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Reserve For Losses, LAE And Future Policy Benefit Reserve (Summary Of Incurred Losses With Respect To A&E Reserve On Both Gross And Net Of Reinsurance Basis) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Reserve For Losses LAE And Future Policy Benefit Reserve [Abstract]
Gross basis: Beginning of period reserves	$ 257,921	$ 347,495	$ 448,994
Gross basis: Incurred losses	1,540	2,070	(2,473)
Gross basis: Paid losses	(40,120)	(91,644)	(99,026)
Gross basis: End of period reserves	219,341	257,921	347,495
Net basis: Beginning of period reserves	228,701	261,456	318,081
Net basis: Incurred losses	(772)
Net basis: Paid losses	(29,674)	(32,756)	(56,624)
Net basis: End of period reserves	$ 198,255	$ 228,701	$ 261,456

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- References

No definition available.

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Reserve For Losses LAE And Future Policy Benefit Reserve [Abstract]

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No definition available.

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Carrying amount as of the balance sheet date of reserves for the costs of settling insured claims and costs incurred in the claims settlement process attributable to asbestos and environmental claims, before estimated recoveries from reinsurers.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 40
-Section 50
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Amount of cash outflow to settle insured claims and pay costs incurred in the claims settlement process attributable to asbestos and environmental claims.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
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Carrying amount as of the balance sheet date of reserves for the costs of settling insured claims and costs incurred in the claims settlement process attributable to asbestos and environmental claims, net of estimated reinsurance recoveries.

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Amount, after effects of reinsurance, of expense for claims incurred and costs incurred in the claim settlement process attributable to asbestos and environmental claims.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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Amount, after effects of reinsurance, of payments to settle insured claims and pay costs incurred in the claims settlement process attributable to asbestos and environmental claims.

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