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Collateralized Reinsurance And Trust Agreements (Premiums And Losses Ceded By The Company To Affiliate) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Effects of Reinsurance [Line Items]
Ceded written premiums	$ 1,604,251	$ 1,365,378	$ 1,308,940
Assumed written premiums	9,061,881	7,264,362	6,350,328
Mt. Logan Re Segregated Accounts [Member]
Effects of Reinsurance [Line Items]
Ceded written premiums	341,460	303,178	291,979
Ceded earned premiums	332,989	306,184	294,762
Ceded losses and LAE	282,233	241,347	187,192
Assumed written premiums	12,120	18,831	17,005
Assumed earned premiums	$ 12,120	$ 18,831	$ 17,005

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Assumed earned premiums

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Ceded Losses And Loss Adjustment Expenses

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Amount of written premiums assumed from other entities.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 605
-Section 50
-Paragraph 1
-Subparagraph (b)(2)
-URI http://asc.fasb.org/extlink&oid=6486672&loc=d3e27261-158547

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Amount of written premiums ceded to other entities.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 605
-Section 50
-Paragraph 1
-Subparagraph (b)(3)
-URI http://asc.fasb.org/extlink&oid=6486672&loc=d3e27261-158547

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 605
-Section 50
-Paragraph 1
-Subparagraph (c)(2)
-URI http://asc.fasb.org/extlink&oid=6486672&loc=d3e27261-158547

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