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Accounts Payable and Accrued Liabilities - Schedule of Long-Term Accrued Liabilities (Details) - USD ($)
$ in Thousands
Jun. 30, 2019
Jun. 30, 2018
Accounts Payable and Accrued Liabilities [Abstract]    
Amounts payable in respect of restructuring and other Special charges $ 4,804 $ 4,362
Other accrued liabilities 30,338 35,874
Asset retirement obligations 14,299 12,591
Total $ 49,441 $ 52,827