PROPERTY, PLANT AND EQUIPMENT Rollforward (Details) - USD ($) $ in Thousands	3 Months Ended			6 Months Ended
	Jun. 30, 2017		Jun. 30, 2016	Jun. 30, 2017		Jun. 30, 2016
Movement in Property, Plant and Equipment [Roll Forward]
Opening balance				$ 109,089	[1]	$ 108,522
Additions				12,604		10,043
Disposals				(71)		(49)
Depreciation	$ (8,293)		$ (7,627)	(16,052)		(14,912)
Foreign currency movements				(10,412)		(2,040)
Ending balance	$ 115,982	[1]	$ 105,644	$ 115,982	[1]	$ 105,644

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