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Reinsurance (List of Direct, Assumed, and Ceded Reinsurance Amounts) (Details) (USD $)
 3 Months Ended 6 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Hurricane Sandy [Member]
Dec. 31, 2012
Hurricane Sandy [Member]
Jun. 30, 2013
National Flood Insurance Program [Member]
Hurricane Sandy [Member]
Premiums written:              
Direct $ 551,190,000 $ 507,520,000 $ 1,080,006,000 $ 983,486,000      
Assumed 4,378,000 4,747,000 12,860,000 26,736,000      
Ceded premiums written (93,391,000) (86,704,000) (180,565,000) (164,487,000)      
Net 462,177,000 425,563,000 912,301,000 845,735,000      
Premiums earned:              
Direct 504,081,000 463,330,000 998,147,000 915,318,000      
Assumed 8,951,000 16,039,000 21,414,000 31,088,000      
Ceded premiums earned (86,780,000) (87,157,000) (172,369,000) (175,365,000)      
Net 426,252,000 392,212,000 847,192,000 771,041,000      
Loss and loss expense incurred:              
Direct 338,954,000 301,451,000 704,600,000 553,654,000 75,000,000    
Assumed 6,420,000 10,470,000 15,494,000 21,069,000      
Ceded loss and loss expense incurred (65,780,000) (24,018,000) (170,651,000) (33,914,000)      
Net 279,594,000 287,903,000 549,443,000 540,809,000      
Number of insurance subsidiaries     10        
Estimated flood gross losses         1,127,000,000 1,052,000,000  
Percentage of unpaid NFIP claims ceded by federal government     100.00%        
Flood Losses Paid             $ 1,108,000,000