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Reinsurance (List of Direct, Assumed, and Ceded Reinsurance Amounts) (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Premiums written:        
Direct $ 706,408 $ 665,862 $ 1,390,228 $ 1,312,140
Assumed 6,488 7,788 12,179 14,108
Ceded (99,082) (95,510) (189,889) (182,749)
Net 613,814 578,140 1,212,518 1,143,499
Premiums earned:        
Direct 654,588 612,406 1,301,316 1,219,067
Assumed 6,063 7,171 11,842 13,441
Ceded (92,621) (87,645) (184,274) (178,118)
Net 568,030 531,932 1,128,884 1,054,390
Loss and loss expense incurred:        
Direct 389,550 362,064 731,672 723,703
Assumed 7,766 6,140 12,203 12,495
Ceded (55,757) (69,725) (84,844) (140,575)
Net 341,559 298,479 659,031 595,623
National Flood Insurance Program [Member]        
Premiums written:        
Ceded (63,808) (63,906) (120,142) (117,154)
Premiums earned:        
Ceded (57,655) (56,667) (114,932) (113,481)
Loss and loss expense incurred:        
Ceded $ (15,140) $ (24,261) $ (21,681) $ (64,979)