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Other Comprehensive Income (Table)
3 Months Ended
Jun. 30, 2012
Other Comprehensive Income  
Schedule of Other Comprehensive Income (Loss) [Table Text Block]
              
   Three months ended June 30, Nine months ended June 30,
   2012 2011 2012 2011
Net income$ 14,503 $ 11,390 $ 40,877 $ 32,550
Other comprehensive income:           
 Foreign currency translation   (1,252)   (245)   (75)   575
  Total comprehensive income$ 13,251 $ 11,145 $ 40,802 $ 33,125