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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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