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Fair Value of Derivative and Other Financial Instruments - Investment in NDT and Gross Realized Losses (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Equity securities: |  |  |
Net gains (losses) from equity securities sold | $ (6,940) | $ 8,738 | $ 5,861
Net gains (losses) from equity securities still held | (38,025) | (442) | 17,707
Total net gains (losses) on equity securities | (44,965) | 8,296 | 23,568
Available-for-sale debt securities: |  |  |
Net gains (losses) on debt securities | (33,392) | 8,554 | (1,969)
Net gains (losses) on investment securities | (78,357) | 16,850 | 21,599
Public Service Company of New Mexico |  |  |
Available-for-sale debt securities: |  |  |
Proceeds from sales | 526,448 | 459,867 | 590,998
Gross realized gains | 22,071 | 39,408 | 35,904
Gross realized (losses) | $ (36,623) | $ (22,815) | $ (28,817)

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