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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	Sep. 30, 2012	Jun. 30, 2012	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Dec. 31, 2010
Reserve For Losses And Loss Expenses [Abstract]
Outstanding loss reserves	$ 1,430,923		$ 1,366,466
Reserves for losses incurred but not reported	4,019,864		3,858,677
Reserve for losses and loss expenses	$ 5,450,787	$ 5,377,518	$ 5,225,143	$ 5,245,553	$ 5,251,304	$ 4,879,188

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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