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Reinsurance (Details Textual) (USD $) In Billions, unless otherwise specified	6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011
Reinsurance and Insurance Operations (Textual) [Abstract]
In-force policyholder coverage for windstorm exposures	$ 126.2
Percentage of premium ceded	45.00%	50.00%
Increase in profitability over the contract term	5.00%

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- Definition

Increase in profitability over the contract term.

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- Definition

In force policyholder coverage for windstorm exposures.

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- Definition

Percentage of premium ceded.

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