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Accounts Payable and Accrued Liabilities - Schedule of Long-Term Accrued Liabilities (Details) - USD ($)
$ in Thousands
Sep. 30, 2019
Jun. 30, 2019
Accounts Payable and Accrued Liabilities [Abstract]    
Amounts payable in respect of restructuring and other Special charges $ 0 $ 4,804
Other accrued liabilities 2,904 30,338
Asset retirement obligations 12,480 14,299
Total $ 15,384 $ 49,441