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Segment Reporting (Schedule Of Gross Written Premiums Derived From Largest Non-U.S. Market) (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
United Kingdom [Member]        
Segment Reporting Information [Line Items]        
Gross written premium $ 312,343 $ 249,314 $ 623,924 $ 615,462