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Investments (Summary of Gross Unrealized Gain (Loss) on Investments) (Details) - USD ($)
$ in Thousands
Jun. 30, 2020
Dec. 31, 2019
Investments, Unrealized Loss Position, Fair Value    
Investments, Fair Value 12 months or less $ 187,267 $ 53,693
Investments, Fair Value Longer than 12 months 14,102 27,333
Investments, Total Fair Value 201,369 81,026
Investments, Unrealized Losses    
Investments, Unrealized Losses 12 months or less (9,801) (2,678)
Investments, Unrealized Losses Longer than 12 months (5,805) (7,525)
Investments, Total Unrealized Losses (15,606) (10,203)
Debt Securities [Member]    
Debt Securities, Unrealized Loss Position, Fair Value    
Debt securities, Fair Value 12 months or less 177,245 42,788
Debt securities, Fair Value Longer than 12 months 13,010 19,071
Debt securities, Total Fair Value 190,255 61,859
Debt securities, Unrealized Losses    
Debt securities, Unrealized Losses 12 months or less (5,694) (315)
Debt securities, Unrealized Losses Longer than 12 months (1,059) (586)
Debt securities, Total Unrealized Losses 6,753 901
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 110,942 0
Debt securities, Fair Value Longer than 12 months 0 5,513
Debt securities, Total Fair Value 110,942 5,513
Debt securities, Unrealized Losses    
Debt securities, Unrealized Losses 12 months or less (35) 0
Debt securities, Unrealized Losses Longer than 12 months 0 (3)
Debt securities, Total Unrealized Losses 35 3
Debt Securities [Member] | Corporate Bonds [Member]    
Debt Securities, Unrealized Loss Position, Fair Value    
Debt securities, Fair Value 12 months or less 13,422 27,268
Debt securities, Fair Value Longer than 12 months 5,310 1,150
Debt securities, Total Fair Value 18,732 28,418
Debt securities, Unrealized Losses    
Debt securities, Unrealized Losses 12 months or less (3,230) (144)
Debt securities, Unrealized Losses Longer than 12 months (382) (19)
Debt securities, Total Unrealized Losses 3,612 163
Debt Securities [Member] | Collateralized Corporate Bank Loans [Member]    
Debt Securities, Unrealized Loss Position, Fair Value    
Debt securities, Fair Value 12 months or less 50,701 9,000
Debt securities, Fair Value Longer than 12 months 5,663 10,228
Debt securities, Total Fair Value 56,364 19,228
Debt securities, Unrealized Losses    
Debt securities, Unrealized Losses 12 months or less (2,395) (41)
Debt securities, Unrealized Losses Longer than 12 months (650) (427)
Debt securities, Total Unrealized Losses 3,045 468
Debt Securities [Member] | Municipal Bonds [Member]    
Debt Securities, Unrealized Loss Position, Fair Value    
Debt securities, Fair Value 12 months or less 2,180 4,808
Debt securities, Fair Value Longer than 12 months 2,022 1,618
Debt securities, Total Fair Value 4,202 6,426
Debt securities, Unrealized Losses    
Debt securities, Unrealized Losses 12 months or less (34) (29)
Debt securities, Unrealized Losses Longer than 12 months (23) (19)
Debt securities, Total Unrealized Losses 57 48
Debt Securities [Member] | Mortgage Backed [Member]    
Debt Securities, Unrealized Loss Position, Fair Value    
Debt securities, Fair Value 12 months or less   1,712
Debt securities, Fair Value Longer than 12 months 15 562
Debt securities, Total Fair Value 15 2,274
Debt securities, Unrealized Losses    
Debt securities, Unrealized Losses 12 months or less   (101)
Debt securities, Unrealized Losses Longer than 12 months (4) (118)
Debt securities, Total Unrealized Losses 4 219
Equity Securities [Member]    
Equity Securities, Unrealized Loss Position, Fair Value    
Equity securities, Fair Value 12 months or less 10,022 10,905
Equity securities, Fair Value Longer than 12 months 797 6,093
Equity securities, Total Fair Value 10,819 16,998
Equity Securities, Unrealized Loss    
Equity securities, Unrealized Losses 12 months or less (4,107) (2,363)
Equity securities, Unrealized Losses Longer than 12 months (1,278) (5,345)
Equity securities, Total Unrealized Losses (5,385) (7,708)
Other Investments [Member]    
Equity Securities, Unrealized Loss Position, Fair Value    
Equity securities, Fair Value 12 months or less 0 0
Equity securities, Fair Value Longer than 12 months 295 2,169
Equity securities, Total Fair Value 295 2,169
Equity Securities, Unrealized Loss    
Equity securities, Unrealized Losses 12 months or less 0 0
Equity securities, Unrealized Losses Longer than 12 months (3,468) (1,594)
Equity securities, Total Unrealized Losses $ (3,468) $ (1,594)