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Reinsurance (List of Direct, Assumed, and Ceded Reinsurance Amounts) (Details) (USD $)
 3 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Effects of Reinsurance [Line Items]        
Decrease in direct loss and loss expense incurred $ 46,100,000      
Premiums written:        
Direct 592,858,000 570,849,000 1,723,063,000 1,650,855,000
Assumed 5,780,000 22,053,000 19,467,000 34,913,000
Ceded premiums written (103,517,000) (100,154,000) (290,836,000) (280,719,000)
Net 495,121,000 492,748,000 1,451,694,000 1,405,049,000
Premiums earned:        
Direct 548,734,000 518,307,000 1,630,347,000 1,516,454,000
Assumed 6,789,000 11,066,000 27,359,000 32,480,000
Ceded premiums earned (92,884,000) (91,805,000) (274,947,000) (264,174,000)
Net 462,639,000 437,568,000 1,382,759,000 1,284,760,000
Loss and loss expense incurred:        
Direct 304,525,000 350,648,000 995,581,000 1,055,248,000
Assumed 5,362,000 7,264,000 20,218,000 22,758,000
Ceded loss and loss expense incurred (38,955,000) (74,595,000) (126,526,000) (245,246,000)
Net 270,932,000 283,317,000 889,273,000 832,760,000
Percentage of NFIP claims ceded by federal government     100.00%  
Hurricane Sandy [Member]
        
Effects of Reinsurance [Line Items]        
Reduction in estimated ultimate exposure 4,000,000      
Hurricane Sandy [Member] | Catastrophe excess of loss treaty [Member]
        
Effects of Reinsurance [Line Items]        
Reduction in estimated ultimate exposure $ 3,600,000