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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, 2019
Dec. 31, 2018
Debt Securities, Available-for-sale, Fair Value to Amortized Cost [Abstract]    
Debt securities, Amortized Cost $ 530,516 $ 550,268
Total debt securities 533,148 545,870
Equity Securities, Available-for-sale, Fair Value to Amortized Cost [Abstract]    
Equity securities, Amortized Cost 68,709 68,709
Total equity securities 94,012 80,896
Investments, Available-for-sale, Fair Value to Amortized Cost [Abstract]    
Investments, Amortized cost 602,988 622,740
Investments, Gross Unrealized Gains 34,996 24,959
Investments, Gross Unrealized Losses (8,239) (19,785)
Investments, Fair value 629,745 627,914
Mortgage Backed [Member]    
Debt Securities, Available-for-sale, Fair Value to Amortized Cost [Abstract]    
Debt securities, Amortized Cost 9,899  
Total debt securities 9,856  
Debt Securities [Member]    
Debt Securities, Available-for-sale, Fair Value to Amortized Cost [Abstract]    
Debt securities, Amortized Cost 530,516 550,268
Debt securities, Gross Unrealized Gain 4,339 4,266
Debt securities, Gross Unrealized Loss (1,707) (8,664)
Total debt securities 533,148 545,870
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]    
Debt securities, Amortized Cost 48,369 48,609
Debt securities, Gross Unrealized Gain 112 5
Debt securities, Gross Unrealized Loss (59) (508)
Total debt securities 48,422 48,106
Debt Securities [Member] | Corporate Bonds [Member]    
Debt Securities, Available-for-sale, Fair Value to Amortized Cost [Abstract]    
Debt securities, Amortized Cost 223,770 243,314
Debt securities, Gross Unrealized Gain 2,813 440
Debt securities, Gross Unrealized Loss (240) (1,602)
Total debt securities 226,343 242,152
Debt Securities [Member] | Collateralized Corporate Bank Loans [Member]    
Debt Securities, Available-for-sale, Fair Value to Amortized Cost [Abstract]    
Debt securities, Amortized Cost 133,840 131,779
Debt securities, Gross Unrealized Gain 59 19
Debt securities, Gross Unrealized Loss (1,221) (5,270)
Total debt securities 132,678 126,528
Debt Securities [Member] | Municipal Bonds [Member]    
Debt Securities, Available-for-sale, Fair Value to Amortized Cost [Abstract]    
Debt securities, Amortized Cost 114,638 112,574
Debt securities, Gross Unrealized Gain 1,304 3,791
Debt securities, Gross Unrealized Loss (93) (838)
Total debt securities 115,849 115,527
Debt Securities [Member] | Mortgage Backed [Member]    
Debt Securities, Available-for-sale, Fair Value to Amortized Cost [Abstract]    
Debt securities, Amortized Cost 9,899 13,992
Debt securities, Gross Unrealized Gain 51 11
Debt securities, Gross Unrealized Loss (94) (446)
Total debt securities 9,856 13,557
Equity Securities [Member]    
Equity Securities, Available-for-sale, Fair Value to Amortized Cost [Abstract]    
Equity securities, Amortized Cost 68,709 68,709
Equity Securities, Gross Unrealized Gains 30,657 20,693
Equity Securities, Gross Unrealized Losses (5,354) (8,506)
Total equity securities 94,012 80,896
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 (1,178) (2,615)
Total equity securities $ 2,585 $ 1,148