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SIGNIFICANT ACCOUNTING POLICIES - Inventory (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
LIFO Method Related Items [Abstract]      
Increase in inventory reserve $ 565 $ 1,146 $ 1,800
Expense recorded 1,952 1,287 $ 1,800
Inventory, Net [Abstract]      
Raw materials 14,513 15,208  
Work-in-process 8,112 11,528  
Finished goods 12,320 12,782  
Supplies 504 583  
Inventory, net $ 35,449 $ 40,101