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Investments (Summary of Gross Unrealized Gain (Loss) on Investments) (Details) - USD ($)
$ in Thousands
Jun. 30, 2022
Dec. 31, 2021
Investments, Unrealized Loss Position, Fair Value    
Investments, Fair Value 12 months or less $ 368,150 $ 95,071
Investments, Fair Value Longer than 12 months 41,480 25,111
Investments, Total Fair Value 409,630 120,182
Investments, Unrealized Losses    
Investments, Unrealized Losses 12 months or less (7,922) (1,115)
Investments, Unrealized Losses Longer than 12 months (5,205) (2,423)
Investments, Total Unrealized Losses (13,127) (3,538)
Debt Securities [Member]    
Debt Securities, Unrealized Loss Position, Fair Value    
Debt securities, Fair Value 12 months or less 353,830 88,850
Debt securities, Fair Value Longer than 12 months 35,746 20,056
Debt securities, Total Fair Value 389,576 108,906
Debt securities, Unrealized Losses    
Debt securities, Unrealized Losses 12 months or less (6,487) (405)
Debt securities, Unrealized Losses Longer than 12 months (1,754) (353)
Debt securities, Total Unrealized Losses 8,241 758
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 41,246 43,273
Debt securities, Fair Value Longer than 12 months 0 0
Debt securities, Total Fair Value 41,246 43,273
Debt securities, Unrealized Losses    
Debt securities, Unrealized Losses 12 months or less (869) (170)
Debt securities, Unrealized Losses Longer than 12 months 0 0
Debt securities, Total Unrealized Losses 869 170
Debt Securities [Member] | Corporate Bonds [Member]    
Debt Securities, Unrealized Loss Position, Fair Value    
Debt securities, Fair Value 12 months or less 260,529 0
Debt securities, Fair Value Longer than 12 months 292 2,245
Debt securities, Total Fair Value 260,821 2,245
Debt securities, Unrealized Losses    
Debt securities, Unrealized Losses 12 months or less (3,606) 0
Debt securities, Unrealized Losses Longer than 12 months (7) (49)
Debt securities, Total Unrealized Losses 3,613 49
Debt Securities [Member] | Corporate bank loans [Member]    
Debt Securities, Unrealized Loss Position, Fair Value    
Debt securities, Fair Value 12 months or less 40,291 42,256
Debt securities, Fair Value Longer than 12 months 34,040 16,763
Debt securities, Total Fair Value 74,331 59,019
Debt securities, Unrealized Losses    
Debt securities, Unrealized Losses 12 months or less (1,655) (177)
Debt securities, Unrealized Losses Longer than 12 months (1,722) (288)
Debt securities, Total Unrealized Losses 3,377 465
Debt Securities [Member] | Municipal Bonds [Member]    
Debt Securities, Unrealized Loss Position, Fair Value    
Debt securities, Fair Value 12 months or less 10,230 3,321
Debt securities, Fair Value Longer than 12 months 1,406 1,038
Debt securities, Total Fair Value 11,636 4,359
Debt securities, Unrealized Losses    
Debt securities, Unrealized Losses 12 months or less (301) (58)
Debt securities, Unrealized Losses Longer than 12 months (20) (12)
Debt securities, Total Unrealized Losses 321 70
Debt Securities [Member] | Collateralized Mortgage Backed Securities [Member]    
Debt Securities, Unrealized Loss Position, Fair Value    
Debt securities, Fair Value 12 months or less 1,534 0
Debt securities, Fair Value Longer than 12 months 8 10
Debt securities, Total Fair Value 1,542 10
Debt securities, Unrealized Losses    
Debt securities, Unrealized Losses 12 months or less (56) 0
Debt securities, Unrealized Losses Longer than 12 months (5) (4)
Debt securities, Total Unrealized Losses 61 4
Equity Securities [Member]    
Equity Securities, Unrealized Loss Position, Fair Value    
Equity securities, Fair Value 12 months or less 14,320 6,221
Equity securities, Fair Value Longer than 12 months 5,734 5,055
Equity securities, Total Fair Value 20,054 11,276
Equity Securities, Unrealized Loss    
Equity securities, Unrealized Losses 12 months or less (1,435) (710)
Equity securities, Unrealized Losses Longer than 12 months (3,451) (2,070)
Equity securities, Total Unrealized Losses $ (4,886) $ (2,780)