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Income Taxes Accumulated Accrued Interest Receivable (Payable) Related to Income Taxes (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2012
Dec. 31, 2011
PNMR [Member]
    
Income Taxes [Line Items]    
Accumulated accrued interest receivable $ 3,796 $ 3,552
Accumulated accrued interest payable (1,108) (1,107)
Public Service Company of New Mexico [Member]
    
Income Taxes [Line Items]    
Accumulated accrued interest receivable 3,796 3,552
Accumulated accrued interest payable (23) (23)
Texas-New Mexico Power Company [Member]
    
Income Taxes [Line Items]    
Accumulated accrued interest receivable 0 0
Accumulated accrued interest payable $ (116) $ (113)