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Investments, Investments Temporarily Impaired (Details)
$ in Thousands
Mar. 31, 2022
USD ($)
Investment
Temporarily Impaired Investments [Abstract]  
Number of investments | Investment 1,017
Estimated Fair Value [Abstract]  
Less than 12 months of temporary impairment $ 1,324,532
More than 12 months of temporary impairment 36,305
Total temporary impairment 1,360,837
Unrealized Losses [Abstract]  
Less than 12 months of temporary impairment (18,042)
More than 12 months of temporary impairment (992)
Total temporary impairment $ (19,034)
Corporate Debt Securities [Member]  
Temporarily Impaired Investments [Abstract]  
Number of investments | Investment 337
Estimated Fair Value [Abstract]  
Less than 12 months of temporary impairment $ 647,390
More than 12 months of temporary impairment 11,300
Total temporary impairment 658,690
Unrealized Losses [Abstract]  
Less than 12 months of temporary impairment (11,694)
More than 12 months of temporary impairment (347)
Total temporary impairment $ (12,041)
Debt Securities Issued by U.S. Government Agencies [Member]  
Temporarily Impaired Investments [Abstract]  
Number of investments | Investment 14
Estimated Fair Value [Abstract]  
Less than 12 months of temporary impairment $ 95,543
More than 12 months of temporary impairment 9,685
Total temporary impairment 105,228
Unrealized Losses [Abstract]  
Less than 12 months of temporary impairment (1,697)
More than 12 months of temporary impairment (326)
Total temporary impairment $ (2,023)
Debt Securities Issued by the U.S. Treasury [Member]  
Temporarily Impaired Investments [Abstract]  
Number of investments | Investment 44
Estimated Fair Value [Abstract]  
Less than 12 months of temporary impairment $ 406,747
More than 12 months of temporary impairment 4,860
Total temporary impairment 411,607
Unrealized Losses [Abstract]  
Less than 12 months of temporary impairment (3,539)
More than 12 months of temporary impairment (138)
Total temporary impairment $ (3,677)
Debt Securities Issued by States of the U.S. and Political Subdivisions of the States [Member]  
Temporarily Impaired Investments [Abstract]  
Number of investments | Investment 619
Estimated Fair Value [Abstract]  
Less than 12 months of temporary impairment $ 173,537
More than 12 months of temporary impairment 5,455
Total temporary impairment 178,992
Unrealized Losses [Abstract]  
Less than 12 months of temporary impairment (1,096)
More than 12 months of temporary impairment (98)
Total temporary impairment $ (1,194)
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 $ 1,315
More than 12 months of temporary impairment 5,005
Total temporary impairment 6,320
Unrealized Losses [Abstract]  
Less than 12 months of temporary impairment (16)
More than 12 months of temporary impairment (83)
Total temporary impairment $ (99)