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Concentration of Risks - By Reinsurer (Details) (USD $)	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2012 Platinum Underwriters Reinsurance, Inc	Dec. 31, 2011 Platinum Underwriters Reinsurance, Inc	Dec. 31, 2012 Hannover Ruckversicherungs AG	Dec. 31, 2011 Hannover Ruckversicherungs AG	Dec. 31, 2012 Partners Reinsurance Company of the U.S.	Dec. 31, 2011 Partners Reinsurance Company of the U.S.	Dec. 31, 2101 TOA Reinsurance	Dec. 31, 2012 TOA Reinsurance	Dec. 31, 2012 QBE Reinsurance Corporation	Dec. 31, 2011 QBE Reinsurance Corporation	Dec. 31, 2012 General Reinsurance Corporation	Dec. 31, 2011 General Reinsurance Corporation
Rating by A.M. Best			A	A	A	A	A+	A+	A+	A+	A	A	A++	A++
[ReinsuranceRecoverables]	$ 6,889,344	$ 8,034,964	$ 3,852,829	$ 4,586,458	$ 1,880,015	$ 1,965,683	$ 173,658	$ 452,324	$ 446,873	$ 464,118	$ 56,263	$ 134,754	$ 462,461	$ 448,872

The known and estimated amount recoverable as of the balance sheet date from reinsurers for claims paid or incurred by the ceding insurer and associated claims settlement expenses, including estimated amounts for claims incurred but not reported, and policy benefits, net of any related valuation allowance.

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