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Pension and Other Postretirement Benefits - APBO, PBO, Fair Value of Plan Assets, and Funded Status of the Plans (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]      
Non-current liability $ 58,101 $ 95,037  
Public Service Company of New Mexico      
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]      
Non-current liability 56,273 87,838  
Public Service Company of New Mexico | Pension Plan      
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]      
Balance at beginning of year 605,745 564,258  
Service cost 0 0 $ 0
Interest cost 19,941 25,175 24,270
Actuarial (gain) loss 47,567 61,151  
Benefits paid (42,349) (44,839)  
Balance at end of year 630,904 605,745 564,258
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]      
Fair value of plan assets at beginning of year 531,467 489,978  
Actual return on plan assets 98,412 86,328  
Employer contributions 0 0  
Fair value of plan assets at end of year 587,530 531,467 489,978
Funded status – asset (liability) for pension benefits (43,374) (74,278)  
Public Service Company of New Mexico | Other Postretirement Benefits      
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]      
Balance at beginning of year 75,121 75,305  
Service cost 38 53 83
Interest cost 2,453 3,316 3,439
Participant contributions 1,714 2,131  
Actuarial (gain) loss 3,261 2,587  
Benefits paid (7,391) (8,271)  
Balance at end of year 75,196 75,121 75,305
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]      
Fair value of plan assets at beginning of year 86,400 69,703  
Actual return on plan assets 9,423 19,257  
Employer contributions 3,256 3,580  
Participant contributions 1,714 2,131  
Benefits paid 7,391 8,271  
Fair value of plan assets at end of year 93,402 86,400 69,703
Funded status – asset (liability) for pension benefits 18,206 11,279  
Public Service Company of New Mexico | Executive Retirement Program      
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]      
Balance at beginning of year 14,994 14,726  
Service cost 0 0 0
Interest cost 491 651 622
Actuarial (gain) loss 78 1,053  
Benefits paid (1,341) (1,436)  
Balance at end of year 14,222 14,994 14,726
Less current liability 1,323 1,434  
Non-current liability 12,899 13,560  
Texas-New Mexico Power Company      
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]      
Non-current liability 1,828 7,199  
Texas-New Mexico Power Company | Pension Plan      
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]      
Balance at beginning of year 65,574 60,587  
Service cost 0 0 0
Interest cost 2,177 2,686 2,625
Actuarial (gain) loss 4,459 7,889  
Benefits paid (4,820) (5,588)  
Balance at end of year 67,390 65,574 60,587
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]      
Fair value of plan assets at beginning of year 59,367 55,074  
Actual return on plan assets 11,602 9,881  
Employer contributions 0 0  
Fair value of plan assets at end of year 66,149 59,367 55,074
Funded status – asset (liability) for pension benefits (1,241) (6,207)  
Texas-New Mexico Power Company | Other Postretirement Benefits      
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]      
Balance at beginning of year 11,235 10,064  
Service cost 46 50 134
Interest cost 373 451 477
Participant contributions 243 316  
Actuarial (gain) loss 747 1,004  
Benefits paid (706) (650)  
Balance at end of year 11,938 11,235 10,064
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]      
Fair value of plan assets at beginning of year 10,844 8,744  
Actual return on plan assets 2,505 2,434  
Employer contributions 0 0  
Participant contributions 243 316  
Benefits paid 707 650  
Fair value of plan assets at end of year 12,885 10,844 8,744
Funded status – asset (liability) for pension benefits 947 (391)  
Texas-New Mexico Power Company | Executive Retirement Program      
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]      
Balance at beginning of year 692 702  
Service cost 0 0 0
Interest cost 22 30 29
Actuarial (gain) loss 58 54  
Benefits paid (94) (94)  
Balance at end of year 678 692 $ 702
Less current liability 91 91  
Non-current liability $ 587 $ 601