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Inventories (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Inventories [abstract]        
Raw materials $ 48,140 $ 46,836    
Finished goods 79,758 61,888 $ 68,191 $ 47,624
Others 204 195    
Current inventories $ 128,102 $ 108,919 [1] $ 111,754 [1]  
[1] Prior periods have been recast to reflect the Company's change in accounting policy for Investment properties as in Note 33.