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Inventories (Net components of inventories) (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Inventory Disclosure [Abstract]    
Finished goods $ 1,326,038 $ 1,127,573
Work in process 159,921 137,310
Raw materials 462,704 410,868
Total inventories $ 1,948,663 $ 1,675,751