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Investments - Schedule of Major Industry Types of Fixed Maturity Holdings (Details) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost $ 1,258,419  
Fair Value $ 1,278,958 $ 1,231,841
Percentage of total 100.00% 100.00%
Fixed maturity securities    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost $ 600,458 $ 553,487
Fair Value $ 617,039 $ 546,268
Percentage of total 100.00% 100.00%
Fixed maturity securities | Finance, insurance, and real estate    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost $ 214,911 $ 223,144
Fair Value $ 211,834 $ 217,377
Percentage of total 34.30% 39.80%
Fixed maturity securities | Transportation, communications, electric, gas and sanitary services    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost $ 180,647 $ 156,022
Fair Value $ 189,163 $ 155,175
Percentage of total 30.70% 28.40%
Fixed maturity securities | Manufacturing    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost $ 112,644 $ 95,138
Fair Value $ 118,440 $ 94,792
Percentage of total 19.20% 17.40%
Fixed maturity securities | Other    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost $ 92,256 $ 79,183
Fair Value $ 97,602 $ 78,924
Percentage of total 15.80% 14.40%