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Investments, Investments Temporarily Impaired (Details)
$ in Thousands
Sep. 30, 2024
USD ($)
Investment
Temporarily Impaired Investments [Abstract]  
Number of investments | Investment 255
Estimated Fair Value [Abstract]  
Less than 12 months of temporary impairment $ 431,132
More than 12 months of temporary impairment 110,562
Total temporary impairment 541,694
Unrealized Losses [Abstract]  
Less than 12 months of temporary impairment (451)
More than 12 months of temporary impairment (311)
Total temporary impairment $ (762)
Corporate Debt Securities [Member]  
Temporarily Impaired Investments [Abstract]  
Number of investments | Investment 209
Estimated Fair Value [Abstract]  
Less than 12 months of temporary impairment $ 331,968
More than 12 months of temporary impairment 47,159
Total temporary impairment 379,127
Unrealized Losses [Abstract]  
Less than 12 months of temporary impairment (351)
More than 12 months of temporary impairment (174)
Total temporary impairment $ (525)
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 $ 49,966
More than 12 months of temporary impairment 3,068
Total temporary impairment 53,034
Unrealized Losses [Abstract]  
Less than 12 months of temporary impairment (70)
More than 12 months of temporary impairment (1)
Total temporary impairment $ (71)
Debt Securities Issued by the U.S. Treasury [Member]  
Temporarily Impaired Investments [Abstract]  
Number of investments | Investment 12
Estimated Fair Value [Abstract]  
Less than 12 months of temporary impairment $ 48,664
More than 12 months of temporary impairment 59,416
Total temporary impairment 108,080
Unrealized Losses [Abstract]  
Less than 12 months of temporary impairment (30)
More than 12 months of temporary impairment (134)
Total temporary impairment $ (164)
Debt Securities Issued by States of the U.S. and Political Subdivisions of the States [Member]  
Temporarily Impaired Investments [Abstract]  
Number of investments | Investment 8
Estimated Fair Value [Abstract]  
Less than 12 months of temporary impairment $ 534
More than 12 months of temporary impairment 919
Total temporary impairment 1,453
Unrealized Losses [Abstract]  
Less than 12 months of temporary impairment 0
More than 12 months of temporary impairment (2)
Total temporary impairment $ (2)