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Investments - Net Investment Income (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Investment [Line Items]        
Gross investment income $ 31,885 $ 16,333 $ 69,041 $ 48,681
External investment expense (175) (46) (265) (151)
Net investment income 31,710 16,287 68,776 48,530
Fixed maturity securities, available-for-sale at fair value        
Investment [Line Items]        
Gross investment income 26,687 14,951 58,574 44,426
Equity securities        
Investment [Line Items]        
Gross investment income 1,501 578 2,763 1,827
Mortgage loans        
Investment [Line Items]        
Gross investment income 1,971 447 4,824 1,475
Policy loans        
Investment [Line Items]        
Gross investment income 316 289 873 878
Other invested assets        
Investment [Line Items]        
Gross investment income $ 1,410 $ 68 $ 2,007 $ 75