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Goodwill (Details) - USD ($) $ in Thousands | Mar. 31, 2023 | Dec. 31, 2022 | Mar. 31, 2022 | Apr. 01, 2018
--- | --- | --- | --- | ---
Goodwill [Line Items] |  |  |  |
Goodwill | $ 278,297 | $ 278,297 | $ 278,297 |
PNM |  |  |  |
Goodwill [Line Items] |  |  |  |
Goodwill | 51,632 | 51,632 |  | $ 51,600
Goodwill fair value exceeded by its carrying value |  |  |  | 19.00%
TNMP |  |  |  |
Goodwill [Line Items] |  |  |  |
Goodwill | $ 226,665 | $ 226,665 |  | $ 226,700
Goodwill fair value exceeded by its carrying value |  |  |  | 38.00%

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