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Significant Accounting Policies (Details 1) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
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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Reinsurance unsecured amounts due from reinsurers.

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