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Inventories (Details) - USD ($)
$ in Thousands
Sep. 30, 2017
Dec. 31, 2016
Inventory Disclosure [Abstract]    
Finished goods $ 1,310,957 $ 1,127,573
Work in process 151,906 137,310
Raw materials 448,166 410,868
Total inventories $ 1,911,029 $ 1,675,751