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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, 2022 | Mar. 31, 2021
Equity securities: |  |
Net gains from equity securities sold | $ 5,006 | $ 2,022
Net (losses) from equity securities still held | (22,035) | (3,166)
Total net (losses) on equity securities | (17,029) | (1,144)
Available-for-sale debt securities: |  |
Net gains (losses) on debt securities | (9,544) | 2,112
Net gains (losses) on investment securities | $ (26,573) | $ 968

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