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Investments (Amortized Cost and Estimated Fair Value of Investments in Debt and Equity Securities by Category) (Details) - USD ($)
$ in Thousands
Jun. 30, 2020
Dec. 31, 2019
Debt Securities, Available-for-sale, Fair Value to Amortized Cost [Abstract]    
Amortized Cost $ 552,266 $ 569,498
Fair Value 553,322 574,279
Equity Securities, Available-for-sale, Fair Value to Amortized Cost [Abstract]    
Equity securities, Amortized Cost 21,249 71,895
Total equity securities 17,949 99,215
Investments, Available-for-sale, Fair Value to Amortized Cost [Abstract]    
Investments, Amortized cost 577,278 645,156
Investments, Gross Unrealized Gains 9,894 40,710
Investments, Gross Unrealized Losses (15,606) (10,203)
Investments, Fair value 571,566 675,663
Mortgage Backed [Member]    
Debt Securities, Available-for-sale, Fair Value to Amortized Cost [Abstract]    
Amortized Cost 7,124  
Fair Value 7,261  
Debt Securities [Member]    
Debt Securities, Available-for-sale, Fair Value to Amortized Cost [Abstract]    
Amortized Cost 552,266 569,498
Gross Unrealized Gain 7,809 5,682
Gross Unrealized Loss (6,753) (901)
Fair Value 553,322 574,279
Debt Securities [Member] | U.S. Treasury Securities and Obligations of U.S. Government [Member]    
Debt Securities, Available-for-sale, Fair Value to Amortized Cost [Abstract]    
Amortized Cost 154,267 66,441
Gross Unrealized Gain 833 162
Gross Unrealized Loss (35) (3)
Fair Value 155,065 66,600
Debt Securities [Member] | Corporate Bonds [Member]    
Debt Securities, Available-for-sale, Fair Value to Amortized Cost [Abstract]    
Amortized Cost 266,926 297,601
Gross Unrealized Gain 5,992 3,387
Gross Unrealized Loss (3,612) (163)
Fair Value 269,306 300,825
Debt Securities [Member] | Collateralized Corporate Bank Loans [Member]    
Debt Securities, Available-for-sale, Fair Value to Amortized Cost [Abstract]    
Amortized Cost 59,409 115,669
Gross Unrealized Gain   556
Gross Unrealized Loss (3,045) (468)
Fair Value 56,364 115,757
Debt Securities [Member] | Municipal Bonds [Member]    
Debt Securities, Available-for-sale, Fair Value to Amortized Cost [Abstract]    
Amortized Cost 64,540 81,787
Gross Unrealized Gain 843 1,531
Gross Unrealized Loss (57) (48)
Fair Value 65,326 83,270
Debt Securities [Member] | Mortgage Backed [Member]    
Debt Securities, Available-for-sale, Fair Value to Amortized Cost [Abstract]    
Amortized Cost 7,124 8,000
Gross Unrealized Gain 141 46
Gross Unrealized Loss (4) (219)
Fair Value 7,261 7,827
Equity Securities [Member]    
Equity Securities, Available-for-sale, Fair Value to Amortized Cost [Abstract]    
Equity securities, Amortized Cost 21,249 71,895
Equity Securities, Gross Unrealized Gains 2,085 35,028
Equity Securities, Gross Unrealized Losses (5,385) (7,708)
Total equity securities 17,949 99,215
Other Investments [Member]    
Equity Securities, Available-for-sale, Fair Value to Amortized Cost [Abstract]    
Equity securities, Amortized Cost 3,763 3,763
Equity Securities, Gross Unrealized Gains 0 0
Equity Securities, Gross Unrealized Losses (3,468) (1,594)
Total equity securities $ 295 $ 2,169