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Significant Accounting Policies (Details 1) (USD $) In Thousands, unless otherwise specified | Sep. 30, 2012 | Dec. 31, 2011
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Unsecured amounts due from reinsurers whose aggregate balance exceeds 3% of the stockholders equity |  |
Reinsurance unsecured amounts due from reinsurers total | $ 239,663 | $ 295,419
Everest Reinsurance Company [Member] |  |
Unsecured amounts due from reinsurers whose aggregate balance exceeds 3% of the stockholders equity |  |
Reinsurance unsecured amounts due from reinsurers total | 45,236 | 264,997
Florida Hurricane Catastrophe Fund [Member] |  |
Unsecured amounts due from reinsurers whose aggregate balance exceeds 3% of the stockholders equity |  |
Reinsurance unsecured amounts due from reinsurers total |  | 30,422
Odyssey Reinsurance Company [Member] |  |
Unsecured amounts due from reinsurers whose aggregate balance exceeds 3% of the stockholders equity |  |
Reinsurance unsecured amounts due from reinsurers total | $ 194,427 |

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