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Segment Reporting (Schedule Of Underwriting Results For Operating Segments) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Segment Reporting Information [Line Items]
Premiums earned	$ 1,817,299	$ 1,729,818	$ 3,549,996	$ 3,349,245
Incurred losses and LAE	1,094,630	1,341,314	2,143,180	2,398,491
Commission and brokerage	420,950	383,402	810,424	741,041
Other underwriting expenses	104,833	93,099	203,818	189,383
Underwriting gain (loss)	196,886	(87,997)	392,574	20,330
U.S. Reinsurance [Member]
Segment Reporting Information [Line Items]
Gross written premiums	641,764	652,109	1,405,910	1,296,331
Net written premiums	506,840	566,303	1,176,547	1,112,134
Premiums earned	620,780	603,884	1,247,251	1,167,269
Incurred losses and LAE	351,725	509,653	671,829	1,054,846
Commission and brokerage	172,602	148,712	339,704	276,032
Other underwriting expenses	15,727	15,472	31,318	32,358
Underwriting gain (loss)	80,726	(69,953)	204,400	(195,967)
International [Member]
Segment Reporting Information [Line Items]
Gross written premiums	372,861	399,024	772,915	765,748
Net written premiums	357,917	355,309	733,422	700,464
Premiums earned	360,075	363,795	711,010	707,399
Incurred losses and LAE	212,972	301,406	467,107	428,430
Commission and brokerage	88,170	92,088	169,595	174,265
Other underwriting expenses	9,835	10,349	18,516	20,925
Underwriting gain (loss)	49,098	(40,048)	55,792	83,779
Bermuda [Member]
Segment Reporting Information [Line Items]
Gross written premiums	394,962	369,440	762,813	785,126
Net written premiums	369,929	355,236	719,270	750,204
Premiums earned	362,905	353,698	693,018	672,832
Incurred losses and LAE	218,385	250,097	416,344	379,610
Commission and brokerage	84,606	80,318	158,716	161,805
Other underwriting expenses	11,868	10,762	23,365	20,895
Underwriting gain (loss)	48,046	12,521	94,593	110,522
Insurance [Member]
Segment Reporting Information [Line Items]
Gross written premiums	757,068	645,948	1,352,125	1,150,923
Net written premiums	549,297	469,530	1,006,442	855,782
Premiums earned	473,539	408,441	898,717	801,745
Incurred losses and LAE	311,548	280,158	587,900	535,605
Commission and brokerage	75,572	62,284	142,409	128,939
Other underwriting expenses	67,403	56,516	130,619	115,205
Underwriting gain (loss)	$ 19,016	$ 9,483	$ 37,789	$ 21,996

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
-Name Accounting Standards Codification
-Topic 944
-SubTopic 605
-Section 50
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