PROPERTY, PLANT AND EQUIPMENT Rollforward (Details) - USD ($) $ in Thousands		3 Months Ended			6 Months Ended
		Jun. 30, 2018		Jun. 30, 2017	Jun. 30, 2018		Jun. 30, 2017
Property, Plant and Equipment [Abstract]
Capital Lease Obligations Incurred					$ 4,000		$ 4,000
Movement in Property, Plant and Equipment [Roll Forward]
Opening balance					103,648	[1]	89,080
Additions (1)	[2]				11,646		10,409
Disposals					(23)		(84)
Depreciation		$ (7,548)		$ (6,450)	(14,914)		(12,409)
Foreign currency movements					3,576		(8,663)
Ending balance		$ 96,781	[1]	$ 95,659	$ 96,781	[1]	$ 95,659

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

[2] (1) Includes assets acquired under capital leases of US$ 4.0 million and US$ 4.0 million for the six months ended June 30, 2018 and 2017, respectively.