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Accounts Payable And Accrued Liabilities - Schedule Of Long-Term Accrued Liabilities (Details) - USD ($)
$ in Thousands
Dec. 31, 2016
Jun. 30, 2016
Accounts Payable and Accrued Liabilities [Abstract]    
Amounts payable in respect of restructuring and other Special charges $ 1,874 $ 3,986
Other accrued liabilities 19,650 19,138
Asset retirement obligations 8,785 6,724
Total $ 30,309 $ 29,848