PROPERTY, PLANT AND EQUIPMENT Rollforward (Details) - USD ($) $ in Thousands		3 Months Ended
		Mar. 31, 2019		Mar. 31, 2018
Property, Plant and Equipment [Abstract]
Capital Lease Obligations Incurred		$ 2,200		$ 2,000
Movement in Property, Plant and Equipment [Roll Forward]
Opening balance		117,604	[1]	119,349
Additions (1)	[2]	3,923		7,014
Disposals		0		(1)
Depreciation		(8,226)		(8,387)
Foreign currency movements		2,954		$ (3,515)
Ending balance	[1]	$ 110,347

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

[2] (1) Includes assets acquired under finance leases of US$ 2.2 million and US$ 2.0 million for the three months ended March 31, 2019 and 2018, respectively.