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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, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Premiums written:        
Direct $ 753,363 $ 706,408 $ 1,467,597 $ 1,390,228
Assumed 6,536 6,488 12,807 12,179
Ceded (104,651) (99,082) (200,596) (189,889)
Net 655,248 613,814 1,279,808 1,212,518
Premiums earned:        
Direct 696,723 654,588 1,380,456 1,301,316
Assumed 6,612 6,063 12,736 11,842
Ceded (98,499) (92,621) (196,528) (184,274)
Net 604,836 568,030 1,196,664 1,128,884
Loss and loss expenses incurred:        
Direct 391,014 389,550 811,930 731,672
Assumed 2,364 7,766 10,368 12,203
Ceded (27,050) (55,757) (71,029) (84,844)
Net 366,328 341,559 751,269 659,031
National Flood Insurance Program [Member]        
Premiums written:        
Ceded (66,341) (63,808) (123,010) (120,142)
Premiums earned:        
Ceded (60,143) (57,655) (119,134) (114,932)
Loss and loss expenses incurred:        
Ceded $ (10,261) $ (15,140) $ (25,980) $ (21,681)