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Prepaid land lease payments (Details) (Land use right, USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Land use right
     
Prepaid land lease payments      
Prepaid land lease payments $ 12,238 $ 11,891  
Accumulated amortization 1,290 979  
Net book value 10,948 10,912  
Amortization expense $ 311 $ 299 $ 285