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Accounts Payable And Accrued Liabilities (Schedule Of Long-Term Accrued Liabilities) (Details) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2012
Jun. 30, 2011
Accounts Payable and Accrued Liabilities [Abstract]    
Amounts payable in respect of restructuring and other Special charges (note 16) $ 1,803 $ 652
Accruals relating to acquisitions 1,141 2,301
Other accrued liabilities 7,678 6,950
Asset retirement obligations 3,625 3,824
Accrued liabilities $ 14,247 $ 13,727