Annual report pursuant to Section 13 and 15(d)

Asset Retirement Obligations (Details)

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Asset Retirement Obligations (Details) - USD ($)
$ in Thousands
12 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Asset Retirement Obligation Disclosure [Abstract]    
Ownership percentage sold 40.00%  
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward]    
Fiscal year opening balance $ 2,873 $ 6,879
Liabilities assumed 0 7
Accretion expense 171 367
Sale of assets (346) (4,457)
Revision to estimate 0 0
Effect of exchange rate changes (51) 77
Fiscal year closing balance 2,647 2,873
Less current asset retirement obligations 0 397
Long term asset retirement obligations $ 2,647 $ 2,476