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Segment Reporting (Tables)	9 Months Ended
Segment Reporting (Tables)	Sep. 30, 2020
Segment Reporting [Abstract]
Schedule Of Underwriting Results For Operating Segments	Three Months Ended Nine Months Ended Reinsurance September 30, September 30, (Dollars in thousands) 2020 2019 2020 2019 Gross written premiums $ 2,086,961 $ 1,736,672 $ 5,403,080 $ 4,678,310 Net written premiums 1,936,851 1,583,713 4,974,034 4,212,952 Premiums earned $ 1,669,257 $ 1,420,799 $ 4,656,733 $ 4,072,078 Incurred losses and LAE 1,335,048 1,050,621 3,361,367 2,605,901 Commission and brokerage 373,251 371,098 1,130,946 1,039,113 Other underwriting expenses 51,333 43,832 135,170 117,031 Underwriting gain (loss) $ (90,375) $ (44,752) $ 29,250 $ 310,033 Three Months Ended Nine Months Ended Insurance September 30, September 30, (Dollars in thousands) 2020 2019 2020 2019 Gross written premiums $ 704,643 $ 666,602 $ 2,328,733 $ 2,018,727 Net written premiums 511,829 484,844 1,693,603 1,491,286 Premiums earned $ 536,554 $ 484,820 $ 1,628,297 $ 1,383,537 Incurred losses and LAE 401,162 321,303 1,212,699 909,203 Commission and brokerage 72,081 71,978 229,224 214,387 Other underwriting expenses 87,542 74,326 250,695 204,945 Underwriting gain (loss) $ (24,231) $ 17,213 $ (64,321) $ 55,002
Schedule Of Underwriting Results For Operating Segments To Income (Loss) Before Taxes	Three Months Ended Nine Months Ended September 30, September 30, (Dollars in thousands) 2020 2019 2020 2019 Underwriting gain (loss) $ (114,606) $ (27,539) $ (35,071) $ 365,035 Net investment income 234,233 181,058 420,116 501,062 Net realized capital gains (losses) 110,203 (12,943) 84,263 109,561 Net derivative gain (loss) 2,456 (189) (1,048) 3,395 Corporate expenses (10,618) (8,435) (29,184) (22,622) Interest, fee and bond issue cost amortization expense (6,641) (7,907) (21,477) (23,972) Other income (expense) 57,481 (31,025) 48,354 (52,550) Income (loss) before taxes $ 272,508 $ 93,020 $ 465,953 $ 879,909
Schedule Of Gross Written Premiums Derived From Largest Non-U.S. Market	Three Months Ended Nine Months Ended September 30, September 30, (Dollars in thousands) 2020 2019 2020 2019 United Kingdom gross written premium $ 314,502 $ 272,297 $ 857,310 $ 743,294