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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, 2019	Dec. 31, 2018	Dec. 31, 2017
Reserve For Losses LAE And Future Policy Benefit Reserve [Abstract]
Gross basis: Beginning of period reserves	$ 347,495	$ 448,994	$ 441,111
Gross basis: Incurred losses	2,070	(2,473)	90,009
Gross basis: Paid losses	(91,644)	(99,026)	(82,126)
Gross basis: End of period reserves	257,921	347,495	448,994
Net basis: Beginning of period reserves	261,456	318,081	319,072
Net basis: Incurred losses			37,137
Net basis: Paid losses	(32,756)	(56,624)	(38,128)
Net basis: End of period reserves	$ 228,701	$ 261,456	$ 318,081

X

- Definition

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

+ References

No definition available.

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- Definition

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

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-Publisher FASB
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-Topic 944
-SubTopic 40
-Section 50
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Amount, before 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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Amount of cash outflow to settle insured claims and pay costs incurred in the claims settlement process attributable to asbestos and environmental claims.

+ References

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-Publisher FASB
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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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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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