric Light & Power [Member] | Other utility revenues |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 193 | 135
Corporate and Other [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 7,898 | 6,944
Corporate and Other [Member] | Revenue from contracts with customers |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 7,647 | 6,729
Corporate and Other [Member] | Other revenues |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | $ 251 | $ 215

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