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Related Party Transactions (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Service billings [Member] | PNMR to PNM [Member]        
Related Party Transaction [Line Items]        
Amount of related party transaction $ 21,894 $ 20,813 $ 65,961 $ 64,069
Service billings [Member] | PNMR to TNMP [Member]        
Related Party Transaction [Line Items]        
Amount of related party transaction 6,707 6,471 20,366 20,695
Service billings [Member] | PNM to TNMP [Member]        
Related Party Transaction [Line Items]        
Amount of related party transaction 136 142 424 402
Service billings [Member] | TNMP to PNMR [Member]        
Related Party Transaction [Line Items]        
Amount of related party transaction 0 20 0 21
Interest charges [Member] | PNMR to PNM [Member]        
Related Party Transaction [Line Items]        
Amount of related party transaction 10 1 38 55
Interest charges [Member] | PNMR to TNMP [Member]        
Related Party Transaction [Line Items]        
Amount of related party transaction 34 65 167 245
Interest charges [Member] | PNM to PNMR [Member]        
Related Party Transaction [Line Items]        
Amount of related party transaction 24 28 79 79
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