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Investments in Equity Securities (Investments in Equity Securities Available for Sale) (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023
Fair Value |  |
Debt Securities, Available-for-sale [Line Items] |  |
Cost | $ 941,974 | $ 949,332
Gross unrealized gains | 346,697 | 194,881
Gross unrealized losses | (84,883) | (53,866)
Equity securities | 1,203,788 | 1,090,347
Fair Value | Common stocks |  |
Debt Securities, Available-for-sale [Line Items] |  |
Cost | 612,479 | 664,997
Gross unrealized gains | 223,981 | 191,806
Gross unrealized losses | (76,293) | (18,749)
Equity securities | 760,167 | 838,054
Fair Value | Preferred stocks |  |
Debt Securities, Available-for-sale [Line Items] |  |
Cost | 329,495 | 284,335
Gross unrealized gains | 122,716 | 3,075
Gross unrealized losses | (8,590) | (35,117)
Equity securities | 443,621 | 252,293
Carrying Value |  |
Debt Securities, Available-for-sale [Line Items] |  |
Equity securities | 1,203,788 | 1,090,347
Carrying Value | Common stocks |  |
Debt Securities, Available-for-sale [Line Items] |  |
Equity securities | 760,167 | 838,054
Carrying Value | Preferred stocks |  |
Debt Securities, Available-for-sale [Line Items] |  |
Equity securities | $ 443,621 | $ 252,293

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