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Reinsurance (List of Direct, Assumed, and Ceded Reinsurance Amounts) (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Premiums written:        
Direct $ 669,844 $ 631,429 $ 1,981,984 $ 1,851,620
Assumed 7,644 6,099 21,752 17,140
Ceded (98,715) (92,503) (281,464) (273,514)
Net 578,773 545,025 1,722,272 1,595,246
Premiums earned:        
Direct 627,520 590,716 1,846,587 1,728,865
Assumed 7,163 5,830 20,604 16,831
Ceded (92,254) (89,156) (270,372) (271,874)
Net 542,429 507,390 1,596,819 1,473,822
Loss and loss expense incurred:        
Direct 428,520 306,635 1,152,223 935,529
Assumed 5,929 4,224 18,424 13,114
Ceded (118,191) (25,698) (258,766) (86,922)
Net 316,258 285,161 911,881 861,721
National Flood Insurance Program [Member]        
Premiums written:        
Ceded (62,051) (62,463) (179,205) (178,784)
Premiums earned:        
Ceded (56,505) (58,340) (169,986) (176,119)
Loss and loss expense incurred:        
Ceded $ (99,200) $ (15,382) $ (164,179) $ (36,315)