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Inventories (Details) - USD ($)
$ in Thousands
Mar. 31, 2018
Dec. 31, 2017
Inventory Disclosure [Abstract]    
Finished goods $ 1,403,472 $ 1,326,038
Work in process 167,717 159,921
Raw materials 473,773 462,704
Total inventories $ 2,044,962 $ 1,948,663