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Inventories (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Disclosure Of Inventories [Abstract]        
Raw materials $ 46,836 $ 42,108    
Finished goods 61,888 68,191 $ 47,624 $ 75,875
Stocks held by third parties 0 1,308    
Others 195 147    
Current inventories $ 108,919 $ 111,754