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Inventories (Details Textual) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Inventories [Abstract]    
Current materials and supplies to be consumed in production process or rendering services $ 393,600 $ 347,100
Cost of inventories recognised as expense during period 88,174 $ 105,282
Products In Progress 104,295  
Finished product $ 204,686