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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, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Premiums written:        
Direct $ 706,918 $ 669,844 $ 2,097,146 $ 1,981,984
Assumed 8,506 7,644 20,685 21,752
Ceded (111,147) (98,715) (301,036) (281,464)
Net 604,277 578,773 1,816,795 1,722,272
Premiums earned:        
Direct 666,048 627,520 1,967,364 1,846,587
Assumed 7,623 7,163 19,465 20,604
Ceded (101,616) (92,254) (285,890) (270,372)
Net 572,055 542,429 1,700,939 1,596,819
Loss and loss expenses incurred:        
Direct 455,728 428,520 1,187,400 1,152,223
Assumed 5,420 5,929 17,623 18,424
Ceded (116,561) (118,191) (201,405) (258,766)
Net 344,587 316,258 1,003,618 911,881
National Flood Insurance Program [Member]        
Premiums written:        
Ceded (68,132) (62,051) (188,274) (179,205)
Premiums earned:        
Ceded (59,847) (56,505) (174,779) (169,986)
Loss and loss expenses incurred:        
Ceded $ (112,994) $ (99,200) $ (134,675) $ (164,179)