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Related Party Transactions (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Service billings [Member] | TNMP to PNMR [Member]
   
Related Party Transaction [Line Items]    
Amount of related party transaction $ 0 $ 2
Service billings [Member] | PNMR to PNM [Member]
   
Related Party Transaction [Line Items]    
Amount of related party transaction 21,066 22,652
Service billings [Member] | PNMR to TNMP [Member]
   
Related Party Transaction [Line Items]    
Amount of related party transaction 7,261 7,361
Service billings [Member] | PNM to TNMP [Member]
   
Related Party Transaction [Line Items]    
Amount of related party transaction 109 108
Interest charges [Member] | PNMR to PNM [Member]
   
Related Party Transaction [Line Items]    
Amount of related party transaction 53 1
Interest charges [Member] | PNMR to TNMP [Member]
   
Related Party Transaction [Line Items]    
Amount of related party transaction 96 96
Interest charges [Member] | PNM to PNMR [Member]
   
Related Party Transaction [Line Items]    
Amount of related party transaction 26 41
Income tax sharing payments [Member] | PNMR to PNM [Member]
   
Related Party Transaction [Line Items]    
Amount of related party transaction 0 0
Income tax sharing payments [Member] | PNMR to TNMP [Member]
   
Related Party Transaction [Line Items]    
Amount of related party transaction $ 0 $ 0