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Inventories - Summary (Details) - USD ($)
$ in Thousands
Mar. 31, 2018
Dec. 31, 2017
Mar. 31, 2017
Inventory Disclosure [Abstract]      
Raw materials and work in process $ 119,704 $ 101,690 $ 121,746
Finished goods 558,028 499,014 648,053
Inventories $ 677,732 $ 600,704 $ 769,799