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Significant Accounting Policies (Details 1) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2012 | Dec. 31, 2011
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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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