EARNINGS PER SHARE: Earnings Per Share Level 4 (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Numerator:
Net income attributable to IDACORP, Inc.	$ 194,679	$ 193,480	$ 182,417
Denominator:
Weighted Average Common Shares Outstanding - Basic (in shares)	50,220	50,131	50,052
Effect of Dilutive Securities (in shares)	72	68	74
Weighted Average Common Shares Outstanding - Diluted (in shares)	50,292	50,199	50,126
Earnings Attributable to IDACORP, Inc. - Basic (in dollars per share)	$ 3.88	$ 3.86	$ 3.64
Earnings Attributable to IDACORP, Inc. - Diluted (in dollars per share)	$ 3.87	$ 3.85	$ 3.64