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ACCOUNTS PAYABLE AND ACCRUED LIABILITIES - Schedule of Long-Term Accrued Liabilities (Details) - USD ($)
$ in Thousands
Dec. 31, 2021
Jun. 30, 2021
Accounts Payable and Accrued Liabilities [Abstract]    
Amounts payable in respect of restructuring and other special charges $ 3,337 $ 4,359
Other accrued liabilities 760 10,681
Asset retirement obligations 12,304 13,790
Total $ 16,401 $ 28,830