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Investments, Investments Temporarily Impaired (Details)
$ in Thousands
Dec. 31, 2024
USD ($)
Investment
Temporarily Impaired Investments [Abstract]  
Number of investments | Investment 346
Estimated Fair Value [Abstract]  
Less than 12 months of temporary impairment $ 811,068
More than 12 months of temporary impairment 52,015
Total temporary impairment 863,083
Unrealized Losses [Abstract]  
Less than 12 months of temporary impairment (3,296)
More than 12 months of temporary impairment (145)
Total temporary impairment $ (3,441)
Corporate Debt Securities [Member]  
Temporarily Impaired Investments [Abstract]  
Number of investments | Investment 274
Estimated Fair Value [Abstract]  
Less than 12 months of temporary impairment $ 488,949
More than 12 months of temporary impairment 27,713
Total temporary impairment 516,662
Unrealized Losses [Abstract]  
Less than 12 months of temporary impairment (2,463)
More than 12 months of temporary impairment (52)
Total temporary impairment $ (2,515)
Debt Securities Issued by U.S. Government Agencies [Member]  
Temporarily Impaired Investments [Abstract]  
Number of investments | Investment 30
Estimated Fair Value [Abstract]  
Less than 12 months of temporary impairment $ 67,854
More than 12 months of temporary impairment 0
Total temporary impairment 67,854
Unrealized Losses [Abstract]  
Less than 12 months of temporary impairment (328)
More than 12 months of temporary impairment 0
Total temporary impairment $ (328)
Debt Securities Issued by the U.S. Treasury [Member]  
Temporarily Impaired Investments [Abstract]  
Number of investments | Investment 38
Estimated Fair Value [Abstract]  
Less than 12 months of temporary impairment $ 252,926
More than 12 months of temporary impairment 24,173
Total temporary impairment 277,099
Unrealized Losses [Abstract]  
Less than 12 months of temporary impairment (503)
More than 12 months of temporary impairment (93)
Total temporary impairment $ (596)
Debt Securities Issued by States of the U.S. and Political Subdivisions of the States [Member]  
Temporarily Impaired Investments [Abstract]  
Number of investments | Investment 3
Estimated Fair Value [Abstract]  
Less than 12 months of temporary impairment $ 643
More than 12 months of temporary impairment 129
Total temporary impairment 772
Unrealized Losses [Abstract]  
Less than 12 months of temporary impairment 0
More than 12 months of temporary impairment 0
Total temporary impairment $ 0
Other Municipal Debt Securities [Member]  
Temporarily Impaired Investments [Abstract]  
Number of investments | Investment 1
Estimated Fair Value [Abstract]  
Less than 12 months of temporary impairment $ 696
More than 12 months of temporary impairment 0
Total temporary impairment 696
Unrealized Losses [Abstract]  
Less than 12 months of temporary impairment (2)
More than 12 months of temporary impairment 0
Total temporary impairment $ (2)