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Investments, Investments Temporarily Impaired (Details)
$ in Thousands
Jun. 30, 2024
USD ($)
Investment
Temporarily Impaired Investments [Abstract]  
Number of investments | Investment 664
Estimated Fair Value [Abstract]  
Less than 12 months of temporary impairment $ 1,260,824
More than 12 months of temporary impairment 331,607
Total temporary impairment 1,592,431
Unrealized Losses [Abstract]  
Less than 12 months of temporary impairment (2,522)
More than 12 months of temporary impairment (2,838)
Total temporary impairment $ (5,360)
Corporate Debt Securities [Member]  
Temporarily Impaired Investments [Abstract]  
Number of investments | Investment 440
Estimated Fair Value [Abstract]  
Less than 12 months of temporary impairment $ 517,394
More than 12 months of temporary impairment 142,390
Total temporary impairment 659,784
Unrealized Losses [Abstract]  
Less than 12 months of temporary impairment (1,155)
More than 12 months of temporary impairment (1,288)
Total temporary impairment $ (2,443)
Debt Securities Issued by U.S. Government Agencies [Member]  
Temporarily Impaired Investments [Abstract]  
Number of investments | Investment 108
Estimated Fair Value [Abstract]  
Less than 12 months of temporary impairment $ 173,618
More than 12 months of temporary impairment 25,892
Total temporary impairment 199,510
Unrealized Losses [Abstract]  
Less than 12 months of temporary impairment (482)
More than 12 months of temporary impairment (145)
Total temporary impairment $ (627)
Debt Securities Issued by the U.S. Treasury [Member]  
Temporarily Impaired Investments [Abstract]  
Number of investments | Investment 71
Estimated Fair Value [Abstract]  
Less than 12 months of temporary impairment $ 561,363
More than 12 months of temporary impairment 154,006
Total temporary impairment 715,369
Unrealized Losses [Abstract]  
Less than 12 months of temporary impairment (862)
More than 12 months of temporary impairment (1,378)
Total temporary impairment $ (2,240)
Debt Securities Issued by States of the U.S. and Political Subdivisions of the States [Member]  
Temporarily Impaired Investments [Abstract]  
Number of investments | Investment 45
Estimated Fair Value [Abstract]  
Less than 12 months of temporary impairment $ 8,449
More than 12 months of temporary impairment 9,319
Total temporary impairment 17,768
Unrealized Losses [Abstract]  
Less than 12 months of temporary impairment (23)
More than 12 months of temporary impairment (27)
Total temporary impairment $ (50)