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Reserve for Losses and Loss Expenses (Schedule of Reserve for Losses and Loss Expenses) (Details) (USD $) In Thousands	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2010	Jun. 30, 2010	Mar. 31, 2010	Dec. 31, 2009
Reserve for Losses and Loss Expenses
Outstanding loss reserves	$ 1,462,144		$ 1,166,516
Reserves for losses incurred but not reported	3,789,160		3,712,672
Reserve for losses and loss expenses	$ 5,251,304	$ 5,100,643	$ 4,879,188	$ 4,920,435	$ 4,853,359	$ 4,761,772

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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- Definition

The accrued obligation as of the balance sheet date which represents the cost of settling insured claims and insured claims relating to insured events that have occurred but have not yet been reported to the insurer or reinsurer as of the date of the financial statements.

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