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Income Taxes Schedule of Deferred Income Tax Components (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Income Taxes [Line Items]      
Net change in deferred income tax liability per above table $ 112,641    
Change in tax effects of income tax related regulatory assets and liabilities 29,427    
Tax effect of mark-to-market adjustments (356)    
Tax effect of excess pension liability (508)    
Adjustment for uncertain income tax positions (16,555)    
Other (225)    
Deferred income taxes 124,424 35,674 27,727
Public Service Company of New Mexico [Member]
      
Income Taxes [Line Items]      
Net change in deferred income tax liability per above table 62,223    
Change in tax effects of income tax related regulatory assets and liabilities 29,539    
Tax effect of mark-to-market adjustments 367    
Tax effect of excess pension liability (360)    
Adjustment for uncertain income tax positions (1,196)    
Other (6)    
Deferred income taxes 90,567 113,680 4,648
Texas-New Mexico Power Company [Member]
      
Income Taxes [Line Items]      
Net change in deferred income tax liability per above table 16,680    
Change in tax effects of income tax related regulatory assets and liabilities (112)    
Tax effect of excess pension liability (148)    
Adjustment for uncertain income tax positions (87)    
Other (855)    
Deferred income taxes $ 15,478 $ 4,962 $ 31,855