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Inventories (Details 2) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Inventories [Abstract]      
Opening balance $ 105,282 $ 96,284 $ 81,295
Increase in lower value (6,987) 7,845 19,515
Additional provisions (123) 3,176 573
Increase (decrease) in existing provisions (6,262) 2,436 (178)
Provision used, other provisions (3,736) (139,506) (4,921)
Total changes (17,108) 8,998 14,989
Final Balance $ 88,174 $ 105,282 $ 96,284