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Investments, Investments Temporarily Impaired (Details)
$ in Thousands
Jun. 30, 2023
USD ($)
Investment
Temporarily Impaired Investments [Abstract]  
Number of investments | Investment 692
Estimated Fair Value [Abstract]  
Less than 12 months of temporary impairment $ 1,477,861
More than 12 months of temporary impairment 400,433
Total temporary impairment 1,878,294
Unrealized Losses [Abstract]  
Less than 12 months of temporary impairment (9,974)
More than 12 months of temporary impairment (11,302)
Total temporary impairment $ (21,276)
Corporate Debt Securities [Member]  
Temporarily Impaired Investments [Abstract]  
Number of investments | Investment 406
Estimated Fair Value [Abstract]  
Less than 12 months of temporary impairment $ 512,975
More than 12 months of temporary impairment 238,238
Total temporary impairment 751,213
Unrealized Losses [Abstract]  
Less than 12 months of temporary impairment (2,381)
More than 12 months of temporary impairment (7,517)
Total temporary impairment $ (9,898)
Debt Securities Issued by U.S. Government Agencies [Member]  
Temporarily Impaired Investments [Abstract]  
Number of investments | Investment 86
Estimated Fair Value [Abstract]  
Less than 12 months of temporary impairment $ 265,446
More than 12 months of temporary impairment 36,037
Total temporary impairment 301,483
Unrealized Losses [Abstract]  
Less than 12 months of temporary impairment (1,208)
More than 12 months of temporary impairment (976)
Total temporary impairment $ (2,184)
Debt Securities Issued by the U.S. Treasury [Member]  
Temporarily Impaired Investments [Abstract]  
Number of investments | Investment 70
Estimated Fair Value [Abstract]  
Less than 12 months of temporary impairment $ 674,046
More than 12 months of temporary impairment 103,565
Total temporary impairment 777,611
Unrealized Losses [Abstract]  
Less than 12 months of temporary impairment (6,202)
More than 12 months of temporary impairment (2,488)
Total temporary impairment $ (8,690)
Debt Securities Issued by States of the U.S. and Political Subdivisions of the States [Member]  
Temporarily Impaired Investments [Abstract]  
Number of investments | Investment 130
Estimated Fair Value [Abstract]  
Less than 12 months of temporary impairment $ 25,394
More than 12 months of temporary impairment 22,593
Total temporary impairment 47,987
Unrealized Losses [Abstract]  
Less than 12 months of temporary impairment (183)
More than 12 months of temporary impairment (321)
Total temporary impairment $ (504)