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Summary of Significant Accounting Policies and New Accounting Standards (Tables)
 3 Months Ended
Sep. 30, 2017
Accounting Policies [Abstract]  
Schedule of Net Income per Share and Weighted Average Shares
     
Three Months
  
For the Periods Ended September 30
    
2017
    
2016
  
Net income
       $ 15,892         $ 12,177    
Weighted average number of shares – basic
         39,944           39,408    
Dilutive effect of stock options
         349           498    
Weighted average number of shares – diluted
         40,293           39,906    
Net income per share      
basic
       $ 0.40         $ 0.31    
diluted
       $ 0.39         $ 0.31