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Earnings Per Share Attributable To Avista Corporation (Computation Of Earnings Per Share) (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Numerator:                      
Income (Loss) from Continuing Operations Attributable to Parent                 $ 115,916 $ 137,228 $ 118,080
Income (Loss) from Discontinued Operations, Net of Tax, Attributable to Parent                 $ 0 $ 0 $ 5,147
Denominator:                      
Weighted-average number of common shares outstanding-basic 64,809 64,412 64,401 64,362 64,185 63,857 63,386 62,605 64,496 63,508 62,301
Performance and restricted stock awards                 310 412 407
Weighted-average number of common shares outstanding-diluted 65,308 64,892 64,553 64,469 64,620 64,325 63,783 62,907 64,806 63,920 62,708
Income (Loss) from Continuing Operations, Per Basic Share                 $ 1.80 $ 2.16 $ 1.90
Income (Loss) from Discontinued Operations and Disposal of Discontinued Operations, Net of Tax, Per Basic Share                 0.00 0.00 0.08
Earnings Per Share, Basic                 1.80 2.16 1.98
Income (Loss) from Continuing Operations, Per Diluted Share                 1.79 2.15 1.89
Income (Loss) from Discontinued Operations and Disposal of Discontinued Operations, Net of Tax, Per Diluted Share                 0.00 0.00 0.08
Earnings Per Share, Diluted $ 0.42 $ 0.07 $ 0.34 $ 0.96 $ 0.62 $ 0.19 $ 0.43 $ 0.92 $ 1.79 $ 2.15 $ 1.97