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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, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024
Equity securities:
Net gains from equity securities sold	$ 6,940	$ 6,272	$ 13,932	$ 16,143
Net gains (losses) on equity securities still held	16,616	(3,880)	8,373	(5,085)
Total net gains on equity securities	23,556	2,392	22,305	11,058
Available-for-sale debt securities:
Net gains (losses) on debt securities	0	(1,834)	10	7,498
Net gains on investment securities	$ 23,556	$ 558	$ 22,315	$ 18,556

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

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