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Reinsurance (Details Textual) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2012
Reinsurers
Jun. 30, 2011
Jun. 30, 2012
Reinsurers
Jun. 30, 2011
Dec. 31, 2011
Reinsurers
Reinsurance (Textual) [Abstract]          
Recoveries pertaining to reinsurance contracts $ 0 $ 0 $ 0 $ 0  
Number of reinsurers 31   31   18