Georgia Duplicate Premium Payments (Details) (USD $) In Thousands, except Per Share data	3 Months Ended	6 Months Ended
Jun. 30, 2011	Jun. 30, 2011
Georgia Duplicate Premium Payments (Textuals) [Abstract]
Change in estimate of Georgia duplicate premium payment liability	$ 13,800	$ 10,800
Diluted earnings per share impact from change in estimate of Georgia duplicate premium payment liability	$ 0.16	$ 0.13

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