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STOCK-BASED COMPENSATION Stock-based Compensation Narrative (Details) - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Share-based Compensation Arrangement by Share-based Payment Award      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number 0    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Net of Forfeitures 0 0 0
Equity compensation costs capitalized $ 0    
Restricted Stock      
Share-based Compensation Arrangement by Share-based Payment Award      
Maximum shares outstanding (in shares) 15,796    
Vesting period of restricted stock awards 3 years    
Percent of target award, minimum 0.00% 0.00%  
Percent of target award, maximum 200.00% 150.00%  
Total fair value of shares vested (in shares) $ 8,300 $ 6,600 $ 5,000
Period over which unrecognized compensation cost will be recognized (in years) 1 year 8 months 11 days 20 hours 24 minutes    
Restricted Stock | Directors      
Share-based Compensation Arrangement by Share-based Payment Award      
Shares awarded to directors 15,324    
Shares granted - weighted average grant-date fair value (in dollars per share) $ 62.62    
Deferred shares (in shares) 3,831    
Restricted Stock | IDACORP      
Share-based Compensation Arrangement by Share-based Payment Award      
Unrecognized compensation cost $ 4,700    
Shares granted - weighted average grant-date fair value (in dollars per share) $ 54.01    
Restricted Stock | Idaho Power Company      
Share-based Compensation Arrangement by Share-based Payment Award      
Unrecognized compensation cost $ 4,700    
Shares granted - weighted average grant-date fair value (in dollars per share) $ 54.05    
Continuous equity program      
Share-based Compensation Arrangement by Share-based Payment Award      
Maximum shares outstanding (in shares) 1,043,542    
Vesting period of performance-based awards 3 years