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Investments, Investments Temporarily Impaired (Details)
$ in Thousands
Mar. 31, 2024
USD ($)
Investment
Temporarily Impaired Investments [Abstract]  
Number of investments | Investment 589
Estimated Fair Value [Abstract]  
Less than 12 months of temporary impairment $ 1,261,831
More than 12 months of temporary impairment 201,069
Total temporary impairment 1,462,900
Unrealized Losses [Abstract]  
Less than 12 months of temporary impairment (3,516)
More than 12 months of temporary impairment (2,498)
Total temporary impairment $ (6,014)
Corporate Debt Securities [Member]  
Temporarily Impaired Investments [Abstract]  
Number of investments | Investment 392
Estimated Fair Value [Abstract]  
Less than 12 months of temporary impairment $ 487,939
More than 12 months of temporary impairment 96,219
Total temporary impairment 584,158
Unrealized Losses [Abstract]  
Less than 12 months of temporary impairment (1,361)
More than 12 months of temporary impairment (1,519)
Total temporary impairment $ (2,880)
Debt Securities Issued by U.S. Government Agencies [Member]  
Temporarily Impaired Investments [Abstract]  
Number of investments | Investment 80
Estimated Fair Value [Abstract]  
Less than 12 months of temporary impairment $ 176,956
More than 12 months of temporary impairment 12,375
Total temporary impairment 189,331
Unrealized Losses [Abstract]  
Less than 12 months of temporary impairment (360)
More than 12 months of temporary impairment (236)
Total temporary impairment $ (596)
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 $ 588,958
More than 12 months of temporary impairment 86,772
Total temporary impairment 675,730
Unrealized Losses [Abstract]  
Less than 12 months of temporary impairment (1,773)
More than 12 months of temporary impairment (685)
Total temporary impairment $ (2,458)
Debt Securities Issued by States of the U.S. and Political Subdivisions of the States [Member]  
Temporarily Impaired Investments [Abstract]  
Number of investments | Investment 53
Estimated Fair Value [Abstract]  
Less than 12 months of temporary impairment $ 7,978
More than 12 months of temporary impairment 5,703
Total temporary impairment 13,681
Unrealized Losses [Abstract]  
Less than 12 months of temporary impairment (22)
More than 12 months of temporary impairment (58)
Total temporary impairment $ (80)