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Earnings Per Share (Tables)
3 Months Ended
Mar. 31, 2012
Notes to Financial Statements [Abstract]  
Schedule Of Weighted Average Number Of Shares Outstanding Basic To Diluted
   
Three months ended
March 31,
 
   
2012
 
2011
 
Basic shares outstanding    
 
97,039
 
95,374
 
Effect of potential common stock    
         
Common stock awards
 
1,140
 
1,305
 
Senior subordinated convertible notes 
 
1,128
 
1,474
 
Diluted shares outstanding    
 
99,307
 
98,153