Schedule I - Condensed Financial Information of Parent - Cash Flows (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Operating Activities:
Net cash provided by operating activities	$ 353,194	$ 364,343	$ 305,549
Investing Activities:
Net cash provided by (used in) investing activities	(291,706)	(272,420)	(236,593)
Financing Activities:
Issuance of common stock	0	195	255
Dividends on common stock	(96,810)	(88,489)	(78,832)
Net change in short-term borrowings	(11,300)	(23,450)	(14,950)
Other	(3,171)	2,268	(606)
Net cash used in financing activities	(3,494)	(113,277)	(17,321)
Net (decrease) increase in cash and cash equivalents	57,994	(21,354)	51,635
Cash and cash equivalents	114,802	56,808	78,162	$ 26,527
IDACORP
Operating Activities:
Net cash provided by operating activities	100,465	109,289	96,391
Investing Activities:
Distributions from (contributions to) subsidiaries	0	0	2,282
Net cash provided by (used in) investing activities	0	0	2,282
Financing Activities:
Issuance of common stock	0	195	255
Dividends on common stock	(96,810)	(88,489)	(78,832)
Net change in short-term borrowings	(11,300)	(23,450)	(14,950)
Change in intercompany notes payable	5,572	(198)	647
Other	(1,675)	(469)	(431)
Net cash used in financing activities	(104,213)	(112,411)	(93,311)
Net (decrease) increase in cash and cash equivalents	(3,748)	(3,122)	5,362
Cash and cash equivalents	$ 2,028	$ 5,776	$ 8,898	$ 3,536