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Income Taxes - Schedule of Deferred Income Tax Components (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Income Taxes [Line Items]      
Net change in deferred income tax liability per above table $ 53,509    
Change in tax effects of income tax related regulatory assets and liabilities (27,833)    
Amortization of excess deferred income tax (19,779)    
Tax effect of mark-to-market adjustments 380    
Tax effect of excess pension liability 308    
Adjustment for uncertain income tax positions 765    
Reclassification of unrecognized tax benefits (765)    
Amortization of state net operating loss recovered in prior years 1,367    
Federal income tax rate change, including impact on regulatory liabilities 2,330    
Refundable alternative minimum tax credit carryforward reclassified to receivable (1,585)    
Other (678)    
Deferred income taxes 8,019 $ 130,528 $ 63,805
Public Service Company of New Mexico      
Income Taxes [Line Items]      
Net change in deferred income tax liability per above table 53,755    
Change in tax effects of income tax related regulatory assets and liabilities (27,833)    
Amortization of excess deferred income tax (19,779)    
Tax effect of mark-to-market adjustments 579    
Tax effect of excess pension liability 308    
Adjustment for uncertain income tax positions 725    
Reclassification of unrecognized tax benefits (725)    
Amortization of state net operating loss recovered in prior years 1,367    
Federal income tax rate change, including impact on regulatory liabilities (6,250)    
Other 1,187    
Deferred income taxes 3,334 82,549 53,119
Texas-New Mexico Power Company      
Income Taxes [Line Items]      
Net change in deferred income tax liability per above table 9,823    
Change in tax effects of income tax related regulatory assets and liabilities (350)    
Federal income tax rate change, including impact on regulatory liabilities (7,761)    
Other 68    
Deferred income taxes $ 1,780 $ 27,275 $ 12,662