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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, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Effects of Reinsurance [Line Items] |  |  |
Ceded written premiums | $ 1,365,378 | $ 1,308,940 | $ 1,060,726
Assumed written premiums | 7,264,362 | 6,350,328 | 6,234,203
Mt. Logan Re Segregated Accounts [Member] |  |  |
Effects of Reinsurance [Line Items] |  |  |
Ceded written premiums | 303,178 | 291,979 | 260,612
Ceded earned premiums | 306,184 | 294,762 | 262,518
Ceded losses and LAE | 241,347 | 187,192 | 319,046
Assumed written premiums | 18,831 | 17,005 | 11,032
Assumed earned premiums | 18,831 | 17,005 | 11,032
Assumed losses and LAE |  |  |

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