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Summary of Significant Accounting Policies and New Accounting Standards (Tables)
 3 Months Ended
Sep. 30, 2016
Accounting Policies [Abstract]  
Schedule of Net Income per Share and Weighted Average Shares
     
Three Months
  
For the Periods Ended September 30
    
2016
    
2015
  
Net income
       $ 12,177         $ 18,753    
Weighted average number of shares – basic
         39,408           39,092    
Dilutive effect of stock options
         498           920    
Weighted average number of shares – diluted
         39,906           40,012    
Net income per share                          
basic
       $ 0.31         $ 0.48    
diluted
       $ 0.31         $ 0.47