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 15 Months Ended
Sep. 30, 2013
Sep. 30, 2013
Jun. 30, 2013
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward]      
Balance at beginning of period $ 6,879    
Liabilities incurred   7  
Accretion expense 110    
Effect of exchange rate changes 91    
Balance at end of period 7,087 7,087  
Less current asset retirement obligation 483 483 476
Long term asset retirement obligation $ 6,604 $ 6,604 $ 6,403