Reinsurance (Details 4) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012
Amounts of letters of credit and cash available to us as collateral, plus other potential offsets
Payables to reinsurers	$ 194,857	$ 190,228
Letters of credit	82,115	89,832
Funds held in trust	89,050	116,597
Total credits	$ 366,022	$ 396,657