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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, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
Ceded premiums written $ (88,401) $ (79,511) $ (252,888) $ (221,300)
Ceded premiums earned (86,425) (73,894) (261,790) (210,067)
Ceded losses and loss expenses incurred (69,602) (338,238) (103,516) (388,416)
National Flood Insurance Program [Member]
       
Ceded premiums written (58,923) (55,198) (171,172) (158,777)
Ceded premiums earned (53,222) (50,256) (157,895) (147,111)
Ceded losses and loss expenses incurred $ (32,702) $ (301,725) $ (24,534) $ (331,604)