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Summary Of Significant Accounting Policies (Schedule Of Uncollectible Reinsurance Recoverable And Premium Receivables) (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019
Summary Of Significant Accounting Policies [Abstract] |  |
Reinsurance receivables and premium receivables | $ 41,357 | $ 25,605

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