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Share-based Compensation - Performance-Based Shares (Details) - Performance-Based Shares - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
12 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Performance-Based Shares    
Share-based compensation awards vesting period 3 years  
Awards    
Non-vested at the beginning of the period (in shares) 20  
Granted (in shares) 52 47
Vested (in shares)   (27)
Non-vested at the end of the period (in shares) 72 20
Weighted Average Grant-date Fair Value    
Non-vested at the beginning of the period (in dollars per share) $ 25.58  
Granted (in dollars per share) 17.69 $ 25.58
Vested (in dollars per share)   25.58
Non-vested at the end of the period (in dollars per share) $ 19.92 $ 25.58
Aggregate Intrinsic Value    
Vested   $ 574