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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, 2019	Dec. 31, 2018	Dec. 31, 2017
Effects of Reinsurance [Line Items]
Ceded written premiums	$ 1,308,940	$ 1,060,726	$ 929,261
Assumed written premiums	6,350,328	6,234,203	5,090,367
Mt. Logan Re Segregated Accounts [Member]
Effects of Reinsurance [Line Items]
Ceded written premiums	291,979	260,612	245,453
Ceded earned premiums	294,762	262,518	242,793
Ceded losses and LAE	187,192	319,046	320,315
Assumed written premiums	17,005	11,032	25,970
Assumed earned premiums	17,005	11,032	25,970
Assumed losses and LAE

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Assumed earned premiums

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Assumed Losses And Loss Adjustment Expenses

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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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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

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-URI http://asc.fasb.org/extlink&oid=6486672&loc=d3e27261-158547

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