Quarterly report pursuant to Section 13 or 15(d)

Asset Retirement Obligations (Roll-Forward) (Details)

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Asset Retirement Obligations (Roll-Forward) (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 9 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Mar. 31, 2013
Jun. 30, 2012
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward]        
Balance at beginning of period     $ 7,784  
Asset Retirement Obligation, Liabilities Incurred 3 0 3  
Accretion expense     329  
Revision to estimate     (306)  
Effect of exchange rate changes     113  
Balance at end of period 7,923   7,923  
Less current asset retirement obligation 340   340 329
Long term asset retirement obligation $ 7,583   $ 7,583 $ 7,455