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INCOME TAXES: Level 3 (Tables)
 9 Months Ended
Sep. 30, 2016
Income Tax Disclosure [Abstract]  
Schedule of Components of Income Tax Expense (Benefit) [Table Text Block]
The following table provides a summary of income tax expense for the nine months ended September 30 (in thousands of dollars): 
 
 
IDACORP
 
Idaho Power
 
 
2016
 
2015
 
2016
 
2015
Income tax at statutory rates (federal and state)
 
$
75,736

 
$
79,030

 
$
74,864

 
$
78,356

Additional ADITC amortization
 
(1,500
)
 
—

 
(1,500
)
 
—

First mortgage bond redemption costs
 
(5,583
)
 
(7,210
)
 
(5,583
)
 
(7,210
)
Share-based compensation
 
(1,754
)
 
—

 
(1,720
)
 
—

Affordable housing tax credits
 
(2,130
)
 
(2,628
)
 
—

 
—

Affordable housing investment distributions, net of statutory rates
 
(1,561
)
 
—

 
—

 
—

Affordable housing investment amortization, net of statutory rates
 
1,019

 
1,025

 
—

 
—

Other(1)
 
(35,605
)
 
(30,941
)
 
(34,964
)
 
(30,274
)
Income tax expense
 
$
28,622

 
$
39,276

 
$
31,097

 
$
40,872

Effective tax rate
 
14.8
%
 
19.4
%
 
16.2
%
 
20.4
%
(1) "Other" is primarily comprised of the net tax effect of Idaho Power's regulatory flow-through tax adjustments. These adjustments, which include the capitalized repairs deduction, are each listed in the rate reconciliation table in Note 2 to the consolidated financial statements included in IDACORP's and Idaho Power's Annual Report on Form 10-K for the year ended December 31, 2015.