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Investments (Available-For-Sale Securities by Contractual Maturity) (Details) - USD ($) $ in Thousands | Mar. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Debt Securities, Available-for-Sale [Line Items] |  |
Amortized Cost | $ 3,813,857 | $ 3,758,720
Total Fair Value | 3,544,137 | 3,493,597
U.S. Treasury obligations |  |
Debt Securities, Available-for-Sale [Line Items] |  |
Amortized Cost | 258,462 | 259,834
Due in one year or less | 36,249 |
Due after one year through five years | 169,651 |
Due after five years through ten years | 32,387 |
Due after ten years | 2,602 |
Total Fair Value | 240,889 | 243,525
U.S. Government-sponsored enterprise obligations |  |
Debt Securities, Available-for-Sale [Line Items] |  |
Amortized Cost | 19,957 | 19,752
Due in one year or less | 4,790 |
Due after one year through five years | 11,653 |
Due after five years through ten years | 505 |
Due after ten years | 1,979 |
Total Fair Value | 18,927 | 18,724
State and municipal bonds |  |
Debt Securities, Available-for-Sale [Line Items] |  |
Amortized Cost | 502,549 | 482,367
Due in one year or less | 30,409 |
Due after one year through five years | 157,707 |
Due after five years through ten years | 161,274 |
Due after ten years | 124,875 |
Total Fair Value | 474,265 | 454,381
Corporate debt |  |
Debt Securities, Available-for-Sale [Line Items] |  |
Amortized Cost | 1,849,162 | 1,883,308
Due in one year or less | 179,206 |
Due after one year through five years | 886,529 |
Due after five years through ten years | 569,033 |
Due after ten years | 79,284 |
Total Fair Value | 1,714,052 | 1,750,574
Residential mortgage-backed securities |  |
Debt Securities, Available-for-Sale [Line Items] |  |
Amortized Cost | 507,312 | 481,267
Total Fair Value | 450,052 | 430,137
Agency commercial mortgage-backed securities |  |
Debt Securities, Available-for-Sale [Line Items] |  |
Amortized Cost | 8,964 | 9,369
Total Fair Value | 7,950 | 8,387
Other commercial mortgage-backed securities |  |
Debt Securities, Available-for-Sale [Line Items] |  |
Amortized Cost | 248,756 | 210,469
Total Fair Value | 229,029 | 189,474
Other asset-backed securities |  |
Debt Securities, Available-for-Sale [Line Items] |  |
Amortized Cost | 418,695 | 412,354
Total Fair Value | $ 408,973 | $ 398,395

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