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Significant Accounting Policies (Details 1) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Unsecured net amounts due from reinsurers whose aggregate balance exceeded 3% of the stockholders' equity
Reinsurance unsecured amounts due from reinsurers total	$ 268,458	$ 295,419
Everest Reinsurance Company [Member]
Unsecured net amounts due from reinsurers whose aggregate balance exceeded 3% of the stockholders' equity
Reinsurance unsecured amounts due from reinsurers total	44,392	264,997
Florida Hurricane Catastrophe Fund [Member]
Unsecured net amounts due from reinsurers whose aggregate balance exceeded 3% of the stockholders' equity
Reinsurance unsecured amounts due from reinsurers total	31,970	30,422
Odyssey Reinsurance Company [Member]
Unsecured net amounts due from reinsurers whose aggregate balance exceeded 3% of the stockholders' equity
Reinsurance unsecured amounts due from reinsurers total	$ 192,096

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Reinsurance unsecured amounts due from reinsurers.

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