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Segment Reporting (Schedule Of Underwriting Results For Operating Segments) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Segment Reporting Information [Line Items]
Premiums earned	$ 2,656,403	$ 2,205,811	$ 7,602,640	$ 6,285,030
Incurred losses and LAE	2,274,301	1,736,210	5,571,861	4,574,066
Commission and brokerage	564,335	445,332	1,611,095	1,360,170
Other underwriting expenses	141,150	138,875	424,225	385,865
Underwriting gain (loss)	(323,383)	(114,606)	(4,541)	(35,071)
U.S. Reinsurance [Member]
Segment Reporting Information [Line Items]
Gross written premium	2,488,344	2,086,961	6,695,594	5,403,080
Net written premiums	2,292,957	1,936,851	6,265,825	4,974,034
Premiums earned	1,976,454	1,669,257	5,674,707	4,656,733
Incurred losses and LAE	1,766,197	1,335,048	4,206,243	3,361,367
Commission and brokerage	471,079	373,251	1,353,062	1,130,946
Other underwriting expenses	45,347	51,333	144,408	135,170
Underwriting gain (loss)	(306,170)	(90,375)	(29,006)	29,250
Insurance [Member]
Segment Reporting Information [Line Items]
Gross written premium	1,009,264	704,643	2,923,587	2,328,733
Net written premiums	732,832	511,829	2,123,311	1,693,603
Premiums earned	679,949	536,554	1,927,933	1,628,297
Incurred losses and LAE	508,103	401,162	1,365,619	1,212,699
Commission and brokerage	93,256	72,081	258,033	229,224
Other underwriting expenses	95,802	87,542	279,817	250,695
Underwriting gain (loss)	$ (17,213)	$ (24,231)	$ 24,465	$ (64,321)

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
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Costs incurred during the period, such as those relating to general administration and policy maintenance that do not vary with and are not primarily related to the acquisition or renewal of insurance contracts.

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Amount, after effects of policies assumed or ceded, of expense related to the provision for policy benefits and costs incurred.

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The difference between the price paid by the public and the contract price less the related expenses. A broker-dealer may underwrite a security offering by contracting to buy the issue either at a fixed price or a price based on selling the offering on a best-effort basis.

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