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General (Details) (USD $)
Share data in Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
General [Abstract]    
Potentially dilutive securities (in shares) 109 62
Deferred policy acquisition cost amortization $ 123,722,000 $ 117,430,000
Advertising expenses $ 6,000,000 $ 5,000,000