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Stock-Based Compensation Expense (Tables)
9 Months Ended
Sep. 30, 2011
Stock-Based Compensation Expense [Abstract] 
Summary Of Stock-Based Compensation Expense
   
Three Months Ended September 30,
    
Nine Months Ended September 30,
  
   
2011
    
2010
    
2011
    
2010
  
Stock options
  
$
1,209
    
$
1,478
    
$
3,709
    
$
4,503
  
Restricted common stock
    
33
      
300
      
321
      
1,414
  
Restricted stock units
    
1,299
      
938
      
3,953
      
2,411
  
Performance stock units
    
204
      
134
      
730
      
351
  
                                 
Total stock-based compensation expense
  
$
2,745
    
$
2,850
    
$
8,713
    
$
8,679