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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, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Equity securities: |  |  |
Net gains from equity securities sold | $ 8,738 | $ 5,861 | $ 5,698
Net gains (losses) from equity securities still held | (442) | 17,707 | 18,319
Total net gains on equity securities | 8,296 | 23,568 | 24,017
Available-for-sale debt securities: |  |  |
Net gains (losses) on debt securities | 8,554 | (1,969) | 5,572
Net gains on investment securities | 16,850 | 21,599 | 29,589
Public Service Company of New Mexico |  |  |
Available-for-sale debt securities: |  |  |
Proceeds from sales | 459,867 | 590,998 | 494,528
Gross realized gains | 39,408 | 35,904 | 25,760
Gross realized (losses) | $ (22,815) | $ (28,817) | $ (17,453)

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