Annual report pursuant to Section 13 and 15(d)

Asset Retirement Obligations - Roll-Forward (Details)

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Asset Retirement Obligations - Roll-Forward (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward]    
Balance at beginning of year $ 11,397 $ 9,292
Liabilities assumed 3,035 0
Liabilities incurred 398 50
Accretion expense 568 564
Sale of assets (6,773) 0
Revision to estimate (603) (129)
Effect of exchange rate changes (238) 1,620
Long term asset retirement obligation 7,784 11,397
Less current asset retirement obligation 329 0
Long term asset retirement obligation $ 7,455 $ 11,397