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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
Mar. 31, 2019
Mar. 31, 2018
United Kingdom [Member]    
Segment Reporting Information [Line Items]    
Gross written premiums $ 263,857 $ 258,259