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Losses and Loss Expenses (Details) - Components of Loss Reserves (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Unpaid losses and loss expenses are comprised of:
Reserve for reported losses and loss expenses	$ 7,976,121	$ 8,153,585
Reserve for losses incurred but not reported	12,508,000	12,460,316
Unpaid losses and loss expenses at end of year	$ 20,484,121	$ 20,613,901	$ 20,531,607	$ 20,823,524

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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