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BASIS OF PRESENTATION AND SUMMARY OF ACCOUNTING POLICIES - Components of Inventory (Details) - USD ($)
$ in Thousands
Sep. 30, 2019
Dec. 31, 2018
Accounting Policies [Abstract]    
Finished goods $ 221,863 $ 165,969
Work in process 140 375
Raw materials 7,944 7,257
Total $ 229,947 $ 173,601