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Share Capital, Option Plans and Share-Based Payments - Long-Term Incentive Plans (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2016
Dec. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Term of plan     3 years  
Issuance of treasury stock (in shares) 341,588 414,156 349,922  
Equity issuance costs paid     $ 18,127 $ 0
Unvested stock awards compensation cost, weighted average recognition period     2 years 2 months 8 days  
Long Term Incentive Plan        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Issuance of treasury stock (in shares) 339,922     414,156
Issuance of treasury stock $ 4,400      
Compensation cost related to unvested awards not yet recognized $ 19,000   $ 19,000  
Unvested stock awards compensation cost, weighted average recognition period     2 years 1 month