Consolidated Statements of Comprehensive Income (Parenthetical) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Tax	$ (1,555)	$ 253	$ 1,851
Idaho Power Company
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Tax	$ (1,555)	$ 253	$ 1,851