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FAIR VALUE MEASUREMENTS: Level 4 (Details) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2012
Dec. 31, 2011
Fair Value Disclosures    
Asset derivatives $ 1,703 $ 3,754
Money market funds 100 100
Trading securities: Equity securities 2,350 3,439
Available-for-sale securities: Equity securities 25,913 22,205
Liability derivatives 4,994 4,707
Quoted Prices in Active Markets for Identical Assets (Level 1)
   
Fair Value Disclosures    
Asset derivatives 1,184 3,654
Money market funds 100 100
Trading securities: Equity securities 2,350 3,439
Available-for-sale securities: Equity securities 25,913 22,205
Liability derivatives 512 405
Significant Other Observable Inputs (Level 2)
   
Fair Value Disclosures    
Asset derivatives 519 100
Money market funds 0 0
Trading securities: Equity securities 0 0
Available-for-sale securities: Equity securities 0 0
Liability derivatives 4,482 4,302
Significant Unobservable Inputs (Level 3)
   
Fair Value Disclosures    
Asset derivatives 0 0
Money market funds 0 0
Trading securities: Equity securities 0 0
Available-for-sale securities: Equity securities 0 0
Liability derivatives 0 0
Carrying Amount
   
Fair Value Disclosures    
Notes receivable 3,097 [1] 3,097 [1]
Long-term debt 1,540,663 [1] 1,491,727 [1]
Carrying Amount | Idaho Power Company
   
Fair Value Disclosures    
Long-term debt 1,540,663 [1] 1,491,727 [1]
Estimated Fair Value
   
Fair Value Disclosures    
Notes receivable 3,097 [1] 3,097 [1]
Long-term debt 1,811,021 [1] 1,737,912 [1]
Estimated Fair Value | Idaho Power Company
   
Fair Value Disclosures    
Long-term debt $ 1,811,021 [1] $ 1,737,912 [1]
[1] Notes receivable and long-term debt are categorized as Level 3 and Level 2, respectively, of the fair value hierarchy, as defined earlier in this financial statement footnote.