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Share-Based Compensation - Performance-Based RSUs (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 6 Months Ended 12 Months Ended
Dec. 31, 2017
Dec. 31, 2017
Dec. 31, 2016
Jun. 30, 2017
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 $ 1,100 $ 1,100 $ 0  
Number of PBRSUs [Roll Forward]        
Compensation expense recognized $ 0 $ 0 $ 0  
Performance-Based Restricted Stock Units (PBRSUs)        
Number of PBRSUs [Roll Forward]        
Shares Awarded, Beginning balance (in shares)   0    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period   37,414 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) 37,414 37,414   0
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   $ 0.00
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value   $ 31.70    
Aggregate Intrinsic Value, Granted   $ 1,186    
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 10 months 10 days    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Aggregate Intrinsic Value $ 1,203 $ 1,203   $ 0
Vested and Expected to Vest, Outstanding, Number (in units) 32,495 32,495    
Vested and Expected to Vest, Weighted Average Exercise Price (in US$ per share) $ 31.70 $ 31.70    
Vested and Expected to Vest, Weighted Average Remaining Life   2 years 10 months 10 days    
Vested and Expected to Vest, Aggregate Intrinsic Value $ 1,045 $ 1,045    
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period   3 years    
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 10 months 10 days