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Investments (Summary of Gross Unrealized Gain (Loss) on Investments) (Details) - USD ($)
$ in Thousands
Sep. 30, 2023
Dec. 31, 2022
Investments, Unrealized Loss Position, Fair Value    
Investments, Fair Value 12 months or less $ 37,649 $ 307,363
Investments, Fair Value Longer than 12 months 199,377 79,321
Investments, Total Fair Value 237,026 386,684
Investments, Unrealized Losses    
Investments, Unrealized Losses 12 months or less (376) (10,863)
Investments, Unrealized Losses Longer than 12 months (8,325) (3,196)
Investments, Total Unrealized Losses (8,701) (14,059)
Debt Securities [Member]    
Debt Securities, Unrealized Loss Position, Fair Value    
Debt securities, Fair Value 12 months or less 36,761 299,245
Debt securities, Fair Value Longer than 12 months 194,122 76,110
Debt securities, Total Fair Value 230,883 375,355
Debt securities, Unrealized Losses    
Debt securities, Unrealized Losses 12 months or less (311) (7,028)
Debt securities, Unrealized Losses Longer than 12 months (3,334) (1,191)
Debt securities, Total Unrealized Losses 3,645 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 21,536 17,543
Debt securities, Fair Value Longer than 12 months 1,141 37,622
Debt securities, Total Fair Value 22,677 55,165
Debt securities, Unrealized Losses    
Debt securities, Unrealized Losses 12 months or less (191) (67)
Debt securities, Unrealized Losses Longer than 12 months (21) (580)
Debt securities, Total Unrealized Losses 212 647
Debt Securities [Member] | Corporate bonds [Member]    
Debt Securities, Unrealized Loss Position, Fair Value    
Debt securities, Fair Value 12 months or less 3,845 232,722
Debt securities, Fair Value Longer than 12 months 162,274 99
Debt securities, Total Fair Value 166,119 232,821
Debt securities, Unrealized Losses    
Debt securities, Unrealized Losses 12 months or less (64) (5,764)
Debt securities, Unrealized Losses Longer than 12 months (2,341) (2)
Debt securities, Total Unrealized Losses 2,405 5,766
Debt Securities [Member] | Corporate bank loans [Member]    
Debt Securities, Unrealized Loss Position, Fair Value    
Debt securities, Fair Value 12 months or less 7,682 37,339
Debt securities, Fair Value Longer than 12 months 22,703 36,107
Debt securities, Total Fair Value 30,385 73,446
Debt securities, Unrealized Losses    
Debt securities, Unrealized Losses 12 months or less (34) (678)
Debt securities, Unrealized Losses Longer than 12 months (193) (563)
Debt securities, Total Unrealized Losses 227 1,241
Debt Securities [Member] | Municipal bonds [Member]    
Debt Securities, Unrealized Loss Position, Fair Value    
Debt securities, Fair Value 12 months or less 3,693 10,293
Debt securities, Fair Value Longer than 12 months 6,825 2,275
Debt securities, Total Fair Value 10,518 12,568
Debt securities, Unrealized Losses    
Debt securities, Unrealized Losses 12 months or less (21) (383)
Debt securities, Unrealized Losses Longer than 12 months (557) (40)
Debt securities, Total Unrealized Losses 578 423
Debt Securities [Member] | Mortgage-backed [Member]    
Debt Securities, Unrealized Loss Position, Fair Value    
Debt securities, Fair Value 12 months or less 5 1,348
Debt securities, Fair Value Longer than 12 months 1,179 7
Debt securities, Total Fair Value 1,184 1,355
Debt securities, Unrealized Losses    
Debt securities, Unrealized Losses 12 months or less (1) (136)
Debt securities, Unrealized Losses Longer than 12 months (222) (6)
Debt securities, Total Unrealized Losses 223 142
Equity Securities [Member]    
Equity Securities, Unrealized Loss Position, Fair Value    
Equity securities, Fair Value 12 months or less 888 8,118
Equity securities, Fair Value Longer than 12 months 5,255 3,211
Equity securities, Total Fair Value 6,143 11,329
Equity Securities, Unrealized Loss    
Equity securities, Unrealized Losses 12 months or less (65) (3,835)
Equity securities, Unrealized Losses Longer than 12 months (4,991) (2,005)
Equity securities, Total Unrealized Losses $ (5,056) $ (5,840)