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Reinsurance Reinsurance (List of direct, assumed and ceded Reinsurance Amounts) (Details) (USD $)
 3 Months Ended 12 Months Ended
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2011
Sep. 30, 2011
Jun. 30, 2011
Mar. 31, 2011
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Premiums Written:                      
Direct                 $ 1,955,667,000 $ 1,725,393,000 $ 1,634,415,000
Assumed                 50,938,000 51,515,000 25,254,000
Ceded premiums written                 (339,722,000) (291,559,000) (269,128,000)
Net                 1,666,883,000 1,485,349,000 1,390,541,000
Premiums Earned:                      
Direct                 1,873,007,000 1,693,021,000 1,654,301,000
Assumed                 65,884,000 29,011,000 26,619,000
Ceded premiums earned                 (354,772,000) (282,719,000) (264,322,000)
Total Net Premiums Earned 406,853,000 406,225,000 392,212,000 378,829,000 373,427,000 358,963,000 355,580,000 351,343,000 1,584,119,000 1,439,313,000 1,416,598,000
Losses and loss expenes incurred:                      
Direct                 2,394,640,000 1,499,340,000 1,102,326,000
Assumed                 29,175,000 20,788,000 14,994,000
Ceded losses and loss expenses incurred                 (1,302,825,000) (445,141,000) (135,202,000)
Net                 1,120,990,000 1,074,987,000 982,118,000
Hurricane Sandy [Member]
                      
Losses and loss expenes incurred:                      
Losses on a gross basis                 136,000,000    
Losses on a net basis                 46,600,000    
Flood loss handling fee                 18,300,000    
Hurricane Sandy [Member] | National Flood Insurance Program [Member]
                      
Losses and loss expenes incurred:                      
Ceded losses and loss expenses incurred                 (1,000,000,000)    
Hurricane Sandy [Member] | Catatrophe excess of loss treaty [Member]
                      
Losses and loss expenes incurred:                      
Ceded losses and loss expenses incurred                 (89,400,000)    
Hurricane Irene [Member]
                      
Losses and loss expenes incurred:                      
Losses on a gross basis                   46,500,000  
Losses on a net basis                   39,600,000  
Flood loss handling fee                   7,100,000  
Hurricane Irene [Member] | National Flood Insurance Program [Member]
                      
Losses and loss expenes incurred:                      
Ceded losses and loss expenses incurred                   (177,000,000)  
Hurricane Irene [Member] | Catatrophe excess of loss treaty [Member]
                      
Losses and loss expenes incurred:                      
Ceded losses and loss expenses incurred                   $ (6,900,000)