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Investments (Summary of Gross Unrealized Gain (Loss) on Investments) (Details) - USD ($)
$ in Thousands
Mar. 31, 2020
Dec. 31, 2019
Investments, Unrealized Loss Position, Fair Value    
Investments, Fair Value 12 months or less $ 355,942 $ 53,693
Investments, Fair Value Longer than 12 months 10,527 27,333
Investments, Total Fair Value 366,469 81,026
Investments, Unrealized Losses    
Investments, Unrealized Losses 12 months or less (13,953) (2,678)
Investments, Unrealized Losses Longer than 12 months (8,036) (7,525)
Investments, Total Unrealized Losses (21,989) (10,203)
Debt Securities [Member]    
Debt Securities, Unrealized Loss Position, Fair Value    
Debt securities, Fair Value 12 months or less 345,018 42,788
Debt securities, Fair Value Longer than 12 months 9,199 19,071
Debt securities, Total Fair Value 354,217 61,859
Debt securities, Unrealized Losses    
Debt securities, Unrealized Losses 12 months or less (9,745) (315)
Debt securities, Unrealized Losses Longer than 12 months (1,216) (586)
Debt securities, Total Unrealized Losses 10,961 901
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 110,938  
Debt securities, Fair Value Longer than 12 months   5,513
Debt securities, Total Fair Value 110,938 5,513
Debt securities, Unrealized Losses    
Debt securities, Unrealized Losses 12 months or less (27)  
Debt securities, Unrealized Losses Longer than 12 months   (3)
Debt securities, Total Unrealized Losses 27 3
Debt Securities [Member] | Corporate Bonds [Member]    
Debt Securities, Unrealized Loss Position, Fair Value    
Debt securities, Fair Value 12 months or less 174,415 27,268
Debt securities, Fair Value Longer than 12 months 1,331 1,150
Debt securities, Total Fair Value 175,746 28,418
Debt securities, Unrealized Losses    
Debt securities, Unrealized Losses 12 months or less (4,927) (144)
Debt securities, Unrealized Losses Longer than 12 months (22) (19)
Debt securities, Total Unrealized Losses 4,949 163
Debt Securities [Member] | Collateralized Corporate Bank Loans [Member]    
Debt Securities, Unrealized Loss Position, Fair Value    
Debt securities, Fair Value 12 months or less 51,030 9,000
Debt securities, Fair Value Longer than 12 months 6,133 10,228
Debt securities, Total Fair Value 57,163 19,228
Debt securities, Unrealized Losses    
Debt securities, Unrealized Losses 12 months or less (4,664) (41)
Debt securities, Unrealized Losses Longer than 12 months (1,165) (427)
Debt securities, Total Unrealized Losses 5,829 468
Debt Securities [Member] | Municipal Bonds [Member]    
Debt Securities, Unrealized Loss Position, Fair Value    
Debt securities, Fair Value 12 months or less 6,178 4,808
Debt securities, Fair Value Longer than 12 months 1,721 1,618
Debt securities, Total Fair Value 7,899 6,426
Debt securities, Unrealized Losses    
Debt securities, Unrealized Losses 12 months or less (44) (29)
Debt securities, Unrealized Losses Longer than 12 months (23) (19)
Debt securities, Total Unrealized Losses 67 48
Debt Securities [Member] | Mortgage Backed [Member]    
Debt Securities, Unrealized Loss Position, Fair Value    
Debt securities, Fair Value 12 months or less 2,457 1,712
Debt securities, Fair Value Longer than 12 months 14 562
Debt securities, Total Fair Value 2,471 2,274
Debt securities, Unrealized Losses    
Debt securities, Unrealized Losses 12 months or less (83) (101)
Debt securities, Unrealized Losses Longer than 12 months (6) (118)
Debt securities, Total Unrealized Losses 89 219
Equity Securities [Member]    
Equity Securities, Unrealized Loss Position, Fair Value    
Equity securities, Fair Value 12 months or less 10,924 10,905
Equity securities, Fair Value Longer than 12 months 1,160 6,093
Equity securities, Total Fair Value 12,084 16,998
Equity Securities, Unrealized Loss    
Equity securities, Unrealized Losses 12 months or less (4,208) (2,363)
Equity securities, Unrealized Losses Longer than 12 months (3,225) (5,345)
Equity securities, Total Unrealized Losses (7,433) (7,708)
Other Investments [Member]    
Equity Securities, Unrealized Loss Position, Fair Value    
Equity securities, Fair Value Longer than 12 months 168 2,169
Equity securities, Total Fair Value 168 2,169
Equity Securities, Unrealized Loss    
Equity securities, Unrealized Losses Longer than 12 months (3,595) (1,594)
Equity securities, Total Unrealized Losses $ (3,595) $ (1,594)