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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 | 6 Months Ended
--- | --- | ---
Jun. 30, 2023 | Jun. 30, 2022 | Jun. 30, 2023 | Jun. 30, 2022
Equity securities: |  |  |  |
Net gains (losses) from equity securities sold | $ 2,792 | $ (1,061) | $ 1,947 | $ 3,945
Net gains (losses) from equity securities still held | 1,142 | (26,224) | 8,619 | (48,259)
Total net gains (losses) on equity securities | 3,934 | (27,285) | 10,566 | (44,314)
Available-for-sale debt securities: |  |  |  |
Net (losses) on debt securities | (157) | (14,510) | (347) | (24,054)
Net gains (losses) on investment securities | $ 3,777 | $ (41,795) | $ 10,219 | $ (68,368)

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