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Investments (Amortized Cost and Estimated Fair Value of Investments in Debt and Equity Securities by Category) (Details) - USD ($)
$ in Thousands
Mar. 31, 2020
Dec. 31, 2019
Debt Securities, Available-for-sale, Fair Value to Amortized Cost [Abstract]    
Amortized Cost $ 597,170 $ 569,498
Fair Value 589,383 574,279
Equity Securities, Available-for-sale, Fair Value to Amortized Cost [Abstract]    
Equity securities, Amortized Cost 19,783 71,895
Total equity securities 14,139 99,215
Investments, Available-for-sale, Fair Value to Amortized Cost [Abstract]    
Investments, Amortized cost 620,716 645,156
Investments, Gross Unrealized Gains 4,963 40,710
Investments, Gross Unrealized Losses (21,989) (10,203)
Investments, Fair value 603,690 675,663
Mortgage Backed [Member]    
Debt Securities, Available-for-sale, Fair Value to Amortized Cost [Abstract]    
Amortized Cost 7,565  
Fair Value 7,563  
Debt Securities [Member]    
Debt Securities, Available-for-sale, Fair Value to Amortized Cost [Abstract]    
Amortized Cost 597,170 569,498
Gross Unrealized Gain 3,174 5,682
Gross Unrealized Loss (10,961) (901)
Fair Value 589,383 574,279
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 154,303 66,441
Gross Unrealized Gain 1,011 162
Gross Unrealized Loss (27) (3)
Fair Value 155,287 66,600
Debt Securities [Member] | Corporate Bonds [Member]    
Debt Securities, Available-for-sale, Fair Value to Amortized Cost [Abstract]    
Amortized Cost 302,433 297,601
Gross Unrealized Gain 1,357 3,387
Gross Unrealized Loss (4,949) (163)
Fair Value 298,841 300,825
Debt Securities [Member] | Collateralized Corporate Bank Loans [Member]    
Debt Securities, Available-for-sale, Fair Value to Amortized Cost [Abstract]    
Amortized Cost 62,993 115,669
Gross Unrealized Gain   556
Gross Unrealized Loss (5,829) (468)
Fair Value 57,164 115,757
Debt Securities [Member] | Municipal Bonds [Member]    
Debt Securities, Available-for-sale, Fair Value to Amortized Cost [Abstract]    
Amortized Cost 69,876 81,787
Gross Unrealized Gain 719 1,531
Gross Unrealized Loss (67) (48)
Fair Value 70,528 83,270
Debt Securities [Member] | Mortgage Backed [Member]    
Debt Securities, Available-for-sale, Fair Value to Amortized Cost [Abstract]    
Amortized Cost 7,565 8,000
Gross Unrealized Gain 87 46
Gross Unrealized Loss (89) (219)
Fair Value 7,563 7,827
Equity Securities [Member]    
Equity Securities, Available-for-sale, Fair Value to Amortized Cost [Abstract]    
Equity securities, Amortized Cost 19,783 71,895
Equity Securities, Gross Unrealized Gains 1,789 35,028
Equity Securities, Gross Unrealized Losses (7,433) (7,708)
Total equity securities 14,139 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 Losses (3,595) (1,594)
Total equity securities $ 168 $ 2,169