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Investments (Summary of Gross Unrealized Gain (Loss) on Investments) (Details) - USD ($)
$ in Thousands
Mar. 31, 2023
Dec. 31, 2022
Investments, Unrealized Loss Position, Fair Value    
Investments, Fair Value 12 months or less $ 126,958 $ 307,363
Investments, Fair Value Longer than 12 months 184,844 79,321
Investments, Total Fair Value 311,802 386,684
Investments, Unrealized Losses    
Investments, Unrealized Losses 12 months or less (2,867) (10,863)
Investments, Unrealized Losses Longer than 12 months (7,165) (3,196)
Investments, Total Unrealized Losses (10,032) (14,059)
Debt Securities [Member]    
Debt Securities, Unrealized Loss Position, Fair Value    
Debt securities, Fair Value 12 months or less 121,582 299,245
Debt securities, Fair Value Longer than 12 months 181,116 76,110
Debt securities, Total Fair Value 302,698 375,355
Debt securities, Unrealized Losses    
Debt securities, Unrealized Losses 12 months or less (1,806) (7,028)
Debt securities, Unrealized Losses Longer than 12 months (3,578) (1,191)
Debt securities, Total Unrealized Losses 5,384 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 15,545 17,543
Debt securities, Fair Value Longer than 12 months 24,728 37,622
Debt securities, Total Fair Value 40,273 55,165
Debt securities, Unrealized Losses    
Debt securities, Unrealized Losses 12 months or less (18) (67)
Debt securities, Unrealized Losses Longer than 12 months (265) (580)
Debt securities, Total Unrealized Losses 283 647
Debt Securities [Member] | Corporate bonds [Member]    
Debt Securities, Unrealized Loss Position, Fair Value    
Debt securities, Fair Value 12 months or less 84,381 232,722
Debt securities, Fair Value Longer than 12 months 110,682 99
Debt securities, Total Fair Value 195,063 232,821
Debt securities, Unrealized Losses    
Debt securities, Unrealized Losses 12 months or less (1,618) (5,764)
Debt securities, Unrealized Losses Longer than 12 months (2,455) (2)
Debt securities, Total Unrealized Losses 4,073 5,766
Debt Securities [Member] | Corporate bank loans [Member]    
Debt Securities, Unrealized Loss Position, Fair Value    
Debt securities, Fair Value 12 months or less 17,061 37,339
Debt securities, Fair Value Longer than 12 months 38,331 36,107
Debt securities, Total Fair Value 55,392 73,446
Debt securities, Unrealized Losses    
Debt securities, Unrealized Losses 12 months or less (75) (678)
Debt securities, Unrealized Losses Longer than 12 months (501) (563)
Debt securities, Total Unrealized Losses 576 1,241
Debt Securities [Member] | Municipal bonds [Member]    
Debt Securities, Unrealized Loss Position, Fair Value    
Debt securities, Fair Value 12 months or less 4,554 10,293
Debt securities, Fair Value Longer than 12 months 6,097 2,275
Debt securities, Total Fair Value 10,651 12,568
Debt securities, Unrealized Losses    
Debt securities, Unrealized Losses 12 months or less (94) (383)
Debt securities, Unrealized Losses Longer than 12 months (206) (40)
Debt securities, Total Unrealized Losses 300 423
Debt Securities [Member] | Mortgage-backed [Member]    
Debt Securities, Unrealized Loss Position, Fair Value    
Debt securities, Fair Value 12 months or less 41 1,348
Debt securities, Fair Value Longer than 12 months 1,278 7
Debt securities, Total Fair Value 1,319 1,355
Debt securities, Unrealized Losses    
Debt securities, Unrealized Losses 12 months or less (1) (136)
Debt securities, Unrealized Losses Longer than 12 months (151) (6)
Debt securities, Total Unrealized Losses 152 142
Equity Securities [Member]    
Equity Securities, Unrealized Loss Position, Fair Value    
Equity securities, Fair Value 12 months or less 5,376 8,118
Equity securities, Fair Value Longer than 12 months 3,728 3,211
Equity securities, Total Fair Value 9,104 11,329
Equity Securities, Unrealized Loss    
Equity securities, Unrealized Losses 12 months or less (1,061) (3,835)
Equity securities, Unrealized Losses Longer than 12 months (3,587) (2,005)
Equity securities, Total Unrealized Losses $ (4,648) $ (5,840)