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RESERVE FOR LOSSES AND LOSS EXPENSES (DETAILS) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009	Dec. 31, 2008
RESERVE FOR LOSSES AND LOSS EXPENSES [Abstract]
Reserve for reported losses and loss expenses	$ 3,019,372	$ 2,097,484
Reserve for losses incurred but not reported	5,405,673	4,934,891
Reserve for losses and loss expenses	$ 8,425,045	$ 7,032,375	$ 6,564,133	$ 6,244,783

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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