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Segment Reporting (Schedule Of Underwriting Results For Operating Segments) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Segment Reporting Information [Line Items]
Premiums earned	$ 1,732,697	$ 1,619,427
Incurred losses and LAE	1,048,550	1,057,177
Commission and brokerage	389,474	357,639
Other underwriting expenses	98,985	96,284
U.S. Reinsurance [Member]
Segment Reporting Information [Line Items]
Gross written premiums	764,146	644,222
Net written premiums	669,707	545,831
Premiums earned	626,471	563,385
Incurred losses and LAE	320,104	545,193
Commission and brokerage	167,102	127,320
Other underwriting expenses	15,591	16,886
Underwriting gain (loss)	123,674	(126,014)
International [Member]
Segment Reporting Information [Line Items]
Gross written premiums	400,054	366,724
Net written premiums	375,505	345,155
Premiums earned	350,935	343,604
Incurred losses and LAE	254,135	127,024
Commission and brokerage	81,425	82,177
Other underwriting expenses	8,681	10,576
Underwriting gain (loss)	6,694	123,827
Bermuda [Member]
Segment Reporting Information [Line Items]
Gross written premiums	367,851	415,686
Net written premiums	349,341	394,968
Premiums earned	330,113	319,134
Incurred losses and LAE	197,959	129,513
Commission and brokerage	74,110	81,487
Other underwriting expenses	11,497	10,133
Underwriting gain (loss)	46,547	98,001
Insurance [Member]
Segment Reporting Information [Line Items]
Gross written premiums	595,057	504,975
Net written premiums	457,145	386,252
Premiums earned	425,178	393,304
Incurred losses and LAE	276,352	255,447
Commission and brokerage	66,837	66,655
Other underwriting expenses	63,216	58,689
Underwriting gain (loss)	$ 18,773	$ 12,513

X

- Definition

Amount, before premiums ceded to other entities and premiums assumed by the entity, of premiums written.

+ References

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-Publisher FASB
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