EARNINGS PER SHARE: Level 4 (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Numerator:
Net Income Attributable to IDACORP, Inc.	$ 53,156	$ 62,288	$ 95,842	$ 98,430
Denominator:
Weighted-average common shares outstanding - basic	50,499	50,435	50,504	50,430
Effect of dilutive securities	8	46	8	42
Weighted-average common shares outstanding - diluted	50,507	50,481	50,512	50,472
Earnings attributable to IDACORP, Inc. - basic (in dollars per share)	$ 1.05	$ 1.24	$ 1.90	$ 1.95
Earnings attributable to IDACORP, Inc. - diluted (in dollars per share)	$ 1.05	$ 1.23	$ 1.90	$ 1.95