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Commitments And Contingencies (Summary Of Estimated Cost To Replace Annuities For Contingent Liability) (Details) - USD ($) $ in Thousands | Mar. 31, 2019 | Dec. 31, 2018
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The Prudential [Member] |  |
Loss Contingencies [Line Items] |  |
Estimated cost to replace annuities | $ 142,458 | $ 142,754
Unaffiliated Life Insurance Company [Member] |  |
Loss Contingencies [Line Items] |  |
Estimated cost to replace annuities | $ 33,059 | $ 34,717

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