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Investments (Summary of Gross Unrealized Gain (Loss) on Investments) (Details) - USD ($)
$ in Thousands
Jun. 30, 2023
Dec. 31, 2022
Investments, Unrealized Loss Position, Fair Value    
Investments, Fair Value 12 months or less $ 26,770 $ 307,363
Investments, Fair Value Longer than 12 months 237,338 79,321
Investments, Total Fair Value 264,108 386,684
Investments, Unrealized Losses    
Investments, Unrealized Losses 12 months or less (375) (10,863)
Investments, Unrealized Losses Longer than 12 months (8,991) (3,196)
Investments, Total Unrealized Losses (9,366) (14,059)
Debt Securities [Member]    
Debt Securities, Unrealized Loss Position, Fair Value    
Debt securities, Fair Value 12 months or less 24,064 299,245
Debt securities, Fair Value Longer than 12 months 230,326 76,110
Debt securities, Total Fair Value 254,390 375,355
Debt securities, Unrealized Losses    
Debt securities, Unrealized Losses 12 months or less (297) (7,028)
Debt securities, Unrealized Losses Longer than 12 months (4,368) (1,191)
Debt securities, Total Unrealized Losses 4,665 8,219
Debt Securities [Member] | U.S. Treasury securities and obligations of U.S. Government [Member]    
Debt Securities, Unrealized Loss Position, Fair Value    
Debt securities, Fair Value 12 months or less 0 17,543
Debt securities, Fair Value Longer than 12 months 22,231 37,622
Debt securities, Total Fair Value 22,231 55,165
Debt securities, Unrealized Losses    
Debt securities, Unrealized Losses 12 months or less 0 (67)
Debt securities, Unrealized Losses Longer than 12 months (218) (580)
Debt securities, Total Unrealized Losses 218 647
Debt Securities [Member] | Corporate bonds [Member]    
Debt Securities, Unrealized Loss Position, Fair Value    
Debt securities, Fair Value 12 months or less 12,603 232,722
Debt securities, Fair Value Longer than 12 months 173,042 99
Debt securities, Total Fair Value 185,645 232,821
Debt securities, Unrealized Losses    
Debt securities, Unrealized Losses 12 months or less (211) (5,764)
Debt securities, Unrealized Losses Longer than 12 months (3,364) (2)
Debt securities, Total Unrealized Losses 3,575 5,766
Debt Securities [Member] | Corporate bank loans [Member]    
Debt Securities, Unrealized Loss Position, Fair Value    
Debt securities, Fair Value 12 months or less 6,991 37,339
Debt securities, Fair Value Longer than 12 months 27,580 36,107
Debt securities, Total Fair Value 34,571 73,446
Debt securities, Unrealized Losses    
Debt securities, Unrealized Losses 12 months or less (32) (678)
Debt securities, Unrealized Losses Longer than 12 months (261) (563)
Debt securities, Total Unrealized Losses 293 1,241
Debt Securities [Member] | Municipal bonds [Member]    
Debt Securities, Unrealized Loss Position, Fair Value    
Debt securities, Fair Value 12 months or less 4,430 10,293
Debt securities, Fair Value Longer than 12 months 6,288 2,275
Debt securities, Total Fair Value 10,718 12,568
Debt securities, Unrealized Losses    
Debt securities, Unrealized Losses 12 months or less (52) (383)
Debt securities, Unrealized Losses Longer than 12 months (306) (40)
Debt securities, Total Unrealized Losses 358 423
Debt Securities [Member] | Mortgage-backed [Member]    
Debt Securities, Unrealized Loss Position, Fair Value    
Debt securities, Fair Value 12 months or less 40 1,348
Debt securities, Fair Value Longer than 12 months 1,185 7
Debt securities, Total Fair Value 1,225 1,355
Debt securities, Unrealized Losses    
Debt securities, Unrealized Losses 12 months or less (2) (136)
Debt securities, Unrealized Losses Longer than 12 months (219) (6)
Debt securities, Total Unrealized Losses 221 142
Equity Securities [Member]    
Equity Securities, Unrealized Loss Position, Fair Value    
Equity securities, Fair Value 12 months or less 2,706 8,118
Equity securities, Fair Value Longer than 12 months 7,012 3,211
Equity securities, Total Fair Value 9,718 11,329
Equity Securities, Unrealized Loss    
Equity securities, Unrealized Losses 12 months or less (78) (3,835)
Equity securities, Unrealized Losses Longer than 12 months (4,623) (2,005)
Equity securities, Total Unrealized Losses $ (4,701) $ (5,840)