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Stock-Based Compensation - Excess Tax Benefits (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Public Service Company of New Mexico |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Excess tax benefits | $ 564 | $ 279 | $ 559
Texas-New Mexico Power Company |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Excess tax benefits | 224 | 112 | 236
PNMR |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Excess tax benefits | $ 788 | $ 391 | $ 795

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