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Common Share Repurchases (Tables)
9 Months Ended
Sep. 30, 2011
Equity Abstract 
Common Share Repurchases
 Nine Months Ended
 September 30,
 2011 2010
(Dollars and shares in thousands, except cost per share)     
      
Number of shares 1,276  970
Average cost per share$48.82 $41.79
Total cost$62,294 $40,520