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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, 2019
Dec. 31, 2018
Dec. 31, 2017
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]      
Non-current liability $ 95,037 $ 100,375  
Public Service Company of New Mexico      
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]      
Non-current liability 87,838 92,981  
Public Service Company of New Mexico | Pension Plan      
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]      
Balance at beginning of year 564,258 623,983  
Service cost 0 0 $ 0
Interest cost 25,175 24,270 26,908
Actuarial (gain) loss 61,151 (41,025)  
Benefits paid (44,839) (42,970)  
Balance at end of year 605,745 564,258 623,983
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]      
Fair value of plan assets at beginning of year 489,978 562,016  
Actual return on plan assets 86,328 (29,068)  
Employer contributions 0 0  
Fair value of plan assets at end of year 531,467 489,978 562,016
Funded status – asset (liability) for pension benefits (74,278) (74,280)  
Public Service Company of New Mexico | Other Postretirement Benefits      
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]      
Balance at beginning of year 75,305 89,897  
Service cost 53 83 96
Interest cost 3,316 3,439 4,025
Participant contributions 2,131 2,390  
Actuarial (gain) loss 2,587 (12,206)  
Benefits paid (8,271) (8,298)  
Balance at end of year 75,121 75,305 89,897
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]      
Fair value of plan assets at beginning of year 69,703 80,356  
Actual return on plan assets 19,257 (7,669)  
Employer contributions 3,580 2,924  
Fair value of plan assets at end of year 86,400 69,703 80,356
Funded status – asset (liability) for pension benefits 11,279 (5,602)  
Public Service Company of New Mexico | Executive Retirement Program      
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]      
Balance at beginning of year 14,726 16,117  
Service cost 0 0 0
Interest cost 651 622 697
Actuarial (gain) loss 1,053 (508)  
Benefits paid (1,436) (1,505)  
Balance at end of year 14,994 14,726 16,117
Less current liability 1,434 1,627  
Non-current liability 13,560 13,099  
Texas-New Mexico Power Company      
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]      
Non-current liability 7,199 7,394  
Texas-New Mexico Power Company | Pension Plan      
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]      
Balance at beginning of year 60,587 68,423  
Service cost 0 0 0
Interest cost 2,686 2,625 2,887
Actuarial (gain) loss 7,889 (5,216)  
Benefits paid (5,588) (5,245)  
Balance at end of year 65,574 60,587 68,423
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]      
Fair value of plan assets at beginning of year 55,074 63,499  
Actual return on plan assets 9,881 (3,180)  
Employer contributions 0 0  
Fair value of plan assets at end of year 59,367 55,074 63,499
Funded status – asset (liability) for pension benefits (6,207) (5,513)  
Texas-New Mexico Power Company | Other Postretirement Benefits      
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]      
Balance at beginning of year 10,064 12,279  
Service cost 50 134 143
Interest cost 451 477 556
Participant contributions 316 174  
Actuarial (gain) loss 1,004 (2,213)  
Benefits paid (650) (787)  
Balance at end of year 11,235 10,064 12,279
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]      
Fair value of plan assets at beginning of year 8,744 10,002  
Actual return on plan assets 2,434 (988)  
Employer contributions 0 343  
Fair value of plan assets at end of year 10,844 8,744 10,002
Funded status – asset (liability) for pension benefits (391) (1,320)  
Texas-New Mexico Power Company | Executive Retirement Program      
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]      
Balance at beginning of year 702 771  
Service cost 0 0 0
Interest cost 30 29 33
Actuarial (gain) loss 54 (4)  
Benefits paid (94) (94)  
Balance at end of year 692 702 $ 771
Less current liability 91 141  
Non-current liability $ 601 $ 561