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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
	Mar. 31, 2025	Mar. 31, 2024
Equity securities:
Net gains from equity securities sold	$ 6,992	$ 9,871
Net (losses) from equity securities still held	(8,243)	(1,205)
Total net gains (losses) on equity securities	(1,251)	8,666
Available-for-sale debt securities:
Net gains on debt securities	10	9,332
Net gains (losses) on investment securities	$ (1,241)	$ 17,998

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Amount of unrealized and realized gain (loss) on investment in debt and equity securities.

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