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Reinsurance (Ceded Premiums and Losses Related to Flood Operations) (Details) (USD $)
 3 Months Ended
Mar. 31, 2012
Mar. 31, 2011
Ceded premiums written $ (77,783,000) $ (67,160,000)
Ceded premiums earned (88,208,000) (67,425,000)
Ceded losses and loss expenses incurred (9,896,000) (24,031,000)
National Flood Insurance Program [Member]
    
Ceded premiums written (51,724,000) (48,314,000)
Ceded premiums earned (51,905,000) (47,948,000)
Ceded losses and loss expenses incurred 14,922,000 (14,540,000)
Decrease in ceded losses and loss expenses 29,500,000  
Hurricane Irene and Lee claims [Member] | National Flood Insurance Program [Member]
    
Decrease in ceded losses and loss expenses $ 15,000,000