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Shareholders' Equity and Share-based Compensation - Shares Repurchase (Details) - USD ($)
 3 Months Ended 9 Months Ended 89 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Mar. 31, 2018
Mar. 31, 2017
Mar. 31, 2018
Class of Stock [Line Items]          
Share repurchase program, authorized amount (USD in Millions) $ 30,000,000   $ 30,000,000   $ 30,000,000
Shares Repurchase Program Remaining Balance 18,000,000   $ 18,000,000   $ 18,000,000
Repurchase of common shares under shares repurchase program     748,936   6,472,029
Repurchase of common shares under shares repurchase program     $ (12,016,000)   $ (62,800,000)
Treasury stock acquired, average price per share (in dollars per share)     $ 16.01   $ 9.70
Treasury Stock, Shares, Retired     0    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross     0    
Allocated share-based compensation expense 2,460,000 $ 1,715,000 $ 8,477,000 $ 4,585,000  
Treasury Stock Reissued          
Class of Stock [Line Items]          
Treasury stock acquired, average price per share (in dollars per share)         $ 10.50
Stock Issued During Period, Shares, Share-based Compensation, Net of Forfeitures (in shares)         132,353
Treasury Stock Reissued, Average Price Per Share         $ 5.83
Performance Based Restricted Stock Units (PRSUs) Member [Member]          
Class of Stock [Line Items]          
Allocated share-based compensation expense $ 400,000 $ 68,000 $ 1,100,000 $ 68,000