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Share-Based Compensation - Performance-Based RSUs (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Jun. 30, 2018
Performance-Based Restricted Stock Units (PBRSUs)      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Employee Service Share-based Compensation, Nonvested Awards, Compensation Not yet Recognized, Share-based Awards Other than Options $ 800   $ 900
Number of PBRSUs [Roll Forward]      
Compensation expense recognized $ 82 $ 0  
Performance-Based Restricted Stock Units (PBRSUs)      
Number of PBRSUs [Roll Forward]      
Shares Awarded, Beginning balance (in shares) 35,732    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period 0    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period 0    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period 0    
Shares Awarded, Ending balance (in shares) 35,732    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value $ 31.70   $ 31.70
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value $ 0.00    
Aggregate Intrinsic Value, Granted $ 0    
Weighted Average Grant Date Fair Value, Exercised/Released (in US$ per share) $ 0.00    
Aggregate Intrinsic Value, Exercised/Released $ 0    
Weighted Average Grant Date Fair Value, Cancelled/Forfeited (in US$ per share) $ 0.00    
Aggregate Intrinsic Value, Cancelled/Forfeited $ 0    
Weighted Average Remaining Life, Ending balance 2 years 1 month 6 days 3 years 4 months 24 days  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Aggregate Intrinsic Value $ 943   $ 1,092
Vested and Expected to Vest, Outstanding, Number (in units) 32,197    
Vested and Expected to Vest, Weighted Average Exercise Price (in US$ per share) $ 31.70    
Vested and Expected to Vest, Weighted Average Remaining Life 2 years 1 month 6 days    
Vested and Expected to Vest, Aggregate Intrinsic Value $ 850    
2017 Plan [Member] | Performance-Based Restricted Stock Units (PBRSUs)      
Number of PBRSUs [Roll Forward]      
Employee Service Share-based Compensation, Nonvested Awards, Weighted Average Remaining Amortization Period 2 years 1 month 6 days