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Income Taxes (Details) - USD ($) $ in Thousands		3 Months Ended		9 Months Ended		12 Months Ended
	May 23, 2017	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018	Dec. 31, 2019
Income Tax Contingency [Line Items]
Income taxes (benefit)		$ 9,188	$ 12,899	$ (32,420)	$ 18,838
Tax benefits related to stock awards		100		800
PNMR
Income Tax Contingency [Line Items]
Deferred federal, state and local, income tax expense (benefit)				30,300
PNM
Income Tax Contingency [Line Items]
Deferred federal, state and local, income tax expense (benefit)				21,400
Income taxes (benefit)		9,525	9,012	(31,984)	11,009
Tax benefits related to stock awards		100		600
TNMP
Income Tax Contingency [Line Items]
Deferred federal, state and local, income tax expense (benefit)				8,900
Income taxes (benefit)		2,228	$ 4,634	3,982	$ 11,602
Tax benefits related to stock awards		100		200
NMPRC
Income Tax Contingency [Line Items]
Period of time for proposed return to customers the benefit of the reduction in New Mexico's corporate income tax rate	23 years
NMPRC | PNM
Income Tax Contingency [Line Items]
Period of time for proposed return to customers the benefit of the reduction in New Mexico's corporate income tax rate	3 years
New Mexico 2015 Rate Case | PNM
Income Tax Contingency [Line Items]
Pre-tax impairment of investments		$ 150,600		150,600
Income taxes (benefit)				$ (45,700)
Forecast
Income Tax Contingency [Line Items]
Effective tax rate						8.43%
Forecast | PNM
Income Tax Contingency [Line Items]
Effective tax rate						10.75%
Forecast | TNMP
Income Tax Contingency [Line Items]
Effective tax rate						8.43%

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