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Revenue Revenue Disaggregation of Revenue (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | $ 283,770 | $ 296,013 | $ 981,063 | $ 1,024,672
Residential Electric [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from Contract with Customer, Including Assessed Tax | 81,312 | 85,457 | 279,166 | 285,721
Commercial and Governmental Electric [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from Contract with Customer, Including Assessed Tax | 86,209 | 87,290 | 251,488 | 257,246
Industrial Electric [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from Contract with Customer, Including Assessed Tax | 28,453 | 30,806 | 79,946 | 83,910
Public Street and Highway Lighting Electric [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from Contract with Customer, Including Assessed Tax | 1,915 | 1,926 | 5,836 | 5,815
Total Retail Electric [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from Contract with Customer, Including Assessed Tax | 197,889 | 205,479 | 616,436 | 632,692
Transmission Electric [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from Contract with Customer, Including Assessed Tax | 4,058 | 4,832 | 13,460 | 12,833
Other Electric [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from Contract with Customer, Including Assessed Tax | 5,860 | 8,564 | 18,433 | 18,774
Total Electric [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from Contract with Customer, Including Assessed Tax | 207,807 | 218,875 | 648,329 | 664,299
Residential Natural Gas [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from Contract with Customer, Including Assessed Tax | 20,271 | 19,248 | 125,543 | 130,668
Commercial Natural Gas [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from Contract with Customer, Including Assessed Tax | 10,093 | 9,436 | 60,056 | 61,477
Industrial and Interruptible Natural Gas [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from Contract with Customer, Including Assessed Tax | 1,000 | 1,006 | 3,730 | 3,767
Total Retail Natural Gas [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from Contract with Customer, Including Assessed Tax | 31,364 | 29,690 | 189,329 | 195,912
Transportation Natural Gas [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from Contract with Customer, Including Assessed Tax | 1,925 | 2,007 | 6,448 | 6,795
Other Natural Gas [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from Contract with Customer, Including Assessed Tax | 1,125 | 1,125 | 3,375 | 3,375
Total Natural Gas [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from Contract with Customer, Including Assessed Tax | 34,414 | 32,822 | 199,152 | 206,082
Avista Utilities [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 274,931 | 279,549 | 942,441 | 970,525
Avista Utilities [Member] | Residential Electric [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from Contract with Customer, Including Assessed Tax | 78,548 | 82,470 | 266,826 | 272,041
Avista Utilities [Member] | Commercial and Governmental Electric [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from Contract with Customer, Including Assessed Tax | 81,352 | 80,744 | 236,973 | 236,115
Avista Utilities [Member] | Industrial Electric [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from Contract with Customer, Including Assessed Tax | 28,453 | 30,806 | 79,946 | 83,910
Avista Utilities [Member] | Public Street and Highway Lighting Electric [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from Contract with Customer, Including Assessed Tax | 1,849 | 1,860 | 5,648 | 5,618
Avista Utilities [Member] | Total Retail Electric [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from Contract with Customer, Including Assessed Tax | 190,202 | 195,880 | 589,393 | 597,684
Avista Utilities [Member] | Transmission Electric [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from Contract with Customer, Including Assessed Tax | 4,058 | 4,832 | 13,460 | 12,833
Avista Utilities [Member] | Other Electric [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from Contract with Customer, Including Assessed Tax | 5,860 | 8,564 | 18,433 | 18,774
Avista Utilities [Member] | Total Electric [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from Contract with Customer, Including Assessed Tax | 200,120 | 209,276 | 621,286 | 629,291
Avista Utilities [Member] | Residential Natural Gas [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from Contract with Customer, Including Assessed Tax | 20,271 | 19,248 | 125,543 | 130,668
Avista Utilities [Member] | Commercial Natural Gas [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from Contract with Customer, Including Assessed Tax | 10,093 | 9,436 | 60,056 | 61,477
Avista Utilities [Member] | Industrial and Interruptible Natural Gas [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from Contract with Customer, Including Assessed Tax | 1,000 | 1,006 | 3,730 | 3,767
Avista Utilities [Member] | Total Retail Natural Gas [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from Contract with Customer, Including Assessed Tax | 31,364 | 29,690 | 189,329 | 195,912
Avista Utilities [Member] | Transportation Natural Gas [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from Contract with Customer, Including Assessed Tax | 1,925 | 2,007 | 6,448 | 6,795
Avista Utilities [Member] | Other Natural Gas [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from Contract with Customer, Including Assessed Tax | 1,125 | 1,125 | 3,375 | 3,375
Avista Utilities [Member] | Total Natural Gas [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from Contract with Customer, Including Assessed Tax | 34,414 | 32,822 | 199,152 | 206,082
Avista Utilities [Member] | Revenue from contracts with customers |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 234,534 | 242,098 | 820,438 | 835,373
Avista Utilities [Member] | Derivative revenues |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 33,372 | 32,718 | 99,628 | 147,467
Avista Utilities [Member] | Alternative Revenue Programs [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 6,038 | 606 | 11,105 | (1,763)
Avista Utilities [Member] | Deferrals and amortizations for rate refunds to customers |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | (927) | 2,922 | 3,720 | (16,900)
Avista Utilities [Member] | Other utility revenues |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 1,914 | 1,205 | 7,550 | 6,348
Alaska Electric Light & Power [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 7,790 | 9,570 | 27,414 | 33,715
Alaska Electric Light & Power [Member] | Residential Electric [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from Contract with Customer, Including Assessed Tax | 2,764 | 2,987 | 12,340 | 13,680
Alaska Electric Light & Power [Member] | Commercial and Governmental Electric [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from Contract with Customer, Including Assessed Tax | 4,857 | 6,546 | 14,515 | 21,131
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 | 66 | 66 | 188 | 197
Alaska Electric Light & Power [Member] | Total Retail Electric [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from Contract with Customer, Including Assessed Tax | 7,687 | 9,599 | 27,043 | 35,008
Alaska Electric Light & Power [Member] | Transmission Electric [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 | 7,687 | 9,599 | 27,043 | 35,008
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 | 7,687 | 9,599 | 27,043 | 35,008
Alaska Electric Light & Power [Member] | Deferrals and amortizations for rate refunds to customers |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | (48) | (156) | (143) | (1,705)
Alaska Electric Light & Power [Member] | Other utility revenues |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 151 | 127 | 514 | 412
Corporate and Other [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 1,049 | 6,894 | 11,208 | 20,432
Corporate and Other [Member] | Revenue from contracts with customers |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 731 | 6,580 | 10,402 | 19,633
Corporate and Other [Member] | Other revenues |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | $ 318 | $ 314 | $ 806 | $ 799

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