PROPERTY, PLANT AND EQUIPMENT Rollforward (Details) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2018		Dec. 31, 2017
Movement in Property, Plant and Equipment [Roll Forward]
Opening balance		$ 119,349	[1]	$ 103,258
Additions		36,737		31,379
Disposals		(42)		(32)
Depreciation		(32,933)		(31,261)
Foreign currency movements		(5,507)		16,005
Ending balance	[1]	$ 117,604		$ 119,349

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