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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, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Premiums written:        
Direct $ 665,862 $ 621,408 $ 1,312,140 $ 1,220,191
Assumed 7,788 4,960 14,108 11,041
Ceded (95,510) (94,235) (182,749) (181,011)
Net 578,140 532,133 1,143,499 1,050,221
Premiums earned:        
Direct 612,406 576,107 1,219,067 1,138,149
Assumed 7,171 5,093 13,441 11,001
Ceded (87,645) (90,891) (178,118) (182,718)
Net 531,932 490,309 1,054,390 966,432
Loss and loss expense incurred:        
Direct 362,064 316,648 723,703 628,894
Assumed 6,140 4,228 12,495 8,890
Ceded (69,725) (29,315) (140,575) (61,224)
Net 298,479 291,561 595,623 576,560
National Flood Insurance Program [Member]        
Premiums written:        
Ceded (63,906) (62,479) (117,154) (116,321)
Premiums earned:        
Ceded (56,667) (58,781) (113,481) (117,779)
Loss and loss expense incurred:        
Ceded $ (24,261) $ (14,684) $ (64,979) $ (20,933)