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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
Mar. 31, 2014
Dec. 31, 2013
Derivative [Line Items]    
Contractual Liability $ 2,981 $ 2,398
Existing Cash Collateral 0 0
Net Exposure $ 1,913 $ 2,152
Commodity Contract [Member] | Fair Value Hedging [Member] | Derivative Long Position [Member]
   
Derivative [Line Items]    
Volume positions (Decatherms / MWh) (3,287,548) 905,000