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Share-Based Compensation - Performance-Based Shares (Details) - Performance-Based Shares
shares in Thousands
3 Months Ended
Sep. 30, 2018
$ / shares
shares
Awards  
Non-vested at the beginning of the period (in shares) | shares 20
Granted (in shares) | shares 52
Non-vested at the end of the period (in shares) | shares 72
Weighted Average Grant-date Fair Value  
Non-vested at the beginning of the period (in dollars per share) | $ / shares $ 25.58
Granted (in dollars per share) | $ / shares 17.69
Non-vested at the end of the period (in dollars per share) | $ / shares $ 19.92