XML 97 R87.htm IDEA: XBRL DOCUMENT v3.19.3
Segment Reporting (Schedule Of Gross Written Premiums Derived From Largest Non-U.S. Market) (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
United Kingdom [Member]        
Segment Reporting Information [Line Items]        
Gross written premiums $ 272,297 $ 246,580 $ 743,294 $ 681,911