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Income Taxes (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2015
Mar. 31, 2015
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Sep. 30, 2015
Sep. 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 $ 35,752   $ 31,055     $ 61,621 $ 53,368
State net operating loss carryforward, impairment 300 1,000          
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)      
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      
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 27,258   25,142     44,560 42,331
State net operating loss carryforward, impairment 200 700          
Corporate and Other [Member]              
Income Tax Contingency [Line Items]              
Decrease in income tax expense due to tax rate change   200          
Income Taxes 699   $ (1,528)     $ (2,139) $ (6,044)
State net operating loss carryforward, impairment 100 $ 300          
New Mexico wind energy production tax credit carryforward, Impairment $ 1,000