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Related Party Transactions (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Service billings [Member] | TNMP to PNMR [Member]
       
Related Party Transaction [Line Items]        
Amount of related party transaction $ 2 $ 4 $ 6 $ 12
Service billings [Member] | PNMR to PNM [Member]
       
Related Party Transaction [Line Items]        
Amount of related party transaction 22,241 22,143 65,729 68,030
Service billings [Member] | PNMR to TNMP [Member]
       
Related Party Transaction [Line Items]        
Amount of related party transaction 6,731 6,439 20,948 20,206
Service billings [Member] | PNM to TNMP [Member]
       
Related Party Transaction [Line Items]        
Amount of related party transaction 140 184 381 473
Interest charges [Member] | PNMR to PNM [Member]
       
Related Party Transaction [Line Items]        
Amount of related party transaction 0 0 1 1
Interest charges [Member] | PNMR to TNMP [Member]
       
Related Party Transaction [Line Items]        
Amount of related party transaction 139 22 354 72
Interest charges [Member] | PNM to PNMR [Member]
       
Related Party Transaction [Line Items]        
Amount of related party transaction 35 45 113 134
Income tax sharing payments [Member] | PNMR to PNM [Member]
       
Related Party Transaction [Line Items]        
Amount of related party transaction 0 0 45,000 63,114
Income tax sharing payments [Member] | PNMR to TNMP [Member]
       
Related Party Transaction [Line Items]        
Amount of related party transaction $ 0 $ 0 $ 0 $ 1,952