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Shareholders' Equity and Share-based Compensation - Restricted Stock Activity (Details) - USD ($)
1 Months Ended 3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Sep. 30, 2018
Jun. 30, 2018
Sep. 30, 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)     3 years    
Allocated share-based compensation expense     $ 3,129,000   $ 2,008,000
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, 2018     919,023    
Granted     39,676    
Vested     (35,566)    
Forfeited     (5,375)    
Nonvested at September 30, 2018     917,758 919,023  
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, 2018     $ 15.14    
Granted     14.24    
Vested     14.64    
Forfeited     11.97    
Nonvested at September 30, 2018     $ 15.14 $ 15.14  
Weighted Average Remaining Recognition Period (Years)     1 year 5 months 16 days 1 year 7 months 13 days  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Aggregate Intrinsic Value, Nonvested     $ 10,673,526 $ 13,086,888  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested and Expected to Vest, Outstanding, Number     839,391    
Employee Service Share-based Compensation, Vested and Expected to Vest Awards, Total Compensation Cost Not Yet Recognized, Period for Recognition     1 year 4 months 21 days    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested and Expected to Vest, Intrinsic Value     $ 9,762,119    
Market-based Restricted Stock Units (MSU)          
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]          
Nonvested at June 30, 2018     0    
Granted     1,310,000    
Vested     0    
Forfeited     0    
Nonvested at September 30, 2018     1,310,000 0  
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, 2018     $ 0.00    
Granted     5.17    
Vested     0.00    
Forfeited     0.00    
Nonvested at September 30, 2018     $ 5.17 $ 0.00  
Weighted Average Remaining Recognition Period (Years)     5 years 8 months 16 days 0 years  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested and Expected to Vest, Outstanding, Number     920,140    
Employee Service Share-based Compensation, Vested and Expected to Vest Awards, Total Compensation Cost Not Yet Recognized, Period for Recognition     5 years 7 months 17 days    
Allocated share-based compensation expense     $ 200,000    
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]          
Nonvested at June 30, 2018     422,300    
Granted 298,000 170,000 0    
Vested     0    
Forfeited     (500)    
Nonvested at September 30, 2018     421,800 422,300  
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, 2018     $ 16.63    
Granted     0.00    
Vested     0.00    
Forfeited     16.22    
Nonvested at September 30, 2018     $ 16.63 $ 16.63  
Weighted Average Remaining Recognition Period (Years)     1 year 9 months 18 days 2 years 22 days  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Aggregate Intrinsic Value, Nonvested     $ 4,905,534 $ 6,013,552  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested and Expected to Vest, Outstanding, Number     377,861    
Employee Service Share-based Compensation, Vested and Expected to Vest Awards, Total Compensation Cost Not Yet Recognized, Period for Recognition     1 year 8 months 23 days    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested and Expected to Vest, Intrinsic Value     $ 4,394,528    
Allocated share-based compensation expense     $ 600,000   $ 200,000