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Share-Based Compensation - Restricted Stock Activity (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 9 Months Ended 12 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Mar. 31, 2018
Mar. 31, 2017
Jun. 30, 2017
Dec. 31, 2016
Restricted Stock            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Compensation expense recognized     $ 200      
Number of Restricted Stock [Roll Forward]            
Shares Awarded, Exercised/Released (in shares)     (9,642)      
Shares Awarded, Cancelled/Forfeited (in shares)     (3,955)      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]            
Weighted Average Grant Date Fair Value, Exercised/Released (in US$ per share)     $ 31.12      
Weighted Average Grant Date Fair Value, Cancelled/Forfeited (in US$ per share)     $ 26.13      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Additional Disclosures [Abstract]            
Aggregate Intrinsic Value, Exercised/Released     $ 323      
Aggregate Intrinsic Value, Cancelled/Forfeited     $ 0      
Restricted Stock | Vested            
Number of Restricted Stock [Roll Forward]            
Shares Awarded, Ending balance (in shares) 14,958   14,958   15,445  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]            
Weighted Average Grant Date Fair Value, Beginning balance (in US$ per share)     $ 29.79      
Weighted Average Grant Date Fair Value, Ending balance (in US$ per share) $ 33.48   $ 33.48   $ 29.79  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Additional Disclosures [Abstract]            
Weighted Average Remaining Life, Beginning balance 1 year 8 months 12 days       11 months 12 days  
Weighted Average Remaining Life, Ending balance 1 year 8 months 12 days       11 months 12 days  
Aggregate Intrinsic Value, Beginning Balance     $ 467      
Aggregate Intrinsic Value, Ending Balance $ 452   $ 452   $ 467  
Vested and Expected to Vest, Outstanding, Number (in shares) 14,327   14,327      
Vested and Expected to Vest, Weighted Average Exercise Price (in US$ per share) $ 33.49   $ 33.49      
Vested and Expected to Vest, Weighted Average Remaining Life 1 year 8 months 12 days          
Vested and Expected to Vest, Aggregate Intrinsic Value $ 433   $ 433      
2017 Plan [Member] | Restricted Stock            
Number of Restricted Stock [Roll Forward]            
Restricted stock granted (in shares)     13,110      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]            
Restricted stock granted, weighted average grant date fair value (in US$ per share)     $ 33.88      
Share-based Compensation Arrangement by Share-based Payment Award, Equity instruments Other Than Options, Grants in Period, Weighted Average Remaining Contractual Term     1 year 8 months 12 days      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Additional Disclosures [Abstract]            
Aggregate Intrinsic Value, Granted     $ 444      
Omnibus Plan [Member] | Restricted Stock            
Number of Restricted Stock [Roll Forward]            
Restricted stock granted (in shares)       5,106    
Performance-Based Restricted Stock Units (PBRSUs)            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Compensation expense recognized 100   100 $ 0    
Unrecognized compensation cost related to restricted stock 1,000   1,000     $ 0
Restricted Stock            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Unrecognized compensation cost related to restricted stock 400   $ 400   $ 300  
General and Administrative Expense | Restricted Stock            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Compensation expense recognized $ 100 $ 15        
Director [Member]            
Number of Restricted Stock [Roll Forward]            
Restricted stock granted (in shares)     11,406      
Director [Member] | 2017 Plan [Member] | Restricted Stock            
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]            
Restricted stock granted, weighted average grant date fair value (in US$ per share)     $ 34.20      
Employee [Member]            
Number of Restricted Stock [Roll Forward]            
Restricted stock granted (in shares)     1,704      
Employee [Member] | 2017 Plan [Member] | Restricted Stock            
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]            
Restricted stock granted, weighted average grant date fair value (in US$ per share)     $ 31.70