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Pension and Other Postretirement Benefits - Other Postretirement Benefits (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
401(k) plan |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Disclosures [Abstract] |  |  |
401(k) plan | $ 15,844 | $ 16,648 | $ 16,247
401(k) plan | Public Service Company of New Mexico |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Disclosures [Abstract] |  |  |
401(k) plan | 11,067 | 11,826 | 11,676
401(k) plan | Texas-New Mexico Power Company |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Disclosures [Abstract] |  |  |
401(k) plan | 4,776 | 4,823 | 4,572
Non-qualified plan |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Disclosures [Abstract] |  |  |
Non-qualified plan | (1,027) | 3,594 | 2,090
Non-qualified plan | Public Service Company of New Mexico |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Disclosures [Abstract] |  |  |
Non-qualified plan | (721) | 2,622 | 1,544
Non-qualified plan | Texas-New Mexico Power Company |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Disclosures [Abstract] |  |  |
Non-qualified plan | $ (305) | $ 972 | $ 547

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