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Accounts Payable and Accrued Liabilities - Schedule of Current Liabilities (Details) - USD ($)
$ in Thousands
Sep. 30, 2019
Jun. 30, 2019
Accounts Payable and Accrued Liabilities [Abstract]    
Accounts payable—trade $ 36,213 $ 46,323
Accrued salaries and commissions 90,978 131,430
Accrued liabilities 102,152 117,551
Accrued interest on Senior Notes 26,021 24,786
Amounts payable in respect of restructuring and other Special charges 2,225 8,153
Asset retirement obligations 3,280 1,660
Total $ 260,869 $ 329,903