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Investments in Equity Securities (Investments in Equity Securities Available for Sale) (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022
Fair Value |  |
Debt Securities, Available-for-sale [Line Items] |  |
Cost | $ 949,332 | $ 1,115,328
Gross unrealized gains | 194,881 | 193,218
Gross unrealized losses | (53,866) | (122,652)
Equity securities | 1,090,347 | 1,185,894
Fair Value | Common stocks |  |
Debt Securities, Available-for-sale [Line Items] |  |
Cost | 664,997 | 855,987
Gross unrealized gains | 191,806 | 192,165
Gross unrealized losses | (18,749) | (65,401)
Equity securities | 838,054 | 982,751
Fair Value | Preferred stocks |  |
Debt Securities, Available-for-sale [Line Items] |  |
Cost | 284,335 | 259,341
Gross unrealized gains | 3,075 | 1,053
Gross unrealized losses | (35,117) | (57,251)
Equity securities | 252,293 | 203,143
Carrying Value |  |
Debt Securities, Available-for-sale [Line Items] |  |
Equity securities | 1,090,347 | 1,185,894
Carrying Value | Common stocks |  |
Debt Securities, Available-for-sale [Line Items] |  |
Equity securities | 838,054 | 982,751
Carrying Value | Preferred stocks |  |
Debt Securities, Available-for-sale [Line Items] |  |
Equity securities | $ 252,293 | $ 203,143

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