PROPERTY, PLANT AND EQUIPMENT Rollforward (Details) - USD ($) $ in Thousands		3 Months Ended		6 Months Ended
		Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020		Jun. 30, 2019
Movement in Property, Plant and Equipment [Roll Forward]
Opening balance			$ 110,627	$ 113,901	[1]	$ 117,604
Additions (1)	[2]			7,064		10,200
Disposals				(23)		(2)
Depreciation		$ (7,972)	$ (8,154)	(15,899)		(16,380)
Foreign currency movements				2,665		$ 795
Ending balance	[1]	$ 102,378		$ 102,378

[1] ⁽¹⁾  Reflects property, plant and equipment, net.

[2] ⁽¹⁾  Includes assets acquired under finance leases. For additional information see Note 10, "Leases".