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Investments (Summary of Gross Unrealized Gain (Loss) on Investments) (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Investments, Unrealized Loss Position, Fair Value    
Investments, Fair Value 12 months or less $ 53,693 $ 309,764
Investments, Fair Value Longer than 12 months 27,333 169,544
Investments, Total Fair Value 81,026 479,308
Investments, Unrealized Losses    
Investments, Unrealized Losses 12 months or less (2,678) (12,496)
Investments, Unrealized Losses Longer than 12 months (7,525) (7,289)
Investments, Total Unrealized Losses (10,203) (19,785)
Other Investments [Member]    
Equity Securities, Unrealized Loss Position, Fair Value    
Equity securities, Fair Value 12 months or less   1,148
Equity securities, Fair Value Longer than 12 months 2,169  
Equity securities, Total Fair Value 2,169 1,148
Equity Securities, Unrealized Loss    
Equity securities, Unrealized Losses 12 months or less   (2,615)
Equity securities, Unrealized Losses Longer than 12 months (1,594)  
Equity securities, Total Unrealized Losses (1,594) (2,615)
Debt Securities [Member]    
Debt Securities, Unrealized Loss Position, Fair Value    
Debt securities, Fair Value 12 months or less 42,788 277,635
Debt securities, Fair Value Longer than 12 months 19,071 165,069
Debt securities, Total Fair Value 61,859 442,704
Debt securities, Unrealized Losses    
Debt securities, Unrealized Losses 12 months or less (315) (6,182)
Debt securities, Unrealized Losses Longer than 12 months (586) (2,482)
Debt securities, Total Unrealized Losses 901 8,664
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   18,902
Debt securities, Fair Value Longer than 12 months 5,513 28,201
Debt securities, Total Fair Value 5,513 47,103
Debt securities, Unrealized Losses    
Debt securities, Unrealized Losses 12 months or less   (181)
Debt securities, Unrealized Losses Longer than 12 months (3) (327)
Debt securities, Total Unrealized Losses 3 508
Debt Securities [Member] | Corporate Bonds [Member]    
Debt Securities, Unrealized Loss Position, Fair Value    
Debt securities, Fair Value 12 months or less 27,268 117,450
Debt securities, Fair Value Longer than 12 months 1,150 100,060
Debt securities, Total Fair Value 28,418 217,510
Debt securities, Unrealized Losses    
Debt securities, Unrealized Losses 12 months or less (144) (907)
Debt securities, Unrealized Losses Longer than 12 months (19) (695)
Debt securities, Total Unrealized Losses 163 1,602
Debt Securities [Member] | Collateralized Corporate Bank Loans [Member]    
Debt Securities, Unrealized Loss Position, Fair Value    
Debt securities, Fair Value 12 months or less 9,000 120,410
Debt securities, Fair Value Longer than 12 months 10,228 4,931
Debt securities, Total Fair Value 19,228 125,341
Debt securities, Unrealized Losses    
Debt securities, Unrealized Losses 12 months or less (41) (4,938)
Debt securities, Unrealized Losses Longer than 12 months (427) (332)
Debt securities, Total Unrealized Losses 468 5,270
Debt Securities [Member] | Municipal Bonds [Member]    
Debt Securities, Unrealized Loss Position, Fair Value    
Debt securities, Fair Value 12 months or less 4,808 14,281
Debt securities, Fair Value Longer than 12 months 1,618 25,891
Debt securities, Total Fair Value 6,426 40,172
Debt securities, Unrealized Losses    
Debt securities, Unrealized Losses 12 months or less (29) (96)
Debt securities, Unrealized Losses Longer than 12 months (19) (742)
Debt securities, Total Unrealized Losses 48 838
Debt Securities [Member] | Mortgage Backed [Member]    
Debt Securities, Unrealized Loss Position, Fair Value    
Debt securities, Fair Value 12 months or less 1,712 6,592
Debt securities, Fair Value Longer than 12 months 562 5,986
Debt securities, Total Fair Value 2,274 12,578
Debt securities, Unrealized Losses    
Debt securities, Unrealized Losses 12 months or less (101) (60)
Debt securities, Unrealized Losses Longer than 12 months (118) (386)
Debt securities, Total Unrealized Losses 219 446
Equity Securities [Member]    
Equity Securities, Unrealized Loss Position, Fair Value    
Equity securities, Fair Value 12 months or less 10,905 30,981
Equity securities, Fair Value Longer than 12 months 6,093 4,475
Equity securities, Total Fair Value 16,998 35,456
Equity Securities, Unrealized Loss    
Equity securities, Unrealized Losses 12 months or less (2,363) (3,699)
Equity securities, Unrealized Losses Longer than 12 months (5,345) (4,807)
Equity securities, Total Unrealized Losses $ (7,708) $ (8,506)