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Income Taxes - Schedule of Effective Income Tax Rate Reconciliation (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Income Taxes [Line Items]
Federal income tax at statutory rates	$ 14,038	$ 22,902	$ 79,016
Amortization of accumulated investment tax credits	(522)	(345)	(286)
Amortization of excess deferred income tax	(37,799)	(19,779)	0
Flow-through of depreciation items	1,136	712	1,147
Earnings attributable to non-controlling interest in Valencia	(2,991)	(3,173)	(5,256)
State income tax, net of federal benefit	298	1,358	5,398
Impairment of state net operating loss carryforwards	0	0	819
Allowance for equity funds used during construction	(1,990)	(2,185)	(3,331)
Impairment of charitable contribution carryforward	0	0	909
Regulatory recovery of prior year impairments of state net operating loss carryforward, including amortization	1,367	1,367	(2,225)
Federal income tax rate change	0	2,914	57,461
Tax expense (benefit) related to stock compensation awards	(795)	4,647	(2,324)
Other	1,976	(643)	(988)
Total income taxes (benefit)	$ (25,282)	$ 7,775	$ 130,340
Effective tax rate	(37.82%)	7.13%	57.73%
Public Service Company of New Mexico
Income Taxes [Line Items]
Federal income tax at statutory rates	$ 6,187	$ 13,514	$ 59,139
Amortization of accumulated investment tax credits	(247)	(247)	(286)
Amortization of excess deferred income tax	(28,923)	(19,779)	0
Flow-through of depreciation items	1,077	674	1,103
Earnings attributable to non-controlling interest in Valencia	(2,991)	(3,173)	(5,256)
State income tax, net of federal benefit	92	1,323	4,926
Impairment of state net operating loss carryforwards	0	0	627
Allowance for equity funds used during construction	(1,398)	(1,716)	(3,032)
Regulatory recovery of prior year impairments of state net operating loss carryforward, including amortization	1,367	1,367	(2,225)
Federal income tax rate change	0	(683)	29,606
Tax expense (benefit) related to stock compensation awards	(559)	3,967	(1,708)
Other	(567)	(1,218)	(1,339)
Total income taxes (benefit)	$ (25,962)	$ (5,971)	$ 81,555
Effective tax rate	(88.13%)	(9.28%)	48.27%
Texas-New Mexico Power Company
Income Taxes [Line Items]
Federal income tax at statutory rates	$ 12,778	$ 14,379	$ 23,475
Amortization of excess deferred income tax	(8,876)	0	0
State income tax, net of federal benefit	1,532	1,454	1,198
Federal income tax rate change	0	0	7,865
Tax expense (benefit) related to stock compensation awards	(236)	735	(616)
Other	(152)	312	(410)
Total income taxes (benefit)	$ 5,046	$ 16,880	$ 31,512
Effective tax rate	8.29%	24.65%	46.98%

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