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Capital Structure
 6 Months Ended
Dec. 31, 2016
Capital Stucture [Abstract]  
Capital Structure

11. Capital structure

     The following table presents reconciliation between the number of shares, net of treasury, presented in the unaudited condensed consolidated statement of changes in equity during the six months ended December 31, 2016 and 2015, respectively, and the number of shares, net of treasury, excluding non-vested equity shares that have not vested during the six months ended December 31, 2016 and 2015, respectively:

  December 31,   December 31  
  2016   2015  
 
Number of shares, net of treasury:        
Statement of changes in equity 52,521,345   47,322,702  
Less: Non-vested equity shares that have not vested (Note 13) (904,356 ) (589,447 )
Number of shares, net of treasury excluding non-vested        
equity shares that have not vested 51,616,989   46,733,255  

     Sale of common stock

     On October 6, 2016, the Company entered into stock purchase agreements with two investors under which the Company agreed to sell each of the investors 2.5 million shares of the its common stock at a price of $9.00 per share, for aggregate gross proceeds to the Company of $45.0 million. On November 16, 2016, the parties amended each stock purchase agreement to have the closing date occur on the earlier of (i) a date to be specified by the Company in writing to the respective investor which date shall be no earlier than January 23, 2017, and no later than February 28, 2017; provided however, that such date must be at least five business days after such notice is delivered; and (ii) a date to be specified by the respective Investor in writing to the Company which date shall be no earlier than January 23, 2017, and no later than February 28, 2017; provided however, that such date must be at least five business days after such notice is delivered. The sale of the shares will be registered under the Securities Act of 1933, as amended, pursuant to the Company's shelf registration statement on Form S-3. Each of the investors will be contractually restricted from selling or otherwise disposing of the purchased shares for a period of six months after the date of issuance.

     Common stock repurchases

          Executed under share repurchase authorizations

     In February 2016, the Company's Board of Directors approved the replenishment of its share repurchase authorization to repurchase up to an aggregate of $100 million of common stock. The authorization has no expiration date. On June 29, 2016, the Company adopted a Rule 10b5-1 trading plan for the purpose of repurchasing approximately $50 million of its common stock, which was included within the original share repurchase authorization. The Company did not repurchase any of its shares during the three months ended December 31, 2016. During the three months ended December 31, 2015, the Company repurchased 749,213 shares for approximately $11.2 million under its share repurchase authorization. During the six months ended December 31, 2016 and 2015, the Company repurchased 3,137,609 shares for approximately $31.6 million and 749,213 shares for approximately $11.2 million, respectively, under its share repurchase authorizations.

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