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INVENTORIES - Components of Inventory, Net of Reserves (FY) (Details) - USD ($)
$ in Thousands
Sep. 30, 2018
Dec. 31, 2017
Sep. 30, 2017
Dec. 31, 2016
Inventory Disclosure [Abstract]        
Raw materials $ 465,925 $ 378,481 $ 378,481 $ 331,465
Work-in-progress 173,624 167,390 167,390 145,462
Finished goods 226,656 196,763 196,763 181,583
Total inventories $ 866,205 $ 742,634 $ 742,634 $ 658,510