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Collateralized Reinsurance And Trust Agreements (Premiums And Losses Ceded By The Company To Affiliate) (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Effects of Reinsurance [Line Items] |  |  |
Ceded written premiums | $ 1,604,251 | $ 1,365,378 | $ 1,308,940
Assumed written premiums | 9,061,881 | 7,264,362 | 6,350,328
Mt. Logan Re Segregated Accounts [Member] |  |  |
Effects of Reinsurance [Line Items] |  |  |
Ceded written premiums | 341,460 | 303,178 | 291,979
Ceded earned premiums | 332,989 | 306,184 | 294,762
Ceded losses and LAE | 282,233 | 241,347 | 187,192
Assumed written premiums | 12,120 | 18,831 | 17,005
Assumed earned premiums | $ 12,120 | $ 18,831 | $ 17,005

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