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Income Taxes - Schedule of Deferred Income Tax Components (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Income Taxes [Line Items]      
Net change in deferred income tax liability per above table $ 68,454    
Change in tax effects of income tax related regulatory assets and liabilities (11,602)    
Amortization of excess deferred income tax (30,723)    
Tax effect of mark-to-market adjustments (3,206)    
Tax effect of excess pension liability (3,670)    
Adjustment for uncertain income tax positions 2,459    
Reclassification of unrecognized tax benefits (2,459)    
Amortization of state net operating loss recovered in prior years 1,367    
Refundable alternative minimum tax credit carryforward reclassified to receivable 0    
Other (215)    
Deferred income taxes (benefits) 20,405 $ (25,385) $ 8,019
Public Service Company of New Mexico      
Income Taxes [Line Items]      
Net change in deferred income tax liability per above table 57,160    
Change in tax effects of income tax related regulatory assets and liabilities (7,936)    
Amortization of excess deferred income tax (21,609)    
Tax effect of mark-to-market adjustments (3,325)    
Tax effect of excess pension liability (3,670)    
Adjustment for uncertain income tax positions 2,454    
Reclassification of unrecognized tax benefits (1,999)    
Amortization of state net operating loss recovered in prior years 1,367    
Other 0    
Deferred income taxes (benefits) 22,442 (20,145) 3,334
Texas-New Mexico Power Company      
Income Taxes [Line Items]      
Net change in deferred income tax liability per above table 5,218    
Change in tax effects of income tax related regulatory assets and liabilities (3,666)    
Amortization of excess deferred income tax (9,113)    
Other (212)    
Deferred income taxes (benefits) $ (7,773) $ (7,650) $ 1,780