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Segment Reporting (Schedule Of Underwriting Results For Operating Segments) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Segment Reporting Information [Line Items]
Premiums earned	$ 2,387,865	$ 2,036,814
Incurred losses and LAE	1,711,419	1,430,840
Commission and brokerage	489,011	448,522
Other underwriting expenses	142,231	128,860
Underwriting gain (loss)	45,204	28,592
U.S. Reinsurance [Member]
Segment Reporting Information [Line Items]
Gross written premiums	2,059,015	1,777,771
Net written premiums	1,912,950	1,613,094
Premiums earned	1,777,452	1,485,221
Incurred losses and LAE	1,271,906	1,020,642
Commission and brokerage	408,724	370,356
Other underwriting expenses	51,996	44,139
Underwriting gain (loss)	44,826	50,084
Insurance [Member]
Segment Reporting Information [Line Items]
Gross written premiums	872,418	793,100
Net written premiums	640,987	588,385
Premiums earned	610,413	551,593
Incurred losses and LAE	439,513	410,198
Commission and brokerage	80,287	78,166
Other underwriting expenses	90,235	84,721
Underwriting gain (loss)	$ 378	$ (21,492)

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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