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Investments, Investments Temporarily Impaired (Details)
$ in Thousands
Sep. 30, 2022
USD ($)
Investment
Temporarily Impaired Investments [Abstract]  
Number of investments | Investment 644
Estimated Fair Value [Abstract]  
Less than 12 months of temporary impairment $ 1,345,270
More than 12 months of temporary impairment 266,568
Total temporary impairment 1,611,838
Unrealized Losses [Abstract]  
Less than 12 months of temporary impairment (20,769)
More than 12 months of temporary impairment (11,860)
Total temporary impairment $ (32,629)
Corporate Debt Securities [Member]  
Temporarily Impaired Investments [Abstract]  
Number of investments | Investment 397
Estimated Fair Value [Abstract]  
Less than 12 months of temporary impairment $ 591,245
More than 12 months of temporary impairment 133,763
Total temporary impairment 725,008
Unrealized Losses [Abstract]  
Less than 12 months of temporary impairment (10,897)
More than 12 months of temporary impairment (7,084)
Total temporary impairment $ (17,981)
Debt Securities Issued by U.S. Government Agencies [Member]  
Temporarily Impaired Investments [Abstract]  
Number of investments | Investment 31
Estimated Fair Value [Abstract]  
Less than 12 months of temporary impairment $ 69,640
More than 12 months of temporary impairment 53,299
Total temporary impairment 122,939
Unrealized Losses [Abstract]  
Less than 12 months of temporary impairment (875)
More than 12 months of temporary impairment (2,352)
Total temporary impairment $ (3,227)
Debt Securities Issued by the U.S. Treasury [Member]  
Temporarily Impaired Investments [Abstract]  
Number of investments | Investment 74
Estimated Fair Value [Abstract]  
Less than 12 months of temporary impairment $ 643,231
More than 12 months of temporary impairment 52,767
Total temporary impairment 695,998
Unrealized Losses [Abstract]  
Less than 12 months of temporary impairment (8,327)
More than 12 months of temporary impairment (1,681)
Total temporary impairment $ (10,008)
Debt Securities Issued by States of the U.S. and Political Subdivisions of the States [Member]  
Temporarily Impaired Investments [Abstract]  
Number of investments | Investment 140
Estimated Fair Value [Abstract]  
Less than 12 months of temporary impairment $ 40,160
More than 12 months of temporary impairment 21,769
Total temporary impairment 61,929
Unrealized Losses [Abstract]  
Less than 12 months of temporary impairment (658)
More than 12 months of temporary impairment (679)
Total temporary impairment $ (1,337)
Other Municipal Debt Securities [Member]  
Temporarily Impaired Investments [Abstract]  
Number of investments | Investment 2
Estimated Fair Value [Abstract]  
Less than 12 months of temporary impairment $ 994
More than 12 months of temporary impairment 4,970
Total temporary impairment 5,964
Unrealized Losses [Abstract]  
Less than 12 months of temporary impairment (12)
More than 12 months of temporary impairment (64)
Total temporary impairment $ (76)