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Earnings Per Share (Tables)
 6 Months Ended
Jun. 30, 2012
Earnings Per Share [Abstract]  
Schedule Of Earnings Per Share Basic And Diluted By Common Class [Text Block]
    Three months ended  Six months ended
   June 30, June 30,
    2012  2011  2012  2011
Earnings:           
 Net income (numerator for basic and diluted calculations)$141,111 $123,944 $264,429 $272,864
Shares:           
 Weighted average outstanding shares (denominator for           
  basic calculation) 73,718  73,971  73,646  73,593
 Equivalent shares from outstanding stock options(1) 336  559  402  591
 Denominator for diluted calculation 74,054  74,530  74,048  74,184
Earnings per share:           
  Basic$1.91 $1.68 $3.59 $3.71
  Diluted$1.91 $1.66 $3.57 $3.68
 (1) Year-to-date amounts are the weighted average of the individual quarterly amounts.