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Reinsurance (Ceded Premiums and Losses Related to Flood Operations) (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Ceded premiums written $ (94,235) $ (98,328) $ (181,011) $ (187,319)
Ceded premiums earned (90,891) (91,673) (182,718) (182,063)
Ceded loss and loss expense incurred (29,315) (42,289) (61,224) (87,571)
National Flood Insurance Program [Member]        
Ceded premiums written (62,479) (65,775) (116,321) (123,078)
Ceded premiums earned (58,781) (59,213) (117,779) (117,499)
Ceded loss and loss expense incurred $ (14,684) $ (26,712) $ (20,933) $ (34,091)