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Schedule I (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties    
Other investments, cost $ 968,690  
Fixed maturities, available-for-sale (amortized cost of $869,598 and $874,445, respectively) 884,861 $ 862,345
Equity Securities 116,610 80,978
Other Long-term Investments 10,252 8,513
Investments 1,011,723 951,836
US Government and Government Agencies and Authorities    
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties    
Debt Securities, Available-for-sale, Amortized Cost 120,260 100,240
Fixed maturities, available-for-sale (amortized cost of $869,598 and $874,445, respectively) 120,816 98,975
Foreign Government Debt Securities    
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties    
Debt Securities, Available-for-sale, Amortized Cost 3,975 3,993
Fixed maturities, available-for-sale (amortized cost of $869,598 and $874,445, respectively) 4,071 3,982
US States and Political Subdivisions Debt Securities [Member]    
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties    
Debt Securities, Available-for-sale, Amortized Cost 131,203 145,415
Fixed maturities, available-for-sale (amortized cost of $869,598 and $874,445, respectively) 133,751 144,468
Public Utility, Bonds    
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties    
Debt Securities, Available-for-sale, Amortized Cost 24,660 24,560
Fixed maturities, available-for-sale (amortized cost of $869,598 and $874,445, respectively) 25,334 23,890
Asset-backed Securities    
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties    
Debt Securities, Available-for-sale, Amortized Cost 56,487 64,071
Fixed maturities, available-for-sale (amortized cost of $869,598 and $874,445, respectively) 57,129 64,037
All Other Corporate Bonds    
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties    
Debt Securities, Available-for-sale, Amortized Cost 281,892 307,875
Fixed maturities, available-for-sale (amortized cost of $869,598 and $874,445, respectively) 288,872 301,988
Mortgage Backed Securities    
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties    
Debt Securities, Available-for-sale, Amortized Cost 248,206 227,004
Fixed maturities, available-for-sale (amortized cost of $869,598 and $874,445, respectively) 251,903 223,854
Other Assets    
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties    
Fixed maturities, available-for-sale (amortized cost of $869,598 and $874,445, respectively) 251,903  
Redeemable Preferred Stock    
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties    
Debt Securities, Available-for-sale, Amortized Cost 2,915 1,287
Fixed maturities, available-for-sale (amortized cost of $869,598 and $874,445, respectively) 2,985 1,151
Fixed Maturities    
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties    
Debt Securities, Available-for-sale, Amortized Cost 869,598  
Fixed Maturities    
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties    
Debt Securities, Available-for-sale, Amortized Cost 869,598 874,445
Fixed maturities, available-for-sale (amortized cost of $869,598 and $874,445, respectively) 884,861 862,345
Mutual Fund    
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties    
Equity Securities 65,453  
Cost 52,298  
Fair Value 65,453 50,016
Public Utility, Equities    
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties    
Equity Securities 3,663  
Cost 3,098  
Fair Value 3,663 1,759
Common Stock    
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties    
Equity Securities 44,492  
Cost 32,669  
Fair Value 44,492 27,198
Nonredeemable Preferred Stock    
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties    
Equity Securities 3,002  
Cost 2,960  
Fair Value 3,002 2,005
Equity Securities    
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties    
Equity Securities, Amortized Cost Basis 91,025  
Equity Securities 116,610  
Fair Value 116,610 $ 80,978
Other Long-term Investments    
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties    
Other investments, cost 8,067  
Other Long-term Investments $ 10,252