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Accounts Payable And Accrued Liabilities (Narrative) (Details) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2012
Jun. 30, 2012
Accounts Payable and Accrued Liabilities [Abstract]    
Present value of asset retirement obligation $ 5.4 $ 4.3
Undiscounted value of asset retirement obligation $ 5.8 $ 4.8