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Inventories (Details) - USD ($)
$ in Thousands
Sep. 30, 2020
Dec. 31, 2019
Sep. 30, 2019
Inventory Disclosure [Abstract]      
Raw materials and work in process $ 113,248 $ 103,123 $ 107,562
Finished goods 550,391 392,381 594,005
Inventories $ 663,639 $ 495,504 $ 701,567