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Segment Reporting (Schedule Of Gross Written Premium Derived From Largest Non-U.S. Market) (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Canada [Member]        
Segment Reporting Information [Line Items]        
Gross written premiums $ 30,160 $ 36,830 $ 53,672 $ 74,489