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Other Revenues and Expenses (Details) (USD $)
1 Months Ended 12 Months Ended
Jun. 30, 2008
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Luxembourg Reinsurance Companies [Member]
       
Other revenues and expenses        
Gross insurance premium income   $ 37,000,000 $ 35,000,000 $ 3,100,000
Gross reinsurance premium expense   37,000,000 35,000,000 3,100,000
October LLC [Member]
       
Other revenues and expenses        
Sale Leaseback Transaction, Term of Lease 67 months      
Gain (Loss) on Disposition of Assets 500,000      
Sale Leaseback Transaction, Current Period Gain Recognized 2,800,000      
Sale Leaseback Transaction, Net Proceeds   500,000 500,000 500,000
Sale Leaseback Transaction, Minimum Assets Balance   6,500,000,000    
Sale Leaseback Transaction, Annual Rental Payments   $ 1,800,000