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Accounts Payable And Accrued Liabilities (Schedule Of Long-Term Accrued Liabilities) (Details) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2012
Jun. 30, 2012
Accounts Payable and Accrued Liabilities [Abstract]    
Amounts payable in respect of restructuring and other Special charges (note 16) $ 3,134 $ 1,803
Accruals relating to acquisitions 1,285 1,141
Other accrued liabilities 9,767 7,678
Asset retirement obligations 4,203 3,625
Accrued liabilities $ 18,389 $ 14,247