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Accounts Payable and Accrued Liabilities - Schedule Of Long-Term Accrued Liabilities (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Jun. 30, 2017
Accounts Payable and Accrued Liabilities [Abstract]    
Amounts payable in respect of restructuring and other Special charges $ 2,425 $ 2,686
Other accrued liabilities 33,804 36,702
Asset retirement obligations 11,150 10,950
Total $ 47,379 $ 50,338