RESTRUCTURING CHARGES (Restructuring Reserve) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Restructuring Reserve [Roll Forward]
Balance at December 31, 2017	$ 1,097
Restructuring	1,352	$ 1,436
Cash expenditures	1,186
Foreign currency translation adjustment	(11)
Balance at March 31, 2018	1,274
Employee termination costs
Restructuring Reserve [Roll Forward]
Restructuring	404
Inventory Impairment
Restructuring Reserve [Roll Forward]
Restructuring	0
Consulting fees
Restructuring Reserve [Roll Forward]
Restructuring	902
Facility related costs
Restructuring Reserve [Roll Forward]
Restructuring	11
Other related costs
Restructuring Reserve [Roll Forward]
Restructuring	$ 35