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Investments (Fixed Maturity Securities Pledged And Received As Collateral) (Details) - USD ($)
$ in Thousands
9 Months Ended
Sep. 30, 2020
Dec. 31, 2019
Debt Securities, Available-for-sale [Line Items]    
Document Period End Date Sep. 30, 2020  
Collateral Fixed Maturity Securities [Member]    
Debt Securities, Available-for-sale [Line Items]    
Available-for-sale Securities, Amortized Cost Basis $ 132,000 $ 113,000
Available-for-sale Securities 143,000 116,000
Collateral Received Fixed Maturity Securities [Member]    
Debt Securities, Available-for-sale [Line Items]    
Available-for-sale Securities 1,421 727,000
Reported Value Measurement [Member]    
Debt Securities, Available-for-sale [Line Items]    
Assets Held-in-trust 27,702,000 27,290,000
Estimate of Fair Value Measurement [Member]    
Debt Securities, Available-for-sale [Line Items]    
Assets Held-in-trust $ 30,432,000 $ 29,239,000