RESTRUCTURING - Schedule of Restructuring Liability (Details) $ in Thousands	9 Months Ended
	Sep. 30, 2018 USD ($)
Restructuring Liability Rollforward [Roll Forward]
Restructuring reserve, beginning balance	$ 4,121
Charges payable in cash	(81)
Cash payments	(2,549)
Foreign currency translation	(69)
Restructuring reserve, ending balance	1,422
Employee Severance and Benefit Costs
Restructuring Liability Rollforward [Roll Forward]
Restructuring reserve, beginning balance	3,817
Charges payable in cash	(298)
Cash payments	(2,028)
Foreign currency translation	(69)
Restructuring reserve, ending balance	1,422
Other Exit Costs
Restructuring Liability Rollforward [Roll Forward]
Restructuring reserve, beginning balance	304
Charges payable in cash	217
Cash payments	(521)
Foreign currency translation	0
Restructuring reserve, ending balance	$ 0