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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
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Mar. 31, 2024 | Mar. 31, 2023
Equity securities: |  |
Net gains (losses) from equity securities sold | $ 9,871 | $ (844)
Net gains (losses) from equity securities still held | (1,205) | 7,477
Total net gains on equity securities | 8,666 | 6,633
Available-for-sale debt securities: |  |
Net gains (losses) on debt securities | 9,332 | (191)
Net gains on investment securities | $ 17,998 | $ 6,442

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