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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, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
United Kingdom [Member]        
Segment Reporting Information [Line Items]        
Gross written premiums $ 207,140 $ 177,072 $ 470,997 $ 435,331