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Fair Value of Derivative and Other Financial Instruments, Margin, Notional Amounts, Credit Rating (Details) (PNMR and PNM [Member], USD $)
In Thousands, unless otherwise specified
Dec. 31, 2013
Dec. 31, 2012
Derivative [Line Items]    
Contractual Liability $ 2,398 $ 2,933
Existing Cash Collateral 0 0
Net Exposure $ 2,152 $ 2,777
Commodity Contract [Member] | Economic hedges [Member] | Derivative Long Position [Member]
   
Derivative [Line Items]    
Volume positions (MMBTU/ MWh) (3,343,783,000) 1,127,500,000