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Accounts Payable And Accrued Liabilities (Schedule Of Long-Term Accrued Liabilities) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Jun. 30, 2012
Accounts Payable and Accrued Liabilities [Abstract]
Amounts payable in respect of restructuring and other Special charges (note 16)	$ 2,924	$ 1,803
Other accrued liabilities	11,264	8,819
Asset retirement obligations	4,956	3,625
Accrued liabilities	$ 19,144	$ 14,247

Carrying amount as of the balance sheet date of known and estimated costs associated with exit from or disposal of business activities or restructurings pursuant to a duly authorized plan, which are expected to be paid after one year or beyond the next operating cycle, if longer. Costs of such activities include those for one-time termination benefits, termination of an operating lease or other contract, consolidating or closing facilities, and relocating employees, and costs associated with an ongoing benefit arrangement, but excludes costs associated with the retirement of a long-lived asset.

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