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General (Details) (USD $)
3 Months Ended 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
General [Abstract]        
Potentially dilutive securities (in shares) 108,000 133,000 77,000 115,000
Deferred policy acquisition cost amortization $ 121,906,000 $ 121,016,000 $ 357,062,000 $ 365,649,000
Advertising expenses     $ 15,000,000 $ 16,000,000