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Supplemental Information
6 Months Ended
Jun. 30, 2011
Supplemental Information [Abstract]  
Supplemental Information
(11) Supplemental Information
Supplemental information was as follows:
                                 
    Six months ended June 30,   Three months ended June 30,
    2011   2010   2011   2010
Income taxes paid
  $ 57,607     $ 66,215     $ 38,501     $ 53,365  
Interest paid
    12,152       9,563       9,866       9,341  
Proceeds from sales of available for sale fixed income securities
    246,331       133,856       197,399       66,167  
Comprehensive income
    165,169       182,751       119,888       114,814