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Inventories (Narrative) (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Inventory Disclosure [Abstract]        
Inventory provisions $ 3,076 $ 4,033 $ 9,930 $ 13,439