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Significant Accounting Policies (Details 1) (USD $) In Thousands, unless otherwise specified | Mar. 31, 2013 | Dec. 31, 2012
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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 | $ 245,166 | $ 268,458
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 | 35,812 | 44,392
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 | 13,043 | 31,970
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 | $ 196,311 | $ 192,096

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