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Related Party Transactions (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Service billings [Member] | PNMR to PNM [Member]        
Related Party Transaction [Line Items]        
Amount of related party transaction $ 21,340 $ 22,190 $ 44,067 $ 43,256
Service billings [Member] | PNMR to TNMP [Member]        
Related Party Transaction [Line Items]        
Amount of related party transaction 6,591 6,963 13,680 14,224
Service billings [Member] | PNM to TNMP [Member]        
Related Party Transaction [Line Items]        
Amount of related party transaction 184 133 288 242
Service billings [Member] | TNMP to PNMR [Member]        
Related Party Transaction [Line Items]        
Amount of related party transaction 0 0 0 0
Interest charges [Member] | PNMR to PNM [Member]        
Related Party Transaction [Line Items]        
Amount of related party transaction 22 0 28 54
Interest charges [Member] | PNMR to TNMP [Member]        
Related Party Transaction [Line Items]        
Amount of related party transaction 54 83 133 180
Interest charges [Member] | PNM to PNMR [Member]        
Related Party Transaction [Line Items]        
Amount of related party transaction 26 25 55 51
Income tax sharing payments [Member] | PNMR to PNM [Member]        
Related Party Transaction [Line Items]        
Amount of related party transaction 0 0 1,450 0
Income tax sharing payments [Member] | PNMR to TNMP [Member]        
Related Party Transaction [Line Items]        
Amount of related party transaction $ 0 $ 0 $ 0 $ 0