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Reinsurance (Ceded Premiums and Losses Related to Flood Operations) (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Ceded premiums written $ (100,154) $ (88,401) $ (280,719) $ (252,888)
Ceded premiums earned (91,805) (86,425) (264,174) (261,790)
Ceded loss and loss expense incurred (74,595) (69,602) (245,246) (103,516)
National Flood Insurance Program [Member]
       
Ceded premiums written (64,196) (58,923) (183,364) (171,172)
Ceded premiums earned (57,920) (53,222) (169,697) (157,895)
Ceded loss and loss expense incurred $ (34,879) $ (32,702) $ (162,780) $ (24,534)