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Reinsurance (List of Direct, Assumed, and Ceded Reinsurance Amounts) (Details) (USD $)
 3 Months Ended 9 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Hurricane Sandy [Member]
Dec. 31, 2012
Hurricane Sandy [Member]
Sep. 30, 2013
National Flood Insurance Program [Member]
Hurricane Sandy [Member]
Premiums written:              
Direct $ 570,849,000 $ 520,943,000 $ 1,650,855,000 $ 1,504,429,000      
Assumed 22,053,000 17,976,000 34,913,000 44,712,000      
Ceded premiums written (100,154,000) (88,401,000) (280,719,000) (252,888,000)      
Net 492,748,000 450,518,000 1,405,049,000 1,296,253,000      
Premiums earned:              
Direct 518,307,000 474,055,000 1,516,454,000 1,389,373,000      
Assumed 11,066,000 18,595,000 32,480,000 49,683,000      
Ceded premiums earned (91,805,000) (86,425,000) (264,174,000) (261,790,000)      
Net 437,568,000 406,225,000 1,284,760,000 1,177,266,000      
Loss and loss expense incurred:              
Direct 350,648,000 327,883,000 1,055,248,000 881,537,000 128,000,000    
Assumed 7,264,000 13,970,000 22,758,000 35,039,000      
Ceded loss and loss expense incurred (74,595,000) (69,602,000) (245,246,000) (103,516,000)      
Net 283,317,000 272,251,000 832,760,000 813,060,000      
Number of insurance subsidiaries     10        
Estimated flood gross losses         1,179,000,000 1,052,000,000  
Percentage of unpaid NFIP claims ceded by federal government     100.00%        
Flood Losses Paid             $ 1,148,000,000