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Investments, Investments Temporarily Impaired (Details)
$ in Thousands
Mar. 31, 2023
USD ($)
Investment
Temporarily Impaired Investments [Abstract]  
Number of investments | Investment 603
Estimated Fair Value [Abstract]  
Less than 12 months of temporary impairment $ 1,198,933
More than 12 months of temporary impairment 486,918
Total temporary impairment 1,685,851
Unrealized Losses [Abstract]  
Less than 12 months of temporary impairment (6,134)
More than 12 months of temporary impairment (14,173)
Total temporary impairment $ (20,307)
Corporate Debt Securities [Member]  
Temporarily Impaired Investments [Abstract]  
Number of investments | Investment 361
Estimated Fair Value [Abstract]  
Less than 12 months of temporary impairment $ 434,500
More than 12 months of temporary impairment 291,713
Total temporary impairment 726,213
Unrealized Losses [Abstract]  
Less than 12 months of temporary impairment (1,697)
More than 12 months of temporary impairment (9,534)
Total temporary impairment $ (11,231)
Debt Securities Issued by U.S. Government Agencies [Member]  
Temporarily Impaired Investments [Abstract]  
Number of investments | Investment 68
Estimated Fair Value [Abstract]  
Less than 12 months of temporary impairment $ 138,211
More than 12 months of temporary impairment 70,965
Total temporary impairment 209,176
Unrealized Losses [Abstract]  
Less than 12 months of temporary impairment (424)
More than 12 months of temporary impairment (1,508)
Total temporary impairment $ (1,932)
Debt Securities Issued by the U.S. Treasury [Member]  
Temporarily Impaired Investments [Abstract]  
Number of investments | Investment 64
Estimated Fair Value [Abstract]  
Less than 12 months of temporary impairment $ 603,444
More than 12 months of temporary impairment 91,448
Total temporary impairment 694,892
Unrealized Losses [Abstract]  
Less than 12 months of temporary impairment (3,873)
More than 12 months of temporary impairment (2,591)
Total temporary impairment $ (6,464)
Debt Securities Issued by States of the U.S. and Political Subdivisions of the States [Member]  
Temporarily Impaired Investments [Abstract]  
Number of investments | Investment 110
Estimated Fair Value [Abstract]  
Less than 12 months of temporary impairment $ 22,778
More than 12 months of temporary impairment 32,792
Total temporary impairment 55,570
Unrealized Losses [Abstract]  
Less than 12 months of temporary impairment (140)
More than 12 months of temporary impairment (540)
Total temporary impairment $ (680)