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Inventories (Details) - USD ($)
$ in Thousands
Jun. 30, 2020
Dec. 31, 2019
Jun. 30, 2019
Inventory Disclosure [Abstract]      
Raw materials and work in process $ 139,256 $ 103,123 $ 129,937
Finished goods 563,336 392,381 592,457
Inventories $ 702,592 $ 495,504 $ 722,394