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Accounts Payable And Accrued Liabilities (Narrative) (Details) (USD $)
In Millions, unless otherwise specified
6 Months Ended 12 Months Ended
Dec. 31, 2011
Jun. 30, 2011
Accounts Payable And Accrued Liabilities [Abstract]    
Present value of asset retirement obligation $ 4.7 $ 6.1
Undiscounted value of asset retirement obligation $ 5.2 $ 6.5