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Investments (Summary of Gross Unrealized Gain (Loss) on Investments) (Details) - USD ($)
$ in Thousands
Mar. 31, 2022
Dec. 31, 2021
Investments, Unrealized Loss Position, Fair Value    
Investments, Fair Value 12 months or less $ 244,223 $ 95,071
Investments, Fair Value Longer than 12 months 34,376 25,111
Investments, Total Fair Value 278,599 120,182
Investments, Unrealized Losses    
Investments, Unrealized Losses 12 months or less (3,859) (1,115)
Investments, Unrealized Losses Longer than 12 months (2,441) (2,423)
Investments, Total Unrealized Losses (6,300) (3,538)
Debt Securities [Member]    
Debt Securities, Unrealized Loss Position, Fair Value    
Debt securities, Fair Value 12 months or less 230,058 88,850
Debt securities, Fair Value Longer than 12 months 30,454 20,056
Debt securities, Total Fair Value 260,512 108,906
Debt securities, Unrealized Losses    
Debt securities, Unrealized Losses 12 months or less (2,375) (405)
Debt securities, Unrealized Losses Longer than 12 months (571) (353)
Debt securities, Total Unrealized Losses 2,946 758
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 42,483 43,273
Debt securities, Fair Value Longer than 12 months 0 0
Debt securities, Total Fair Value 42,483 43,273
Debt securities, Unrealized Losses    
Debt securities, Unrealized Losses 12 months or less (692) (170)
Debt securities, Unrealized Losses Longer than 12 months 0 0
Debt securities, Total Unrealized Losses 692 170
Debt Securities [Member] | Corporate Bonds [Member]    
Debt Securities, Unrealized Loss Position, Fair Value    
Debt securities, Fair Value 12 months or less 130,766 0
Debt securities, Fair Value Longer than 12 months 1,149 2,245
Debt securities, Total Fair Value 131,915 2,245
Debt securities, Unrealized Losses    
Debt securities, Unrealized Losses 12 months or less (1,089) 0
Debt securities, Unrealized Losses Longer than 12 months (20) (49)
Debt securities, Total Unrealized Losses 1,109 49
Debt Securities [Member] | Corporate bank loans [Member]    
Debt Securities, Unrealized Loss Position, Fair Value    
Debt securities, Fair Value 12 months or less 45,991 42,256
Debt securities, Fair Value Longer than 12 months 28,458 16,763
Debt securities, Total Fair Value 74,449 59,019
Debt securities, Unrealized Losses    
Debt securities, Unrealized Losses 12 months or less (480) (177)
Debt securities, Unrealized Losses Longer than 12 months (535) (288)
Debt securities, Total Unrealized Losses 1,015 465
Debt Securities [Member] | Municipal Bonds [Member]    
Debt Securities, Unrealized Loss Position, Fair Value    
Debt securities, Fair Value 12 months or less 9,149 3,321
Debt securities, Fair Value Longer than 12 months 838 1,038
Debt securities, Total Fair Value 9,987 4,359
Debt securities, Unrealized Losses    
Debt securities, Unrealized Losses 12 months or less (106) (58)
Debt securities, Unrealized Losses Longer than 12 months (11) (12)
Debt securities, Total Unrealized Losses 117 70
Debt Securities [Member] | Collateralized Mortgage Backed Securities [Member]    
Debt Securities, Unrealized Loss Position, Fair Value    
Debt securities, Fair Value 12 months or less 1,669 0
Debt securities, Fair Value Longer than 12 months 9 10
Debt securities, Total Fair Value 1,678 10
Debt securities, Unrealized Losses    
Debt securities, Unrealized Losses 12 months or less (8) 0
Debt securities, Unrealized Losses Longer than 12 months (5) (4)
Debt securities, Total Unrealized Losses 13 4
Equity Securities [Member]    
Equity Securities, Unrealized Loss Position, Fair Value    
Equity securities, Fair Value 12 months or less 14,165 6,221
Equity securities, Fair Value Longer than 12 months 3,922 5,055
Equity securities, Total Fair Value 18,087 11,276
Equity Securities, Unrealized Loss    
Equity securities, Unrealized Losses 12 months or less (1,484) (710)
Equity securities, Unrealized Losses Longer than 12 months (1,870) (2,070)
Equity securities, Total Unrealized Losses $ (3,354) $ (2,780)