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Inventories - Summary (Details) - USD ($)
$ in Thousands
Mar. 31, 2020
Dec. 31, 2019
Mar. 31, 2019
Inventory Disclosure [Abstract]      
Raw materials and work in process $ 107,880 $ 103,123 $ 118,143
Finished goods 452,765 392,381 497,685
Inventories $ 560,645 $ 495,504 $ 615,828