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Reinsurance (Details 3) (USD $)
In Thousands
Sep. 30, 2011
Dec. 31, 2010
Amounts of letters of credit and cash deposits held by us as collateral, plus other credits available for potential offset  
Payables to reinsurers$ 230,503$ 243,990
Letters of credit135,299145,914
Cash deposits91,38081,966
Total credits$ 457,182$ 471,870