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Premiums Receivable (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Components of premiums receivable        
Premiums receivable $ 148,374 $ 126,796    
Allowance for doubtful accounts (6,424) (5,573) (5,104) (4,917)
Premiums receivable, net $ 141,950 $ 121,223