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Reserve For Losses And Loss Expenses (Schedule Of Reserve For Losses And Loss Expenses) (Details) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2011
Reserve For Losses And Loss Expenses [Abstract]
Outstanding loss reserves	$ 1,509,350		$ 1,539,114
Reserves for losses incurred but not reported	4,187,515		4,106,435
Reserve for losses and loss expenses	$ 5,696,865	$ 5,673,220	$ 5,645,549	$ 5,377,518	$ 5,331,418	$ 5,225,143

The estimated cost of settling claims under the terms of the underlying insurance policies and assumed and ceded insurance contracts as of the balance sheet date, including an estimate for claims which have been incurred but not reported and the actual and estimated costs of settling claims.

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- Definition

Estimated costs as of the balance sheet date of settling insured claims and costs incurred in the claims settlement process for claims that have not yet been submitted to the insurance company for reimbursement.

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