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Other Comprehensive Income (Table)
3 Months Ended
Dec. 31, 2011
Other Comprehensive Income  
Schedule of Other Comprehensive Income (Loss) [Table Text Block]
         
   Three months ended December 31, 
   2011 2010 
Net income$ 13,196 $ 10,828 
Other comprehensive income (loss):      
 Foreign currency translation   (625)   (1,048) 
  Total comprehensive income$ 12,571 $ 9,780