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Schedule I (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]    
Other investments, cost $ 960,711  
Fixed maturities, available-for-sale (amortized cost of $874,445 and $763,434, respectively) 862,345 $ 762,855
Available-for-sale Securities, Equity Securities 80,978 63,295
Other Long-term Investments 8,513 8,381
Investments 951,836 854,531
Loans and Leases Receivable, Net Amount 0 20,000
US Government and Government Agencies and Authorities    
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]    
Debt Securities, Available-for-sale, Amortized Cost 100,240 93,827
Fixed maturities, available-for-sale (amortized cost of $874,445 and $763,434, respectively) 98,975 92,626
Foreign Government Debt Securities    
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]    
Debt Securities, Available-for-sale, Amortized Cost 3,993 2,022
Fixed maturities, available-for-sale (amortized cost of $874,445 and $763,434, respectively) 3,982 2,036
US States and Political Subdivisions Debt Securities [Member]    
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]    
Debt Securities, Available-for-sale, Amortized Cost 145,415 200,706
Fixed maturities, available-for-sale (amortized cost of $874,445 and $763,434, respectively) 144,468 201,512
Public Utility, Bonds    
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]    
Debt Securities, Available-for-sale, Amortized Cost 24,560 20,215
Fixed maturities, available-for-sale (amortized cost of $874,445 and $763,434, respectively) 23,890 20,257
Asset-backed Securities    
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]    
Debt Securities, Available-for-sale, Amortized Cost 64,071 14,902
Fixed maturities, available-for-sale (amortized cost of $874,445 and $763,434, respectively) 64,037 14,905
All Other Corporate Bonds    
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]    
Debt Securities, Available-for-sale, Amortized Cost 307,875 287,025
Fixed maturities, available-for-sale (amortized cost of $874,445 and $763,434, respectively) 301,988 287,562
Mortgage Backed Securities    
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]    
Debt Securities, Available-for-sale, Amortized Cost 227,004 143,982
Fixed maturities, available-for-sale (amortized cost of $874,445 and $763,434, respectively) 223,854 143,265
Other Assets    
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]    
Fixed maturities, available-for-sale (amortized cost of $874,445 and $763,434, respectively) 223,854  
Redeemable Preferred Stock    
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]    
Debt Securities, Available-for-sale, Amortized Cost 1,287 755
Fixed maturities, available-for-sale (amortized cost of $874,445 and $763,434, respectively) 1,151 692
Fixed Maturities    
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]    
Debt Securities, Available-for-sale, Amortized Cost 874,445  
Fixed Maturities    
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]    
Debt Securities, Available-for-sale, Amortized Cost 874,445 763,434
Fixed maturities, available-for-sale (amortized cost of $874,445 and $763,434, respectively) 862,345 762,855
Mutual Fund    
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]    
Available-for-sale Securities, Equity Securities 50,016  
Cost 50,972  
Fair Value 50,016 31,924
Public Utility, Equities    
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]    
Available-for-sale Securities, Equity Securities 1,759  
Cost 1,636  
Fair Value 1,759 1,702
Common Stock    
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]    
Available-for-sale Securities, Equity Securities 27,198  
Cost 23,272  
Fair Value 27,198 27,902
Nonredeemable Preferred Stock    
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]    
Available-for-sale Securities, Equity Securities 2,005  
Cost 2,098  
Fair Value 2,005 1,767
Equity Securities    
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]    
Available-for-sale Equity Securities, Amortized Cost Basis 77,978  
Available-for-sale Securities, Equity Securities 80,978  
Fair Value 80,978 63,295
Other Long-term Investments    
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]    
Other investments, cost 8,288 $ 8,057
Other Long-term Investments $ 8,513