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INVENTORIES - Activity in reserves for excess and obsolete inventory (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Inventory Disclosure [Abstract]    
Balance at beginning of period $ (168,105) $ (136,748)
Provision for excess and obsolete inventory (58,485) (35,165)
Disposal of unsaleable inventory 30,161 24,046
Business acquisitions, foreign currency and other 4,915 (20,238)
Balance at end of period $ (191,514) $ (168,105)