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Reinsurance (Details) (USD $)
6 Months Ended
Jun. 30, 2011
Dec. 31, 2010
Jun. 30, 2010
Dec. 31, 2009
Reinsurance [Abstract]        
Reinsurance recoverable on loss reserves $ 206,170,000 $ 275,290,000 $ 339,542,000 $ 332,227,000
Reinsurance recoverable on loss reserves related to captive agreements 186,000,000 248,000,000    
Total fair value of the trust fund assets under our captive agreements 451,000,000 510,000,000    
Trust fund assets transferred to us as a result of captive terminations $ 3,000,000