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Investments - Net Investment Income (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Schedule of Net Investment Income, Reported Amounts, by Category [Line Items]    
Gross investment income, operating $ 36,482 $ 31,190
Investment expenses (1,284) (2,298)
Investment income net of investment expenses 35,198 28,892
Interest expense on surplus note (15,146) (13,472)
Net investment income 20,052 15,420
Equity Securities [Member]    
Schedule of Net Investment Income, Reported Amounts, by Category [Line Items]    
Gross investment income, operating 391 451
Policy Loans and Other Invested Assets [Member]    
Schedule of Net Investment Income, Reported Amounts, by Category [Line Items]    
Gross investment income, operating 231 189
Cash and Cash Equivalents [Member]    
Schedule of Net Investment Income, Reported Amounts, by Category [Line Items]    
Gross investment income, operating 119 843
Total return on deposit asset underlying 10% insurance agreement [Member]    
Schedule of Net Investment Income, Reported Amounts, by Category [Line Items]    
Gross investment income, operating [1] 575 (4,549)
Available-for-Sale [Member] | Fixed Maturities    
Schedule of Net Investment Income, Reported Amounts, by Category [Line Items]    
Gross investment income, operating 20,020 20,784
Held-to-Maturity [Member] | Fixed Maturities    
Schedule of Net Investment Income, Reported Amounts, by Category [Line Items]    
Gross investment income, operating $ 15,146 $ 13,472
[1] Included $(0.8) million and $(6.4) million of net losses recognized for the change in fair value of the deposit asset underlying the 10% coinsurance agreement for the three months ended March 31, 2021 and 2020, respectively.