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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, 2022 | Sep. 30, 2021 | Sep. 30, 2022 | Sep. 30, 2021
Equity securities: |  |  |  |
Net gains (losses) from equity securities sold | $ (2,210) | $ (309) | $ 1,735 | $ 5,931
Net gains (losses) from equity securities still held | (4,061) | (3,153) | (52,320) | 2,388
Total net gains (losses) on equity securities | (6,271) | (3,462) | (50,585) | 8,319
Available-for-sale debt securities: |  |  |  |
Net gains (losses) on debt securities | (9,465) | 5,410 | (33,519) | 7,789
Net gains (losses) on investment securities | $ (15,736) | $ 1,948 | $ (84,104) | $ 16,108

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