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Income Taxes (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2015
Mar. 31, 2015
Jun. 30, 2014
Mar. 31, 2014
Jun. 30, 2015
Jun. 30, 2014
Income Tax Contingency [Line Items]            
Decrease in regulatory liabilities due to change in state corporate tax rate   $ 2,000   $ 4,600    
Decrease in deferred tax asset due to change in state corporate tax rate       $ 200    
Income Taxes $ 17,353   $ 15,893   $ 25,870 $ 22,313
State Net Operating Loss Carryforward, Impairment   1,000        
Public Service Company of New Mexico [Member]            
Income Tax Contingency [Line Items]            
Increase in deferred tax asset not related to regulatory activity, as a result of tax rate change   700        
Decrease in income tax expense due to tax rate change   500        
Income Taxes 11,527   13,106   17,302 17,189
State Net Operating Loss Carryforward, Impairment   700        
Corporate and Other [Member]            
Income Tax Contingency [Line Items]            
Decrease in income tax expense due to tax rate change   200        
Income Taxes $ (975)   (2,803)   $ (2,836) (4,516)
State Net Operating Loss Carryforward, Impairment   $ 300        
Internal Revenue Service (IRS) [Member]            
Income Tax Contingency [Line Items]            
Income Taxes     1,300      
PNM Resources [Member] | Internal Revenue Service (IRS) [Member]            
Income Tax Contingency [Line Items]            
Income Tax Examination, Liability (Refund) Adjustment from Settlement with Taxing Authority     2,000     $ 2,000
Income Taxes     200      
Public Service Company of New Mexico [Member] | Internal Revenue Service (IRS) [Member]            
Income Tax Contingency [Line Items]            
Income Taxes     1,100      
Texas-New Mexico Power Company [Member] | Internal Revenue Service (IRS) [Member]            
Income Tax Contingency [Line Items]            
Income Taxes     $ 0