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Investments in Equity Securities (Details) - USD ($) $ in Thousands | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2024 | Dec. 31, 2023
Debt Securities, Available-for-sale [Line Items] |  |
Equity securities | $ 1,048,126 | $ 1,090,347
Fair Value |  |
Debt Securities, Available-for-sale [Line Items] |  |
Cost | 949,553 | 949,332
Gross Unrealized, Gains | 168,682 | 194,881
Gross Unrealized, Losses | (70,109) | (53,866)
Equity securities | 1,048,126 | 1,090,347
Fair Value | Common stock |  |
Debt Securities, Available-for-sale [Line Items] |  |
Cost | 604,288 | 664,997
Gross Unrealized, Gains | 157,761 | 191,806
Gross Unrealized, Losses | (60,382) | (18,749)
Equity securities | 701,667 | 838,054
Fair Value | Preferred stocks |  |
Debt Securities, Available-for-sale [Line Items] |  |
Cost | 345,265 | 284,335
Gross Unrealized, Gains | 10,921 | 3,075
Gross Unrealized, Losses | (9,727) | (35,117)
Equity securities | 346,459 | 252,293
Carrying Value |  |
Debt Securities, Available-for-sale [Line Items] |  |
Equity securities | 1,048,126 | 1,090,347
Carrying Value | Common stock |  |
Debt Securities, Available-for-sale [Line Items] |  |
Equity securities | 701,667 | 838,054
Carrying Value | Preferred stocks |  |
Debt Securities, Available-for-sale [Line Items] |  |
Equity securities | $ 346,459 | $ 252,293

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