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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		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Equity securities:
Net gains from equity securities sold	$ 13,438	$ 4,209	$ 27,371	$ 20,352
Net gains (losses) on equity securities still held	(2,070)	9,358	6,302	4,273
Total net gains on equity securities	11,368	13,567	33,673	24,625
Available-for-sale debt securities:
Net gains on debt securities	8	203	18	7,701
Net gains on investment securities	$ 11,376	$ 13,770	$ 33,691	$ 32,326

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

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