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Capital Structure
3 Months Ended
Sep. 30, 2018
Capital Structure [Abstract]  
Capital Structure

11. Capital structure

     The following table presents a reconciliation between the number of shares, net of treasury, presented in the unaudited condensed consolidated statement of changes in equity during the three months ended September 30, 2018 and 2017, respectively, and the number of shares, net of treasury, excluding non-vested equity shares that have not vested during the three months ended September 30, 2018 and 2017, respectively:

 
  September 30, September 30,
  2018 2017
 
Number of shares, net of treasury:    
Statement of changes in equity 56,833,925 56,927,696
Less: Non-vested equity shares that have not vested (Note 13) 860,817 1,007,182
Number of shares, net of treasury excluding non-vested    
equity shares that have not vested 55,973,108 55,920,514