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Investments in Equity Securities (Details) - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2025	Dec. 31, 2024
Debt Securities, Available-for-sale [Line Items]
Equity securities	$ 1,382,432	$ 1,203,788
Fair Value
Debt Securities, Available-for-sale [Line Items]
Cost	1,027,451	941,974
Gross Unrealized, Gains	368,633	346,697
Gross Unrealized, Losses	(13,652)	(84,883)
Equity securities	1,382,432	1,203,788
Fair Value | Common stock
Debt Securities, Available-for-sale [Line Items]
Cost	571,667	612,479
Gross Unrealized, Gains	159,201	223,981
Gross Unrealized, Losses	(8,918)	(76,293)
Equity securities	721,950	760,167
Fair Value | Preferred stocks
Debt Securities, Available-for-sale [Line Items]
Cost	455,784	329,495
Gross Unrealized, Gains	209,432	122,716
Gross Unrealized, Losses	(4,734)	(8,590)
Equity securities	660,482	443,621
Carrying Value
Debt Securities, Available-for-sale [Line Items]
Equity securities	1,382,432	1,203,788
Carrying Value | Common stock
Debt Securities, Available-for-sale [Line Items]
Equity securities	721,950	760,167
Carrying Value | Preferred stocks
Debt Securities, Available-for-sale [Line Items]
Equity securities	$ 660,482	$ 443,621

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Amount of investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI), classified as current.

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