Annual report pursuant to Section 13 and 15(d)

Discontinued Operations - Summary of Asset Retirement Obligations Activity Included in Liabilities Held For Sale (Details)

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Discontinued Operations - Summary of Asset Retirement Obligations Activity Included in Liabilities Held For Sale (Details) - USD ($)
$ in Thousands
12 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward]    
Fiscal year opening balance $ 0 $ 397
Fiscal year closing balance 0 0
Less current asset retirement obligations 0 0
Long-term asset retirement obligations 0 0
Liabilities Held For Sale    
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward]    
Fiscal year opening balance 2,647 2,476
Accretion expense 171 171
Fiscal year closing balance 2,818 2,647
Less current asset retirement obligations 0 0
Long-term asset retirement obligations $ 2,818 $ 2,647