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Reinsurance (List of Direct, Assumed, and Ceded Reinsurance Amounts) (Details) (USD $)
 3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Mar. 31, 2013
Hurricane Sandy [Member]
Dec. 31, 2012
Hurricane Sandy [Member]
Premiums written:        
Direct $ 528,816,000 $ 475,966,000    
Assumed 8,482,000 21,989,000    
Ceded premiums written (87,174,000) (77,783,000)    
Net 450,124,000 420,172,000    
Premiums earned:        
Direct 494,066,000 451,988,000    
Assumed 12,463,000 15,049,000    
Ceded premiums earned (85,589,000) (88,208,000)    
Net 420,940,000 378,829,000    
Loss and loss expense incurred:        
Direct 365,646,000 252,203,000 55,000,000  
Assumed 9,074,000 10,599,000    
Ceded loss and loss expense incurred (104,871,000) (9,896,000)    
Net 269,849,000 252,906,000    
Number of insurance subsidiaries 10      
Estimated flood gross losses     $ 1,094,000,000 $ 1,039,000,000
Percentage of unpaid NFIP claims ceded by federal government 100.00%