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Investments, Investments Temporarily Impaired (Details)
$ in Thousands
Dec. 31, 2022
USD ($)
Investment
Temporarily Impaired Investments [Abstract]  
Number of investments | Investment 619
Estimated Fair Value [Abstract]  
Less than 12 months of temporary impairment $ 1,112,941
More than 12 months of temporary impairment 499,383
Total temporary impairment 1,612,324
Unrealized Losses [Abstract]  
Less than 12 months of temporary impairment (9,474)
More than 12 months of temporary impairment (18,165)
Total temporary impairment $ (27,639)
Corporate Debt Securities [Member]  
Temporarily Impaired Investments [Abstract]  
Number of investments | Investment 384
Estimated Fair Value [Abstract]  
Less than 12 months of temporary impairment $ 384,136
More than 12 months of temporary impairment 305,367
Total temporary impairment 689,503
Unrealized Losses [Abstract]  
Less than 12 months of temporary impairment (2,629)
More than 12 months of temporary impairment (11,879)
Total temporary impairment $ (14,508)
Debt Securities Issued by U.S. Government Agencies [Member]  
Temporarily Impaired Investments [Abstract]  
Number of investments | Investment 48
Estimated Fair Value [Abstract]  
Less than 12 months of temporary impairment $ 93,862
More than 12 months of temporary impairment 70,233
Total temporary impairment 164,095
Unrealized Losses [Abstract]  
Less than 12 months of temporary impairment (538)
More than 12 months of temporary impairment (2,331)
Total temporary impairment $ (2,869)
Debt Securities Issued by the U.S. Treasury [Member]  
Temporarily Impaired Investments [Abstract]  
Number of investments | Investment 75
Estimated Fair Value [Abstract]  
Less than 12 months of temporary impairment $ 616,826
More than 12 months of temporary impairment 86,325
Total temporary impairment 703,151
Unrealized Losses [Abstract]  
Less than 12 months of temporary impairment (6,082)
More than 12 months of temporary impairment (3,151)
Total temporary impairment $ (9,233)
Debt Securities Issued by States of the U.S. and Political Subdivisions of the States [Member]  
Temporarily Impaired Investments [Abstract]  
Number of investments | Investment 110
Estimated Fair Value [Abstract]  
Less than 12 months of temporary impairment $ 18,117
More than 12 months of temporary impairment 31,465
Total temporary impairment 49,582
Unrealized Losses [Abstract]  
Less than 12 months of temporary impairment (225)
More than 12 months of temporary impairment (790)
Total temporary impairment $ (1,015)
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 $ 0
More than 12 months of temporary impairment 5,993
Total temporary impairment 5,993
Unrealized Losses [Abstract]  
Less than 12 months of temporary impairment 0
More than 12 months of temporary impairment (14)
Total temporary impairment $ (14)