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Reinsurance (Ceded Premiums and Losses Related to Flood Operations) (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Ceded premiums written $ (367,284) $ (339,722) $ (291,559)
Ceded premiums earned (356,922) (354,772) (282,719)
Ceded losses and loss expenses incurred (281,233) (1,302,825) (445,141)
National Flood Insurance Program [Member]
      
Ceded premiums written (236,309) (221,094) (206,711)
Ceded premiums earned (228,650) (212,177) (198,153)
Ceded losses and loss expenses incurred $ (183,142) $ (1,119,303) $ (352,619)