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Income Taxes - Federal Income Tax Reform (Details) - USD ($) $ in Thousands |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jan. 10, 2018 | Mar. 31, 2021 | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2017
Income Taxes [Line Items] |  |  |  |  |  |
Federal and state excess deferred income taxes |  |  | $ 24,500 |  |  |
Income taxes (benefit) |  |  | 32,582 | $ 20,636 | $ (25,282) |
Public Service Company of New Mexico |  |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |  |
Federal and state excess deferred income taxes |  |  | 15,200 |  |  |
Income taxes (benefit) |  |  | 26,992 | 21,857 | (25,962) |
TNMP |  |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |  |
Federal and state excess deferred income taxes |  |  | 9,300 |  |  |
Income taxes (benefit) |  |  | $ 7,912 | $ 6,308 | 5,046 |
NMPRC |  |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |  |
Proposed term for providing benefits to customers related to reduction in state corporate tax |  | 3 years |  |  |  | 23 years
NMPRC | Public Service Company of New Mexico |  |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |  |
Proposed term for providing benefits to customers related to reduction in state corporate tax | 3 years |  |  |  |  |
New Mexico 2015 Rate Case | Public Service Company of New Mexico |  |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |  |
Pre-tax impairment of investments |  |  |  |  | 150,600 |
Income taxes (benefit) |  |  |  |  | $ (45,700) |

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