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Accounts Payable And Accrued Liabilities (Schedule Of Long-Term Accrued Liabilities) (Details) - USD ($)
$ in Thousands
Sep. 30, 2015
Jun. 30, 2015
Accounts Payable and Accrued Liabilities [Abstract]    
Amounts payable in respect of restructuring and other Special charges (note 17) $ 1,769 $ 2,034
Other accrued liabilities 20,881 24,826
Asset retirement obligations 6,929 7,822
Accrued liabilities $ 29,579 $ 34,682