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Accounts Payable And Accrued Liabilities - Schedule Of Long-Term Accrued Liabilities (Details) - USD ($)
$ in Thousands
Sep. 30, 2016
Jun. 30, 2016
Accounts Payable and Accrued Liabilities [Abstract]    
Amounts payable in respect of restructuring and other Special charges $ 3,752 $ 3,986
Other accrued liabilities 19,338 19,138
Asset retirement obligations 8,391 6,724
Total $ 31,481 $ 29,848