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Investments - Schedule of Maturities of Fixed Maturity Securities Available-for-Sale (Details) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Amortized Cost    
Total $ 1,258,419  
Fair Value    
Total 1,278,958 $ 1,231,841
Corporate, Municipal, U.S. Government and Other securities    
Amortized Cost    
Due in one year or less 48,194  
Due after one year through five years 113,158  
Due after five years through ten years 137,763  
Due after ten years 698,160  
Subtotal 997,275  
Fair Value    
Due in one year or less 44,237  
Due after one year through five years 113,987  
Due after five years through ten years 139,539  
Due after ten years 716,281  
Subtotal 1,014,044  
Mortgage-backed securities    
Amortized Cost    
Amortized cost, without single maturity date 184,841  
Fair Value    
Fair value, without single maturity date 187,249  
Asset-backed securities    
Amortized Cost    
Amortized cost, without single maturity date 76,303  
Fair Value    
Fair value, without single maturity date $ 77,665