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Goodwill (Details) - USD ($) $ in Thousands	Sep. 30, 2024	Apr. 01, 2024	Dec. 31, 2023	Sep. 30, 2023	Apr. 01, 2020	Apr. 01, 2018
Goodwill [Line Items]
Goodwill	$ 278,297		$ 278,297	$ 278,297
PNM
Goodwill [Line Items]
Goodwill	51,632	$ 51,600	51,632			$ 51,600
Goodwill fair value exceeded by its carrying value		54.00%				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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