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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, 2023 | Mar. 31, 2022
Equity securities: |  |
Net gains (losses) from equity securities sold | $ (844) | $ 5,006
Net gains (losses) from equity securities still held | 7,477 | (22,035)
Total net gains (losses) on equity securities | 6,633 | (17,029)
Available-for-sale debt securities: |  |
Net (losses) on debt securities | (191) | (9,544)
Net gains (losses) on investment securities | $ 6,442 | $ (26,573)

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