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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, 2023 | Sep. 30, 2022 | Sep. 30, 2023 | Sep. 30, 2022
Equity securities: |  |  |  |
Net gains (losses) from equity securities sold | $ (189) | $ (2,210) | $ 1,758 | $ 1,735
Net gains (losses) from equity securities still held | (4,946) | (4,061) | 3,673 | (52,320)
Total net gains (losses) on equity securities | (5,135) | (6,271) | 5,431 | (50,585)
Available-for-sale debt securities: |  |  |  |
Net (losses) on debt securities | (3,269) | (9,465) | (3,616) | (33,519)
Net gains (losses) on investment securities | $ (8,404) | $ (15,736) | $ 1,815 | $ (84,104)

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