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Commitments And Contingencies (Summary Of Estimated Cost To Replace Annuities For Contingent Liability) (Details) - USD ($) $ in Thousands | Mar. 31, 2021 | Dec. 31, 2020
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The Prudential [Member] |  |
Loss Contingencies [Line Items] |  |
Estimated cost to replace annuities | $ 139,981 | $ 140,773
Unaffiliated Life Insurance Company [Member] |  |
Loss Contingencies [Line Items] |  |
Estimated cost to replace annuities | $ 32,835 | $ 35,128

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