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Shareholders' Equity and Share-based Compensation - Restricted Stock Activity (Details) - USD ($)
3 Months Ended 9 Months Ended
Mar. 31, 2018
Jun. 30, 2017
Mar. 31, 2017
Mar. 31, 2018
Mar. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Roll Forward]          
Weighted Average Remaining Recognition Period (Years) 1 year 9 months 18 days        
Allocated share-based compensation expense $ 2,460,000   $ 1,715,000 $ 8,477,000 $ 4,585,000
Restricted Stock          
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]          
Nonvested at June 30, 2017       1,144,865  
Granted       745,071  
Vested       (473,657)  
Forfeited       (63,403)  
Nonvested at March 31, 2018 1,352,876 1,144,865   1,352,876  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Roll Forward]          
Nonvested at June 30, 2017       $ 14.11  
Granted       16.40  
Vested       13.58  
Forfeited       14.04  
Nonvested at March 31, 2018 $ 15.56 $ 14.11   $ 15.56  
Weighted Average Remaining Recognition Period (Years) 1 year 11 months 12 days 1 year 9 months 4 days      
RSUs Nonvested Aggregate Intrinsic Value $ 20,901,934 $ 19,084,900   $ 20,901,934  
RSUs vested and expected to vest, Outstanding (in shares) 1,177,238     1,177,238  
RSUs vested and expected to vest, Weighted Average Remaining Recognition Period (in years) 1 year 10 months 13 days        
RSUs vested and expected to vest, Aggregate Intrinsic Value $ 18,188,334     $ 18,188,334  
Performance Based Restricted Stock Units (PRSUs) Member [Member]          
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]          
Granted 298,000   170,000    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Roll Forward]          
Allocated share-based compensation expense $ 400,000   $ 68,000 $ 1,100,000 $ 68,000