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Policyholders' Liabilities (Policyholders' Account Balances) (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Liability for Policyholders' Account Balances, by Product Segment [Line Items]    
Total policyholders’ account balances $ 5,353,596 $ 4,846,152
Interest-sensitive life contracts    
Liability for Policyholders' Account Balances, by Product Segment [Line Items]    
Total policyholders’ account balances 15,049 15,301
Individual annuities    
Liability for Policyholders' Account Balances, by Product Segment [Line Items]    
Total policyholders’ account balances 4,729,973 4,162,138
Guaranteed interest accounts    
Liability for Policyholders' Account Balances, by Product Segment [Line Items]    
Total policyholders’ account balances $ 608,574 $ 668,713