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Investments, Investments Temporarily Impaired (Details)
$ in Thousands
Jun. 30, 2022
USD ($)
Investment
Temporarily Impaired Investments [Abstract]  
Number of investments | Investment 845
Estimated Fair Value [Abstract]  
Less than 12 months of temporary impairment $ 1,310,175
More than 12 months of temporary impairment 76,946
Total temporary impairment 1,387,121
Unrealized Losses [Abstract]  
Less than 12 months of temporary impairment (21,736)
More than 12 months of temporary impairment (2,193)
Total temporary impairment $ (23,929)
Corporate Debt Securities [Member]  
Temporarily Impaired Investments [Abstract]  
Number of investments | Investment 380
Estimated Fair Value [Abstract]  
Less than 12 months of temporary impairment $ 703,643
More than 12 months of temporary impairment 42,106
Total temporary impairment 745,749
Unrealized Losses [Abstract]  
Less than 12 months of temporary impairment (14,199)
More than 12 months of temporary impairment (1,092)
Total temporary impairment $ (15,291)
Debt Securities Issued by U.S. Government Agencies [Member]  
Temporarily Impaired Investments [Abstract]  
Number of investments | Investment 11
Estimated Fair Value [Abstract]  
Less than 12 months of temporary impairment $ 65,974
More than 12 months of temporary impairment 14,400
Total temporary impairment 80,374
Unrealized Losses [Abstract]  
Less than 12 months of temporary impairment (1,781)
More than 12 months of temporary impairment (597)
Total temporary impairment $ (2,378)
Debt Securities Issued by the U.S. Treasury [Member]  
Temporarily Impaired Investments [Abstract]  
Number of investments | Investment 48
Estimated Fair Value [Abstract]  
Less than 12 months of temporary impairment $ 420,076
More than 12 months of temporary impairment 4,837
Total temporary impairment 424,913
Unrealized Losses [Abstract]  
Less than 12 months of temporary impairment (4,767)
More than 12 months of temporary impairment (162)
Total temporary impairment $ (4,929)
Debt Securities Issued by States of the U.S. and Political Subdivisions of the States [Member]  
Temporarily Impaired Investments [Abstract]  
Number of investments | Investment 403
Estimated Fair Value [Abstract]  
Less than 12 months of temporary impairment $ 119,174
More than 12 months of temporary impairment 10,617
Total temporary impairment 129,791
Unrealized Losses [Abstract]  
Less than 12 months of temporary impairment (975)
More than 12 months of temporary impairment (266)
Total temporary impairment $ (1,241)
Other Municipal Debt Securities [Member]  
Temporarily Impaired Investments [Abstract]  
Number of investments | Investment 3
Estimated Fair Value [Abstract]  
Less than 12 months of temporary impairment $ 1,308
More than 12 months of temporary impairment 4,986
Total temporary impairment 6,294
Unrealized Losses [Abstract]  
Less than 12 months of temporary impairment (14)
More than 12 months of temporary impairment (76)
Total temporary impairment $ (90)