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Significant Accounting Policies (Details 1) (USD $) In Thousands, unless otherwise specified | Jun. 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 | $ 235,334 | $ 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 | 193,250 | 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 | $ 42,084 |

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