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Other Noncurrent Assets (Tables)
 6 Months Ended
Jun. 30, 2011
Other Noncurrent Assets  
Schedule Of Other Noncurrent Assets
   
June 30,
    
December 31,
  
     
2011
      
2010
  
                 
Investment in long-term product supply arrangements
  
$
12,452
    
$
12,120
  
Customer acquisition costs, net
    
13,229
      
5,470
  
Other assets
    
13,925
      
12,374
  
   
$
39,606
    
$
29,964