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Inventories - Summary (Details) - USD ($)
$ in Thousands
Jun. 30, 2019
Dec. 31, 2018
Jun. 30, 2018
Inventory Disclosure [Abstract]      
Raw materials and work in process $ 129,937 $ 115,966 $ 130,093
Finished goods 592,457 426,923 585,195
Inventories $ 722,394 $ 542,889 $ 715,288