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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
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Jun. 30, 2022 | Jun. 30, 2021 | Jun. 30, 2022 | Jun. 30, 2021
Equity securities: |  |  |  |
Net gains (losses) from equity securities sold | $ (1,061) | $ 4,218 | $ 3,945 | $ 6,240
Net gains (losses) from equity securities still held | (26,224) | 8,707 | (48,259) | 5,541
Total net gains (losses) on equity securities | (27,285) | 12,925 | (44,314) | 11,781
Available-for-sale debt securities: |  |  |  |
Net gains (losses) on debt securities | (14,510) | 267 | (24,054) | 2,379
Net gains (losses) on investment securities | $ (41,795) | $ 13,192 | $ (68,368) | $ 14,160

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