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Commitments and Contingencies - Coal Supply (Details) - USD ($)
$ in Thousands
 6 Months Ended 12 Months Ended
Jun. 30, 2015
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Public Utilities, Commitments And Contingencies [Line Items]        
Other current assets $ 71,482 $ 58,471    
Public Service Company of New Mexico [Member] | Surface [Member]        
Public Utilities, Commitments And Contingencies [Line Items]        
Regulatory Assets 100,000      
Public Service Company of New Mexico [Member] | Loss on Long-term Purchase Commitment [Member]        
Public Utilities, Commitments And Contingencies [Line Items]        
Public Utilities, Annual Funding   1,000 $ 300 $ 3,500
Public Service Company of New Mexico [Member] | Mine Reclamation Trust [Member]        
Public Utilities, Commitments And Contingencies [Line Items]        
Reclamation Trust Funding, Current fiscal year 4,000      
Reclamation Trust Funding, Next fiscal year 5,000      
Public Service Company of New Mexico [Member] | Loss on Long-term Purchase Commitment [Member] | Surface [Member]        
Public Utilities, Commitments And Contingencies [Line Items]        
Loss Contingency Accrual 25,400 25,700    
Final Reclamation, capped amount to be collected 100,000      
Public Service Company of New Mexico [Member] | Loss on Long-term Purchase Commitment [Member] | Underground [Member]        
Public Utilities, Commitments And Contingencies [Line Items]        
Loss Contingency Accrual 9,100 8,600    
San Juan Generating Station [Member] | Public Service Company of New Mexico [Member] | Loss on Long-term Purchase Commitment [Member] | Surface [Member]        
Public Utilities, Commitments And Contingencies [Line Items]        
Loss Contingency, Estimate of Possible Loss 56,500      
San Juan Generating Station [Member] | Public Service Company of New Mexico [Member] | Loss on Long-term Purchase Commitment [Member] | Underground [Member]        
Public Utilities, Commitments And Contingencies [Line Items]        
Loss Contingency, Estimate of Possible Loss 93,300      
San Juan Generating Station [Member] | Coal Supply [Member] | Public Service Company of New Mexico [Member]        
Public Utilities, Commitments And Contingencies [Line Items]        
Other current assets $ 41,900 $ 37,300    
Public Utilities, Estimated Increase in Coal Cost, Percentage 30.00%