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Shareholders' Equity and Share-based Compensation - Shares Repurchase (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 95 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Class of Stock [Line Items]      
Share repurchase program, authorized amount (USD in Millions) $ 30,000   $ 30,000
Shares Repurchase Program Remaining Balance $ 13,400   $ 13,400
Repurchase of common shares under shares repurchase program 111,509   6,784,648
Treasury Stock, Value, Acquired, Cost Method Less Handling Fees $ 1,500    
Repurchase of common shares under shares repurchase program $ (1,501)   $ (67,300)
Treasury stock acquired, average price per share (in dollars per share) $ 13.43   $ 9.92
Treasury Stock, Shares, Retired 0    
Allocated share-based compensation expense $ 3,129 $ 2,008  
Treasury Stock Reissued      
Class of Stock [Line Items]      
Treasury stock acquired, average price per share (in dollars per share)     $ 10.48
Stock Issued During Period, Shares, Share-based Compensation, Net of Forfeitures (in shares)     133,728
Treasury Stock Reissued, Average Price Per Share     $ 5.77
Performance Based Restricted Stock Units (PRSUs) Member [Member]      
Class of Stock [Line Items]      
Allocated share-based compensation expense $ 600 $ 200