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The amount needed to reflect the estimated ultimate cost of settling claims relating to insured events that have occurred on or before the balance sheet date, whether or not reported to the insurer at that date.

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- Definition

Amount, after valuation allowance, recoverable under reinsurance contracts for losses reported to the ceding insurer but not yet paid and amounts expected for incurred losses and settlement expenses, which have not yet been reported to the ceding insurer.

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Undiscounted amount, after reinsurance, of the liability for unpaid claims and allocated claim adjustment expense for short-duration insurance contracts. Excludes unallocated claim adjustment expense.

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Amount of reconciling item for the reconciliation of the liability in the disclosure of claims development (in excess of) less than the liability for unpaid claims and claims adjustment expense for short-duration insurance contracts, classified as other.

+ References

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- Definition

Amount of liability for unallocated claim adjustment expense for short-duration insurance contracts.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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No definition available.

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Reserve For Losses, LAE And Future Policy Benefit Reserve (Reconciliation of the Net Incurred and Paid Claims Development) (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Shortduration Insurance Contracts Reconciliation Of Claims Development To Liability [Line Items]
Liabilities for claims and claim adjustment expenses, net of reinsurance	$ 11,768,596
Total reinsurance recoverable on unpaid claims	1,640,712
Unallocated claims adjustment expenses	163,563
Other	38,442
Total expenses	202,005
Total gross liability for unpaid claims and claim adjustment expense	13,611,313	$ 13,119,090	$ 11,884,321	$ 10,312,313
U.S. Reinsurance [Member] \| Casualty Business [Member]
Shortduration Insurance Contracts Reconciliation Of Claims Development To Liability [Line Items]
Liabilities for claims and claim adjustment expenses, net of reinsurance	2,196,410
Total reinsurance recoverable on unpaid claims	363,925
U.S. Reinsurance [Member] \| Property Business [Member]
Shortduration Insurance Contracts Reconciliation Of Claims Development To Liability [Line Items]
Liabilities for claims and claim adjustment expenses, net of reinsurance	1,572,727
Total reinsurance recoverable on unpaid claims	207,967
International [Member] \| Casualty Business [Member]
Shortduration Insurance Contracts Reconciliation Of Claims Development To Liability [Line Items]
Liabilities for claims and claim adjustment expenses, net of reinsurance	918,411
Total reinsurance recoverable on unpaid claims	91,193
International [Member] \| Property Business [Member]
Shortduration Insurance Contracts Reconciliation Of Claims Development To Liability [Line Items]
Liabilities for claims and claim adjustment expenses, net of reinsurance	1,425,530
Total reinsurance recoverable on unpaid claims	149,803
Bermuda [Member] \| Casualty Business [Member]
Shortduration Insurance Contracts Reconciliation Of Claims Development To Liability [Line Items]
Liabilities for claims and claim adjustment expenses, net of reinsurance	2,310,321
Total reinsurance recoverable on unpaid claims	9,975
Bermuda [Member] \| Property Business [Member]
Shortduration Insurance Contracts Reconciliation Of Claims Development To Liability [Line Items]
Liabilities for claims and claim adjustment expenses, net of reinsurance	664,204
Total reinsurance recoverable on unpaid claims	68,639
Insurance [Member] \| Casualty Business [Member]
Shortduration Insurance Contracts Reconciliation Of Claims Development To Liability [Line Items]
Liabilities for claims and claim adjustment expenses, net of reinsurance	2,477,716
Total reinsurance recoverable on unpaid claims	631,827
Insurance [Member] \| Property Business [Member]
Shortduration Insurance Contracts Reconciliation Of Claims Development To Liability [Line Items]
Liabilities for claims and claim adjustment expenses, net of reinsurance	203,277
Total reinsurance recoverable on unpaid claims	$ 117,382