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Investments, Investments Temporarily Impaired (Details)
$ in Thousands
Mar. 31, 2025
USD ($)
Investment
Temporarily Impaired Investments [Abstract]  
Number of investments | Investment 312
Estimated Fair Value [Abstract]  
Less than 12 months of temporary impairment $ 783,821
More than 12 months of temporary impairment 22,876
Total temporary impairment 806,697
Unrealized Losses [Abstract]  
Less than 12 months of temporary impairment (1,650)
More than 12 months of temporary impairment (76)
Total temporary impairment $ (1,726)
Corporate Debt Securities [Member]  
Temporarily Impaired Investments [Abstract]  
Number of investments | Investment 244
Estimated Fair Value [Abstract]  
Less than 12 months of temporary impairment $ 466,130
More than 12 months of temporary impairment 9,945
Total temporary impairment 476,075
Unrealized Losses [Abstract]  
Less than 12 months of temporary impairment (1,236)
More than 12 months of temporary impairment (20)
Total temporary impairment $ (1,256)
Debt Securities Issued by U.S. Government Agencies [Member]  
Temporarily Impaired Investments [Abstract]  
Number of investments | Investment 26
Estimated Fair Value [Abstract]  
Less than 12 months of temporary impairment $ 45,578
More than 12 months of temporary impairment 0
Total temporary impairment 45,578
Unrealized Losses [Abstract]  
Less than 12 months of temporary impairment (148)
More than 12 months of temporary impairment 0
Total temporary impairment $ (148)
Debt Securities Issued by the U.S. Treasury [Member]  
Temporarily Impaired Investments [Abstract]  
Number of investments | Investment 40
Estimated Fair Value [Abstract]  
Less than 12 months of temporary impairment $ 271,642
More than 12 months of temporary impairment 12,931
Total temporary impairment 284,573
Unrealized Losses [Abstract]  
Less than 12 months of temporary impairment (266)
More than 12 months of temporary impairment (56)
Total temporary impairment $ (322)
Debt Securities Issued by States of the U.S. and Political Subdivisions of the States [Member]  
Temporarily Impaired Investments [Abstract]  
Number of investments | Investment 2
Estimated Fair Value [Abstract]  
Less than 12 months of temporary impairment $ 471
More than 12 months of temporary impairment 0
Total temporary impairment 471
Unrealized Losses [Abstract]  
Less than 12 months of temporary impairment 0
More than 12 months of temporary impairment 0
Total temporary impairment $ 0