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Earnings Per Share (Tables)
 9 Months Ended
Sep. 30, 2012
Earnings Per Share [Abstract]  
Schedule Of Earnings Per Share Basic And Diluted By Common Class [Text Block]
    Three months ended  Nine months ended
   September 30, September 30,
    2012  2011  2012  2011
Earnings:           
 Net income (numerator for basic and diluted calculations)$144,475 $134,602 $408,904 $407,466
Shares:           
 Weighted average outstanding shares (denominator for           
  basic calculation) 73,776  73,856  73,690  73,680
 Equivalent shares from outstanding stock options(1) 362  398  388  527
 Denominator for diluted calculation 74,138  74,254  74,078  74,207
Earnings per share:           
  Basic$1.96 $1.82 $5.55 $5.53
  Diluted$1.95 $1.81 $5.52 $5.49
 (1) Year-to-date amounts are the weighted average of the individual quarterly amounts.