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PROPERTY, PLANT AND EQUIPMENT Rollforward (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Movement in Property, Plant and Equipment [Roll Forward]    
Opening balance $ 117,604 [1] $ 119,349
Additions (1) 32,348 36,737
Disposals (29) (42)
Depreciation (33,536) (32,933)
Foreign currency movements (2,486) (5,507)
Ending balance [1] $ 113,901 $ 117,604
[1]
Reflects property, plant and equipment, net.