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Income Taxes - Balance Sheet Location (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2012
Dec. 31, 2011
Income Tax Disclosures [Line Items]    
Current deferred taxes $ (53,437) $ (101,934)
Non-current deferred taxes 1,261,636 1,153,172
Total 1,208,199 1,051,238
PUGET SOUND ENERGY, INC.
   
Income Tax Disclosures [Line Items]    
Current deferred taxes (68,015) (112,204)
Non-current deferred taxes 1,274,602 1,115,056
Total $ 1,206,587 $ 1,002,852