SEGMENT INFORMATION: Level 4 (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014	Dec. 31, 2014
Segment Reporting Information
Revenues	$ 369,165	$ 382,201	$ 984,889	$ 992,703
Income (loss) attributable to IDACORP, Inc.	73,267	87,234	162,802	159,115
Net Income Attributable to IDACORP, Inc.	73,336	86,889	162,847	158,832
Total assets	5,937,986		5,937,986		$ 5,716,853
Idaho Power Company
Segment Reporting Information
Revenues	368,517	380,711	982,612	989,686
Income (loss) attributable to IDACORP, Inc.	71,727	84,600	159,528	155,154
Total assets	5,835,296		5,835,296
All Other
Segment Reporting Information
Revenues	648	1,490	2,277	3,017
Income (loss) attributable to IDACORP, Inc.	1,609	2,289	3,319	3,678
Total assets	125,019		125,019
Eliminations
Segment Reporting Information
Revenues	0	0	0	0
Income (loss) attributable to IDACORP, Inc.	0	0	0	0
Total assets	(22,329)		$ (22,329)
Idaho Power Company
Segment Reporting Information
IERCo's ownership percentage in Bridger Coal Company			33.00%
Income (loss) attributable to IDACORP, Inc.	71,727	$ 84,600	$ 159,528	$ 155,154
Total assets	$ 5,841,006		$ 5,841,006		$ 5,626,677