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Inventories (Details) - USD ($)
$ in Thousands
Mar. 31, 2019
Dec. 31, 2018
Inventory Disclosure [Abstract]    
Raw materials $ 822,178 $ 465,873
Work-in-progress 435,565 154,485
Finished goods 689,477 224,528
Total inventories $ 1,947,220 $ 844,886