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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, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Premiums written:        
Direct $ 621,408 $ 572,314 $ 1,220,191 $ 1,130,205
Assumed 4,960 5,837 11,041 13,687
Ceded premiums written (94,235) (98,328) (181,011) (187,319)
Net 532,133 479,823 1,050,221 956,573
Premiums earned:        
Direct 576,107 544,913 1,138,149 1,081,613
Assumed 5,093 10,385 11,001 20,570
Ceded premiums earned (90,891) (91,673) (182,718) (182,063)
Net 490,309 463,625 966,432 920,120
Loss and loss expense incurred:        
Direct 316,648 332,707 628,894 691,056
Assumed 4,228 7,377 8,890 14,856
Ceded loss and loss expense incurred (29,315) (42,289) (61,224) (87,571)
Net $ 291,561 $ 297,795 $ 576,560 $ 618,341
Percentage of NFIP claims ceded by federal government     100.00%