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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