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Inventories (Details 2) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Inventories [Abstract]      
Beginning balance $ 88,174 $ 105,282 $ 96,284
Increase in Lower Value (5,404) (6,987) 7,845
Additional Provision Differences of Inventory (704) (123) 3,176
Increase / Decrease eventual differences and others 1,244 (6,262) 2,436
Provision Used (2,380) (3,736) (4,459)
Total changes (7,244) (17,108) 8,998
Final Balance $ 80,930 $ 88,174 $ 105,282