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
Sep. 30, 2012
Jun. 30, 2012
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward]    
Balance at beginning of period $ 7,784  
Accretion expense 111  
Revision to estimate (306)  
Effect of exchange rate changes 99  
Balance at end of period 7,688  
Less current asset retirement obligation 339 329
Long term asset retirement obligation $ 7,349 $ 7,455