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Investments, Investments Temporarily Impaired (Details)
$ in Thousands
Dec. 31, 2023
USD ($)
Investment
Temporarily Impaired Investments [Abstract]  
Number of investments | Investment 455
Estimated Fair Value [Abstract]  
Less than 12 months of temporary impairment $ 857,398
More than 12 months of temporary impairment 331,848
Total temporary impairment 1,189,246
Unrealized Losses [Abstract]  
Less than 12 months of temporary impairment (1,847)
More than 12 months of temporary impairment (4,588)
Total temporary impairment $ (6,435)
Corporate Debt Securities [Member]  
Temporarily Impaired Investments [Abstract]  
Number of investments | Investment 297
Estimated Fair Value [Abstract]  
Less than 12 months of temporary impairment $ 323,708
More than 12 months of temporary impairment 178,183
Total temporary impairment 501,891
Unrealized Losses [Abstract]  
Less than 12 months of temporary impairment (553)
More than 12 months of temporary impairment (2,764)
Total temporary impairment $ (3,317)
Debt Securities Issued by U.S. Government Agencies [Member]  
Temporarily Impaired Investments [Abstract]  
Number of investments | Investment 63
Estimated Fair Value [Abstract]  
Less than 12 months of temporary impairment $ 199,372
More than 12 months of temporary impairment 14,777
Total temporary impairment 214,149
Unrealized Losses [Abstract]  
Less than 12 months of temporary impairment (246)
More than 12 months of temporary impairment (386)
Total temporary impairment $ (632)
Debt Securities Issued by the U.S. Treasury [Member]  
Temporarily Impaired Investments [Abstract]  
Number of investments | Investment 34
Estimated Fair Value [Abstract]  
Less than 12 months of temporary impairment $ 325,966
More than 12 months of temporary impairment 131,000
Total temporary impairment 456,966
Unrealized Losses [Abstract]  
Less than 12 months of temporary impairment (1,031)
More than 12 months of temporary impairment (1,338)
Total temporary impairment $ (2,369)
Debt Securities Issued by States of the U.S. and Political Subdivisions of the States [Member]  
Temporarily Impaired Investments [Abstract]  
Number of investments | Investment 61
Estimated Fair Value [Abstract]  
Less than 12 months of temporary impairment $ 8,352
More than 12 months of temporary impairment 7,888
Total temporary impairment 16,240
Unrealized Losses [Abstract]  
Less than 12 months of temporary impairment (17)
More than 12 months of temporary impairment (100)
Total temporary impairment $ (117)