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Inventories (Narrative) (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Inventory Disclosure [Abstract]        
Inventory provisions $ 11,514 $ 7,303 $ 25,955 $ 19,952