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Reinsurance (List of Direct, Assumed, and Ceded Reinsurance Amounts) (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Premiums written:        
Direct $ 572,314 $ 551,190 $ 1,130,205 $ 1,080,006
Assumed 5,837 4,378 13,687 12,860
Ceded premiums written (98,328) (93,391) (187,319) (180,565)
Net 479,823 462,177 956,573 912,301
Premiums earned:        
Direct 544,913 504,081 1,081,613 998,147
Assumed 10,385 8,951 20,570 21,414
Ceded premiums earned (91,673) (86,780) (182,063) (172,369)
Net 463,625 426,252 920,120 847,192
Loss and loss expense incurred:        
Direct 332,707 338,954 691,056 704,600
Assumed 7,377 6,420 14,856 15,494
Ceded loss and loss expense incurred (42,289) (65,780) (87,571) (170,651)
Net $ 297,795 $ 279,594 $ 618,341 $ 549,443
Number of insurance subsidiaries     10  
Percentage of NFIP claims ceded by federal government     100.00%