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Accounts Payable And Accrued Liabilities (Schedule Of Long-Term Accrued Liabilities) (Details) - USD ($)
$ in Thousands
Jun. 30, 2016
Jun. 30, 2015
Accounts Payable and Accrued Liabilities [Abstract]    
Amounts payable in respect of restructuring and other Special charges $ 3,986 $ 2,034
Other accrued liabilities 19,138 24,826
Asset retirement obligations 6,724 7,822
Total $ 29,848 $ 34,682