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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 |

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