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Shareholders' Equity and Earnings per Share (Tables)
9 Months Ended
Sep. 30, 2011
Shareholders' Equity and Earnings per Share [Abstract] 
Presentation of information about basic and diluted weighted-average shares outstanding
The following table presents information about basic and diluted weighted-average shares outstanding:
 
                 
(in thousands)  Three months ended
September 30,		   Nine months ended
September 30,		 
   2011   2010   2011   2010 
Weighted-average shares outstanding:
                    
Basic
   161,789     166,731     166,318     166,513  
Share options
   487     1,060     996     1,070  
   
 
 
   
 
 
   
 
 
   
 
 
 
Diluted weighted-average shares outstanding
   162,276     167,791     167,314     167,583  
   
 
 
   
 
 
   
 
 
   
 
 
 
Anti-dilutive share awards
   4,049     3,801     1,652     3,344