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Investments (Summary of Gross Unrealized Gain (Loss) on Investments) (Details) - USD ($)
$ in Thousands
Jun. 30, 2019
Dec. 31, 2018
Investments, Unrealized Loss Position, Fair Value    
Investments, Fair Value 12 months or less $ 126,343 $ 309,764
Investments, Fair Value Longer than 12 months 93,518 169,544
Investments, Total Fair Value 219,861 479,308
Investments, Unrealized Losses    
Investments, Unrealized Losses 12 months or less (2,674) (12,496)
Investments, Unrealized Losses Longer than 12 months (5,565) (7,289)
Investments, Total Unrealized Losses (8,239) (19,785)
Debt Securities [Member]    
Debt Securities, Unrealized Loss Position, Fair Value    
Debt securities, Fair Value 12 months or less 118,363 277,635
Debt securities, Fair Value Longer than 12 months 86,437 165,069
Debt securities, Total Fair Value 204,800 442,704
Debt securities, Unrealized Losses    
Debt securities, Unrealized Losses 12 months or less (1,076) (6,182)
Debt securities, Unrealized Losses Longer than 12 months (631) (2,482)
Debt securities, Total Unrealized Losses 1,707 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 23,216 28,201
Debt securities, Total Fair Value 23,216 47,103
Debt securities, Unrealized Losses    
Debt securities, Unrealized Losses 12 months or less   (181)
Debt securities, Unrealized Losses Longer than 12 months (59) (327)
Debt securities, Total Unrealized Losses 59 508
Debt Securities [Member] | Corporate Bonds [Member]    
Debt Securities, Unrealized Loss Position, Fair Value    
Debt securities, Fair Value 12 months or less 18,143 117,450
Debt securities, Fair Value Longer than 12 months 36,011 100,060
Debt securities, Total Fair Value 54,154 217,510
Debt securities, Unrealized Losses    
Debt securities, Unrealized Losses 12 months or less (144) (907)
Debt securities, Unrealized Losses Longer than 12 months (96) (695)
Debt securities, Total Unrealized Losses 240 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 85,804 120,410
Debt securities, Fair Value Longer than 12 months 17,564 4,931
Debt securities, Total Fair Value 103,368 125,341
Debt securities, Unrealized Losses    
Debt securities, Unrealized Losses 12 months or less (871) (4,938)
Debt securities, Unrealized Losses Longer than 12 months (350) (332)
Debt securities, Total Unrealized Losses 1,221 5,270
Debt Securities [Member] | Municipal Bonds [Member]    
Debt Securities, Unrealized Loss Position, Fair Value    
Debt securities, Fair Value 12 months or less 10,898 14,281
Debt securities, Fair Value Longer than 12 months 5,735 25,891
Debt securities, Total Fair Value 16,633 40,172
Debt securities, Unrealized Losses    
Debt securities, Unrealized Losses 12 months or less (55) (96)
Debt securities, Unrealized Losses Longer than 12 months (38) (742)
Debt securities, Total Unrealized Losses 93 838
Debt Securities [Member] | Mortgage Backed [Member]    
Debt Securities, Unrealized Loss Position, Fair Value    
Debt securities, Fair Value 12 months or less 3,518 6,592
Debt securities, Fair Value Longer than 12 months 3,911 5,986
Debt securities, Total Fair Value 7,429 12,578
Debt securities, Unrealized Losses    
Debt securities, Unrealized Losses 12 months or less (6) (60)
Debt securities, Unrealized Losses Longer than 12 months (88) (386)
Debt securities, Total Unrealized Losses 94 446
Equity Securities [Member]    
Equity Securities, Unrealized Loss Position, Fair Value    
Equity securities, Fair Value 12 months or less 7,952 30,981
Equity securities, Fair Value Longer than 12 months 4,524 4,475
Equity securities, Total Fair Value 12,476 35,456
Equity Securities, Unrealized Loss    
Equity securities, Unrealized Losses 12 months or less (1,588) (3,699)
Equity securities, Unrealized Losses Longer than 12 months (3,766) (4,807)
Equity securities, Total Unrealized Losses (5,354) (8,506)
Other Investments [Member]    
Equity Securities, Unrealized Loss Position, Fair Value    
Equity securities, Fair Value 12 months or less 28 1,148
Equity securities, Fair Value Longer than 12 months 2,557  
Equity securities, Total Fair Value 2,585 1,148
Equity Securities, Unrealized Loss    
Equity securities, Unrealized Losses 12 months or less (10)  
Equity securities, Unrealized Losses Longer than 12 months (1,168) (2,615)
Equity securities, Total Unrealized Losses $ (1,178) $ (2,615)