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Inventories - Summary (Details) - USD ($)
$ in Thousands
Sep. 30, 2018
Dec. 31, 2017
Sep. 30, 2017
Inventory Disclosure [Abstract]      
Raw materials and work in process $ 129,088 $ 101,690 $ 130,895
Finished goods 596,924 499,014 859,100
Inventories $ 726,012 $ 600,704 $ 989,995