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Investments (Amortized Cost and Estimated Fair Value of Investments in Debt and Equity Securities by Category) (Details) - USD ($)
$ in Thousands
Sep. 30, 2020
Dec. 31, 2019
Debt Securities, Available-for-sale, Fair Value to Amortized Cost [Abstract]    
Amortized Cost $ 414,197 $ 569,498
Fair Value 417,569 574,279
Equity Securities, Available-for-sale, Fair Value to Amortized Cost [Abstract]    
Equity securities, Amortized Cost 25,735 71,895
Total equity securities 23,372 99,215
Investments, Available-for-sale, Fair Value to Amortized Cost [Abstract]    
Investments, Amortized cost 443,695 645,156
Investments, Gross Unrealized Gains 9,925 40,710
Investments, Gross Unrealized Losses (12,645) (10,203)
Investments, Fair value 440,975 675,663
Mortgage Backed [Member]    
Debt Securities, Available-for-sale, Fair Value to Amortized Cost [Abstract]    
Amortized Cost 6,000  
Fair Value 6,117  
Debt Securities [Member]    
Debt Securities, Available-for-sale, Fair Value to Amortized Cost [Abstract]    
Amortized Cost 414,197 569,498
Gross Unrealized Gain 6,936 5,682
Gross Unrealized Loss (3,564) (901)
Fair Value 417,569 574,279
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 60,332 66,441
Gross Unrealized Gain 671 162
Gross Unrealized Loss (2) (3)
Fair Value 61,001 66,600
Debt Securities [Member] | Corporate Bonds [Member]    
Debt Securities, Available-for-sale, Fair Value to Amortized Cost [Abstract]    
Amortized Cost 235,469 297,601
Gross Unrealized Gain 5,291 3,387
Gross Unrealized Loss (1,281) (163)
Fair Value 239,479 300,825
Debt Securities [Member] | Collateralized Corporate Bank Loans [Member]    
Debt Securities, Available-for-sale, Fair Value to Amortized Cost [Abstract]    
Amortized Cost 57,559 115,669
Gross Unrealized Gain   556
Gross Unrealized Loss (2,225) (468)
Fair Value 55,334 115,757
Debt Securities [Member] | Municipal Bonds [Member]    
Debt Securities, Available-for-sale, Fair Value to Amortized Cost [Abstract]    
Amortized Cost 54,837 81,787
Gross Unrealized Gain 852 1,531
Gross Unrealized Loss (51) (48)
Fair Value 55,638 83,270
Debt Securities [Member] | Mortgage Backed [Member]    
Debt Securities, Available-for-sale, Fair Value to Amortized Cost [Abstract]    
Amortized Cost 6,000 8,000
Gross Unrealized Gain 122 46
Gross Unrealized Loss (5) (219)
Fair Value 6,117 7,827
Equity Securities [Member]    
Equity Securities, Available-for-sale, Fair Value to Amortized Cost [Abstract]    
Equity securities, Amortized Cost 25,735 71,895
Equity Securities, Gross Unrealized Gains 2,989 35,028
Equity Securities, Gross Unrealized Losses (5,352) (7,708)
Total equity securities 23,372 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 (3,729) (1,594)
Total equity securities $ 34 $ 2,169