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Pension and Other Postretirement Benefits - Actuarial (Gain) Loss Results (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Public Service Company of New Mexico | Pension Plan    
Defined Benefit Plan Disclosure [Line Items]    
Discount rates $ 44,960 $ 66,108
Claims, contributions, and demographic experience 2,607 (732)
Mortality rate 0 (4,225)
Other assumptions and experience 0 0
Actuarial (gain) loss 47,567 61,151
Public Service Company of New Mexico | Other Postretirement Benefits    
Defined Benefit Plan Disclosure [Line Items]    
Discount rates 4,959 7,236
Claims, contributions, and demographic experience (1,698) (4,022)
Mortality rate 0 (627)
Assumed participation rate 0 0
Actuarial (gain) loss 3,261 2,587
Texas-New Mexico Power Company | Pension Plan    
Defined Benefit Plan Disclosure [Line Items]    
Discount rates 4,756 8,006
Claims, contributions, and demographic experience (54) 394
Mortality rate 0 (296)
Other assumptions and experience (243) (215)
Actuarial (gain) loss 4,459 7,889
Texas-New Mexico Power Company | Other Postretirement Benefits    
Defined Benefit Plan Disclosure [Line Items]    
Discount rates 1,008 1,375
Claims, contributions, and demographic experience (261) (311)
Mortality rate 0 (60)
Assumed participation rate 0 0
Actuarial (gain) loss $ 747 $ 1,004