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Inventories - Summary (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Inventories [abstract]        
Raw materials $ 47,501 $ 48,140    
Finished goods 65,278 79,758 $ 61,888 $ 68,191
Others 11 204    
Current inventories $ 112,790 $ 128,102