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Asset purchase (Details) (Carbon Anodes Production Facility [Member], USD $)
In Thousands, unless otherwise specified
Dec. 31, 2013
t
Jun. 11, 2012
Carbon Anodes Production Facility [Member]
   
Asset purchase [Line Items]    
Assets acquired   $ 12,500
Century Vlissingen Anode capacity (tonnes) 75,000  
Century Vlissingen Expected Anode capacity (tonnes) 150,000