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Selected Quarterly Financial Data (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
Selected Quarterly Financial Information [Abstract]                      
Operating revenues $ 397,862 $ 297,096 $ 314,501 $ 436,470 $ 402,123 $ 303,349 $ 318,838 $ 418,173 $ 1,445,929 $ 1,442,483 $ 1,484,776
Operating expenses 315,878 266,054 258,404 321,084 319,590 263,755 257,247 312,088 1,161,420 1,152,680 1,231,562
Income from operations 81,984 31,042 56,097 115,386 82,533 39,594 61,591 106,085 284,509 289,803 253,214
Net income 27,615 4,458 21,722 62,137 40,103 12,261 27,287 57,665 115,932 137,316 123,317
Net income attributable to noncontrolling interests (37) (7) 49 (21) (12) (27) (33) (16) (16) (88) (90)
Net income attributable to Avista Corp. shareholders $ 27,578 $ 4,451 $ 21,771 $ 62,116 $ 40,091 $ 12,234 $ 27,254 $ 57,649 $ 115,916 $ 137,228 $ 123,227
Weighted average, basic 64,809 64,412 64,401 64,362 64,185 63,857 63,386 62,605 64,496 63,508 62,301
Weighted average, diluted 65,308 64,892 64,553 64,469 64,620 64,325 63,783 62,907 64,806 63,920 62,708
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