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Goodwill
 6 Months Ended
Jun. 30, 2011
Goodwill [Abstract]  
Goodwill
5.
GOODWILL

The changes in the carrying amount of goodwill by operating segment from December 31, 2009 to June 30, 2011 consist of the following (in thousands):

   
United States
  
International
  
Total
 
Goodwill, December 31, 2009
 $55,260  $25,061  $80,321 
Effect of foreign currency translation
  ¾   (719)  (719)
Goodwill, December 31, 2010
  55,260   24,342   79,602 
Effect of foreign currency translation
  ¾   864   864 
Goodwill, June 30, 2011 
 $55,260  $25,206  $80,466