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Investments (Available-For-Sale Securities Disclosure) (Details) - USD ($) $ in Thousands | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
--- | --- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |  |
Fixed income securities, available-for-sale, amortized cost | $ 7,880,697 | $ 7,185,754 |
Fixed income securities, available-for-sale, allowance for credit loss | 28,212 | 45,721 | $ 9,724
Unrealized gains | 50,076 | 9,262 |
Unrealized losses | 403,364 | 537,188 |
Debt Securities, Available-for-sale, Fair Value | 7,499,197 | 6,612,107 |
U.S. Government and Government Agencies [Member] |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Fixed income securities, available-for-sale, amortized cost | 223,157 | 209,528 |
Fixed income securities, available-for-sale, allowance for credit loss | 0 | 0 |
Unrealized gains | 139 | 37 |
Unrealized losses | 18,261 | 20,326 |
Debt Securities, Available-for-sale, Fair Value | 205,035 | 189,239 |
Foreign Government [Member] |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Fixed income securities, available-for-sale, amortized cost | 11,140 | 11,199 |
Fixed income securities, available-for-sale, allowance for credit loss | 35 | 284 | 46
Unrealized gains | 0 | 0 |
Unrealized losses | 1,302 | 1,307 |
Debt Securities, Available-for-sale, Fair Value | 9,803 | 9,608 |
Obligations of States and Political Subdivisions [Member] |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Fixed income securities, available-for-sale, amortized cost | 612,938 | 965,231 |
Fixed income securities, available-for-sale, allowance for credit loss | 669 | 1,024 | 137
Unrealized gains | 2,623 | 1,812 |
Unrealized losses | 28,927 | 48,001 |
Debt Securities, Available-for-sale, Fair Value | 585,965 | 918,018 |
Corporate Securities [Member] |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Fixed income securities, available-for-sale, amortized cost | 2,834,048 | 2,558,655 |
Fixed income securities, available-for-sale, allowance for credit loss | 12,999 | 30,330 | 6,682
Unrealized gains | 28,078 | 3,509 |
Unrealized losses | 137,888 | 196,809 |
Debt Securities, Available-for-sale, Fair Value | 2,711,239 | 2,335,025 |
Collateralized Loan Obligations and Other Asset-Backed Securities [Member] |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Fixed income securities, available-for-sale, amortized cost | 1,911,831 | 1,607,660 |
Fixed income securities, available-for-sale, allowance for credit loss | 2,854 | 2,375 | 939
Unrealized gains | 11,855 | 2,408 |
Unrealized losses | 86,005 | 121,720 |
Debt Securities, Available-for-sale, Fair Value | 1,834,827 | 1,485,973 |
Residential Mortgage Backed Securities [Member] |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Fixed income securities, available-for-sale, amortized cost | 1,568,960 | 1,169,546 |
Fixed income securities, available-for-sale, allowance for credit loss | 11,649 | 11,597 | 1,909
Unrealized gains | 6,023 | 1,148 |
Unrealized losses | 85,851 | 99,265 |
Debt Securities, Available-for-sale, Fair Value | 1,477,483 | 1,059,832 |
Commercial Mortgage Backed Securities [Member] |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Fixed income securities, available-for-sale, amortized cost | 718,623 | 663,935 |
Fixed income securities, available-for-sale, allowance for credit loss | 6 | 111 | $ 11
Unrealized gains | 1,358 | 348 |
Unrealized losses | 45,130 | 49,760 |
Debt Securities, Available-for-sale, Fair Value | $ 674,845 | $ 614,412 |

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