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Fair Value of Derivative and Other Financial Instruments - Investments in NDT and Gross Realized Losses (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2024 | Sep. 30, 2023
Equity securities: |  |  |  |
Net gains (losses) from equity securities sold | $ 4,209 | $ (189) | $ 20,352 | $ 1,758
Net gains (losses) from equity securities still held | 9,358 | (4,946) | 4,273 | 3,673
Total net gains on equity securities | 13,567 | (5,135) | 24,625 | 5,431
Available-for-sale debt securities: |  |  |  |
Net gains (losses) on debt securities | 203 | (3,269) | 7,701 | (3,616)
Net gains (losses) on investment securities | $ 13,770 | $ (8,404) | $ 32,326 | $ 1,815

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