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Accounts Payable and Accrued Liabilities - Schedule Of Current Liabilities (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Jun. 30, 2017
Accounts Payable and Accrued Liabilities [Abstract]    
Accounts payable—trade $ 48,857 $ 43,699
Accrued salaries and commissions 94,880 121,958
Accrued liabilities 138,496 135,512
Accrued interest on Senior Notes 24,786 24,787
Amounts payable in respect of restructuring and other Special charges 7,114 13,728
Asset retirement obligations 3,875 2,436
Total $ 318,008 $ 342,120