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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

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